Sprouto/rdsap10 huggingface dataset:
7 CONSERVATORY
9 WINDOWS AND DOORS
9.1 Draught proofing
All external doors and openable windows per building part should be examined for the presence of draughtproofing.
Refer to RdSAP Conventions if the state of draughtproofing cannot be determined.
If the state of the draught proofing cannot be determined then take triple, double or secondary glazed as being draughtproofed, and single glazed windows and doors as not draughtproofed.
Include glazing in a non-separated conservatory.
Insulated doors are assumed to be draught proofed, uninsulated doors are assumed to not be draught proofed.  
The percentage draught proofed is calculated as [(number of draughtproofed openable windows \& doors) divided by (total number of openable windows \& doors)] x 100.
7 CONSERVATORY
9 WINDOWS AND DOORS
9.2 Window U-values and g-values
Actual U-values, g-values and frame factors (FF) can be used if known, subject to a documentary evidence.
Default U-values and g-values for windows are in Table 24 : Window characteristics; the values can be overwritten only if documentary evidence is provided, which can be either a Window Energy Rating certificate (as defined by BFRC), modelled values or published manufacturer's data.  
The U-value is for a whole window, not a centre pane; it includes the glass AND the frame.  
Refer to RdSAP Conventions for definition of "glazing age" and "glazing gap".
Table 24 : Window characteristics  
| Glazing | Installed | Glazing gap between panes of glass | U-value (PVC or wooden frame) | $\begin{gathered} \text { U- } \\ \text { value } \\ \text { (metal } \\ \text { frame) } \end{gathered}$ | $\begin{gathered} \text { U- } \\ \text { value }^{* *} \\ \text { (roof } \\ \text { window) } \end{gathered}$ | $\begin{gathered} \text { g- } \\ \text { value } \end{gathered}$ |
7 CONSERVATORY
9 WINDOWS AND DOORS
9.2 Window U-values and g-values
| :--: | :--: | :--: | :--: | :--: | :--: | :--: |
| Single | Any period | - | 4.8 | 5.7 | 5.3 | 0.85 |
| Double glazed* | England/Wales: before 2002, <br> Scotland: before 2003 <br> N. Ireland: before 2006 | 6 mm | 3.1 | 3.7 | 3.4 | 0.76 |
|  |  | 12 mm | 2.8 | 3.4 | 3.1 |  |
|  |  | 16 mm or more | 2.7 | 3.3 | 3.0 |  |
| Triple glazed | England/Wales: before 2002, <br> Scotland: before 2003 <br> N. Ireland: before 2006 | 6 mm | 2.4 | 2.9 | 2.6 | 0.68 |
|  |  | 12 mm | 2.1 | 2.6 | 2.3 |  |
|  |  | 16 mm or more | 2.0 | 2.5 | 2.2 |  |
| Double or triple glazed | England/Wales: 2002 or later, Scotland: 2003 or later N. Ireland: 2006 or later | any | 2.0 | 2.2 | 2.3 | 0.72 |
| Double or triple glazed | England/Wales: 2022 or later <br> Scotland: 2023 or later <br> NI: 2022 or later | any | 1.4 | - | 1.6 | 0.72 |
| Secondary glazing | Any period | 16 mm or more Normal emissivity | 2.9 | - | - | 0.85 |
|  |  | 16 mm or more Low emissivity | 2.2 |  |  |  |
7 CONSERVATORY
9 WINDOWS AND DOORS
9.2 Window U-values and g-values
| Secondary glazing | Any period | 16 mm or more Normal emissivity | 2.9 | - | - | 0.85 |
|  |  | 16 mm or more Low emissivity | 2.2 |  |  |  |
| Any glazingknown data | Any period | Any | As provided |  |  |  |  
* Use this row for conservatories and for other double or triple glazing whose installation date is unknown.
** Roof pitch $45^{\circ}$ (unless horizontal), wooden or PVC.
Frame factor is 0.7 for wooden or PVC frame; 0.8 for metal frame (not applied if data source is BFRC)
For curtains and blinds no additional adjustment is required as curtains and blinds already accounted in formula (2) $\S 3.2$ in SAP10.2 by adding resistance $\mathrm{R}=0.04 \mathrm{~m}^{2} \mathrm{~K} / \mathrm{W}$, however:
- If a window is fitted with uninsulated shutters use $\mathrm{R}=0.13 \mathrm{~m}^{2} \mathrm{~K} / \mathrm{W}$ in formula (2) $\S 3.2$ in SAP10.2
7 CONSERVATORY
9 WINDOWS AND DOORS
9.2 Window U-values and g-values
- If a window is fitted with uninsulated shutters use $\mathrm{R}=0.13 \mathrm{~m}^{2} \mathrm{~K} / \mathrm{W}$ in formula (2) $\S 3.2$ in SAP10.2
- If a window is fitted with insulated shutters use $\mathrm{R}=0.16 \mathrm{~m}^{2} \mathrm{~K} / \mathrm{W}$ in formula (2) $\S 3.2$ in SAP10.2  
Table 25 applies to a non-separated conservatory.
Table 25 : Default U-values for non-separated conservatory  
| Glazing | Age <br> band | Frame (FF) | U-value of <br> window | U-value of <br> roof window | g- <br> value |
| :-- | :-- | :-- | :--: | :--: | :--: |
| Single | Any | Wood/PVC (FF=0.7) | 4.8 | 5.3 | 0.85 |
| Double <br> (6 mm gap) | Any | Wood/PVC (FF=0.7) | 3.1 | 3.4 | 0.76 |
| Triple <br> (6 mm gaps) | Any | Wood/PVC (FF=0.7) | 2.4 | 2.6 | 0.68 |
| U-values are adjusted for curtains (section 3.2 of the SAP 10.2 specification). |  |  |  |  |  |
7 CONSERVATORY
9 WINDOWS AND DOORS
9.2 Window U-values and g-values
| Triple <br> (6 mm gaps) | Any | Wood/PVC (FF=0.7) | 2.4 | 2.6 | 0.68 |
| U-values are adjusted for curtains (section 3.2 of the SAP 10.2 specification). |  |  |  |  |  |  
The orientation of windows in a conservatory is not recorded, thus solar gains are calculated using the default solar flux (East/West orientation, with $20^{\circ}$ pitch for roof windows) in all cases.
9.3 Door U-values
The RdSAP data set contains the total number of external doors and the number of those doors that are insulated. The U-value of insulated doors is part of the data set; the U-value of other external doors is taken from Table 26 : Default U-values for doors.  
Table 26 : Default U-values for doors  
|  Door opens to | Age band | Door U-value, W/m²K  |
| --- | --- | --- |
|  Outside | A to J | U-value $=3.0 \mathrm{~W} /\left(\mathrm{m}^{2} \cdot \mathrm{~K}\right)$  |
|   | K | U-value $=2.0 \mathrm{~W} /\left(\mathrm{m}^{2} \cdot \mathrm{~K}\right)$  |
|   | L | E/W and N.I: U-value $=1.8$
Scotland: U-value $=1.6 \mathrm{~W} /\left(\mathrm{m}^{2} \cdot \mathrm{~K}\right)$  |
|   | M | $1.4 \mathrm{~W} /\left(\mathrm{m}^{2} \cdot \mathrm{~K}\right)$  |
|  Unheated corridor or stairwell | any | U-value $=1.4 \mathrm{~W} /\left(\mathrm{m}^{2} \cdot \mathrm{~K}\right)$  |
|  Heated corridor or stairwell | any | (omitted from data collection)  |
9.3 Door U-values
|  Unheated corridor or stairwell | any | U-value $=1.4 \mathrm{~W} /\left(\mathrm{m}^{2} \cdot \mathrm{~K}\right)$  |
|  Heated corridor or stairwell | any | (omitted from data collection)  |  
A multiple door should be recorded as such, e.g. a double door should be counted as 2 doors (or measured). A door is counted as insulated only if documentary evidence is provided, which must include U-value or manufacturer reference enabling the assessor to ascertain the U-value from the manufacturer.  
If there is more than one insulated door and they have different U-values, use the average U-value.  
An external door is a door that forms part of the heat loss perimeter of the dwelling (including being covered by a separated conservatory)  
If there is more than one insulated door and they have different U-values, enter the average U-value. See RdSAP Conventions for treatment of highly glazed doors.
10 ROOM COUNT AND LIVING AREA
10.1 Room count (habitable room count)
The room count is equal to the number of habitable rooms ${ }^{9}$.
10 ROOM COUNT AND LIVING AREA
10.1.1 Habitable room count
Habitable rooms include any living room, sitting room, dining room, kitchen/diner, bedroom, study and similar; and also a non-separated conservatory.  
Excluded from the room count are: any room used solely as a kitchen, utility room, bathroom, cloakroom, en-suite bathroom/shower room/toilet or similar; any hallway, stairs or landing; and also any room without access to natural daylight.  
For a kitchen to be a kitchen/diner it must have space for a table and 4 chairs.
A lounge/dining room where the door was temporarily removed (i.e. architrave and hinges still there) is counted as two habitable rooms.  
A lounge/dining room with the door permanently removed (hinge holes filled, etc.) is one habitable room.
A non-separated conservatory adds to the habitable room count if it has an internal quality door between it and the dwelling.  
If a conservatory is open to the rest of the dwelling it is NOT counted as a separate room.
10 ROOM COUNT AND LIVING AREA
10.1.1 Habitable room count
If a conservatory is open to the rest of the dwelling it is NOT counted as a separate room.
If a conservatory has an external quality door between it and the dwelling, then the conservatory is thermally separated from the dwelling and ignored for purposes of RdSAP.  
Refer to RdSAP Conventions applicable at the time of assessment for more details.
10 ROOM COUNT AND LIVING AREA
10.1.2 Heated habitable room count
Includes all habitable rooms heated by either main heating system(s) or fixed secondary heating Bedrooms with only open fireplaces are disregarded from the heated habitable room count when identifying the heating systems (main and secondary, refer to SAP10.2 Appendix A section A2.2).
10 ROOM COUNT AND LIVING AREA
10.2 Living area
The default living area fraction is determined from the number of habitable rooms.
Table 27 : Living area fraction.  
| Number of rooms: | $\mathbf{1}$ | $\mathbf{2}$ | $\mathbf{3}$ | $\mathbf{4}$ | $\mathbf{5}$ | $\mathbf{6}$ | $\mathbf{7}$ | $\mathbf{8}$ |
| :-- | :--: | :--: | :--: | :--: | :--: | :--: | :--: | :--: |
| Living area fraction: | 0.75 | 0.50 | 0.30 | 0.25 | 0.21 | 0.18 | 0.16 | 0.14 |
|  |  |  |  |  |  |  |  |  |
| Number of rooms: | $\mathbf{9}$ | $\mathbf{1 0}$ | $\mathbf{1 1}$ | $\mathbf{1 2}$ | $\mathbf{1 3}$ | $\mathbf{1 4}$ | $\mathbf{1 5 +}$ |  |
| Living area fraction: | 0.13 | 0.12 | 0.11 | 0.10 | 0.10 | 0.09 | 0.09 |  |  
The living area is then the fraction multiplied by the total floor area.
Table 27 gives default living area fractions. Alternatively, living area fraction can be calculated by dividing measured living area by measured total floor area.  
[^0]
[^0]:    ${ }^{9}$ In Scotland, usually referred to as 'apartments'.
11 SPACE AND WATER HEATING (REFER TO SAP10.2 APPENDIX A)
11.1 Main space heating system(s)
The main heating system is that which heats the largest proportion of dwelling. Main heating system not usually based on individual room heaters (unless only room heaters are present in the dwelling), and often provides hot water as well as space heating.  
Main heating systems are either identified via the Product Characteristics Database or are categorised on the basis of the generic types in Tables 4 a and 4 b in SAP10.2.  
In the case of gas or oil boilers, micro-CHP systems and heat pumps, the database is to be used whenever possible. There is a significant difference between the database efficiency values and the defaults in Table $4 \mathrm{a} / 4 \mathrm{~b}$ in many cases.  
In the case of micro-CHP system or a heat pump, if the Plant Size Ratio is out of range (this is described in Appendix N in SAP10.2 specification and incorporated in SAP and RdSAP software) the RdSAP software reports the situation advising the assessor to select:
11 SPACE AND WATER HEATING (REFER TO SAP10.2 APPENDIX A)
11.1 Main space heating system(s)
- in the case of micro-CHP, a condensing boiler;
- in the case of a heat pump, the appropriate one from Table 4a in SAP10.2.  
Otherwise space heating systems are those marked "rd" in Tables 4a and 4b in SAP10.2.
The following are to be assumed as not fan-assisted:  
- gas boiler pre 1998 with balanced or
- open flue oil boiler
- gas warm air, balanced or open flue  
Where no space heating system is present, the calculation is done for portable electric heaters (with no controls) in all habitable rooms. The control type for this case (as is needed for SAP10.2 Table 9) is 2, the same as for portable electric heaters with no controls.  
For treatment of unheated habitable rooms see SAP10.2 Appendix A.
Where one system is serving both radiators and underfloor, specify the same heat source as main heating 1 and main heating 2 following the rules for "two main heating systems" in RdSAP convention.
11 SPACE AND WATER HEATING (REFER TO SAP10.2 APPENDIX A)
11.2 Two main heating systems
RdSAP allows for two main heating systems.
There is an option for two main systems to cover the situation of different systems heating different parts of the dwelling.
If main system 1 heats all habitable rooms, there is no main system 2 unless it serves DHW only (see section 11.5).  
Main systems 1 and 2 cannot be room heaters except in the case of the dwelling's heating consisting solely of room heaters.  
A second main system is not to be confused with a secondary heater. See RdSAP Conventions for rules on secondary heaters.
11 SPACE AND WATER HEATING (REFER TO SAP10.2 APPENDIX A)
11.3 Space heating controls
Space heating controls are those marked "rd" in Table 4e in SAP10.2. Some control features whose effect is small are omitted.
11 SPACE AND WATER HEATING (REFER TO SAP10.2 APPENDIX A)
11.4 Secondary heating
The secondary heating system is a room heater type.  
In the case of micro-CHP (only) where SAP 10.2 Table N9 indicates a non-zero secondary heating requirement and no secondary heater has been specified, RdSAP should include secondary heating by portable electric heaters for the purposes of the calculation. A fixed heater in non-habitable rooms is still counted as a secondary heater. Refer to RdSAP conventions for more details.
11.4.1 Fuels for solid fuel fires
If the appliance can burn only one fuel, specify that fuel (includes exempted appliances burning wood in Smoke Control Areas). Otherwise: Refer to RdSAP conventions for more details.
11.4.1 Fuels for solid fuel fires
11.5 Water heating
The actual size of hot-water cylinder should be used if it can be obtained from the label on the cylinder. If the actual size is not determined, the size of a hot-water cylinder is taken as according to Table 28. Table 28 : Cylinder size  
|  Descriptor | Indicative
size range | Size to be used in SAP calculation *  |
| --- | --- | --- |
|  Inaccessible |  | if off-peak electric dual immersion: 210 litres
if from solid fuel boiler: 160 litres
otherwise: 110 litres  |
|  Normal | up to 130 litres | 110 litres  |
|  Medium | $131-170$ litres | 160 litres  |
|  Large | $>170$ litres | 210 litres  |
|  * Actual size to be used if present in the PCDB data set (and in conjunction with
Domestic Hot Water solar panel data where solar store volume is required) |  |   |  
If water is heated by a dual immersion and the electricity supply is a single meter include Addendum 6. An electric immersion is assumed dual in the following cases:  
- cylinder is inaccessible and electricity tariff is dual;
11.4.1 Fuels for solid fuel fires
11.5 Water heating
- cylinder is inaccessible and electricity tariff is dual;
- the DHW is heated by an electric boiler index (191) in SAP10.2 Table 4a and the electricity tariff is "dual".
11.4.1 Fuels for solid fuel fires
11.5.1 Separate boiler or heat pump for DHW
If there is a separate boiler or heat pump providing DHW only, specify the two main heating systems as follows:  
- main system 1 is the one providing space heating ( $100 \%$ of heat is from main system 1);
- main system 2 is the one providing DHW ( $0 \%$ of heat from main system 2);  
If both main heating systems supply space heating only, a generic DHW-only boiler can be selected from the water heating options.
11.4.1 Fuels for solid fuel fires
11.6 Back boilers
Where water heating is from a back boiler or room heater with boiler, and the boiler provides water heating only, the appropriate fire or room heater is identified in the data collection process, and the water heating is identified as from main system or from secondary system.  
Where the back boiler provides space heating:  
- if gas, the back boiler is selected as main heating, the associated fire is selected as the secondary heating, and the water heating is from main system.
- if oil or solid fuel, the combination of room heater and boiler is selected as main heating and provides the water heating as well.  
In the case of a gas fire with back boiler, the efficiency of the fire is from the room heater section of Table 4 a according to the type of fire and the efficiency of the back boiler is $65 \%$ (from water heating section of Table 4a).
11.4.1 Fuels for solid fuel fires
11.6 Back boilers
In the case of oil or solid fuel, the efficiency from the room heater section of Table 4a is applied to both the fire/room heater and the back boiler.
11.7 No water heating system
Where no water heating system is present, the calculation is done for an electric immersion heater. If the electric meter is dual the immersion heater is also dual, but is a single immersion otherwise (including unknown meter). The calculation is done for a cylinder defined by the first row of Table 28 : Cylinder size and the first row of Table 29 : Heating and hot water parameters.
11.7 No water heating system
11.8 Solar water heating
Calculation according to SAP 10.2. Refer to RdSAP Conventions for additional information.
11.7 No water heating system
11.9 Flue gas heat recovery
Calculation according to SAP 10.2 Appendix G. Refer to RdSAP Convention for additional information.
11.7 No water heating system
11.10 Waste water heat recovery
Calculation according to SAP 10.2 Appendix G. Refer to RdSAP Convention for additional information.
11.7 No water heating system
11.11 Space and water heating assumptions
Parameters in Table 29 : Heating and hot water parameters are supplementing data in Table 31 : Data to be collected  
Table 29 : Heating and hot water parameters  
|  Parameter | Value  |
| --- | --- |
|  Hot water cylinder insulation if not
accessible | Age band of main property A to F: 12 mm loose jacket
Age band of main property G, H: 25 mm foam
Age band of main property I to M: 38 mm foam  |
|  Cylinder thermostat if no access | No cylinder thermostat (but see also $\S 9.4 .9$ in SAP10.2,
A cylinder thermostat should be assumed to be present when
DHW is from heat network (HN), an immersion heater, a
thermal store, combi boiler or CPSU.  |
|  Cylinder heat exchanger area
(required for some database heat
pumps) | $1.0 \mathrm{~m}^{2}$
However, if data from database, from PCDB then all details
are from PCDB  |
|  Insulation of primary pipework | Age bands A to J: none
Age band K, L, M: full  |
|  Space heating circulation pump for
wet systems | Within heated space  |
11.7 No water heating system
11.11 Space and water heating assumptions
are from PCDB  |
|  Insulation of primary pipework | Age bands A to J: none
Age band K, L, M: full  |
|  Space heating circulation pump for
wet systems | Within heated space  |
|  Oil pump for oil boilers | Not in heated space  |  
|  Parameter | Value  |
| --- | --- |
|  Gas boilers pre-1998, balanced or open flue | Not fan-assisted  |
|  Oil boilers from SAP table | Not fan-assisted  |
|  CPSU | In airing cupboard
Gas: if data from Table 4b, store volume 80 litres, store loss rate $2.72 \mathrm{kWh} /$ day
Gas: if data from database use store volume and insulation thickness from database
Electric: store volume 300 litres, store loss rate $3.16 \mathrm{kWh} /$ day, store temperature $90^{\circ} \mathrm{C}$  |
|  Gas warm air system, balanced or open flue (not the fan-assisted types) | Not fan assisted  |
|  Solid fuel boiler or room heater | Not HETAS approved  |
11.7 No water heating system
11.11 Space and water heating assumptions
|  Gas warm air system, balanced or open flue (not the fan-assisted types) | Not fan assisted  |
|  Solid fuel boiler or room heater | Not HETAS approved  |
|  Underfloor heating | If dwelling has a ground floor, then according to the floor construction (see Table 19 if unknown):
- solid, main property age band A to E: concrete slab
- solid, main property age band F to M: in screed
- suspended timber: in timber floor
- suspended, not timber: in screed
Otherwise (i.e. upper floor flats), take floor as suspended timber if the wall is timber frame and as solid for any other wall type, and apply the rules above.  |
|  Emitter temperature for condensing boilers and heat pumps | If unknown in RdSAP dataset:
- if heating by radiators, $>45^{\circ} \mathrm{C}$
- underfloor heating, $<=35^{\circ} \mathrm{C}$  |
|  Design water use target not more than 125 litres per person per day | No  |
|  Hot water separately timed | No programmer, pre-1998 boiler: - No
Programmer, pre-1998 boiler: - Yes
11.7 No water heating system
11.11 Space and water heating assumptions
|  Design water use target not more than 125 litres per person per day | No  |
|  Hot water separately timed | No programmer, pre-1998 boiler: - No
Programmer, pre-1998 boiler: - Yes
Post-1998 boiler: - Yes  |
|  Hot water cylinder in heated space | Yes  |
|  Boiler interlock | Assumed present if there is a room thermostat and (for stored hot water systems heated by the boiler) a cylinder thermostat. Otherwise not interlocked.  |
|  Summer immersion where DHW is provided by a solid fuel open fire or closed room heater | Yes; single immersion unless already has dual immersion  |
|  Supplementary immersion heater for DHW from heat pump | Yes if generic heat pump supplying space and water heating (from Table 4a in SAP10.2).
Not applicable if heat pump from database since supplementary heating is incorporated in the water heating efficiency in the database record.
Assume dual immersion if electricity tariff is dual, otherwise single immersion.  |
11.7 No water heating system
11.11 Space and water heating assumptions
Assume dual immersion if electricity tariff is dual, otherwise single immersion.  |
|  Electricity tariff | See section 13  |  
| Parameter | Value |
| :--: | :--: |
11.7 No water heating system
11.11 Space and water heating assumptions
|  Electricity tariff | See section 13  |  
| Parameter | Value |
| :--: | :--: |
| Solar panel | If solar panel present, the parameters for the calculation not provided in the RdSAP data set are: <br> - panel aperture area $3 \mathrm{~m}^{2}$ <br> - flat panel, $\eta_{0}=0.80, \mathrm{a}_{1}=4.0, \mathrm{a}_{2}=0.01$ <br> - facing South, pitch $30^{\circ}$, modest overshading <br> - if regular boiler: combined cylinder, solar part one-third of total rounded to nearest litre (if separate pre-heat cylinder, assess total cylinder size (Table 28) on the basis of both cylinders) <br> - if water heating by: <br> - combi boiler <br> - CPSU <br> - heat pump (including hot water only) <br> - micro-CHP with integral DHW vessel <br> - instantaneous water heater <br> - or community heating <br> assume a 75 -litre pre-heat cylinder. <br> - pump for solar-heated water is electric ( $75 \mathrm{kWh} /$ year) <br> - showers are both electric and non-electric |
11.7 No water heating system
11.11 Space and water heating assumptions
| Storage waste water heat recovery WWHR system | Dedicated storage volume: <br> - if combined, one third of the total cylinder size rounded to the nearest litre <br> - if separate, the mean of the high and low dedicated volumes in the data record, rounded to the nearest litre. |
| Heat Network (HN) supplying <br> - space and water, or <br> - space heating only | For HN with data in the PCDB, the network data are used for plant efficiency, distribution loss and pumping energy. <br> Otherwise: <br> - system based on boilers with efficiency $80 \%$ or heat pump with efficiency $300 \%$ <br> - see Table 12c in SAP10.2 <br> - if CHP (waste heat or geothermal treat as CHP): fraction of heat from $\mathrm{CHP}=0.35$ <br> CHP overall efficiency $75 \%$ <br> heat to power ratio $=2.0$ <br> boiler efficiency $80 \%$ |
11.7 No water heating system
11.11 Space and water heating assumptions
| Heat Network (HN) supplying <br> - water heating only | For HN with data in the PCDB, the network data are used for plant efficiency, distribution loss and pumping energy. <br> Otherwise: <br> - system based on boilers with efficiency $80 \%$ or heat pump with efficiency $300 \%$ <br> - flat-rate charging <br> or if CHP fraction of heat from $\mathrm{CHP}=1.0$ CHP overall efficiency $75 \%$ heat to power ratio $=2.0$ |
| HN - charging method | As per SAP10.2 Table 4e Group 3: Heat networks |
12 ADDITIONAL ITEMS
12.1 Photovoltaics
The calculation is as follows:
a) If the kWp (or DNC) is known, calculate the annual contribution according to M1 in Appendix M. Up to three separate PV arrays are allowed for, each with their own kWp, tilt orientation and overshading as given in SAP10.2 Table H2, so that RdSAP10 uses the same overshading for PV and solar thermal.
b) If the kWp (or DNC) is not known use the following:  
- PV area is roof area for heat loss (before amendment for any room-in-roof), times percent of roof area covered by PVs, and if pitched roof divided by $\cos \left(35^{\circ}\right)$. If there is an extension, the roof area is adjusted by the cosine factor only for those parts having a pitched roof.
- kWp is $0.12 \times$ PV area.
- if not provided in the RdSAP data set then facing South, pitch $30^{\circ}$, modest overshading
12 ADDITIONAL ITEMS
12.1 Photovoltaics
- kWp is $0.12 \times$ PV area.
- if not provided in the RdSAP data set then facing South, pitch $30^{\circ}$, modest overshading  
Basis of " 0.12 ": mainstream solar panels generate an average of around $120 \mathrm{Wp}(0.12 \mathrm{kWp})$ per square meter. Hence for a 1 kWp system you will need around 8 m 2 of roof size.  
Calculation example if kWp or DNC of PV battery is not known:
Estimated ceiling area is $10 \mathrm{~m}^{2}$
Divide $10 \mathrm{~m}^{2}$ by $\cos (35)$ to estimate the required area of pitched roof; $10 / 0.819=12.2 \mathrm{~m}^{2}$.
$\mathrm{kWp}=12.2^{*} 1.2=1.46 \mathrm{kWp}$
Refer to RdSAP Conventions for more details.
12 ADDITIONAL ITEMS
12.2 PV diverters and PV batteries
If PV diverters are present, the calculation procedure is given in SAP 10.2 section G4.
Assessor needs to collect information on:  
1) Number of Batteries;
2) Capacity of each battery:  
- Use default capacity of one battery $=5 \mathrm{~kW}$ if actual capacity not available, or
- Actual capacity
12 ADDITIONAL ITEMS
12.3 Wind turbine
If present and details not provided in the RdSAP data set, calculate for 1 turbine with 2 m rotor diameter and 2 m hub height.
12 ADDITIONAL ITEMS
12.4 Small scale hydro generators
If present and details are available, the calculation is according to SAP10.2 specification, where the calculation can be either for a year or for each month.
12 ADDITIONAL ITEMS
12.5 Shutters and blinds
Shutter is a product, where the curtain is made of a rigid material, installed to provide or modify characteristics such as thermal and visual properties of an existing glazed surface (e.g. window, door) to which it is applied.  
The approach applies to all shutters and external venetian blinds whatever their use and nature of the materials used:  
$$
U_{\text {window_and_shutter }}=\frac{1}{1 / U_{\text {window }}+\Delta R}
$$  
Where:
$U_{\text {window }}-$ U-value of a whole window (including window frame) without a shutter, W/m2K
$U_{\text {window_and_shutter }}-$ U-value of a whole window without a shutter, W/m2K
$\Delta \mathrm{R}-$ additional resistance, $\mathrm{m}^{2} \mathrm{~K} / \mathrm{W}$
Refer to Table 24 : Window characteristics for $\Delta \mathrm{R}$ associated with shutters and blinds.
12.6 Special features (Appendix Q technologies)
The procedures described in Appendix Q are also applicable to RdSAP assessments. Only Appendix Q items marked "for the use in RdSAP" should be used.
12.6 Special features (Appendix Q technologies)
12.7 Technical Notes
The procedures described in Technical Notes are also applicable to RdSAP assessments. RdSAP software should therefore allow using Technical Notes marked "for the RdSAP use."
12.6 Special features (Appendix Q technologies)
12.8 Terrain
Terrain type should be based on the abundance of obstacles in the curtilage of the dwelling, not necessarily the characteristics of the surrounding area.  
For example, a site containing a number of dwellings but away from a village/town should be classed as suburban as the number of dwellings would likely make the use of a wind turbine unviable.
13 ELECTRICITY TARIFF
The electricity meter is recorded as single, dual (two separate readings), dual 18-hour, dual 24-hour or unknown (if inaccessible). Dual 24-hour is possible in Scotland and some parts of northern Northumberland.  
Off-peak tariff is needed for the intended operation of:  
- electric storage heaters (401 to 409)
- underfloor heating (421 or 422 , but not 424 )
- electric dry core or water storage boiler $(193,195)$
- electric CPSU (192)
- dual electric immersion  
If it is a single meter when any of these are present enter heating as panel heaters and/or immersion as single, and include Addendum 6.  
If the electricity meter is unknown, treat as single meter except where:  
- main heating or water heating are intended to run off an off-peak tariff (per systems listed in text box above) or
- main heating is ground source or water source heat pump.  
If that results in a dual meter, assign tariff per rules 1. to 4. below.
13 ELECTRICITY TARIFF
- main heating is ground source or water source heat pump.  
If that results in a dual meter, assign tariff per rules 1. to 4. below.
If the electricity meter is single, the tariff is standard electric tariff and if the meter is dual 18-hour/24-hour it is 18 -hour/24-hour tariff. Otherwise the choice between 7 -hour and 10 -hour is determined as follows.  
1. If the main heating system (or main system if there are two) is an electric CPSU (192) it is 10 -hour tariff.
2. Otherwise, if the main heating system (or either main system if there are two) is:  
- electric storage heaters (401 to 409), or
- electric dry core or water storage boiler (193 or 195), or
- electric underfloor heating (421 or 422)
it is 7 -hour tariff.  
3. If that has not resolved it then if the main heating system (or either main system if there are two) is:  
- direct-acting electric boiler (191), or
- heat pump (211 to 224,521 to 524 , or database), or
13 ELECTRICITY TARIFF
- direct-acting electric boiler (191), or
- heat pump (211 to 224,521 to 524 , or database), or
- electric room heaters (unless assumed because there is no heating system).
it is 10 -hour tariff.  
4. If none of the above applies it is 7 -hour tariff. This includes assumed electric heaters because there is no heating system.  
A dual meter is possible even if off-peak is not used for heating or DHW.
If dual, assign electricity uses to tariffs according to 12.4.3.
14 ADDENDUM TO EPCS
Where a feature, e.g. wall type or heating system, is not part of the reduced data set, a near equivalent should be selected. For the circumstances indicated below, an explanation can be provided on the EPC by way of an addendum.  
Table 30 : Addendum  
|  Reference
Number | Circumstances | Addendum text on EPC  |
| --- | --- | --- |
|  1 | Wall type does not correspond to options available in RdSAP | The dwelling has a type of wall that is not included in the available options. The nearest equivalent type was used for the assessment.  |
|  4 | Dwelling has a swimming pool | The energy assessment for the dwelling does not include energy used to heat the swimming pool.  |
|  5 | Dwelling has micro-CHP | The performance characteristics of the micro-CHP system in this dwelling are not known and default values were used for the assessment.  |
14 ADDENDUM TO EPCS
|  5 | Dwelling has micro-CHP | The performance characteristics of the micro-CHP system in this dwelling are not known and default values were used for the assessment.  |
|  6 | Off-peak appliance(s) with single meter | A dual rate appliance(s) is present with a single-rate supply. A single-rate appliance has been used for the assessment. Changing the electricity tariff to an offpeak (dual rate) supply is likely to reduce fuel costs and improve the energy rating.  |
|  8 | PVs or wind turbine present on the property (England, Wales or Scotland) | The assessment does not include any feed-in tariffs that may be applicable to this property but may include a benefit for the export of excess generation to the Grid.  |
|  9 | Two main heating systems and heating system upgrade is recommended | As there is more than one heating system, you should seek professional advice on the most cost-effective option for upgrading the systems.  |
14 ADDENDUM TO EPCS
|  10 | Dual electricity meter selected but there is also an electricity meter for standard tariff | The assessment has been done on the basis of an offpeak electricity tariff. However some heating or hot water appliances may be on the standard domestic tariff.  |
|  11 | Single electricity meter selected but there is also an electricity meter for an off-peak tariff | The assessment has been done on the basis of the standard domestic electricity tariff. However some heating or hot water appliances may be on an off-peak tariff.  |
|  12 | Dwelling is using a biomass fuel that is not in the RdSAP fuel options | The dwelling uses a type of fuel that is not included in the available options. The nearest equivalent fuel type was used for the assessment.  |
|  13 | Dwelling has a special energy saving feature | The dwelling has a special energy saving feature which is recognised in the assessment, but its impact on the savings shown for other improvement measures is ignored.  |
14 ADDENDUM TO EPCS
|  14 | Conservation area | Conservation area  |
|  15 | PV recommended | When considering the PV installation consider installing PV battery and a PV diverter for water heating  |
|  16 | PV-independent battery storage present | The assessment does not include PV-independent battery storage  |  
| Reference <br> Number | Circumstances | Addendum text on EPC |
| :-- | :-- | :-- |
| 17 | "Phase-changing" heat storage present | The assessment does not include "Phase-changing" heat <br> storage |
| 18 | Party wall insulation | Party wall is a property of two homes. If acoustic <br> issues are important seek professional advice before <br> insulating party wall. Insulating party wall on one side <br> may cause condensation risk to adjoining property. |
14 ADDENDUM TO EPCS
The list of addenda shown above is current at the date of this document; items will be modified or added as appropriate. An addendum may be added as a temporary measure; if an addendum is used frequently the reduced data set will be extended in a future revision so as to avoid the need for it.  
Software displays the current list of possible addenda (showing the 'circumstances' for each one); the assessor can select one or more to be included on the EPC.
15 CLIMATE DATA
For ratings (SAP rating and EI rating), the calculations are done using the UK average climate data as follows:  
External temperature: row for UK average in SAP10.2 Table U1.
Wind speed: row for UK average in SAP 10.2 Table U2.
Solar radiation on horizontal surfaces: row for UK average in SAP 10.2 Table U3.
Solar radiation on vertical surfaces (for calculation of solar gains) and solar radiation on inclined surfaces (for solar panels and PVs): from the radiation on the horizontal converted by the procedures in SAP10.2 section U3.2.  
For costs and savings, energy demand, total emissions and primary energy, the calculations are done using the climate data for the location of the property, as follows:  
External temperature, wind speed, solar radiation on horizontal surfaces: data provided for each postcode district.
15 CLIMATE DATA
External temperature, wind speed, solar radiation on horizontal surfaces: data provided for each postcode district.
Solar radiation on vertical surfaces (for calculation of solar gains) and solar radiation on inclined surfaces (for solar panels and PVs): from the radiation on the horizontal for the property's postcode converted by the procedures in SAP10.2 section U3.2.
16 ROUNDING OF DATA
For consistency of application, after expanding the RdSAP data into SAP data using the rules in this Appendix, the data are rounded before being passed to the SAP calculator. The rounding rules are:  
U-values: 2 d.p.
All element areas (gross) including window areas and conservatory wall area: 2 d.p.
All internal floor areas and living area: 2 d.p.
Storey heights and conservatory height: 2 d.p.
Draught strip percent and multiple glazing percent: integer
Solar part of combined cylinder: integer
kWp for photovoltaics, etc.: 2 d.p.
17 IMPROVEMENT MEASURES
The effect of improvement measures is assessed by amending the data for the existing dwelling according to the improvement measure being considered.  
When a number of measures are being considered, the effect of any one of them on the SAP and Environmental Impact ratings depends, in general, on the order in which they are introduced. A standard list of improvement measures and how their effect on energy performance is to be assessed is provided in Section 21.
17 IMPROVEMENT MEASURES
Recommendations should be supressed by RdSAP Assessor only if there is documentary evidence showing that a specific recommendation is not appropriate. A listed building or a property in a conservation area is not sufficient grounds in its own right to suppress a recommendation. If a recommendation is removed this must be recorded with reasons in site notes. Further guidance on specific recommendations can be sought from an appropriate professional organisation, for example heating engineers, building control officers, product manufacturers, trade associations, etc.
18 DATA TO BE COLLECTED
Table 31 : Data to be collected  
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
| FOR THE DWELLING AS A WHOLE |  |  |  |
| $1-1$ | Country | One of: <br> - England <br> - Wales <br> - Scotland <br> - Northern Ireland <br> - Isle of Man |  |
| $1-2$ | Region | One of those in SAP 10.2 Table U1 <br> For Isle of Man see section 19 of this document | Derived from the postcode of the property <br> (Note: for Isle of Man use Region 22, Isle of Man for all postcodes) <br> See section 19 Additional climate Data for Isle of Man |
| $1-3$ | Transaction type | One of: <br> - marketed sale <br> - non-marketed sale <br> - rental <br> - grant-scheme (ECO, RHI, etc.) <br> - non-grant scheme (e.g MEES) <br> - stock condition survey/EESSH <br> - re-mortgaging <br> - none of the above | Non-marketed sale includes right-to-buy <br> Refer to RdSAP Conventions for additional details. |
18 DATA TO BE COLLECTED
| $1-4$ | Tenure | One of <br> - owner-occupied <br> - rented (social) <br> - rented (private) <br> - unknown | Private rented includes institutions (e.g. university); Refer to RdSAP Conventions for additional details. |
| $1-5$ | Dwelling type | One of <br> - house <br> - bungalow <br> - flat <br> - maisonette <br> - park home |  |
| $1-6$ | Built form and detachment | Classification according to section 2.1 of this document. | Detachment does not need to be recorded for flats/maisonettes, provided that internal dimensions are being used. |
| $1-7$ | Number of rooms | Number of habitable rooms and <br> Number of heated habitable rooms | Total number of habitable rooms as defined in section 10.1, inclusive of main property and any extension. <br> A heated habitable room is one with a fixed heat emitter in the room. |  
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
18 DATA TO BE COLLECTED
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
|  |  |  | Refer to Section A3.2 in Appendix A3 (in SAP10.2). <br> Note: this is used to define which heating is main and which is a secondary in inadequately heated dwellings. |
| $1-8$ | Dimension type | Measured internally or externally | Applies to areas and perimeters. Room heights always measured internally within the room. See section 4. |
| $1-9$ | Conservatory | One of <br> - no conservatory <br> - separated, no fixed heaters <br> - separated, fixed heaters <br> - not separated | For the definition of separated conservatory see section 3.3.3 in SAP10.2. <br> Separated conservatory - use the approach given in section 7.2. |
| $1-10$ | Non-separated conservatory only | Floor area <br> Glazed perimeter <br> Double glazed (yes/no) <br> Height (number of half storeys of main dwelling) | Non-separated conservatory use the approach given in section 7.1 |
18 DATA TO BE COLLECTED
| $1-11$ | Flats and maisonettes only | Heat loss corridor/stairwell, one of: <br> - no corridor/stairwell <br> - heated corridor/stairwell <br> - unheated corridor <br> --unheated stairwell |  |
| $1-12$ |  | If unheated corridor/stairwell, length of sheltered wall adjacent to corridor/stairwell | This is the length of wall between flat and corridor/stairwell. <br> If a flat or maisonette is sheltered on more than one storey this is the total of the sheltered lengths on each storey. |
| $1-13$ |  | Floor level relative to the lowest level of the building ( 0 for ground floor). | This is the lowest floor level if property has more than one storey. If there is a basement, the basement is level 0 and the other floors from 1 upwards. |
| $1-14$ |  | Property position, one of: <br> - ground floor <br> - mid floor <br> - top floor | This is used for the description of the dwelling type on the EPC (e.g. 'Top-floor flat') |
18 DATA TO BE COLLECTED
| $1-14$ |  | Property position, one of: <br> - ground floor <br> - mid floor <br> - top floor | This is used for the description of the dwelling type on the EPC (e.g. 'Top-floor flat') |
| $1-15$ | Number of extensions (assuming that there are one or more extensions) | Between 1 and 4 |  |  
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
| $1-16$ | Is dwelling exportcapable | Yes or No | The savings associated with generated electricity depends on whether it is used directly within the dwelling or exported. Savings depend on factor $\beta$ (from 0 to 1 ) which indicates proportion of electricity used in the dwelling. <br> See Section M in SAP10.2 specification. |
| $1-17$ | Presence of smart meter | Yes or No | Does not affect the calculation; used for statistical reasons only. |
| $1-18$ | Presence of smart meter for gas | Yes or No | Does not affect the calculation; used for statistical reasons only. |
18 DATA TO BE COLLECTED
| $1-18$ | Presence of smart meter for gas | Yes or No | Does not affect the calculation; used for statistical reasons only. |
|  | FOR EACH BUILDING PART <br> A building part is main dwelling, extension 1, extension 2, extension 3 or extension 4 |  |  |
| $2-1$ | Age band | According to Table 1 : Age bands | Note differences for England, Wales, Scotland, NI, and Isle of Man |
18 DATA TO BE COLLECTED
| $2-1$ | Age band | According to Table 1 : Age bands | Note differences for England, Wales, Scotland, NI, and Isle of Man |
| $2-2$ | Below the building part | Below the building part there is: <br> a) ground floor <br> b) partially/intermittently heated space (commercial premises) <br> c) unheated space <br> d) external air <br> e) same dwelling <br> f) another dwelling | a) Ground floor: use $\S \mathbf{6 . 1 2}$ <br> b) A partially heated space below applies when a building part is above non-domestic premises. Refer to § 6.14 <br> c) An unheated space below applies when it is above a space not used for habitation. <br> Refer to Table 20, and Table 19 <br> External air is treated as "exposed", Refer to Table 20 <br> "Same dwelling": $\mathrm{U}=0$ <br> "Another dwelling": $\mathrm{U}=0$ <br> If a building part is above more than one type, it is classified according to the largest floor area concerned. |  
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
18 DATA TO BE COLLECTED
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
| $2-3$ | Above the building part | Above the building part there is: <br> a) pitched roof (slates or tiles), access to loft <br> b) pitched roof (slates or tiles), no access <br> c) pitched roof, sloping ceiling <br> d) pitched roof (thatched) <br> e) flat roof <br> f) non-residential/other unheated space <br> g) same dwelling above <br> h) another dwelling above | See section 6 <br> a) Table 16 or U-value <br> b) Table 18 <br> c) Table 18 <br> d) Table 18 <br> e) Table 18 <br> f) value from Table 18 column (3) and $\mathrm{R}=0.5$ $\mathrm{m} / \mathrm{K} / \mathrm{W}$ as given in section 2.14 <br> g) $\mathrm{U}=0$ <br> h) $\mathrm{U}=0$ <br> For a park home select pitched or flat roof type as appropriate. |
18 DATA TO BE COLLECTED
| $2-4$ | Dimensions | For each storey: <br> - Area <br> - Average room height <br> - Exposed perimeter (from lowest occupied floor up to lowest occupied +6 ) <br> - Party wall length on each storey | For each building part. <br> If measured externally, Table 2 is used to convert floor areas and perimeters to internal dimensions. <br> Floor area and exposed perimeter used for calculating floor U-value. |
| Floor |  |  |  |
| $3-1$ | Floor construction | One of: <br> - unknown <br> - solid <br> - basement floor <br> - suspended timber <br> - suspended, not timber | For lowest floor of the building part. Not if another dwelling or other premises below. <br> Details used for ventilation algorithm and for U-value according to 6.12 |
18 DATA TO BE COLLECTED
| $3-2$ | Floor insulation | One of: <br> - unknown <br> - as built <br> - retro-fitted | Not if another dwelling or other premises below. <br> There must be evidence for retro-fitted insulation. <br> Table 19 : Basis for floor Uvalue calculation for ground floors when insulation thickness is unknown |  
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
| $3-3$ | Floor insulation thickness | One of: <br> - unknown <br> - 25 mm <br> - 50 mm <br> - 75 mm <br> - 100 mm <br> - 125 mm <br> - 150 mm <br> -175 mm <br> -200 mm | Only if floor insulation is retrofitted. Applies to ground floors and exposed upper floors. <br> Assessor specifies thickness of floor insulation (in mm), and software calculates U-value according to $\S \mathbf{6 . 1 2}$; <br> or Table 19 is used when insulation thickness is unknown. |
18 DATA TO BE COLLECTED
| $3-4$ | Known floor U-value | U-value in $\mathrm{W} / \mathrm{m}^{2}$ | 'U-value' calculated on a basis of insulation thickness according to $\S \mathbf{6 . 1 2}$ and known U-value are mutually exclusive alternatives. |
|  | Walls |  |  |
| $4-1$ | Wall type | External wall <br> Alternative wall 1 <br> Alternative wall 2 | for each building part |
| $4-2$ | Wall construction of each wall type | One of: <br> - stone (granite or whinstone) <br> - stone (sandstone or limestone) <br> - solid brick <br> - cob <br> - cavity <br> - timber frame <br> - park home wall <br> - system build (i.e. any other) <br> - basement wall <br> - curtain wall | "park home wall" is the only option for a park home. <br> Measurement of basement walls will be subject to RdSAP Conventions. |
18 DATA TO BE COLLECTED
| $4-3$ | Wall thickness of each wall type | Wall thickness in mm (or unknown if it cannot be measured). | Where thickness varies for the same construction use the average of the measured values. For curtain wall thickness of wall is not required as it can be included only via specifying Uvalue. |
| $4-4$ | Wall insulation type of each wall type | One of: <br> - as built <br> - external <br> - filled cavity <br> - internal <br> - cavity plus external <br> - cavity plus internal <br> - unknown | External, cavity or internal insulation to be indicated only if added subsequent to original construction and evidence exists. <br> If it has only the insulation that was part of the original construction it is 'as built.' |  
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
18 DATA TO BE COLLECTED
| Code | Item | Data | Comment |
| :--: | :--: | :--: | :--: |
| $4-5$ | Known wall insulation thickness for each stone or brick wall <br> (Applies to U-value for insulated walls in age bands A to E where equations are used to calculate U -value of uninsulated wall) | One of: <br> - unknown <br> - 10 mm <br> - 25 mm <br> - 50 mm <br> - 75 mm <br> - 100 mm <br> - 125 mm <br> - 150 mm <br> - 175 mm <br> - 200 mm <br> - other measured thickness, mm | Only if wall insulation is external, internal, or cavity (filled or unfilled) plus external or internal. <br> Table 14 : Insulation thickness and corresponding resistance |