Total........................................................... 111.1 14.7 7.4 12.5 12.5 18.9 18.6 17.3 9.2

Floorspace (Square Feet)

Total Floorspace1

Fewer than 500.................................... 3.2 0.7 Q 0.3 0.3 0.7 0.6 0.3 Q

500 to 999........................................... 23.8 2.7 1.4 2.2 2.8 5.5 5.1 3.0 1.1

1,000 to 1,499..................................... 20.8 2.3 1.4 2.4 2.5 3.5 3.5 3.6 1.6

1,500 to 1,999..................................... 15.4 1.8 1.4 2.2 2.0 2.4 2.4 2.1 1.2

2,000 to 2,499..................................... 12.2 1.4 0.9 1.8 1.4 2.2 2.1 1.6 0.8

2,500 to 2,999..................................... 10.3 1.6 0.9 1.1 1.1 1.5 1.5 1.7 0.8

3,000 to 3,499..................................... 6.7 1.0 0.5 0.8 0.8 1.2 0.8 0.9 0.8

3,500 to 3,999..................................... 5.2 1.1 0.3 0.7 0.7 0.4 0.5 1.0 0.5

4,000 or More...................................... 13.3 2.1 0.5 0.9 0.8 1.5 2.2 3.1 2.2

Heated Floorspace

None.................................................... 3.6 Q 0.3 0.2 0.6 1.0 0.5 0.5 Q

Fewer than 500.................................... 6.1 1.2 0.4 0.7 0.9 1.3 0.8 0.6 0.2

500 to 999........................................... 27.7 3.8 2.4 3.2 2.9 5.3 5.5 3.4 1.3

1,000 to 1,499..................................... 26.0 3.4 1.7 3.4 2.9 4.6 4.2 4.0 1.9

1,500 to 1,999..................................... 17.6 2.2 1.0 2.4 2.1 3.0 2.5 2.8 1.6

2,000 to 2,499..................................... 10.7 1.5 0.6 1.2 1.1 1.6 2.1 1.5 1.1

2,500 to 2,999..................................... 7.7 0.8 0.5 0.7 1.0 0.8 1.3 1.7 0.9

3,000 to 3,499..................................... 3.8 0.6 Q Q 0.4 0.6 0.4 0.8 0.5

3,500 to 3,999..................................... 2.6 0.5 Q Q 0.3 Q 0.3 0.6 0.4

4,000 or More...................................... 5.2 0.6 Q 0.3 Q 0.6 0.9 1.5 0.9

Centrally Cooled Floorspace

None.................................................... 45.2 10.9 4.8 6.4 5.7 7.7 5.3 3.4 1.1

Fewer than 500.................................... 3.9 Q Q 0.4 0.3 1.0 1.0 0.6 0.4

500 to 999........................................... 15.0 1.0 0.6 1.2 1.5 2.6 4.1 2.9 1.1

1,000 to 1,499..................................... 15.6 0.9 0.8 1.8 1.7 2.7 2.5 3.5 1.7

1,500 to 1,999..................................... 11.1 0.5 0.6 1.2 1.2 2.3 1.9 2.0 1.4

2,000 to 2,499..................................... 7.0 0.3 Q 0.8 0.8 1.1 1.4 1.4 1.1

2,500 to 2,999..................................... 5.2 0.3 Q 0.4 0.7 0.5 1.0 1.3 0.8

3,000 to 3,499..................................... 2.7 0.3 Q Q Q 0.5 0.4 0.6 0.4

3,500 to 3,999..................................... 1.8 Q Q Q Q Q 0.3 0.6 0.4

4,000 or More...................................... 3.5 0.3 Q Q Q 0.3 0.6 1.1 0.8

Rooms

Total Number of Rooms

(Excluding Bathrooms)

1 or 2................................................... 3.4 0.5 0.3 0.4 0.4 0.7 0.5 0.5 Q

3.......................................................... 8.6 1.0 0.5 0.6 1.0 1.9 1.9 1.1 0.6

4.......................................................... 16.9 2.6 1.3 2.0 1.6 3.5 2.9 2.3 0.7

5.......................................................... 23.9 2.9 1.8 3.3 2.5 4.1 3.8 3.4 2.0

6.......................................................... 22.9 2.5 1.7 3.4 2.9 3.6 3.7 3.4 1.8

7.......................................................... 16.5 2.5 1.0 1.7 2.0 2.6 2.7 2.5 1.4

8.......................................................... 9.8 1.4 0.4 0.6 1.0 1.4 1.7 2.0 1.2

9 or More............................................. 9.2 1.4 0.4 0.5 1.0 1.2 1.4 2.1 1.3

Table HC5.2 Living Space Characteristics by Year of Construction, 2005

Living Space Characteristics

1970 to 

1979

1980 to 

1989

1990 to 

1999

2000 to 

2005

 Million U.S. Housing Units

Year of Construction

Housing 

Units 

(millions)

Before 

1940

1940 to 

1949

1950 to 

1959

1960 to 

1969

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC5.2 Living Space Characteristics by Year of Construction, 2005

Living Space Characteristics

1970 to 

1979

1980 to 

1989

1990 to 

1999

2000 to 

2005

 Million U.S. Housing Units

Year of Construction

Housing 

Units 

(millions)

Before 

1940

1940 to 

1949

1950 to 

1959

1960 to 

1969

Bedrooms

None (Studio/Efficiency)...................... 1.9 0.4 Q Q 0.2 0.4 0.2 Q Q

1.......................................................... 10.2 1.4 0.8 0.9 1.2 2.1 1.9 1.3 0.6

2.......................................................... 28.7 4.8 2.4 3.9 2.8 5.5 4.8 3.0 1.4

3.......................................................... 47.5 5.0 2.9 5.8 5.4 7.9 8.3 8.1 4.1

4.......................................................... 18.4 2.2 0.9 1.5 2.2 2.4 2.8 3.8 2.5

5 or More............................................. 4.3 0.8 Q 0.2 0.6 0.6 0.5 0.9 0.5

Other Rooms (Excluding Bathrooms)

None (Studio/Efficiency)...................... 1.9 0.4 Q Q 0.2 0.4 0.2 Q Q

1.......................................................... 5.3 0.4 0.3 0.3 0.6 1.1 0.9 1.2 0.5

2.......................................................... 37.4 3.9 2.4 4.7 4.5 7.3 6.7 5.3 2.4

3.......................................................... 35.0 5.0 2.9 4.8 3.7 5.5 5.5 4.8 2.9

4.......................................................... 19.2 3.1 1.0 1.7 2.1 2.9 3.3 3.2 1.8

5 or More............................................. 12.2 1.8 0.5 0.9 1.3 1.8 1.9 2.6 1.5

Full Bathrooms

None.................................................... 0.3 Q Q N QQQQN

1.......................................................... 54.9 11.2 5.5 8.7 7.6 9.5 7.0 3.9 1.4

2.......................................................... 45.9 2.8 1.5 3.3 4.1 8.0 9.6 10.5 6.0

3 or More............................................. 9.9 0.5 0.4 0.5 0.7 1.2 1.9 2.9 1.8

Half Bathrooms

None.................................................... 79.4 10.8 5.7 10.0 9.1 13.9 12.6 11.6 5.7

1.......................................................... 29.7 3.4 1.6 2.5 3.0 4.8 5.5 5.5 3.4

2 or More............................................. 2.0 0.5 Q Q Q Q 0.5 0.2 Q

Basements

Basement in Single-Family Homes

and Apartments in 2-4 Unit Buildings

Yes...................................................... 35.5 8.3 3.2 5.5 3.6 4.1 3.7 4.6 2.5

No........................................................ 51.9 4.9 3.2 5.9 6.3 8.8 9.4 8.5 4.9

Not Asked (Mobile Homes or Apartment in

Buildings with 5 or More Units)............ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Finished Basement

Yes.................................................. 16.7 2.0 1.4 2.6 2.6 2.4 2.1 2.9 0.8

No.................................................... 18.7 6.3 1.9 2.9 1.0 1.7 1.6 1.8 1.6

No Basement................................... 51.9 4.9 3.2 5.9 6.3 8.8 9.4 8.5 4.9

Not Asked........................................ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Number of Finished Rooms

in Basement

1...................................................... 8.1 1.2 1.0 1.2 1.3 1.1 0.8 1.1 0.4

2...................................................... 3.8 0.4 0.3 0.7 0.7 0.5 0.5 0.6 Q

3 or More......................................... 4.8 0.5 Q 0.7 0.6 0.8 0.8 1.1 Q

None (Basement Unfinished)........... 18.7 6.3 1.9 2.9 1.0 1.7 1.6 1.8 1.6

No Basement................................... 51.9 4.9 3.2 5.9 6.3 8.8 9.4 8.5 4.9

Not Asked........................................ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC5.2 Living Space Characteristics by Year of Construction, 2005

Living Space Characteristics

1970 to 

1979

1980 to 

1989

1990 to 

1999

2000 to 

2005

 Million U.S. Housing Units

Year of Construction

Housing 

Units 

(millions)

Before 

1940

1940 to 

1949

1950 to 

1959

1960 to 

1969

Heated Basement

Yes.................................................. 20.7 3.3 2.0 3.3 2.4 2.7 2.4 3.0 1.5

All................................................. 14.3 2.2 1.3 2.2 1.8 2.1 1.7 2.0 1.0

Part.............................................. 6.4 1.1 0.6 1.1 0.7 0.6 0.7 1.1 0.5

None (Basement Not Heated).......... 14.8 5.0 1.3 2.2 1.2 1.4 1.3 1.6 0.9

No Basement................................... 51.9 4.9 3.2 5.9 6.3 8.8 9.4 8.5 4.9

Not Asked........................................ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Air-Conditioned Basement

Yes.................................................. 11.4 1.0 0.7 1.7 1.6 1.4 1.6 2.3 1.1

All................................................. 8.4 0.8 0.6 1.3 1.2 1.2 1.2 1.5 0.7

Part.............................................. 3.0 Q Q 0.5 0.4 Q 0.4 0.8 0.4

No (Basement Not Cooled).............. 24.1 7.4 2.5 3.7 2.0 2.7 2.0 2.3 1.4

No Basement................................... 51.9 4.9 3.2 5.9 6.3 8.8 9.4 8.5 4.9

Not Asked........................................ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Attics

Attic in Single-Family Homes and

Apartments in 2-4 Unit Buildings

Yes...................................................... 22.8 4.1 1.7 2.7 2.3 3.2 2.8 3.4 2.4

No........................................................ 64.6 9.1 4.7 8.6 7.6 9.7 10.2 9.7 5.0

Not Asked (Mobile Homes or Apartment in

Buildings with 5 or More Units)............ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Finished Attic

Yes.................................................. 2.7 0.8 0.3 0.3 Q Q Q 0.4 0.4

No.................................................... 20.1 3.3 1.4 2.4 2.1 3.1 2.7 3.1 2.0

No Attic............................................ 64.6 9.1 4.7 8.6 7.6 9.7 10.2 9.7 5.0

Not Asked........................................ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Number of Finished Rooms in Attic

1...................................................... 2.2 0.6 0.3 0.3 Q Q Q 0.4 0.4

2 or More......................................... 0.5 0.2 QQQQQNQ

None (Attic Unfinished).................... 20.1 3.3 1.4 2.4 2.1 3.1 2.7 3.1 2.0

No Attic............................................ 64.6 9.1 4.7 8.6 7.6 9.7 10.2 9.7 5.0

Not Asked........................................ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Heated Attic

Yes.................................................. 1.3 0.4 QQQQQQQ

All................................................. 1.0 0.3 QQQQQQQ

Part.............................................. 0.3 QQQQQNNQ

No (Attic Not Heated)....................... 21.5 3.7 1.5 2.6 2.2 3.1 2.8 3.4 2.3

No Attic............................................ 64.6 9.1 4.7 8.6 7.6 9.7 10.2 9.7 5.0

Not Asked........................................ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Air-Conditioned Attic

Yes.................................................. 1.0 0.3 QQQQQQQ

All................................................. 0.7 QQQQQQQQ

Part.............................................. 0.3 Q Q Q N N N Q Q

No (Attic Not Cooled)....................... 21.9 3.8 1.6 2.6 2.3 3.1 2.8 3.3 2.3

No Attic............................................ 64.6 9.1 4.7 8.6 7.6 9.7 10.2 9.7 5.0

Not Asked........................................ 23.7 1.4 1.0 1.2 2.5 6.0 5.5 4.2 1.8

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables
Table HC5.2 Living Space Characteristics by Year of Construction, 2005

Living Space Characteristics

1970 to 

1979

1980 to 

1989

1990 to 

1999

2000 to 

2005

 Million U.S. Housing Units

Year of Construction

Housing 

Units 

(millions)

Before 

1940

1940 to 

1949

1950 to 

1959

1960 to 

1969

Garage/Carport

(Single-Family and Mobile Homes)

Yes.......................................................... 61.5 6.6 4.3 7.5 6.8 9.4 9.5 11.0 6.4

Attached.............................................. 41.8 1.6 1.8 3.8 4.7 6.8 7.8 9.2 6.0

1-Car Garage................................... 9.5 0.8 0.9 2.0 2.1 1.5 1.1 0.8 0.4

2-Car Garage................................... 28.4 0.7 0.8 1.8 2.6 5.1 6.2 6.6 4.6

3 or More Car Garage...................... 3.8 Q Q Q Q Q 0.6 1.8 1.0

Detached............................................. 15.2 4.6 2.2 3.0 1.1 1.6 1.1 1.3 0.3

1-Car Garage................................... 6.1 2.1 1.0 1.4 0.5 0.4 0.4 0.4 N

2-Car Garage................................... 7.8 2.2 1.1 1.3 0.5 1.1 0.6 0.7 0.2

3 or More Car Garage...................... 1.4 0.3 QQQQQQQ

Carport (only)....................................... 4.7 0.4 0.4 0.8 1.0 1.0 0.6 0.5 Q

No........................................................... 25.1 4.3 1.6 3.4 2.8 4.3 4.2 3.4 1.2

Not Asked (All Apartments)..................... 24.5 3.8 1.4 1.7 2.9 5.2 4.9 3.0 1.6

 1 Excludes floorspace in unheated garages.

 Q = Data withheld either because the Relative Standard Error (RSE) was greater than 50 percent or fewer than 10 households were sampled.

 N = No cases in reporting sample.

 Notes: ● Because of rounding, data may not sum to totals. ● See Glossary for definition of terms used in these tables.

 Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2005 

Residential Energy Consumption Survey.

Energy Information Administration

2005 Residential Energy Consumption Survey: Preliminary Housing Characteristics Tables