Table HC1-2a. Housing Unit Characteristics by Year of Construction,

 Million U.S. Households, 2001

Housing Unit

Characteristics

RSE Column Factor:

Total

Year of Construction

RSE

Row

Factors

1990

 to

20011

1980

to

1989

1970

to

1979

1960

to

1969

1950

to

1959

1949

or

Before

0.5 1.6 1.2 1.0 1.1 1.1 0.8

Total ............................................... 107.0 15.5 18.2 18.8 13.8 14.2 26.6 4.3

Census Region and Division

 Northeast ...................................... 20.3 1.5 2.4 2.1 2.8 3.0 8.5 8.8

 New England .............................. 5.4 0.4 0.7 0.4 0.8 0.9 2.3 11.3

 Middle Atlantic ............................ 14.8 1.1 1.7 1.7 2.0 2.2 6.2 11.2

 Midwest ......................................... 24.5 2.8 3.7 3.6 2.9 3.5 8.1 10.2

 East North Central ...................... 17.1 2.0 2.5 2.5 2.0 2.6 5.5 11.9

 West North Central ..................... 7.4 0.8 1.2 1.1 0.9 0.9 2.5 19.5

 South ............................................ 38.9 7.6 8.9 7.7 4.4 4.4 6.0 7.0

 South Atlantic .............................. 20.3 4.2 4.9 4.3 2.2 2.4 2.3 10.1

 East South Central ...................... 6.8 1.4 1.5 1.0 0.8 0.7 1.4 11.5

 West South Central ..................... 11.8 2.0 2.5 2.4 1.4 1.3 2.3 12.9

 West .............................................. 23.3 3.6 3.4 5.4 3.7 3.3 4.0 8.4

 Mountain ..................................... 6.7 1.2 0.9 1.9 0.8 0.8 1.2 17.1

 Pacific ......................................... 16.6 2.4 2.4 3.5 2.8 2.5 2.9 9.7

Metropolitan Statistical Area

 Urban ............................................ 85.5 12.0 15.2 14.8 11.6 12.0 19.9 4.8

 Central City ................................. 40.0 4.0 5.9 6.6 5.7 5.7 12.0 8.3

 Suburban .................................... 45.5 8.0 9.2 8.3 5.9 6.3 7.8 7.6

 Rural ............................................. 21.5 3.4 3.1 3.9 2.2 2.1 6.7 9.8

Climate Zone2

 Fewer than 2,000 CDD and--

 More than 7,000 HDD ................. 9.2 1.3 1.2 1.3 0.7 1.0 3.9 19.7

 5,500 to 7,000 HDD .................... 28.6 3.5 3.9 4.7 3.8 4.2 8.6 12.3

 4,000 to 5,499 HDD .................... 24.0 3.1 3.8 3.5 3.3 3.0 7.3 12.8

 Fewer than 4,000 HDD ............... 21.0 3.7 3.4 3.8 3.2 2.9 4.0 12.6

 2,000 CDD or More and --

 Fewer than 4,000 HDD ................. 24.1 3.9 5.9 5.5 2.8 3.1 2.8 11.1

Total Floorspace Category3

(square feet)

 Fewer than 500 ............................. 3.9 Q 0.6 0.7 0.7 0.4 1.3 19.4

 500 to 999 .................................... 21.8 2.1 3.8 5.3 3.0 2.5 5.1 8.5

 1,000 to 1,499 .............................. 22.7 3.4 4.1 4.3 2.9 2.8 5.1 8.9

 1,500 to 1,999 .............................. 16.6 2.2 3.0 2.6 2.1 2.4 4.4 9.5

 2,000 to 2,499 .............................. 13.5 2.1 2.3 1.9 1.7 2.2 3.2 10.4

 2,500 to 2,999 .............................. 9.3 1.2 1.3 1.4 1.3 1.4 2.7 12.4

 3,000 to 3,499 .............................. 6.9 1.2 1.3 0.9 0.7 0.9 1.9 15.6

 3,500 to 3,999 .............................. 4.1 0.8 0.6 0.6 0.5 0.4 1.2 17.4

 4,000 or More .............................. 8.2 2.3 1.2 1.0 0.8 1.1 1.8 14.0

Type and Ownership of Housing

Unit

 Single-Family Detached ................ 63.1 9.6 8.7 9.4 8.3 10.6 16.5 5.5

 Owned ........................................ 55.7 9.1 8.2 8.4 7.3 9.0 13.6 5.8

 Rented ........................................ 7.4 0.4 0.5 1.0 1.0 1.6 3.0 14.4

 Single-Family Attached ................. 10.6 1.9 2.4 1.9 1.3 0.9 2.2 16.3

 Owned ........................................ 7.5 1.5 1.8 1.2 1.0 0.7 1.4 20.0

 Rented ........................................ 3.1 0.4 0.6 0.7 0.3 0.2 0.8 21.4

 Apartments in Buildings With

 2 to 4 Units .................................... 9.5 0.5 1.6 1.3 0.9 1.1 4.1 14.5

 Owned ........................................ 2.1 Q 0.4 Q Q Q 1.2 28.7

 Rented ........................................ 7.4 0.4 1.2 1.1 0.8 1.0 2.9 15.3

 Apartments in Buildings With

 5 or More Units ............................. 17.0 1.5 3.5 4.3 2.7 1.4 3.6 11.8

 Owned ........................................ 1.8 Q 0.6 0.5 0.4 Q Q 38.0

 Rented ........................................ 15.2 1.5 2.9 3.8 2.3 1.2 3.4 11.9

 Mobile Homes ............................... 6.8 2.0 2.0 1.8 0.6 Q Q 15.1

 Owned ........................................ 5.7 1.9 1.6 1.5 0.5 Q Q 16.1

 Rented ........................................ 1.1 Q 0.4 0.3 Q Q Q 27.7

See footnotes at end of table.

Energy Information Administration

2001 Residential Energy Consumption Survey: Housing Characteristics Tables
Table HC1-2a. Housing Unit Characteristics by Year of Construction,

 Million U.S. Households, 2001 (Continued)

Housing Unit

Characteristics

RSE Column Factor:

Total

Year of Construction

RSE

Row

Factors

1990

 to

20011

1980

to

1989

1970

to

1979

1960

to

1969

1950

to

1959

1949

or

Before

0.5 1.6 1.2 1.0 1.1 1.1 0.8

Ownership of Unit

 Owned .......................................... 72.7 12.5 12.7 11.8 9.2 10.1 16.4 5.0

 Rented .......................................... 34.3 2.9 5.5 7.0 4.5 4.1 10.2 7.4

Year of Construction

 1939 or Before .............................. 19.0 -- -- -- -- -- 19.0 7.5

 1940 to 1949 ................................. 7.6 -- -- -- -- -- 7.6 11.0

 1950 to 1959 ................................. 14.2 -- -- -- -- 14.2 -- 6.1

 1960 to 1969 ................................. 13.8 -- -- -- 13.8 -- -- 6.2

 1970 to 1979 ................................. 18.8 -- -- 18.8 -- -- -- 5.9

 1980 to 1989 ................................. 18.2 -- 18.2 -- -- -- -- 5.9

 1990 to 1999 ................................. 14.5 14.5 -- -- -- -- -- 9.0

 2000 to 20011 ............................... 0.9 0.9 -- -- -- -- -- 19.9

Urban/Rural Location4

 City ................................................ 49.9 5.4 6.7 8.8 6.9 7.1 15.0 6.5

 Town ............................................. 18.0 1.9 2.9 2.9 2.4 2.4 5.4 10.6

 Suburbs ........................................ 21.2 4.5 5.1 3.5 2.6 3.0 2.5 10.4

 Rural or Open Country .................. 17.9 3.7 3.5 3.5 1.9 1.6 3.6 10.5

Total Number of Rooms

(Excluding Bathrooms)

 1 or 2 ............................................. 2.6 Q 0.4 0.4 0.5 0.2 0.9 26.7

 3 ................................................... 9.2 0.8 1.7 2.0 1.5 0.8 2.4 13.9

 4 ................................................... 19.0 1.9 3.8 4.1 2.3 2.0 4.8 8.9

 5 ................................................... 22.2 3.3 3.7 3.4 2.9 3.3 5.6 8.5

 6 ................................................... 23.0 2.8 3.9 3.7 2.8 4.1 5.7 7.7

 7 ................................................... 14.0 2.2 2.0 2.4 2.0 2.0 3.4 9.3

 8 ................................................... 9.8 2.3 1.8 1.6 1.1 1.1 2.0 12.5

 9 or More ...................................... 7.2 2.0 1.0 1.0 0.7 0.6 1.8 15.4

Bedrooms

 None or 1 ...................................... 13.6 0.9 2.2 2.5 2.2 1.1 4.6 12.5

 2 .................................................... 29.5 2.6 5.4 5.9 3.3 3.8 8.5 7.6

 3 .................................................... 44.1 7.8 7.4 7.1 5.8 6.7 9.3 6.5

 4 or More ...................................... 19.8 4.1 3.1 3.3 2.5 2.5 4.3 9.1

Other Rooms

(Excluding Bathrooms)

 None or 1 ...................................... 4.2 0.6 0.8 0.8 0.5 0.5 1.0 18.6

 2 .................................................... 39.4 5.2 7.0 7.9 5.9 4.9 8.6 6.4

 3 .................................................... 35.0 4.1 6.0 5.5 4.2 5.3 10.0 6.8

 4 .................................................... 18.4 2.9 2.9 3.1 2.4 2.6 4.4 9.5

 5 or More ...................................... 10.0 2.7 1.5 1.5 0.8 0.9 2.6 13.0

Full Bathrooms

 None or 1 ...................................... 58.5 3.0 7.0 9.9 8.3 9.3 21.0 5.8

 2 .................................................... 41.2 9.9 9.6 7.6 4.9 4.4 4.8 6.6

 3 or More ...................................... 7.3 2.6 1.6 1.2 0.5 0.5 0.8 17.5

Half Bathrooms

 None ............................................ 76.6 9.4 12.0 14.1 9.7 10.4 21.0 4.3

 1 .................................................... 27.9 5.5 5.9 4.2 3.9 3.4 5.0 7.8

 2 or More ...................................... 2.5 0.6 0.4 0.5 0.2 0.3 0.5 23.8

See footnotes at end of table.

Energy Information Administration

2001 Residential Energy Consumption Survey: Housing Characteristics Tables
Table HC1-2a. Housing Unit Characteristics by Year of Construction,

 Million U.S. Households, 2001 (Continued)

Housing Unit

Characteristics

RSE Column Factor:

Total

Year of Construction

RSE

Row

Factors

1990

 to

20011

1980

to

1989

1970

to

1979

1960

to

1969

1950

to

1959

1949

or

Before

0.5 1.6 1.2 1.0 1.1 1.1 0.8

Number of Stories

 Single-Family Homes .................... 73.7 11.5 11.1 11.3 9.6 11.5 18.7 5.1

 1 Story ........................................ 44.2 6.0 5.8 8.0 7.4 8.6 8.3 6.2

 2 Stories ...................................... 26.4 5.2 4.7 2.5 1.7 2.5 9.7 9.2

 3 or More Stories ........................ 1.6 Q 0.2 0.3 Q Q 0.6 26.0

 Split-Level ................................... 1.3 Q 0.3 0.4 0.3 Q Q 29.7

 Other ........................................... Q Q Q Q Q Q Q NF

 Apartments in Buildings With

 2 to 4 Units .................................... 9.5 0.5 1.6 1.3 0.9 1.1 4.1 14.5

 1 Story ........................................ 4.5 0.3 0.9 0.8 0.6 0.5 1.4 19.7

 2 Stories ...................................... 3.9 Q 0.6 0.5 0.3 0.5 1.9 19.5

 3 or More Stories ........................ 1.1 Q Q Q Q Q 0.8 33.1

 Split-Level ................................... Q Q Q Q Q Q Q NF

 Other ........................................... Q Q Q Q Q Q Q NF

 Mobile Homes ............................... 6.8 2.0 2.0 1.8 0.6 Q Q 15.1

Number of Floors for Apartments

in Buildings With 5 or More Units 17.0 1.5 3.5 4.3 2.7 1.4 3.6 11.8

 1 or 2 Floors ................................ 8.9 0.7 2.6 2.4 1.3 0.7 1.1 17.1

 3 or 4 Floors ................................ 4.7 0.8 0.4 1.3 0.5 0.3 1.4 24.6

 5 to 10 Floors .............................. 2.4 Q 0.4 0.3 0.6 0.3 0.8 26.8

 11 to 20 Floors ............................ 0.9 Q Q Q 0.3 Q 0.3 34.5

 More than 20 Floors .................... Q Q Q Q Q Q Q NF

Foundation/Basement of

Single-Family Homes and

Apartments in Buildings With

2 to 4 Units (More than one may

apply)

 Basement ...................................... 39.1 4.8 4.4 4.4 4.7 6.2 14.6 7.6

 Crawlspace ................................... 24.2 2.7 2.6 3.0 3.2 4.5 8.1 9.5

 Concrete Slab ............................... 29.5 5.2 6.8 6.6 3.8 4.0 3.2 8.4

 Not Asked (Mobile Homes and 

 Apartments in Buildings With 

 5 or More Units) ............................ 23.8 3.5 5.5 6.1 3.3 1.6 3.8 9.5

Heated Basement in

Single-Family Homes and

Apartments in Buildings

With 2 to 4 Units

 Yes ................................................ 28.3 3.9 3.2 3.3 3.7 4.5 9.7 8.6

 All ................................................ 22.1 3.2 2.7 2.6 2.9 3.6 7.1 9.2

 Part ............................................. 6.2 0.7 0.5 0.7 0.8 0.9 2.6 15.9

 No ................................................. 10.8 1.0 1.2 1.1 1.0 1.6 5.0 12.6

 No Basement ................................ 44.0 7.1 8.3 8.3 5.8 6.5 8.2 6.9

 Not Asked (Mobile Homes and 

 Apartments in Buildings With

 5 or More Units) ............................ 23.8 3.5 5.5 6.1 3.3 1.6 3.8 9.5

Attic in Single-Family Homes

and Apartments in Buildings

With 2 to 4 Units

 Yes ................................................ 24.6 4.1 4.0 3.0 2.7 3.4 7.4 10.4

 Finished ...................................... 3.5 0.4 0.4 0.3 0.4 0.5 1.6 23.5

 Unfinished ................................... 21.1 3.7 3.6 2.7 2.3 3.0 5.8 11.0

 No Attic ......................................... 58.6 7.9 8.7 9.7 7.8 9.2 15.4 5.6

 Not Asked (Mobile Homes and 

 Apartments in Buildings With 

 5 or More Units) ............................ 23.8 3.5 5.5 6.1 3.3 1.6 3.8 9.5

See footnotes at end of table.

Energy Information Administration

2001 Residential Energy Consumption Survey: Housing Characteristics Tables
Table HC1-2a. Housing Unit Characteristics by Year of Construction,

 Million U.S. Households, 2001 (Continued)

Housing Unit

Characteristics

RSE Column Factor:

Total

Year of Construction

RSE

Row

Factors

1990

 to

20011

1980

to

1989

1970

to

1979

1960

to

1969

1950

to

1959

1949

or

Before

0.5 1.6 1.2 1.0 1.1 1.1 0.8

Heated Attic in Single-Family

Homes and Apartments in

Buildings With 2 to 4 Units

 Yes ................................................ 4.5 0.6 0.6 0.4 0.4 0.6 1.8 19.5

 Fully Heated ................................ 2.7 0.4 0.4 0.2 0.2 0.3 1.1 24.1

 Partially Heated .......................... 1.8 Q Q Q Q 0.3 0.7 24.9

 Attic Not Heated ............................ 20.1 3.4 3.4 2.6 2.3 2.8 5.6 11.1

 No Attic ......................................... 58.6 7.9 8.7 9.7 7.8 9.2 15.4 5.6

 Not Asked (Mobile Homes and 

 Apartments in Buildings With

 5 or More Units) ............................ 23.8 3.5 5.5 6.1 3.3 1.6 3.8 9.5

Garage/Carport

(single-family and mobile homes)

 Yes ................................................ 58.4 10.3 9.7 9.6 7.9 8.6 12.2 5.7

 Attached ...................................... 37.1 8.7 7.6 7.2 5.7 4.9 3.1 7.9

 1-Car Garage ............................ 10.8 1.3 1.6 1.8 1.7 2.4 1.9 14.9

 2-Car Garage ............................ 24.1 5.8 5.7 5.2 3.9 2.3 1.2 9.5

 3 or more Car Garage ............... 2.3 1.6 0.3 Q Q Q Q 21.5

 Detached .................................... 17.0 1.4 1.4 1.3 1.5 3.0 8.4 11.7

 1-Car Garage ............................ 6.9 Q 0.4 0.6 0.7 1.2 3.8 15.5

 2-Car Garage ............................ 8.7 1.0 0.7 0.6 0.7 1.6 4.0 14.7

 3 or more Car Garage ............... 1.4 0.2 0.3 Q Q Q 0.5 27.4

 Carport (only) .............................. 4.2 Q 0.7 1.1 0.7 0.8 0.7 20.2

 No ................................................. 22.1 3.2 3.4 3.5 2.2 3.0 6.8 10.0

 Not Asked (Apartments) ............... 26.5 2.0 5.1 5.6 3.6 2.5 7.7 9.1

Fuels Used For Any Use

(more than one often used)

 Electricity ...................................... 107.0 15.5 18.2 18.8 13.8 14.2 26.6 4.3

 Natural Gas ................................... 66.9 9.4 8.8 9.0 9.5 10.3 20.0 5.9

 Wood ............................................ 14.5 2.0 3.0 3.2 2.0 1.7 2.5 9.9

 Fuel Oil ......................................... 8.7 0.3 0.5 0.9 1.3 1.8 3.9 15.5

 LPG ............................................... 9.4 1.4 1.5 1.7 1.1 1.0 2.6 13.9

 Kerosene ...................................... 2.9 0.4 0.3 0.7 0.4 0.3 0.8 20.8

 Solar ............................................ 1.1 Q 0.2 Q 0.3 0.2 Q 30.6

Main Heating Fuel

 Natural Gas ................................... 59.3 8.6 7.4 7.8 8.5 9.3 17.8 6.4

 Electricity ...................................... 31.1 5.6 9.0 8.4 3.0 2.3 2.8 8.2

 Fuel Oil ......................................... 8.0 0.2 0.4 0.8 1.1 1.8 3.7 15.7

 LPG ............................................... 5.0 0.8 0.9 0.8 0.6 0.4 1.5 19.2

 Wood ............................................ 2.0 0.1 0.4 0.5 0.3 0.2 0.6 24.5

 Kerosene ...................................... 0.8 Q Q 0.3 Q Q Q 29.9

 Solar ............................................. Q Q Q Q Q Q Q NF

 Other/None ................................... 0.7 Q Q Q 0.2 0.2 Q 28.7

Natural Gas Available in

Neighborhood

 Yes ................................................ 77.7 10.8 10.9 11.6 10.6 11.5 22.3 5.3

 No ................................................. 29.3 4.6 7.3 7.1 3.2 2.7 4.3 8.7

1 New construction for 2001 includes only those housing units built and occupied between January and the April-August period when the household interviews were

conducted. 2 One of five climatically distinct areas, determined according to the 30-year average (1961-1990) of the annual heating and cooling degree-days. For this report, the

heating or cooling degree-days are a measure of how cold or how hot a location is over a period of one year, relative to a base temperature of 65 degrees Fahrenheit. 

A household is assigned to a climate zone according to the 30-year average annual degree-days for an appropriate nearby weather station. 3 Does not include floorspace for unheated garages. 4 Based on the household respondent’s description rather than the Federal Government definition.

-- = Data not applicable.

NF = No applicable RSE row factor.

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

Notes: • To obtain the RSE percentage for any table cell, multiply the corresponding column and row factors. • Because of rounding, data may not sum to totals. • See

"Glossary" for definition of terms used in this report.

Source: Energy Information Administration, Office of Energy Markets and End Use, Forms EIA-457 A, B, C of the 2001 Residential Energy Consumption Survey.

Energy Information Administration

2001 Residential Energy Consumption Survey: Housing Characteristics Tables