5.1 - ENERGY AUDIT
  Number of households by year of construction
1950 – 1969 1970 – 1979 1980 – 1989
An energy audit had been conducted in the dwelling
Yes 367,008 A 463,777 M 349,903 A
No 1,852,101 A 1,875,739 A 1,873,407 A
Don't know 110,495 M 190,737 M 159,861 M
Not stated 222,475 M U U
An energy audit had been conducted in the last 10 years
Yes 324,698 A 428,355 M 323,456 A
No U U U
Don't know U U U
Not stated 332,970 M 318,530 M 266,295 M
Changes made as a result of the audit
Yes 252,972 A 319,898 M 275,131 A
No 107,271 M 139,542 M 74,379 M
Don't know U U U
Not stated 332,970 M 318,530 M 266,295 M
A government grant received as part of a home energy retrofit program
Yes 204,181 A 201,676 M 172,730 A
No 132,193 A 225,504 M 144,183 M
Don't know U U U
Not stated 332,970 M 318,530 M 266,295 M

Note:

Due to rounding, the numbers may not add up and may differ slightly among tables.

Legend:

The letter beside each estimate classifies its quality as follows: A–Acceptable, M–Use with caution, U–Too unreliable to be published.

Source:

2011 Survey of Household Energy Use