|Number of households by year of construction|
|1990 – 1999||2000 – 2011|
|An energy audit had been conducted in the dwelling|
|An energy audit had been conducted in the last 10 years|
|Changes made as a result of the audit|
|A government grant received as part of a home energy retrofit program|
Note:Due to rounding, the numbers may not add up and may differ slightly among tables.
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