Reader question: Our French home is an old stone building so scores low on DPE ratings but our heating bill is low as the property retains heat. Are bills not taken into account as it seems unfair if not?
The new diagnostic de performance énergétique (DPE) looks at theoretical and not actual energy usage.
It is a system based on building standards first imposed in the 1970s, and so does not adapt well to old stone properties where the thickness of walls and orientation of the house play a key role in keeping the inside warm in winter and cool in summer.
Heritage groups have alerted the government to problems with the system but little has changed.
The DPE technician fills out an online form, which has algorithms giving good scores for things like wall insulation, but which does not take into account wall width or orientation.
Receipts for insulation, double glazing and plumbing work are included – but not DIY projects unless purchase receipts can be matched to specific jobs, such as attic insulation.
DPEs are important for landlords as the government has banned properties with the lowest scores from rental.
For sales, they have no legal force.
Note though too that, since April this year, a mandatory ‘energy audit’ is required when selling a poorly-insulated French home (F or G rating) and should be shown to prospective buyers when they visit the property.
The document will suggest the work needed to raise the energy category, although carrying out the improvements is not necessary for the sale.
These new regulations on audits were originally planned for September 2022, but were pushed back to April 2023.
If a potential buyer uses the DPE or an energy audit to demand a lower price, you can of course always produce actual energy bills to explain why your house is a good buy regardless of what the ratings and audit shows.