DPE energy ratings in France: how they affect property value in 2026

The French energy rating system, the January 2026 reform that shifted nearly a million properties up a band, and what the rating actually does to sale prices.

Updated May 2026. No agent ever pays us anything.

If the DPE letter on a listing has been confusing you, this page demystifies it. The rating drives meaningful price differences, the regulatory regime is tightening, and the January 2026 reform changed how some properties are scored without anyone touching them. Worth understanding before you offer.

The short answer

The DPE (Diagnostic de Performance Énergétique) is the mandatory French energy rating, a letter from A (best) to G (worst) assigned to every property at sale or letting. It affects price materially: per Notaires de France’s 2025 valeur verte study, A or B properties sell at meaningful premiums over D equivalents (the figure varies by property type, with apartments typically showing larger premiums than houses), and G-rated passoires thermiques sell at substantial discounts. As of January 2026, France changed how DPE is calculated for electric-heated properties, with the prime minister’s office estimating that 700,000 to 850,000 homes would move up a band without any actual change in their efficiency. If you’re evaluating a property in 2026, the DPE on the listing may have been recalculated since the original certificate was issued.

This page covers what the DPE is, the 2026 reform, what it does to sale prices, the rental-ban implications, and how to think about a poor DPE on a listing you’re considering.

What the DPE actually is

The DPE is a standardised energy assessment of a building, performed by a certified diagnostician (diagnostiqueur), valid for ten years from the date of the certificate. It must be provided to the buyer (or tenant) before any sale or let.

The certificate produces two letter grades:

DPE letter (energy consumption): A (most efficient) to G (least efficient), based on kWh per square metre per year of primary energy.
GES letter (greenhouse-gas emissions): A to G, on kg CO2 equivalent per square metre per year.

The letter that gets quoted in listings and that drives the price impact is the energy DPE. The GES letter shows up in the certificate but rarely in marketing.

The boundary between bands is in kWh/m²/year of primary energy:

Band	Primary energy (kWh/m²/year)
A	< 70
B	70 to 110
C	110 to 180
D	180 to 250
E	250 to 330
F	330 to 420
G	> 420

The bands work the same way across regions, though heating load and ventilation requirements vary considerably between, say, a stone mas in the Gard and an apartment in Lille. The DPE doesn’t adjust for climate; an A-rated property in the cold north and an A-rated property in the warm south are both genuinely efficient but used different baselines to get there.

The January 2026 reform

The headline change in 2026: France lowered the conversion factor for electricity from 2.3 to 1.9, effective 1 January 2026.

Background: the DPE measures primary energy, not the energy delivered to the meter. For most fuels (gas, oil, wood), the conversion factor is 1.0. For electricity, the historical conversion factor was 2.3, reflecting the energy losses in generation and transmission averaged across the European grid. Because France generates most of its electricity from nuclear and renewables (with materially less primary-energy waste than the European average), the 2.3 number was over-stating the primary-energy footprint of French electrically-heated homes.

The reform corrected this. From January 2026, electricity is converted at 1.9 instead of 2.3. The effect is mathematical: an electrically-heated home that consumed 200 kWh/m²/year of delivered electricity was previously rated at 460 kWh/m²/year of primary energy (a G). After the reform, the same home is rated at 380 kWh/m²/year (an F).

Scale of the effect, per the Notaires de France and the prime minister’s office:

Roughly 850,000 homes moved up a band as a result.
Most of these are small apartments with electric heating, predominantly in cities.
A property previously labelled F or G on its existing certificate can be re-issued at the new rating without a fresh inspection, free of charge, via the ADEME platform.

What this means in practice for buyers in 2026:

A listing showing DPE F may have been G on its original certificate and only recently shifted up. The energy efficiency hasn’t changed; the scoring system did.
A property that was unrentable as a passoire thermique at G may now be rentable as F, depending on rental-ban deadlines (covered below).
The market is still pricing as if the old labels held; the price impact of the 2026 reform is not yet fully absorbed and will continue to play out through 2026-2027.

The DPE’s price impact (sourced numbers)

Notaires de France publishes regular analysis of the price impact of DPE on residential transactions. From their 2025 valeur verte study covering 2024 transactions:

For houses:

A or B-rated houses: sell for between 6% and 14% more than D-rated equivalents in the same market.
C-rated: small premium over D.
E-rated: around 9% discount versus D in 2025 data.
G-rated (passoires thermiques): up to 25% discount versus D, the so-called “decote brune” or “brown discount.”

For apartments:

A-rated: around 16% premium over D in 2024 transactions.
B-rated: around 12% premium.
C-rated: around 6% premium.
E-rated: around 4% discount versus D in 2025 data.
G-rated: around 12% discount versus D in 2024 data.

These are national averages and vary by region. The price gap is wider in cooler regions (where heating costs dominate) and narrower in warmer regions. The Notaires de France headline summary: each energy class lower represents on average around an 8% reduction in the value of a French house.

The mechanism is straightforward. A G-rated house costs more to heat, requires renovation to bring up to a rentable standard under current and upcoming regulations, and is harder to sell in five or ten years if regulation continues to tighten. Buyers price all of this in.

Rental ban implications

The DPE isn’t just informational. It carries legal consequences for landlords, and those consequences cascade to property values.

The loi Climat et Résilience (the 2021 climate law) introduced phased rental bans on energy-inefficient properties:

From 2023: G+ properties (the worst G) cannot be re-let to a new tenant.
From 2025: G properties cannot be re-let.
From 2028: F properties cannot be re-let.
From 2034: E properties cannot be re-let.

The bans apply to new tenancies; existing tenancies can continue. But once a tenant leaves, a banned property cannot be re-let to a new tenant until renovated above the threshold.

For investment buyers, this is decisive. A G-rated property bought in 2026 cannot be re-let when the current tenant leaves; you must renovate it to F or above before re-letting. The renovation cost (typically €40,000 to €80,000 for a small G-to-D upgrade, more for major work) needs to be priced into your offer.

For owner-occupier buyers, the bans don’t directly apply, but resale is affected. A G-rated property is harder to resell because the next buyer faces the same renovation calculus.

How to think about a poor DPE

When you see a DPE F or G on a listing you’re considering, ask three questions:

1. Was the certificate issued before January 2026? If so, the same property might receive an F or even E rating under the new calculation. The ADEME platform allows free re-issuance with the new method. The seller (or you, after purchase) can request this.

2. What renovation would lift the rating? Not all DPE F properties are equally hard to fix. The bottlenecks are usually insulation (wall, roof, floor), heating system (replacing oil or old electric with heat pumps), and ventilation. A diagnostic audit énergétique costs €500 to €800 and identifies the specific gaps. For F to D, expect €30,000 to €60,000 of work; for G to D, €50,000 to €100,000 depending on the property. State subsidies (MaPrimeRénov, Éco-prêt à taux zéro) can offset part of the cost for principal residences; MaPrimeRénov is unavailable for second homes.

3. Does the asking price already reflect the renovation cost? The market typically discounts G-rated properties by 18 to 25%, which often roughly covers a substantial chunk of the renovation cost. If the asking price hasn’t been discounted accordingly, that’s negotiating room. The Adresse.ai report flags this explicitly when the asking price is high relative to the comp pool and the DPE is poor: it’s a renovation-cost-shaped issue surfacing as an apparent overpricing.

A worked example

A buyer is evaluating a stone village house in the Gard, asking €295,000. Listing details:

130m² habitable.
DPE: F (issued 2024).
GES: E.
Heating: oil-fired boiler installed 2008.

The Adresse.ai report:

Adjusted comp pool of 19 properties in the village within the last 5 years.
The comp pool’s median DPE is D.
After adjusting comparables down to F-equivalent (using the 11% F-versus-D discount), the adjusted comp range is €265,000 to €315,000, midpoint €290,000.
Verdict: asking price is roughly fair for the DPE F as listed. But the certificate was issued in 2024 under the old electricity coefficient, and although this property has oil heating (not electric, so not directly affected), the qualitative review notes that any future buyer doing a full audit énergétique will be evaluating the property under post-2026 metrics.
The renovation calculus: replacing the oil boiler with a heat pump and adding wall insulation would likely lift the property from F to D, costing €40,000 to €60,000. MaPrimeRénov would offset around €15,000 to €20,000 of that.

The negotiation framing: open at €265,000 (10% below asking), justified by the F-rated comp pool position and the renovation cost. Acceptable target: €275,000 to €280,000.

What this means for you

If you’re evaluating a property in 2026:

Look at the DPE letter and the certificate date. A certificate issued before January 2026 may understate the property’s current rating.
For F or G ratings, model the renovation cost into your offer.
For investment buyers, factor in the rental-ban timing.
For owner-occupier buyers, factor in resale implications.
A B-rated property carries a price premium today that is likely to widen as energy prices rise and the regulation continues to tighten. The premium is real, not theoretical.

The Adresse.ai report integrates DPE into every estimate. Comparables are adjusted up or down based on the rating, the report flags when the asking price doesn’t reflect the rating, and the AI auditor calls out the renovation calculus when the DPE is poor.

Questions

Is a DPE valid forever?

No. A DPE is valid for 10 years from issue. Certificates issued before 1 July 2021 had different methodology and are no longer valid; if a listing relies on a pre-2021 DPE, the seller is required to commission a new one before sale.

Can I trust the DPE on the listing?

Mostly. The certificate is issued by a state-certified diagnostiqueur, with legal liability for accuracy. That said, certificates have been criticised for inconsistency between diagnosticians, particularly around insulation assessment and ventilation modelling. For a major purchase, commissioning your own audit énergétique (more thorough than the DPE) is a reasonable extra spend.

What does the GES letter mean and should I care?

The GES is the greenhouse-gas-emissions letter on the same certificate. It tracks closely with the DPE letter for properties heated by gas, oil, or wood (which produce CO2 directly), and diverges for electrically-heated properties (where the CO2 footprint depends on grid mix, very low in France). The GES rarely affects sale price independently; the DPE is the operative letter.

What happens if I buy a G-rated property as a primary residence?

You can live in it indefinitely. The rental ban applies only to letting, not to owner-occupation. But your eventual resale will face the same DPE-driven discount that you negotiated on the way in, unless you renovate.

Will all G-rated properties become unsellable?

No. They become harder to sell at the asking price, but they continue to trade. The market clears at the discounted price. The buyers who are willing to take on the renovation are out there; you’re one of them if you’re reading this and thinking about it.

Does the DPE affect the droits de mutation?

No, the transfer tax is calculated on sale price, not on energy rating. The DPE affects the price you pay (through market discounting), not the percentage tax on top of it.

Can I get a mortgage on a G-rated property?

Yes, but increasingly with conditions. Some French banks now require an energy-renovation plan as part of the mortgage approval for properties rated F or G, especially for investment loans. You may also face higher rates or lower LTV than for an equivalent D-rated property. Talk to your broker before assuming financing will work the same way.

Try it on your listing

The Adresse.ai report integrates the DPE into every estimate, and the qualitative review flags the renovation calculus when the rating is poor.

Run an estimate →