Social · Effy · ADEME aggregates · 98 departments · energy classes A–G · 2025 snapshot.
Housing: 9% thermal sieves in diagnosed stock, up to 13% in Bourgogne
About 9% of homes with a recent EPC are rated F or G. National map from the public ADEME register (2025 snapshot).
National EPC class breakdown (diagnosed stock)
National breakdown of EPC energy classes
Data details
Recorded EPCs (France)
3.13 M
Department sum · ADEME register via Effy
Thermal sieves (F + G)
9.2 %
289k homes · energy rating
Classes C + D (majority)
67.9 %
Mid-range performance · partial renovation
Highest regional F/G rate
Bourgogne-Franche-Comté · 13.0 %
Bourgogne-Franche-Comté · 13.0%
Key facts
- Among 3.1 million recorded EPCs, 289k homes are rated F or G (9.2%), i.e. thermal sieves.
- Classes C and D account for 67.9% of the diagnosed stock (1.2M and 1.0M EPCs).
- Territorial gap: Provence-Alpes-Côte d'Azur (4.9% F/G) vs Bourgogne-Franche-Comté (13.0%) among mainland regions.
- Source: Effy department aggregates (public ADEME register, 2025 snapshot) · no time series.
Thermal sieves: diagnosed housing stock in France
The Energy Performance Certificate (EPC / DPE) rates homes from A (highly efficient) to G (very poor). Classes F and G are thermal sieves: hard to heat and cool, with high bills for low-income households.
F/G · Thermal sieves
Thermal sieves
"1 in 11 diagnosed homes rated F or G"
Among EPCs recorded in the public ADEME register, about 9% of homes are rated F or G on the energy scale.
Regulation aims for a progressive ban on letting thermal sieves (G from 2025, F in 2028, E in 2034 for some rentals).
A→G · Class distribution
Class distribution
"C + D = 68% of diagnosed stock"
Classes C (37%) and D (31%) alone account for nearly two thirds of the stock covered by a recent EPC.
Homes rated A and B remain a minority (7% combined), reflecting an ageing stock where renovation is slow.
Why multiple series?
Why does Bourgogne-Franche-Comté show the highest thermal-sieve rate while Île-de-France is densely populated? Old stone stock, a continental climate and slower renovation push up F/G shares in eastern and central France, while the south and west have more recent or upgraded housing (mostly C/D).
Analogy: the EPC is a home's « energy logbook ». Like a car rating, it measures intrinsic building performance (insulation, heating, ventilation), not day-to-day usage.
What this is not
- This dataset counts issued EPCs (sales, rentals, works), not the full French housing stock (≈ 37 million primary residences).
- Department aggregates republished by Effy from the ADEME register · not an official ADEME release.
- No time series in this version: 2025 snapshot, not an annual trend.
Thermal sieve rate (F/G) by region (%)
What these figures do not show
EPCs issued and recorded in the ADEME register (sales, rentals, works), aggregated by department then summed. Does not cover the entire French housing stock. No historical time series in this version.
Sources
Observatoire Effy des DPE · répartition région/départementEffy (agrégats ADEME) · 2026-05-29