EPC G vs EPC D: The New Real Estate Pricing Paradigm
In 2026, "Location, Location, Location" has given way to a new reality: "Diagnosis, Diagnosis, Diagnosis". Energy performance is no longer a simple comfort criterion, it's become the central element of property valuation. The price gap between a thermal sieve (G) and a renovated house (D or better) has never been so marked, creating what experts call "Green Value" or, conversely, "Thermal Discount".
Thermal Discount: A Quantified Phenomenon
According to latest Notaires de France data, the discount suffered by F or G classified properties can reach up to 18% in provinces and about 7 to 10% in Île-de-France compared to D class properties. Why? Because the 2026 buyer is an "expert buyer": they calculate their total monthly budget (loan payment + energy bill + provision for future works).
The "Bank Wall": When the Bank Decides the Sale
Today, most major banking institutions require the property to reach D class (minimum) to grant a 20 or 25-year loan. If the property is G, the banker subtracts the estimated works amount from the buyer's borrowing capacity. Without a credible RenovMatch Technical Audit, the bank will take a colossal safety margin, often causing the sale to collapse during conditional clause lifting.
Liquidity Gap: Sell Fast vs Sell "Someday"
A renovated, efficient property (Class B or C) sells on average in less than 45 days. A thermal sieve without costed renovation project can stay on market more than 6 months, suffering successive price drops that ultimately cost more than global renovation.
Case Study: 100m² House in Lyon
Scenario A: As-Is Sale (G)
- 💰 Theoretical market price: €400,000
- 📉 Real thermal discount: -€45,000
- ⌛ Observed sale delay: 120 days
- 💵 Final Net Seller: €355,000
Scenario B: Renovated (D)
- 💰 Sale price obtained: €425,000
- 🛠️ Optimized works cost: €35,000
- ⌛ Observed sale delay: 28 days
- 💵 Final Net Seller: €390,000
Net gain for seller in scenario B: +€35,000
The 3 Reasons Buyers Flee Thermal Sieves
- Energy precariousness: With heating bill potentially exceeding €5,000/year for a 120m² G class house.
- Fiscal insecurity: Thermal sieve owners fear new "carbon" taxes.
- Construction site anxiety: Buying a "project" without technical assistance is perceived as unbearable risk.
Conclusion: How Should the Seller React?
If selling a thermal sieve, realize "Quick-Wins" to reach D class or provide buyers with a Certified Technical Audit. This audit will transform buyer "fear" into "controlled project".
FAQ Thermal Sieve vs Renovated House Comparison
Is the discount the same in city vs countryside?
No. In rural areas, discount can be brutal as buyers have choice. In hyper-tight zones (Paris, Lyon), rarity limits discount but doesn't eliminate it.
Has selling a thermal sieve become illegal?
No, sale remains perfectly legal, unlike rental. But the obligation to perform a Regulatory Energy Audit for F or G house sales proves the state's transparency push.
Can the buyer sue me for "excessive consumption"?
If EPC was done in good faith by certified professional, no. Technical transparency via RenovMatch-type report is your best legal protection.