A property renovated by a certified RGE craftsman is valued differently than a property refreshed by a generalist company without qualification. The difference lies in three areas: the regulatory compliance of the DPE, the insurance coverage of the work, and the buyer’s perception during the visit. Understanding these mechanisms allows for targeting interventions that generate real added value and avoiding those that strain the budget without measurable return.
Electricity conversion coefficient and new DPE: what changes for valuation
The calculation of the energy performance diagnosis was modified on January 1, 2026. The decree of August 13, 2025, published in the Official Journal on August 26, 2025, lowered the electricity conversion coefficient from primary energy from 2.3 to 1.9. In practical terms, a home heated by electricity can gain one or even two energy classes without any physical work.
The relevant diagnostics can be updated for free via the ADEME DPE-Audit Observatory, without a new visit from the diagnostician. We recommend checking the current class before undertaking an energy renovation: a property rated E with electric heating can shift to D through simple recalculation, making certain insulation work unnecessary from a regulatory standpoint.
This recalculation has a direct impact on the depreciation at resale. Market analyses show that the depreciation related to thermal sieves remains significant, but a free reclassification to a better letter eliminates or reduces this penalty without mobilizing a work budget. Therefore, before contacting a craftsman, it is essential to check the existing DPE.
Professionals involved in real estate with Cœur Artisan incorporate this preliminary diagnosis into their project methodology, which avoids unnecessary work and concentrates the budget on truly valuable items.
Rental energy renovation: prohibition schedule and recalibrated aids
Since January 1, 2025, properties rated G no longer meet the energy decency criteria during a new rental, renewal, or tacit extension of the lease. Class F properties will be affected starting in 2028, and class E properties starting in 2034. For a rental investor, renovating is no longer an option for valuation but a legal condition for operation.
The MaPrimeRénov’ scheme has been significantly refocused. Since September 1, 2026, insulation work by gesture (insulation alone, without a bundle) is excluded from the scheme for both landlords and occupants. The ANAH now directs funding towards comprehensive renovations, which changes the project logic.
Consequences on the choice of craftsmen
An RGE craftsman remains necessary to access the remaining aids. The RGE qualification covers specific areas (attic insulation, heat pump installation, joinery). An “RGE generalist” craftsman does not exist: each mention corresponds to a specific audited technical scope. Checking the exact mention before signing a quote avoids unpleasant surprises at the time of submitting the aid application.
- Check the validity and exact scope of the RGE qualification on the official site france-renov.gouv.fr before any contractual commitment.
- Favor a comprehensive renovation (insulation, ventilation, heating) rather than an isolated gesture, to remain eligible for aids post-September 2026.
- Require a prior energy audit for individual homes rated E, F, or G, which has been mandatory at the time of sale since January 1, 2025.
Mandatory energy audit: actual scope and common pitfalls
The mandatory energy audit at the time of sale does not apply to all properties. It applies to individual homes and entire buildings in single ownership rated E, F, or G. Lots sold separately in co-ownership are exempt from this obligation, with only the classic DPE being required. We regularly observe sellers of co-owned lots ordering an unnecessary audit, mobilizing a budget of several hundred euros without legal obligation.
The audit prescribes a multi-step work pathway, with performance objectives to be met. The craftsmen performing the work must adhere to these recommendations for the audit to remain consistent with the final DPE. A discrepancy between the initial audit and the work actually performed can lead to a buyer’s dispute after the sale.
Linking audit and quotes
The audit identifies priority areas but does not quantify the work. The seller must then obtain quotes from qualified craftsmen for each area. The consistency between the audit recommendations and the quotes presented to the buyer constitutes a strong selling point. A complete file (audit, detailed quotes, RGE certificates) shortens negotiation times.
Valuation work outside energy: areas to arbitrate
Energy renovation monopolizes regulatory attention, but other areas directly influence the selling price. Buyers react strongly to three visual elements: the condition of the bathroom, the kitchen, and the interior joinery.
The bathroom remains the area with the best cost/perception ratio for the buyer. A replacement of tiles, a walk-in shower, and contemporary faucets transform the overall impression without touching the structural work. The kitchen follows the same logic, but the budget is higher and the return less predictable if the buyer’s tastes diverge.
- Bathroom: a high visual perception area, manageable budget, suitable for small and medium-sized properties.
- Kitchen: variable return depending on the local market, favor a refresh (countertop, backsplash) rather than a complete replacement.
- Interior joinery (doors, baseboards, moldings): a signal of overall maintenance quality, often overlooked in energy-focused renovations.
- Floor coverings: a sanded parquet or large-format tiles modernize the space at a lower cost compared to redistributing partitions.
The choice of a specialized craftsman for each area (plumber, carpenter, tiler) produces a result superior to that of a general contractor that outsources. The professional qualification guarantees mastery of the task and compliance with applicable DTUs.
Real estate valuation through renovation relies on precise sequencing: check the DPE, recalculate if the property is heated by electricity, then target the legally necessary areas before the aesthetic ones. A poorly allocated budget between energy and visual comfort reduces overall return. The qualified craftsman intervenes at each stage, but it is the initial diagnosis that determines the relevance of each euro invested.
