On 1 January 2025, 600,000 dwellings rated G exited the private rental market under article L.173-1-1 of the French Construction and Housing Code (CCH). Three million nine hundred thousand dwellings rated F or G still need to be renovated in the private rental stock (ADEME, November 2024) — and the next deadline, the ban on F-rated rentals on 1 January 2028, leaves only twenty usable months to buy, renovate and resell. On this segment, the average discount at purchase reaches 25% on houses and 12% on apartments compared with an equivalent D-rated property (Notaires de France, 2025 annual real estate report).
For a property dealer (marchand de biens — French BIC tax status under CGI article 35 I 1°) or a structured investor, the 2026 — first-half 2028 window remains the most profitable in the French real estate cycle since the 2008 bubble burst. But you must buy the right type of property, prioritise the right renovation work, mobilise the subsidies actually accessible to your legal structure, and capture green value at resale. This article details each link in the chain.
On a G-rated 100 m² house in Le Mans bought for €165,000, renovated to D for €50,000 and resold at €245,000, the gross margin reaches €42,000 (+21%) in twelve to eighteen months — provided that the legal structure, renovation bundle and VAT-on-margin treatment have been framed from the outset.
What this article covers
The rental ban schedule from the Climate & Resilience Act, the typical profile of the property to buy to maximise the purchase discount, the cost/DPE-class gain ratio of the main renovation actions in 2026, the matrix of subsidies actually accessible depending on your legal status (property dealer, SCI taxed under personal income, SCI taxed under corporate tax, individual landlord), a fully costed case study on a realistic property, and the four tax pitfalls that destroy net margin.
The 2025-2034 rental ban schedule and the 2026 DPE reform
The Climate & Resilience Act of 22 August 2021 (law no. 2021-1104) introduced into the French Construction and Housing Code a progressive ban schedule for energy-inefficient dwellings. Article L.173-1-1 of the CCH sets three successive deadlines for primary residences, determined by the DPE class (Diagnostic de Performance Énergétique — the French Energy Performance Certificate) of the dwelling under the 3CL-DPE 2021 methodology (decree of 31 March 2021).
| Date | Banned class | Legal basis |
|---|---|---|
| 1 January 2025 | G (consumption > 420 kWh/m²/yr primary energy) | CCH art. L.173-1-1 |
| 1 January 2028 | F (consumption 330 to 420 kWh/m²/yr) | CCH art. L.173-1-1 |
| 1 January 2034 | E (consumption 250 to 330 kWh/m²/yr) | CCH art. L.173-1-1 |
⚠️ "Relance logement" housing bill — not yet voted: announced on 23 April 2026 and presented to the Council of Ministers on 24 June 2026, with a vote hoped for before the end of 2026, this bill would create a derogation allowing an F- or G-rated dwelling to be let again under a renovation commitment (3 years for a detached house, 5 years in a condominium), evidenced by a works contract signed with a contractor. It would not be a postponement: the schedule of article L.173-1-1 of the CCH would remain unchanged (G banned since 1 January 2025, F on 1 January 2028, E on 1 January 2034), for a stated government target of 650,000 to 700,000 dwellings kept on or brought back to the market. Entry into force would depend on implementing decrees — the content of the works contract is expressly referred to them — and nothing is specified at this stage for leases already in force. Until the text is voted, a property dealer should keep costing operations on the schedule currently in force; the mechanism is analysed in detail in our analysis of the 2026 Relance logement housing bill.
Decree no. 2022-1143 of 24 August 2022 has also frozen rents on F and G dwellings: no rent indexation (IRL — Indice de Référence des Loyers), no upward revision at lease renewal as long as the class remains unchanged. Over five years of freeze with an average IRL of 3.5% per year, the cumulative loss represents around 18% of the expected indexed rent.
The regulatory energy audit (CCH article L.126-28-1) has been mandatory at sale since 1 April 2023 for F and G single-family houses or sole-ownership dwellings. It was extended to class E dwellings on 1 January 2025 and will be extended to class D on 1 January 2034. For a property dealer, this is the reference document for sizing the renovation bundle from the preliminary sale agreement onwards.
The reform of the primary-energy conversion coefficient for electricity (the 2.3 factor reduced to 1.9 in the 3CL-DPE 2021 methodology) which entered into force on 1 January 2026 has reclassified around 850,000 electrically heated dwellings out of the thermal sieve status, with no renovation work. This reform mechanically shifts the property-dealer opportunity towards the oil-heating segment, which remains F or G in nearly all configurations and still accounts for 2.8 million dwellings in mainland France.
On the tax side, the property dealer status falls under article 35 I 1° of the French General Tax Code (CGI): profits are taxed as industrial and commercial profits (BIC — Bénéfices Industriels et Commerciaux). The VAT-on-margin regime provided by articles 257 and 268 of the CGI applies to the resale of a property acquired without deduction rights and held for more than five years after delivery — this is the key to the model's profitability, provided the operation is not reclassified as new construction due to excessive structural works. To go deeper into the VAT and BIC tax framework of buy-renovate-sell operations, see our dedicated guide.
The winning triangle: purchase discount, controlled renovation cost, captured green value
The profitability of a property-dealer operation on the thermal-sieve segment rests on three correlated variables: the discount actually obtained at purchase, the renovation cost required to clear enough DPE classes, and the value added captured at resale — the "green value" as defined in the annual study by Notaires de France. Each variable is piloted independently, but they aggregate on net margin.
Why the 1948-1974 oil-heated house captures the maximum discount
The Notaires de France 2026 green value study on the discount applied to energy-inefficient homes (2024 transactions, published January 2026) puts the average discount of a G-rated property versus an equivalent D-rated property at 25% on houses and 12% on apartments. The gap is mechanical: a detached house does not benefit from party walls to dampen thermal losses, its DPE is more penalising at equal insulation, and the final buyer prices this differential into their offer. The property dealer therefore captures twice as much value at purchase on a house as on an apartment, and avoids the homeowners-association deadlocks on votes for external wall insulation (ITE) or replacement of collective boilers in apartment buildings.
The 1948-1974 period also concentrates a stock built rapidly with zero or minimal insulation standards, on generally sound concrete or breeze-block structures. According to statistics from the French National Renovation Observatory (ONRE), 25% of dwellings from this period are still heated with fuel oil — an energy source where replacement by an air-to-water heat pump yields a two-DPE-class gain in almost all configurations.
Profile of choice 2026: detached house of 60 to 100 m², built between 1948 and 1974, originally heated with fuel oil or electric resistive radiators, located in a B1 or B2 housing zone with discount (Le Mans, Clermont-Ferrand, Limoges, outskirts of Rennes or Grenoble), outside complex condominiums, outside flood zones, outside Architects of Historic Buildings (ABF) perimeters.
The cost-per-DPE-class ratio of the main renovation actions
Not all energy renovation actions yield the same return per euro invested. An ADEME study published in December 2024 (TREMI programme) reminds us that 75% of "single-action" renovations do not change the DPE class — the effective exit from thermal sieve status requires a bundle of at least three actions among six (wall insulation, roof insulation, floor insulation, joinery, ventilation, heating and domestic hot water).
| Renovation action | 2026 cost (100 m² house) | Typical DPE gain | € per class |
|---|---|---|---|
| Thermodynamic water heater (CET) | €2,000 to €4,000 | +1 class (DHW = 10 to 20% of consumption) | ~€2,500/class |
| Loft insulation | €2,000 to €5,000 | +1 class if initially uninsulated | ~€3,500/class |
| Pellet stove (main heating) | €3,000 to €8,000 | +1 class if replacing oil heating | ~€5,000/class |
| Air-to-water heat pump (replacing oil) | €10,000 to €18,000 | +1 to 2 classes | ~€7,000/class |
| Internal wall insulation (ITI) | €4,000 to €9,000 | +1 class | ~€6,500/class |
| External wall insulation (ITE) | €12,000 to €22,000 | +1 to 2 classes | ~€12,000/class |
| Double-glazed windows (12 units) | €6,000 to €15,000 | 0 class as a standalone action | bundle only |
| Double-flow ventilation (VMC) | €4,500 to €10,000 | ≈ 0.3 class as a standalone action | bundle only |
Three strategic bundles stand out to frame a property-dealer operation:
- Exit from G thermal sieve to E: thermodynamic water heater + loft insulation + air-to-water heat pump, for €14,000 to €27,000 on 100 m². Minimum target to allow re-letting from 1 January 2028.
- F to D jump: previous bundle + internal wall insulation on two gable walls + replacement of single-glazed windows, for €25,000 to €40,000. Standard resale target.
- High-performance E to C/B: full six-action bundle with external wall insulation and double-flow ventilation, for €40,000 to €70,000. Premium or tight-market target.
The 2026 subsidy matrix by legal status
Eligibility for energy renovation subsidies depends on the legal status of the project owner — not on the nature of the renovated property. On this point, property dealers and rental-purpose civil real estate companies (SCI bailleur) face structural exclusion that significantly reduces the volume of direct subsidies accessible.
| Status | MPR single-action | MPR full reno | CEE | Eco-PTZ loan | 5.5% VAT | Property income deficit |
|---|---|---|---|---|---|---|
| Individual landlord (own name) | Yes | Yes | Yes | Yes | Yes | Yes (doubled €21,400) |
| SCI under personal income tax (third-party rental) | No | No | Yes | Yes | Yes | Yes (pro rata) |
| SCI under corporate tax | No | No | Yes | No | Yes | No |
| Property dealer | No | No | Yes | No | Yes | No |
For a property dealer, two levers concentrate the bulk of mobilisable subsidies:
- Energy Saving Certificates (CEE — Certificats d'Économies d'Énergie) — "Boost heating" bonus on an air-to-water heat pump with seasonal energy efficiency ETAS ≥ 140%: €3,000 to €5,000 depending on the climate zone and heated surface. Delegation to an approved third party (Hellio, Effy, La Prime Énergie) must be signed before the works quote, otherwise the operation is ineligible.
- Reduced VAT at 5.5% (CGI article 278-0 bis A) on energy quality improvement works carried out in dwellings completed more than two years ago, by a company holding the RGE (Reconnu Garant de l'Environnement) label. On €60,000 of energy works, the saving reaches €8,700 compared with the standard 20% rate.
For an individual landlord, the doubled property income deficit at €21,400 per year on energy renovation works of F and G thermal sieves — extended by the 2026 Finance Act until 31 December 2027 — remains the dominant lever. It offsets directly against the household's overall income, provided that the dwelling moves from class E, F or G to class A, B, C or D within two years of the offset.
Case study: 100 m² G-rated house in Le Mans, resold as D
To measure the real profitability of a property-dealer operation on the thermal-sieve segment, let's examine a representative case. Le Mans in dynamic B2 zone (median DVF price for D-rated house: €220,000 at end-2024, source notaries of Sarthe), 100 m² house from the 1960s, oil heating, G rating, seller's energy audit available.
Operational scenario — Discounted purchase, F-to-D bundle, twelve-month resale
| Item | Detail | Amount |
|---|---|---|
| Market price for equivalent D-rated house | DVF reference for the area | €220,000 |
| Negotiated "G thermal sieve" discount | −25% house G vs D (Notaires 2025) | −€55,000 |
| Net purchase price for seller | — | €165,000 |
| Property dealer notary fees | ~2.5% (BIC regime, reduced duties) | €4,125 |
| F-to-D renovation bundle (heat pump + loft + ITI + windows) | Including 5.5% VAT, RGE companies | €50,000 |
| CEE Boost heating (air-to-water heat pump) | Third party signed before quote | −€4,500 |
| Standard CEE on loft + wall insulation | €15/m² × 240 m² of walls | −€3,600 |
| 5.5% VAT (vs 20%) on €50,000 of works | Pure saving | −€7,250 |
| Total subsidies captured | — | −€15,350 |
| Financing costs, insurance, taxes during holding (10 months) | — | €4,500 |
| Resale energy audit + new DPE | — | €1,200 |
| Total cost of revenue | — | €209,475 |
| Resale price (class D, Le Mans B2 market) | + captured green value | €245,000 |
| Gross margin | 17% of resale price | €35,525 |
BIC taxation of the gross margin under the real-profit regime (marginal income tax rate of 30% + 9.7% CSG-CRDS social charges on the BIC fraction, for an operator in their own name) brings the net margin to around €21,500, i.e. 9% of the resale price. For an operator using a corporate vehicle (property-dealer SARL or SAS under corporate tax), the pre-tax result would be similar with a tax rate of 15% up to €42,500 then 25% beyond, opening the way to a deferred tax burden through capitalised profits.
If you give up the VAT-on-margin regime by carrying out structural works that qualify as new construction (modification of the load-bearing structure, increase in surface area), the standard 20% VAT applies to the total resale price, which wipes out €49,000 of margin on the previous example. This is the first golden rule when arbitrating between heavy renovation and reconstruction.
The four mistakes that destroy net margin
Mistake no. 1 — Buying without a prior energy audit
The regulatory energy audit (CCH art. L.126-28-1) that the seller of a thermal sieve has been required to produce since 1 April 2023 contains the detail of recommended works and their indicative cost estimated by the certified auditor. Buying without reading it — or worse, without requesting it before making an offer — exposes you to a cost discovery that can multiply the renovation budget by 1.5 or 2 (asbestos presence, degraded structure, electrical network to be fully redone). On a 100 m² house, an unforeseen extra cost of €20,000 turns a 17% gross-margin operation into an 8% one — the entire net margin disappears.
Mistake no. 2 — Ignoring the legal status before launching works
If you operate as a property dealer (BIC) or through a corporate-tax SCI, you are structurally excluded from MaPrimeRénov' — neither the single-action route nor the supported full-renovation route is open to you (anah.fr/proprietaires-bailleurs, 2026 conditions, detailed in our guide to the new MaPrimeRénov' 2026 rules and grant schedules). You remain eligible for CEE and 5.5% VAT, but on €60,000 of works, the subsidy gap between an individual landlord and a property dealer reaches €15,000 to €25,000. This gap must be factored into the discount negotiated at purchase — otherwise, it's the buyer who pays for the structuring mistake.
Mistake no. 3 — Underestimating VAT-on-margin requalification
The VAT-on-margin regime provided by article 268 of the CGI assumes that the resold property remains legally the same as the one acquired — same building, same configuration, same purpose. If your works modify the load-bearing structure, create a floor, split a dwelling into two or change the use (for example commercial to residential), the tax authority may requalify the operation as new construction and apply 20% VAT to the total resale price. On the Le Mans example, that represents €49,000 of additional VAT — i.e. 1.4 times the initially planned gross margin. Validation by a tax lawyer before launching structural works costs €1,500 to €3,000, and this is a priority safety expense.
Mistake no. 4 — Missing the 2028 time window
On 1 January 2028, F-rated dwellings can no longer be let as primary residences — a 2028 rental shock whose scale varies sharply from one French city to another. If you buy an F in 2026 and the works slip, delivery of the renovated property as E or D must be effective before that date — otherwise, the buyer (individual landlord or another property dealer) will apply an additional discount to compensate for the risk of losing rental use. The purchase-renovation-resale cycle of an average operation is twelve to eighteen months; beyond 1 January 2027, the room for manoeuvre shrinks sharply. Beyond 30 June 2027, you become a forced seller.
⚠️ Warning: The 2026 — first-half 2028 window is the most favourable of the cycle, but it is closing mechanically. From the second half of 2028 onwards, the supply of renovated properties will mass-market and the green-value premium at resale will dilute. Operations launched after mid-2027 must be costed with an increased safety margin.
Run your property-dealer operation before buying
Mon Simulateur Immobilier property dealer buy-renovate-resell simulator
Estimate your gross margin and your net margin after BIC or corporate tax on a thermal-sieve renovation operation: discounted purchase price, renovation cost by line item, captured subsidies (CEE and 5.5% VAT), VAT-on-margin treatment at resale, taxation by legal status. The simulator integrates the 2025 regional discounts from the annual Notaires de France study and the current-year CEE schedules.
To go further: calculator for 2026 subsidies — MaPrimeRénov', CEE and eco-PTZ loan and DPE audit tool before purchase.
Ongoing development (June 2026): the "Relance logement" housing bill presented on 23 April 2026 (Council of Ministers meeting of 24 June 2026) would widen the rental-investment tax scheme: extension to older detached houses, works threshold lowered from 30% to 20% of the acquisition price, and the post-works class A/B requirement replaced by a two-letter DPE gain. The text has not been voted — factor it into your regulatory watch, not into a business plan.
Conclusion
The 2026 DPE renovation strategy for property dealers and investors comes down to four decisions framed from the preliminary sale agreement: choose the right property profile (1948-1974 detached house with oil heating in a discounted B2 zone), build the renovation bundle at the best cost-per-class ratio (thermodynamic water heater + loft + heat pump as minimum target), mobilise the subsidies actually accessible to your legal status (CEE and 5.5% VAT for a property dealer, plus the doubled €21,400 property income deficit for an individual landlord), and secure the VAT-on-margin treatment at resale by avoiding any requalification as new construction.
On the flagship 1948-1974 oil-heated house profile in Le Mans, the costed operation yields 17% gross margin in twelve to eighteen months. This margin only holds within the 2026 — first-half 2028 window: beyond that, the regulatory pressure of the F ban on 1 January 2028 thins the supply, but it also mass-markets renovated supply that dilutes the green-value premium. Before positioning an offer, the Mon Simulateur Immobilier post-renovation DPE class simulator lets you estimate the expected new class based on the chosen renovation bundle, then frame the gross and net margin on your specific case.
