Three rule changes decide most buying and selling decisions in the Riviera hinterland right now: the new way the DPE energy rating is calculated from 1 January 2026, the ban on renting out the worst-rated homes, and the choice the Alpes-Maritimes department made to keep its notaire transfer tax lower than most of France. Here is our honest read. The 2026 DPE recalculation lowers the conversion factor used for electricity from 2.3 to 1.9, which should pull roughly 850,000 all-electric homes across France out of the F and G bands without anyone touching a wall. The rental ban already bites: a home rated G cannot be let on a new lease since 1 January 2025, F follows in 2028 and E in 2034. And the department of the Alpes-Maritimes declined the option to raise its share of the transfer tax to 5 percent, so buying an older property here stays slightly cheaper than in the many departments that took the increase. If you are buying a villa in Valbonne, Mougins or Grasse, or selling one you have held for years, these three threads run through every figure on the table.

The rest of this guide walks through each change, what it costs in real euros, and the practical checks we run before we let a client sign anything.

The DPE and the 2026 recalculation

The DPE, the diagnostic de performance energetique, is the letter grade from A to G that every French home carries when it is sold or let. It rates energy use and carbon output, and since 2021 it is binding rather than advisory, which means it now drives whether a property can legally go on the rental market at all. A buyer reads it the way an investor reads a credit score.

From 1 January 2026 the method behind that letter changed. The coefficient that converts electricity into primary energy dropped from 2.3 to 1.9. In plain terms, the old formula treated French electricity as far dirtier than it is, which punished all-electric villas and homes running on heat pumps. The government corrected that. The estimate from the economy ministry is that around 850,000 homes nationally move up at least one band, and a meaningful share of those leave the F and G bands entirely. The reform cannot push any home down a grade, so no owner loses ground from the change itself.

For the hinterland this matters more than the national average suggests. A large number of villas built in Valbonne, Opio and Le Rouret from the 1970s through the 1990s run on electric heating and electric hot water. Some of those properties were sitting at F on the old method and will read E on the new one. That single letter can be the difference between a home you can rent and a home you cannot, and it changes the renovation maths a seller faces before listing. We tell clients to ask for a fresh DPE dated 2026 rather than relying on a certificate issued in 2024 or early 2025, because the same house can carry a different grade depending only on when the survey was run.

Two more details matter for older stock. A DPE issued under the current rules stays valid for ten years, but one run on the early version of the post-2021 method may have a shorter remaining life, so check the expiry before you rely on it. And the way very small homes are scored was already corrected in July 2024, which lifted many studios and one-bed apartments under 40 square metres by a class. That correction matters less in the hinterland, where houses dominate, but it shows up in Grasse old town and in the apartment pockets of Mougins and Biot, where the smaller units sit.

The rental ban on poorly rated homes

A home rated G has been off limits for new rentals since 1 January 2025. That is the rule that catches most owners by surprise. It comes from the Loi Climat et Resilience of August 2021, and it works on a calendar that tightens every few years. The French call the worst homes passoires thermiques, energy sieves, and the law is written to push them off the rental market or into renovation.

The calendar is simple to memorise. The most extreme G homes were blocked first in January 2023. All G homes followed on 1 January 2025. Class F is blocked from 1 January 2028, and class E from 1 January 2034. The class thresholds are fixed in energy use: F runs from 331 to 420 kWh per square metre per year, and G is anything above 421. The ban applies to new leases, to renewals, and to tacit renewals, so an existing tenant does not get evicted, but the owner cannot sign a fresh lease on a banned property.

There is a second, quieter rule that has been live since August 2022. Rents on F and G homes are frozen, which means a landlord cannot raise the rent on an energy sieve even where the lease would normally allow an index adjustment. Read the two rules together and the message to owners of older electric villas is direct. Either bring the home up the scale, or accept that its value as a rental is capped and falling.

Enforcement runs through the tenant rather than a roving inspector. A renter in a non-compliant home can ask the court to order the works or cut the rent, which is a real risk for any owner who tries to let a banned property quietly. Holiday lets sit in a separate regime that varies by commune, and several Riviera towns have tightened short-term rental rules of their own, so a buyer planning seasonal income should check the local position in the mairie before counting on it. For a standard long lease, though, the DPE rule is national and it is not negotiable.

The energy audit you now need to sell

If you sell a single-owner house rated E, F or G, you must commission an audit energetique on top of the standard DPE. This is separate from the rental rules and it applies to the sale itself. The obligation rolled out by class: F and G houses since 1 April 2023, and class E houses since 1 January 2025. Class D joins in 2034. It applies to monopropriete, meaning a standalone house or a building owned by one person, rather than an apartment inside a co-owned block.

The audit is not a formality. It is a full survey that sets out the home's current performance and then lays out at least two renovation routes, each designed to lift the property by a minimum of two classes. The buyer receives it before signing and uses it to price the work. Budget roughly 700 to 1,500 euros for a house, and note the document stays valid for five years. We see sellers treat it as an annoyance and buyers treat it as a negotiating file, which tells you who reads it more carefully.

Our practical advice to sellers is to order the audit early, before the photographs go up, not after an offer lands. A buyer who opens the audit at the eleventh hour and finds 120,000 euros of recommended work will reopen the price. A seller who already holds the audit, has priced it into the asking figure, and can show one clean renovation path keeps control of the conversation.

Notaire fees and the Alpes-Maritimes decision

The Alpes-Maritimes held its transfer tax at the lower rate, which makes buying an older home here a little cheaper than in most of France. The 2025 finance law let departments lift their share of the droits de mutation, the DMTO, from 4.5 to 5 percent for purchases signed between 1 April 2025 and 31 March 2028. Around three departments in four took the increase. The Alpes-Maritimes council declined, judging that a higher entry cost would hurt an already stretched local market. The department keeps its share at 4.5 percent, which leaves the total transfer duty near 5.81 percent on an existing property.

What people loosely call frais de notaire is mostly this tax, not the notaire's own fee. On an older home in the 06 the all-in cost typically lands around 7 to 8 percent of the price, with the DMTO the largest slice, the notaire's regulated emoluments a smaller one, and assorted disbursements on top. New-build purchases sit far lower, nearer 2 to 3 percent, because they fall under a different duty regime.

The saving from the department's decision is real but modest. On a 1,000,000 euro villa, the half-point the Alpes-Maritimes chose not to add is worth about 5,000 euros against a buyer in a department that raised the rate. It will not change whether you can afford a house. It is, though, one more reason the 06 keeps drawing buyers who compare it against the Var or the Bouches-du-Rhone next door.

Capital gains and what sellers actually owe

If the property you sell is your main home, the gain is exempt from French capital gains tax, full stop. That covers most resident families moving between hinterland villages, and it is the cleanest position a seller can hold. The tax bites on second homes and investment property, and a large share of hinterland sales fall into that bracket because so many owners here are international buyers with a primary home elsewhere.

On a second home the gain is taxed at 19 percent income tax plus 17.2 percent social levies, so 36.2 percent before relief. The relief is what changes the picture over time. The taxable gain tapers with how long you have held the property, with full exemption from income tax after 22 years and from social levies after 30 years. A villa bought in the early 2000s and sold now may carry a far smaller bill than the headline rate suggests, while a home bought five years ago and flipped pays close to the full amount.

Non-resident sellers face the same framework with a few extra steps, including in some cases a fiscal representative for higher-value sales. The rules here are stable and long-standing, which is why we list them alongside the newer energy changes rather than as breaking news. The practical point for 2026 is that a seller weighing whether to renovate before listing should run the capital gains maths and the renovation maths together, since spending on works can raise both the sale price and, through documented improvement costs, the deductible base against the gain.

Prices and what the rules mean town by town

Here is where the eight communes sit on price in mid-2026, and how the energy rules land differently in each. The figures below are indicative average house prices per square metre, drawn from MeilleursAgents, efficity and SeLoger between January and June 2026. Treat them as a guide, because the spread within a single commune is wide and the right number for a specific villa depends on its sector, plot and condition.

Commune	Indicative house price per m2 (mid-2026)	Where the energy rules bite hardest
Grasse	around 3,450 EUR	Old-town stone apartments, hard to insulate, many at E or F
Le Rouret	around 5,500 EUR	1980s electric villas now reassessed under the 2026 method
Roquefort-les-Pins	around 5,720 EUR	Large detached homes with high heating loads
Biot	around 5,850 EUR	Village houses with thick walls but dated systems
Valbonne	around 6,010 EUR	Electric villas near Sophia that the recalculation often helps
Chateauneuf-de-Grasse	around 6,290 EUR	Hillside houses where the audit drives the negotiation
Mougins	around 6,630 EUR	Golf-sector villas where buyers price renovation in fully
Opio	around 6,750 EUR	Rural plots, older mas properties, mixed ratings

Grasse is the value entry, and it is also where the rental ban hits hardest, because the old town is full of stone apartments that grade E or worse and resist cheap insulation. Valbonne and the villa sectors around Sophia Antipolis are where the 2026 recalculation does the most good, since so much of that stock is electric. Opio and Roquefort-les-Pins, with their larger detached houses and bigger heating loads, are where we most often see an audit reshape an offer. The pattern holds across the area: the cheaper the entry price, the more likely the energy file is the reason.

Buying an older villa: the checks we run

Before a client commits to an older hinterland villa, we work through a short list that the 2026 rules have made non-negotiable. First, read the DPE date. A certificate run before January 2026 may understate an all-electric home, so we ask for a fresh one or factor the likely uplift into the offer. Second, if the home grades E, F or G, demand the audit energetique and read both renovation scenarios, because they tell you the real cost of getting the property to a rentable and future-proof standard.

Third, separate the rental question from the living question. If you intend to live in the house, a poor DPE is a price lever and a comfort issue, not a legal block. If you intend to let it, a G rating means you cannot sign a new lease today and an F rating means the clock runs out in 2028. Fourth, confirm the transfer cost with the notaire in writing, since the Alpes-Maritimes rate of 4.5 percent on the departmental share holds for now but the national framework runs only to March 2028.

Fifth, look at the heating system itself rather than the letter alone. A villa that already runs a recent heat pump will read better under the 2026 method and cost less to bring into line than one on old electric convectors or an ageing oil boiler. The system is the single biggest swing factor in both the grade and the renovation bill.

Sixth, line the energy file up against the rest of the dossier de diagnostic technique that any French sale must carry. Asbestos, lead, termites, the electrical and gas check, and the risk and pollution statement all sit in the same pack, and an older hinterland villa often flags two or three of them. None of these block a sale the way a G rating blocks a lease, but a buyer who reads the full pack prices the house honestly. We would rather a client see every diagnostic before the offer than meet a termite report after the compromis is signed.

Selling an F or G home without losing the room

The honest position for a seller of an F or G home is that the market knows the rules as well as you do, so the worst move is to pretend the energy file does not exist. Buyers in 2026 walk in already pricing renovation. What you can control is whether they price it against your number or their own worst-case guess.

We push three steps. Commission the audit before listing and read it yourself, so you can speak to the cost with authority rather than flinch when it comes up. Get one or two firm quotes for the cheaper of the audit's two renovation routes, because a buyer trusts a builder's figure far more than a vague estimate. And decide your strategy on purpose: either complete the key works and relist at the higher grade, or price the property as a renovation case and let the buyer take the project. Both can work. Drifting between them does not.

One more point that the 2026 recalculation creates. If your villa is all-electric and your existing certificate predates the new method, a fresh DPE may move you from F to E on paper alone. That can lift you out of the 2028 rental ban and change the buyer pool overnight. Spending a few hundred euros on a current diagnostic before you set the price is, in our view, the highest-return decision a seller of an electric home can make this year.

Renovation aid and how owners pay for the work

Most owners fund energy work through a mix of national grants and a zero-rate loan rather than cash alone. The two routes worth knowing are MaPrimeRenov, the state grant scheme for renovation, and the eco-pret a taux zero, an interest-free loan for energy work. Both have moved repeatedly in recent years, with eligibility and ceilings adjusted almost annually, so we will not quote a figure here that may be stale by the time you read it. Check the current terms on the official service-public and Anah pages before you budget.

What we will say is structural. The grants reward deep renovations that lift a home by several classes far more than they reward one-off fixes, which fits the audit energetique logic of a two-class minimum jump. International buyers should also note that eligibility often depends on the home being a primary residence and on income conditions, so a second-home owner may qualify for less than a resident family. That changes the renovation maths and, by extension, what a property is worth to different buyers.

Our plain advice is to treat any grant as a bonus, not the basis of the plan. Price the works on the assumption you fund them yourself, confirm what aid you actually qualify for, and treat anything granted as upside. Hinterland renovation costs are high enough that a buyer who counts on grants that never arrive ends up over-committed.

Our honest read

Put the three changes side by side and the direction is clear. The state wants older homes renovated or repriced, and it is using the DPE as the lever to make that happen. The 2026 recalculation softens the blow for the many electric villas in this part of the Alpes-Maritimes, the rental ban keeps tightening on everyone else, and the audit obligation has turned the energy file into the central document in any sale of an older house. The department's choice to hold transfer fees low is a quiet sweetener that keeps the 06 competitive against its neighbours.

For buyers, the takeaway is that the energy file is now where the value sits or leaks. A villa with a recent heat pump and a clean 2026 DPE deserves its premium. A cheaper home with a G rating and an audit full of work is only a bargain if you have read the numbers and want the project. For sellers, the message is to get ahead of the paperwork rather than be cornered by it. Order the diagnostics early, especially if your home is electric, and let the documents work for you instead of against you.

If you want our view on a specific property against these rules, send us the address and the DPE and we will give you a straight read before you go further.

Frequently Asked Questions

No. Since 1 January 2025 a home rated G cannot be put on a new lease anywhere in France, including the Alpes-Maritimes. The ban covers new leases, renewals and tacit renewals. An existing tenant can stay, but you cannot sign a fresh tenant into a G-rated property. Class F is blocked from 2028 and class E from 2034.

The coefficient that converts electricity into primary energy fell from 2.3 to 1.9. This makes the rating fairer for all-electric homes and heat pumps, which the old method penalised. The economy ministry estimates around 850,000 homes nationally gain at least one class, and many leave the F and G bands. No home can be downgraded by the change.

Yes, if it is a single-owner house rated E, F or G. The audit energetique is required on top of the DPE for the sale of a monopropriete house: F and G since 1 April 2023, and E since 1 January 2025. It costs roughly 700 to 1,500 euros for a house, stays valid five years, and sets out at least two renovation routes that each lift the home by a minimum of two classes.

Slightly. The Alpes-Maritimes council declined the 2025 option to raise its share of the transfer tax from 4.5 to 5 percent, while around three departments in four took the increase. The 06 keeps total transfer duty near 5.81 percent on an existing home. On a 1,000,000 euro villa that decision saves a buyer roughly 5,000 euros against a department that raised the rate.

There is no fixed discount, because it depends on the work the audit recommends. In practice buyers price the cheaper of the audit's two renovation routes and deduct it, plus a margin for disruption. For an older hinterland villa that can mean tens of thousands of euros. A seller who orders the audit early, holds a firm builder quote and prices accordingly keeps far more control than one caught out late.

Grasse old town feels the rental ban hardest, since it holds many stone apartments rated E or worse that resist cheap insulation. Valbonne and the Sophia Antipolis villa sectors benefit most from the 2026 recalculation, because so much of that stock is all-electric. Opio and Roquefort-les-Pins, with larger detached homes and higher heating loads, are where an audit most often reshapes an offer.

Usually yes. If your certificate predates January 2026 and your villa runs on electric heating or a heat pump, a fresh DPE under the new method may lift it a class, sometimes from F to E. That can move the home out of the 2028 rental ban and widen the buyer pool. A current diagnostic costs a few hundred euros and is, for an electric home, one of the highest-return steps a seller can take this year.