Minimum Bedroom Sizes in France: What the Law Actually Says (And What It Means for Ski-Property Buyers)

Every buyer looking at a French ski property sooner or later runs into the same quiet question: what counts as a bedroom? It matters more than you’d think. A listing advertising a ‘three-bed apartment’ may include a cabine — a windowless bunk alcove — that the French legal system does not recognise as a bedroom at all. For mortgage purposes, for VAT reclaim, for DPE energy ratings, for rental licences and for resale value, the difference between a classified bedroom and an officially-unrecognised sleeping space can be tens of thousands of euros.

This guide walks through the two rulebooks that govern the answer. The first is Decree No. 2002-120 of 30 January 2002, which sets the legal definition of a decent home (logement décent) for long-term rental. The second is the Loi Carrez of 1996, which governs how surface area is measured for co-ownership sales disclosures. Neither is perfectly aligned with the other, and neither is the same as the marketing copy on a property portal — which is exactly why buyers get tripped up.

We’ll cover the minimum floor area (9 m²), the minimum ceiling height (2.20 m), the minimum cubic volume (20 m³), the window and natural-light rules, how mezzanines are treated, how cabine spaces are handled, what happens when a bedroom doesn’t qualify, and — most importantly — how all of this interacts with the practical decisions ski-property buyers face when comparing apartments in Morzine, Courchevel or Val d’Isère. The goal is to give you the tool to read a listing and know, before you even contact the agent, what you’re actually being offered.

Decree No. 2002-120 of 30 January 2002 was introduced to end the rental of substandard housing in France. It establishes the conditions a dwelling must satisfy to qualify as logement décent — ‘decent housing’ — and is the foundational text for long-term rental regulation. The key measurement for bedrooms is buried in Article 4: the main room (pièce principale) must have either a minimum surface area of 9 m² with a ceiling height of at least 2.20 m, or alternatively a minimum habitable volume of 20 m³. Either threshold is sufficient; the decree allows the landlord to meet one or the other.

Critical detail: the 9 m² / 2.20 m / 20 m³ rule applies to the pièce principale, which is the main living room of the dwelling, not to individual bedrooms. This is frequently misread. In a studio apartment the ‘main room’ and the ‘bedroom’ are the same thing, so the rule effectively sets a 9 m² minimum for studios. In a multi-room apartment it is only the largest living room that must strictly satisfy the rule. Bedrooms in separate rooms are governed more loosely — they must meet the more general habitability standards around ventilation, natural light and safety, but the 9 m² floor is not a hard legal threshold for each individual sleeping room.

In practice, however, market convention and the professional bodies (notably the FNAIM and the ANIL tenant-rights organisation) treat 9 m² as the de-facto minimum for any room marketed as a bedroom in the long-term rental market. Anything smaller is likely to be re-categorised as an alcôve, coin nuit or cabine rather than an official chambre, which affects how it appears on the lease, the Carrez surface disclosure and the DPE. Buyers relying on listings should always check the Carrez report attached to the sales dossier — it is the single most reliable document on what each room actually measures.

The Loi Carrez of 1996 (Law 96-1107) is the law that governs how property size is officially disclosed in French co-ownership (copropriété) sales. It does not set minimum sizes — it sets measurement rules. The Carrez surface is the interior floor area of every private part of the property, excluding walls, partitions, stairwells, openings (doors and windows), shafts and any space with a ceiling height below 1.80 m. Note that this 1.80 m threshold is for Carrez measurement only; it is lower than the 2.20 m habitability threshold from Decree 2002-120.

The practical consequence of the two thresholds is important. A mezzanine with a 1.90 m ceiling counts towards the Carrez square metres (because it’s above 1.80 m), but it does not satisfy the ‘decent room’ test for long-term rental (because it’s below 2.20 m). So an apartment can legitimately advertise 65 m² Carrez while only 55 m² of that area qualifies as proper habitable space. Buyers should always ask to see both figures, because the gap is where the disputes happen.

A Carrez measurement error of more than 5% below the disclosed figure gives the buyer a legal right to a proportional price reduction after completion. This is one of the strongest consumer protections in French property law and is specifically designed to prevent the kind of optimistic rounding that happens in British floor-area disclosures. For buyers of ski apartments, this matters: always verify the Carrez figure in the sales dossier and ensure the surveyor (géomètre-expert) certification is current.

The cabine — sometimes called a cabine enfants or chambre cabine — is a peculiarly Alpine feature. It’s a small sleeping alcove, typically with bunk beds, often windowless, tucked off the hallway or corridor of a ski apartment. Developers love them because they allow a studio or one-bed to sleep four or five people, maximising rental revenue per m². Buyers need to understand exactly what they’re getting.

A cabine is not legally a bedroom under French law. It almost always fails the natural-light requirement, usually the 9 m² floor test, and sometimes the 2.20 m ceiling rule. Listings that describe an apartment as ‘two-bed + cabine’ or ‘sleeps 6’ are using the cabine as a marketing device, not a legal classification. The room does not appear as a chambre on the Carrez report, and it does not add to the apartment’s habitable count for DPE purposes. For rental listings on Airbnb, Booking.com and managed-lettings platforms the cabine counts as extra beds, but it does not upgrade the apartment’s official room count.

This matters for resale value. A ‘2-bed + cabine’ apartment priced in the market as a three-bed will underperform against buyers and agents who understand the distinction. Our general advice to buyers: treat cabines as a bonus bed for rental purposes but never as a reason to pay three-bed prices for a two-bed property. If you’re building the rental maths, the cabine increases the per-week revenue because it increases the sleeping capacity — that’s real. But it doesn’t increase the underlying asset value, and on resale you’ll be selling as a two-bed.

French habitability law requires that every pièce principale has natural light and direct ventilation. This is the rule that disqualifies most cabines and windowless alcoves. The standard interpretation, drawn from the 1969 building regulation and the more recent 2002 decree, is that a main room must have a window of at least 1/8 of the floor area opening onto the exterior. A 9 m² bedroom therefore needs at least 1.125 m² of window. Velux roof windows count, provided they open and provide both light and ventilation.

There is a specific carve-out for low-use spaces: corridors, bathrooms, WCs, kitchenettes integrated into a living room and certain utility spaces can legally be windowless, provided mechanical ventilation (VMC) is installed and meets current standards. A ‘blind’ kitchen in a modern ski apartment is legal if it has extraction; a blind bedroom is not. This rule is one of the primary reasons that older top-floor conversions in central village properties can fail the habitability test and end up classified as combles (attics) rather than habitable space.

For buyers of older resale properties, always check the DPE (energy performance certificate) and the habitability surface disclosure. These documents reveal whether the official floor area excludes rooms that have been physically built but don’t legally qualify as habitable. The discrepancy between marketed surface and legal habitable surface is the single biggest source of post-completion disputes in the Alpine resale market.

Mezzanines are extremely common in Alpine chalets and duplex apartments, and they sit in a legal grey zone that catches out many buyers. The two thresholds you need to remember are 1.80 m and 2.20 m. Below 1.80 m, the space is excluded from Carrez altogether — it doesn’t count towards the saleable surface. Between 1.80 m and 2.20 m, the space counts towards Carrez but does not qualify as a habitable room under Decree 2002-120. Above 2.20 m, the space counts both for Carrez and for habitability.

A classic trap is the chalet mezzanine that’s advertised as a bedroom but has a sloping ceiling. If the central ridge is 2.50 m but the eaves are 1.60 m, the ‘useful’ floor area is only the portion above 2.20 m — often less than half the visible footprint. Buyers should insist on floor-by-floor measurements in the Carrez report and ask how much of the mezzanine space is legally habitable versus merely Carrez-countable. A competent French agent or surveyor will provide this breakdown on request.

For converted attics in old Savoyard buildings, the situation is more complex still. A full attic conversion requires a planning declaration (déclaration préalable or building permit, depending on the scale), structural reinforcement to meet load requirements, proper ventilation and — critically — a habitability survey to confirm the converted space meets the 2.20 m rule. Unauthorised attic conversions are common in older chalets and can create serious problems at resale, particularly when the banks performing the mortgage valuation spot the discrepancy between the declared and actual habitable surface.

For short-term furnished rentals — the bread-and-butter of ski-property investment — the interaction between Decree 2002-120 and the rental regulatory framework is slightly different from long-term lets. Short-term rental regulation is governed by the meublé de tourisme classification system (the official tourist-rental star rating) and by local mairie declaration rules. The Meublé de Tourisme Arrêté of 2 August 2010 sets out the classification criteria, which include minimum surface per bed, heating, ventilation, kitchen equipment and safety standards.

Under the meublé classification, bedroom minimums are defined by occupancy: a single bedroom must be at least 7 m² for one person or 9 m² for two people, with higher minimums for three or more occupants. These thresholds are slightly lower than the Decree 2002-120 ‘decent housing’ rule for long-term lets, reflecting the shorter duration of short-term stays. For the 2025 rating update, the minimums were left unchanged, though other quality standards (energy performance, digital services, accessibility) have been tightened.

The practical implication for investors is that a property might qualify for meublé de tourisme classification and commercial short-term rental even if it wouldn’t qualify as a long-term rental under the 2002 decree. This matters because the managed-rental VAT reclaim schemes for new-build ski apartments rely on the property being used as a classified meublé de tourisme — so the tighter long-term rules often don’t apply. The new-build ski apartments we sell are almost all explicitly designed to meet the classification thresholds from day one, which is one of the real advantages of VEFA over older resale stock.

For any serious buyer, the diligence checklist is short and specific. First, ask for the Carrez certificate in the sales dossier and compare it to the advertised figure. If there’s a gap, the Carrez number wins. Second, ask whether any of the bedrooms are cabines or coin nuit rather than formally classified chambres — this is a legal distinction, not a polite euphemism. Third, request the DPE and check the habitable surface recorded there against the Carrez figure. Fourth, for older resale properties, ask when the last habitability audit was conducted and by whom.

If the property is a new-build VEFA purchase, these checks are less critical because the developer is legally required to deliver to the declared specifications under the VEFA contract, and any shortfall triggers a price adjustment and completion delay. For resale, however, you are buying what you see — and what you see may not match the listing. Our buying process guide walks through each checkpoint in the French purchase timeline, and our team helps British clients verify Carrez and DPE disclosures at every stage.

A final note on value. Tight legal definitions of what counts as a bedroom are not bureaucratic pedantry — they are consumer protection. When you buy a French property you are buying it with legally-protected floor area disclosures that do not exist in the UK market in the same form. Use those disclosures. A well-read Carrez report will tell you more about an apartment than an hour walking through it. And for British buyers used to the sometimes loose UK marketing conventions, the French discipline is something to embrace rather than work around.