Floor space beneath a ceiling lower than 1.80 metres does not count towards a French apartment’s Carrez area. The French notarial property portal’s measurement definitions make that clear. In an Alpine apartment with a sloping roof, this can explain why the floor feels generous while the legal figure looks decidedly lean.
For a second-home buyer abroad, the difficult part is often getting everyone to discuss the same measurement. An advertisement, an old plan and a sale document may each contain a plausible number. The sofa still fits. The photographs still look inviting. Yet a price comparison built on incompatible areas can send your shortlist in the wrong direction.
The sensible response is to reconcile the documents before agreeing what the property is worth to you. This is a practical buying check, based on official and notarial guidance consulted on 18 October 2026, rather than a market-price survey. No resort average can resolve an unexplained difference inside one apartment.
Start with the label beside the number
Ask the selling agent to identify exactly what the advertised area represents. Is it superficie privative loi Carrez, surface habitable, or a floor-area figure described as surface au sol? Request the document behind it. A reply saying “approximately” may be perfectly reasonable for an initial description, but it is not the measurement evidence you need for a purchase decision.
These terms serve different purposes. The notarial definitions distinguish Carrez private area from habitable area; the two are related without being interchangeable. Resist translating every French surface label into the same English phrase. Keep the original wording in your comparison sheet, followed by a short explanation you understand.
Build that sheet around three separate entries: the documented apartment area, any additional low-height floor space, and external or ancillary spaces. Record the document date and who supplied it. This is a suggested working method, not an official form. It prevents a balcony from wandering into the denominator of a calculation because somebody copied a marketing headline.
For remote buyers, asking for the original PDF is particularly helpful. Cropped screenshots can remove the qualification printed below a figure. Keep all pages, including diagrams and notes, and have unfamiliar wording explained before treating it as an exact description of what you are buying.
Follow the roofline, then the paperwork
Carrez measurement concerns enclosed, covered private floor area, with deductions including walls, partitions and staircases. The height exclusion is especially relevant beneath the eaves. A low strip can be useful for drawers or luggage while contributing nothing to that legal area. Useful space and counted space answer different questions.
On a viewing, look at where you can stand, move around a bed and open storage. Ask for photographs taken from normal standing height. An ultra-wide lens can make a shallow room look surprisingly athletic. A short video walking from the doorway to the window is often a better practical aid than another polished still.
Consider a fictional apartment described as 60 m² at floor level but documented as 48 m² Carrez. The additional floor space has not vanished. It may sit beneath sloping ceilings or involve other exclusions that require explanation. Do not assume that this particular difference is legitimate simply because the building has a pitched roof; ask the measurer to reconcile it.
Also compare the present layout with the report. If partitions have moved, the apartment you visit may no longer match the configuration that was measured. A sketch with handwritten amendments is useful context, but it should prompt a question about whether an updated professional measurement is needed.
A balcony is valuable without becoming a bedroom
A sunny balcony, a secure garage and a dry cellar can materially improve ownership. They still deserve their own descriptions. Do not merge their square metres into the apartment’s Carrez figure, or decide they have no value merely because they sit outside it. The task is to understand the package.
Ask which spaces belong to the sale, how they are identified in the title documents and whether any advertised amenity is a right of use rather than a separately owned lot. The cellar door you are shown should correspond to the cellar described in the paperwork. The same goes for parking. A convenient space in a photograph is not evidence of ownership.
Service Public’s guidance on selling a co-owned property lists both the private-area information and the co-ownership documents supplied in the sale process. Use that documentary framework to ask your notaire how the apartment and its annexes fit together. Physical access alone does not settle the legal description.
For a ski home, make a separate practical note about storage: whether skis fit, whether the route is manageable in boots, and where wet equipment will dry. Those observations help you choose between properties. They do not require you to invent an adjusted legal area or a universal financial value for a ski locker.
Check the denominator before comparing the price
Here is deliberately fictional arithmetic, not a valuation or an Alpine market quotation. Suppose the apartment above has an asking price of €480,000. Divide by its 60 m² floor-level description and the result is €8,000 per square metre. Divide by its 48 m² Carrez area and it becomes €10,000 per square metre. The asking price has not changed; only the denominator has.
That difference does not prove the apartment is expensive. It proves that comparisons need consistent inputs. A spreadsheet can produce a beautifully precise answer to a badly framed question. If the next property uses Carrez area while the first uses total floor space, ranking them by the resulting ratios is unreliable.
Keep asking prices distinct from completed sale prices, and record when each quotation was checked. Where parking or another annex is included in the total price, say so. Avoid subtracting an invented garage value to manufacture a supposedly cleaner apartment price. A transparent imperfect comparison is more useful than a tidy unsupported one.
Then bring the decision back to use. Could the smaller measured apartment accommodate your household more comfortably? Does the larger one sacrifice circulation to corners where nobody can stand? Area is a valuable control on your thinking, but it cannot make the entire buying decision. View, condition, location and the building’s running costs still need their own assessment.
Resolve a discrepancy while you can still choose
Send the agent and your notaire a concise written question identifying each conflicting figure and its source. Attach the full documents. Ask which measurement will appear in the sale paperwork, whether the existing report reflects the current layout, and whether an independent professional should remeasure. You want a traceable explanation rather than several reassuring phone calls.
Give the discrepancy proportionate attention. A tiny rounding difference is different from a substantial unexplained shortfall or a room absent from the report. Do not turn every decimal into a dispute. Equally, do not dismiss a material discrepancy because travel has been booked or the seller hopes to sign quickly.
Tournaire Notaires’ Carrez guidance explains that an actual area more than 5% below the area stated in the deed can support a proportional price-reduction action, with a one-year deadline from the authentic deed. That is a legal remedy with conditions and a strict timetable, not an automatic discount or permission to market inaccurate measurements.
If a shortfall emerges after completion, obtain professional advice promptly rather than assuming informal correspondence preserves your rights. Before completion, the better practical objective is clarity: understand the measurement, the legal description and any proposed correction before committing further. Ask your own notaire to assess the actual documents and applicable remedy.
Keep off-plan and resale evidence separate
A resale apartment can be visited and measured in its present form. An off-plan purchase involves a property still to be built and contractual plans describing the intended accommodation. Tournaire’s guidance distinguishes vente en l’état futur d’achèvement, or VEFA, from the Carrez regime discussed here. Do not transplant the resale remedy into a new-build reservation without advice.
For an off-plan shortlist, preserve the developer’s complete supplied plans, including every level and the area schedule. Ask which area definition the contract uses and how later revisions will be documented. Keep balconies, terraces and annexes visible as separate entries. An illustrative furniture layout helps you think about daily use; it does not certify a finished measurement.
If comparing new-build with resale, label both evidence types plainly. A planned habitable-area figure and an existing Carrez report should not be treated as identical merely because both use square metres. Request an explanation of the differences that matter for the specific properties, rather than trying to convert between them with a general percentage.
There is also a timing issue. Store the version used when you made your decision, along with subsequent revisions. Otherwise, an updated sales brochure can leave you unsure whether the number changed or you remembered it incorrectly. Clear version records are useful without turning an ordinary purchase into an archive project.
Leave the viewing with a usable answer
By the end of this check, you should be able to describe the apartment in one ordinary sentence: its documented area, the nature of any additional space, and the annexes included. If that sentence still depends on unexplained qualifications, the buying file needs more work. The aim is confidence in the description, not a larger headline number.
For a non-resident buyer, appoint one person to collect the answers and keep the file consistent. Save the advertisement, measurement report, full plans and relevant written explanations together. Share the same set with your adviser. This small discipline avoids an agent, a buyer and a notaire each discussing a different version of the property.
Finally, return to the room itself. Sit where the dining table will go. Walk around the bed. Check the awkward corner under the roof. Legal area protects the transaction’s accuracy; practical observation tells you whether you will enjoy owning the place. You need both, preferably before the celebratory lunch.
If you are comparing Alpine apartments from abroad, speak to DOMOSNO about your shortlist and the space your household actually needs. We can help organise the property information and identify the questions to take to your notaire before you proceed.
