How to read a French co-ownership bylaw before you buy

Everyone reads the listing, many read the general-assembly minutes, almost nobody reads the règlement de copropriété (RCP — the co-ownership bylaws) before making an offer. Yet this is the document that decides what you will be allowed to do with the property: short-term rental, running a business, converting a commercial unit, splitting a floor. A two-line clause drafted in 1962 can make your business plan illegal — and it binds you from the day you buy.

At PropHound we analyse co-ownership bylaws every day for our own acquisition desk. Here is the method we apply, clause by clause.

First: get the right document, complete

The seller must provide the RCP (it is part of the mandatory ALUR-law document pack), but you can — and should — demand it before the offer. Ask for:

• the original bylaws with the description of division (EDD), the lot-by-lot inventory;
• every amendment (modificatif) published since — they sometimes change the building's destination or the lot shares;
• the last three general-assembly minutes, to check no recent resolution tightened the rules.

An RCP without its amendments is worthless: it is often a 1998 modificatif that banned "any short-stay letting". If the seller stalls, the building manager (syndic) or the land registry can provide a copy.

1. The building's destination: the master clause

Find the chapter on "destination de l'immeuble" or "usage des lots". Three broad families:

• Habitation exclusive — residential use only. Any activity, even a liberal profession, is excluded. Short-term rentals are highly attackable.
• Habitation bourgeoise (simple) — residential plus, usually, liberal professions. Case law on short-term rentals here is shifting: everything turns on the exact wording.
• Habitation exclusivement bourgeoise — the strictest. French supreme-court rulings regularly find furnished tourist lettings incompatible with it, as a de facto commercial operation.

The word to hunt for is « exclusivement ». Between "habitation bourgeoise" and "habitation exclusivement bourgeoise" lies the whole difference between a viable project and a lawsuit you lose before it starts. Read the clause against your actual target activity: a serviced coliving is defended differently from a plain flatshare, an office differently from a business receiving clients.

2. Private-area usage clauses

Beyond the general destination, the RCP often gets specific: no signage, no storage, no trade "even temporarily", duty to preserve the building's "standing", bans on "incessant comings and goings". These clauses are what co-owner associations use to attack short-term rentals even when the destination looks permissive. Note each one with its page number — if you buy, your lawyer will ask.

3. The EDD: what you are actually buying

The description of division lists every lot, its designation ("cellar", "service room", "three-room apartment") and its share of the common parts (tantièmes). Check:

1. The lot's designation matches today's use. An "office" sold as a flat, a maid's room merged without an amendment: regularising costs a general assembly, tantièmes, sometimes years.
2. The annexes legally exist. Is the "private" terrace a lot, an exclusive-use right, or mere tolerance?
3. The tantièmes — they set your voting weight and your share of charges, including future works.

4. Charges and works: the financial read

The RCP defines the allocation grids (general charges, lift, heating). Cross-check with the assembly minutes: a façade renovation voted but not yet called is your first-year cash flow gone. Watch for special allocations too — a ground-floor lot paying for the lift is a price-negotiation argument.

5. "Deemed unwritten" clauses: don't dismiss them too fast

Some old clauses are illegal today (blanket bans on letting, for instance). But "deemed unwritten" does not mean "without practical effect": until a judge says so, the co-owners' association can invoke it and force you into proceedings. Price that risk into your offer and your timeline, not into the "we'll see" column.

The 30-minute checklist

That last step matters most: a useful opinion quotes the exact clause. "Should be fine" is not an analysis.

Five red flags that should reprice your offer

Reading the RCP is not only a go/no-go exercise — it is a pricing tool. Each of these findings is worth a discount, because each one transfers a cost or a risk onto you:

• an « exclusivement bourgeoise » destination when your plan involves any form of letting beyond a bare long-term lease;
• a lot whose designation does not match its current use (regularisation = assembly vote + fees + delay);
• annexes occupied by tolerance rather than by title — a terrace or attic you could lose at the next assembly;
• an allocation grid that loads your lot disproportionately (lift for a ground floor, heating for a renovated unit);
• litigation mentioned in the minutes between the association and an owner doing exactly what you plan to do.

A seller rarely negotiates against case law; quote the clause, quote the ruling pattern, and let the price absorb the risk.

Our shortcut (of course we built one)

We used to do this read manually on every building our own desk targeted. It became PropHound's Compliance module: upload the RCP, state your target activity (short-term rental, coliving, offices, F&B…), and the analysis returns a verdict with the clauses quoted — the one that allows, the one that blocks, the one in the grey zone. The free plan includes a full analysis; paid plans add more every month.

And before the bylaws, make sure the price itself holds up: our guide DVF: the true price per m² of any French address shows how to check a price against actually-signed sales — city medians are on our price-per-m² pages.

This article is a reading method, not legal advice: for a committed purchase, have the grey zones validated by a lawyer or notary.