In France a signed compromis comes with a ten-day right to walk away. In Luxembourg it does not. The moment both sides agree on the thing and the price, the sale is legally formed, which makes the drafting of that document the most consequential hour of the entire purchase.
No cooling-off period, and case law says so plainly
Luxembourg courts have held for decades, including a Tribunal d'arrondissement de Luxembourg judgment from 1961 that is still cited today, that a sale of immovable property under private signature is complete as soon as the document records agreement on the thing and the price. There is no statutory reflection period afterward, unlike the ten calendar days a French buyer gets under the loi Macron. Once you and the seller have both signed, you are both bound, full stop, subject only to whatever conditions you wrote into the document.
This single difference from the French system is the reason Luxembourg notaries are so insistent on getting the compromis right the first time. There is no second chance built into the law. The protection has to be built into the contract.
The financing condition is not optional
The clause that matters most is the condition suspensive d'obtention de prêt, the suspensive condition tied to mortgage approval. If it is properly drafted and your bank refuses financing within the stated window, the compromis falls away automatically and without penalty. Leave it out, or accept a vaguely worded version, and a refused mortgage becomes your problem alone: the seller keeps your deposit and can pursue you for the difference if the property is resold at a lower price.
A properly drafted financing condition specifies the loan amount, an outside deadline for obtaining an offer, and what counts as proof of refusal. Banks in Luxembourg will usually provide a formal refusal letter on request precisely because this clause exists; ask for one in writing the moment a loan is declined, and do not let the deadline in the compromis pass while you wait for it informally.
What the document must actually contain
Beyond the price and the identity of the parties, a Luxembourg compromis worth signing includes a clear description of the property referencing the cadastral record, a statement of any known servitudes or easements, the date by which the notarial deed must be signed (commonly three to six months out), what exactly is included in the sale down to fixtures and appliances, and who bears which costs between signature and completion. If the property is sold with tenants in place, the compromis needs to say so and to set out what happens to the lease.
The energy performance certificate is not something you negotiate for at this stage: Luxembourg law requires it to be available to a prospective buyer from the moment the property is advertised, so by the time you are drafting a compromis you should already have seen it. If you have not, ask before you sign anything.
The deposit, and what happens if either side backs out
Market practice puts the deposit, generally called the acompte or dépôt de garantie, at around 10 per cent of the price, held on a notary's escrow account rather than paid directly to the seller. The consequences of walking away are asymmetric and worth understanding before you commit funds. A buyer who withdraws without a valid contractual reason typically forfeits the deposit to the seller as compensation. A seller who backs out is generally required to repay double the deposit. Neither of those remedies requires a lawsuit to establish in principle; they follow from the clause pénale written into the compromis, which is exactly why that clause needs to be there rather than assumed.
None of this applies if a genuine suspensive condition, financing being the standard one, simply fails to materialise. That is the whole purpose of writing the condition in: it converts an open-ended commitment into one with a defined exit.
Signing without a notary is legal, but rarely a good idea
A compromis can be signed under private signature, between the parties directly, without a notary present. It happens, particularly in private sales between people who already know each other. It is not recommended for anyone else. A notary at the compromis stage checks the property's legal status at the land registry, confirms there are no undisclosed mortgages or charges, and drafts language that has already survived contact with Luxembourg case law. The fee for this involvement is modest against what a badly worded clause can cost later, and engaging the notary here rather than only at the deed stage is the difference between understanding what you signed and finding out the hard way.
Registration, and the ten-day clock that does exist
There is no cooling-off period, but there is a registration deadline: the seller is generally required to register the compromis with the Administration de l'enregistrement within ten days of signature. This is an administrative formality with tax consequences rather than a consumer protection, and it runs regardless of whether either party has changed their mind. Confirm with your notary that this step has actually happened; an unregistered compromis can create complications later that are entirely avoidable.
Between the compromis and the deed
The gap, usually three to six months, is when the practical steps happen: your bank finalises the mortgage offer, the notary carries out title and encumbrance checks, and if the property is in co-ownership you should be requesting the last three years of service-charge accounts and the minutes of the last two general meetings. This is also the point to arrange a valuation if you have not already, and to line up buildings insurance to take effect from the date of the deed rather than scrambling for it in the final week.
Read the draft deed itself before the signing appointment, not during it. Luxembourg notaries will send it in advance precisely so that questions can be asked while there is still time to answer them, and a rushed reading at the signing table is not a substitute for a calm one beforehand.
What we tell first-time buyers
Treat the compromis, not the notarial deed, as the moment you are actually committing. Everything you would want to negotiate, everything you would want protection against, needs to be in that document, because there is no statutory window afterward to reconsider. A compromis you signed in a hurry, on a seller's timetable, without your own notary present, is the single most common origin of the disputes that later end up in front of a Luxembourg court.
Editorial note: Contract law and standard market practice can shift, and every transaction has its own facts. This article is a framework, not advice on a specific compromis. Have your notary review the exact wording before you sign.
Questions worth carrying into real life
For the luxembourg compromis de vente: what has to be in it before you sign, the final test is whether the advice survives contact with an ordinary week.