Who Helps You Avoid Mistakes When Buying in Paris?

The question comes up at almost every first meeting, phrased more or less the same way: “who is going to stop me making a mistake?” It is a fair question. A Paris purchase involves several hundred thousand euros and a dozen checks that are anything but intuitive. It deserves a precise answer, and that answer is not a single name: it is a chain of six professionals, only one of whom works for the buyer from start to finish.

Who does what, and above all who does not

Professional	What they secure	What they do not cover	When they step in
Notaire	Title deed, easements, planning status, 10-day cooling-off period, deed of sale	Does not view the property, does not comment on the price paid	After the offer is accepted
ADIL de Paris	Free, neutral legal information on housing	Does not view, negotiate, or assess a specific property	At any point, upstream
Surveyor	EPC, asbestos, lead, electrics, gas, Carrez floor area, risk statement	Hired and paid by the seller, does not price future works	Before the preliminary contract
Managing agent	Co-ownership statement, general meeting minutes, maintenance record	Does not speak to the buyer: documents pass through the seller	Before the preliminary contract
Broker	Financing plan, rates, borrower insurance	Assesses neither the price nor the health of the building	Upstream, then after the offer
Architect or project manager	Feasibility and costing of works	Only involved if instructed, and charges per assignment	Ideally during the viewing
Estate agent	Marketing the property	Does not represent the buyer: the mandate comes from the seller	During the viewing
Property hunter	Brief, real prices, off-market, co-ownership, negotiation, follow-through to the deed	Does not replace the notaire or the surveyor: they trigger both at the right moment	From day one to handover

This breakdown explains most unpleasant surprises. They almost never come from a professional doing their job badly: they come from the gaps nobody was mandated to cover.

The notaire: essential, but late

The notaire is a public officer. They verify the seller’s ownership, the absence of restrictive easements, the planning position, clear the 10-day cooling-off period and draft the deed of sale. Within that scope they are irreplaceable.

Two limits are worth knowing. The first is timing: they are instructed once the offer has been accepted, which is after the two decisions that cost the most, choosing the property and setting the amount. The second is scope: the notaire guarantees the legal soundness of the transaction, not its economic merit. They will not tell you that you are paying €40,000 too much, because that is not their remit.

One useful and little-known point: the buyer may appoint their own notaire alongside the seller’s, at no extra cost. The two firms then split the regulated fees. Many buyers give this up believing it doubles the bill.

The ADIL de Paris: the free, neutral opinion

The departmental housing information agencies are state-funded and provide free legal, financial and tax information, with no interest in the transaction going through. To understand a preliminary contract, the conditions of a subsidised loan or the rights of a sitting tenant, this is the best entry point on the Paris market.

Their remit stops where the ground work starts: the ADIL does not view apartments, does not compare two live offers and does not negotiate. It tells you what the law says, not what the property is worth.

The surveyor: a report pack paid for by the seller

The technical report pack attached to the preliminary contract covers the EPC, asbestos, lead, electrics, gas, the Carrez floor area and the risk statement. It is compulsory, it is reliable on what it measures, and it has a structural blind spot: the surveyor is chosen and paid by the seller, and the report describes a state at a given moment.

An F or G energy rating is a fact, not a quote. The question that actually decides the purchase, what an upgrade would really cost and whether the building would allow it, belongs to nobody in the standard process. That is exactly where the €30,000 to €80,000 gaps between planned and final budget appear.

The managing agent and the co-ownership: the costliest area

The co-ownership statement, the last three sets of general meeting minutes and the maintenance record tell the truth about a building: approved works, upcoming facade renovation, level of unpaid charges, state of the works fund. Under the ALUR act, these documents must be given to the buyer before the preliminary contract is signed.

You still have to read them and know what to look for. An approved but not yet invoiced facade renovation, proceedings against a co-owner, a lift near the end of its life: those lines are rarely highlighted, never commented on, and trigger no automatic warning. The managing agent forwards, it does not alert. At Home Select, reading these documents rules out 15 to 20% of properties before the second viewing.

The broker and the architect: two precise angles

The broker secures the financing: rate, term, borrower insurance, strength of the file with lenders. They comment neither on the price paid nor on the co-ownership. The architect or project manager turns a hunch about works into a number. Bringing them along during the viewing, rather than after the preliminary contract, often changes the nature of the negotiation: a costed quote is the strongest argument a buyer can put on the table.

The estate agent does not work for you

That is not a criticism, it is the law. The estate agent holds a mandate from the seller and owes them their duties: obtaining the best price on the best terms for their client. A buyer who mistakes their advice for an independent opinion has the wrong role in mind, not the wrong person.

For a professional to defend your interests, you have to be the one who mandates them. That is the whole point of the search mandate, governed by the Hoguet act of 2 January 1970 in the same way as a sales mandate, and reserved for holders of the carte T licence.

The property hunter: the only one the buyer mandates

The property hunter holds the only position covering the full chain, from brief to deed. In practice they work precisely where the others have no mandate:

• Before the search: turning a project into a costed brief, arbitrating between size, floor, neighbourhood and budget, ruling out incompatible wishes before they cost six months.
• During the search: covering listings, network and off-market. Home Select’s network of 15,000 partners, agents, notaires and managing agents, surfaces more than 100 off-market properties a day, while 15 to 25% of prime transactions close outside public listings.
• On each property: pre-viewing so that only serious options are presented, reading the co-ownership file, testing the asking price against actual sale prices from the DVF database, which puts Paris at €9,900 per sqm median and €11,100 average in the April 2026 vintage.
• At offer stage: building an evidenced negotiation. The average at Home Select is 6% off the seller’s price, several tens of thousands of euros on a typical Paris purchase.
• After the offer: instructing and coordinating the other professionals, checking the preliminary contract, tracking conditions precedent and the timetable through to signature at the notaire’s office.

They replace neither the notaire nor the surveyor. They do what nobody else is mandated to do: hold the chain together, and bring in each professional while there is still time for them to be useful.

The running order, in real life

1. First of all: a financing plan with a broker or your bank, and legal information from the ADIL de Paris if the structure is unusual (split ownership, SCI, sitting tenant).
2. As soon as the project is defined: a search mandate with a property hunter, to set the brief and open up off-market access.
3. During viewings: reading the co-ownership file and, as soon as works are involved, a costing from an architect or a builder.
4. Before the offer: testing the asking price against real local prices, analysing the co-ownership documents, calibrating the amount.
5. After the offer is accepted: the notaire, your own if you wish, review of the preliminary contract, the 10-day cooling-off period, conditions precedent.
6. Through to the deed: following the financing, any further surveys and the handover.

What it changes, in numbers

A buyer working alone in Paris spends an average of 6 months, more than 40 viewings and around 150 hours on the search. With Home Select, they sign in 45 days on average, after 3 viewings and some 15 hours of their own time. Notaire fees, which are regulated, represent 7 to 8% of the price for older property, including around 5.81% in transfer duties, against 2 to 3% for new-build: unlike the price of the property itself, they are not negotiable.

Home Select has been advising buyers in Paris and the Île-de-France since 2011, with 16 property hunters, more than 1,200 clients supported and a 4.8/5 rating on Google. The firm is a member of the FCI, the French federation of property hunters. Fees are 100% success-based: 2.5% of the purchase price under the Exclusive offer, with a €10,000 minimum, and 1.5% under the Confidentielle offer, reserved for projects of €2m and above. Until a deed is signed, nothing is invoiced. The service is set out in full on the buying search page, and a first conversation can be booked from the contact page.

So the right question is not “who will stop me making a mistake”, but “who is mandated to do so, and from when”. In Paris the answer fits in one sentence: the notaire at the end, the ADIL on the law, the surveyor on the current state, the managing agent on the building, and the property hunter throughout.