Monaco Property Due Diligence: What to Check Before You Sign

Due diligence in Monaco is shared. The notary checks the seller's title and the legal situation of the property, and Monaco's anti-money-laundering rules mean the professionals involved check you. But many of the questions that decide whether an apartment is right, and fairly priced, are the buyer's to ask: what exactly is being sold, what rules apply to the building, what the co-ownership has decided, and what the purchase will cost in your structure.

This guide sets out what to check before signing the preliminary agreement in Monaco, and why each point matters. It complements our guides to the Monaco purchase process from offer to keys and buying property in Monaco.

Why the timing matters

Most of the leverage in a Monaco purchase sits before the preliminary agreement, the compromis de vente. Once it is signed and the deposit, usually 10% of the price, has been paid to the notary, the conditions written into that agreement are what protect you. Anything you want to verify, and any condition you want to rely on, should be identified at the offer stage.

1. What exactly is being sold

The lots

In a Monaco building, an apartment, a parking space and a cellar are often separate lots, each with its own legal description and value. Confirm which lots are included in the sale, whether parking is owned or merely rented, and where the space is. In a city where parking is scarce, the difference matters.

Measured areas

Listings may present interior space, terraces and annexes together. Ask for the areas separately, and for any plans or measurement documents that support them. Terraces are valuable in Monaco, but they are not interior living space, and price comparisons only work like for like.

Condition and authorized works

If the apartment has been renovated, ask what was done and what authorizations were obtained. Renovation in Monaco requires approvals and coordination with the building, and unauthorized changes can create problems later.

2. The building's legal status

The protected sector

Some Monaco housing falls under Law No. 1.235 of December 28, 2000, which governs the rental of certain residential premises, principally those built or completed before September 1, 1947. In this so-called protected sector, the choice of tenant is constrained, rents are capped and tenants have renewal rights.

For a buyer, that changes the economics and, in some cases, the use of the property. If you plan to rent the apartment, or if it is currently let, find out whether the protected-sector rules apply before you make an offer.

Occupancy

Confirm whether the apartment will be delivered vacant. If there is a tenant, read the lease, the rent, the deposit and the notice terms, and take advice on what the tenancy means for your plans.

3. The co-ownership

Most Monaco homes are apartments in co-owned buildings. Before you commit, ask for:

• Service charges, what they cover and how they have changed

• Recent decisions of the co-owners, including disputes or unpaid charges

• Planned works, such as facades, elevators, waterproofing or common areas, and how they will be paid for

• Building rules, including any limits on use, renovation or rentals

• Services, such as concierge, security, pools or fitness rooms, which add comfort and cost

A beautiful apartment in a building facing major works carries a bill you will share.

4. The purchase agreement

The preliminary agreement sets the price, the conditions and the timetable. Read it with independent advice, and check in particular:

• Conditions. If you need a mortgage, the financing condition should state the amount, the terms and the deadline. Add any other condition you intend to rely on.

• The deposit. When it is due, who holds it and what happens to it if a condition fails or a party withdraws.

• Dates. The deadline for signing the final deed, and what happens if it is missed.

• What is included. The lots, fixtures, furniture and any parking or storage.

• Costs. Who pays which fees, including any agency fee.

5. Your purchasing structure and its costs

How you buy affects what you pay. For an individual buying an existing apartment, registration duties are 4.75% and notary fees about 1.5%, roughly 6.25% in total before agency fees. Higher duties apply to some company purchases, rising to as much as 10% where the beneficial owners are not disclosed. Property held through companies also carries annual declaration requirements.

Choose the structure with legal and tax advice before you make an offer, because the choice is difficult to change afterward and determines the costs written into the agreement.

6. Proof of funds and anti-money-laundering checks

Monaco's anti-money-laundering rules, set mainly by Law No. 1.362 of August 3, 2009, as amended, require real estate professionals and notaries to identify their clients, including the beneficial owners of companies and trusts, and to understand where the funds come from. Expect to provide identification, documents showing the origin of the purchase money and, for structures, information on their ownership. Preparing these early avoids delays at the most sensitive point of the transaction.

7. Financing

If you are borrowing, start early. Lenders in Monaco review income, assets and the origin of funds, often in depth. Make sure the loan timetable fits the dates in the preliminary agreement, and that the financing condition matches what the lender is actually likely to offer.

8. Residency, if it is part of the plan

Owning an apartment does not, on its own, give you the right to live in Monaco. A residence permit requires suitable accommodation, sufficient financial resources and good character. If residency is a goal, check that the apartment suits your household and plan the application alongside the purchase, with qualified advisers. Our Monaco residency guide explains the requirements.

9. The professionals involved

Real estate transaction and management activities in Monaco are regulated by Law No. 1.252 of July 12, 2002. Implementing rules updated in 2021 raised the qualification requirements and the minimum financial guarantee for professionals. A reform bill filed in September 2025 proposes further changes, so the framework may evolve. Make sure the agency handling the transaction is authorized to operate in Monaco, and that independent lawyers and tax advisers review the points beyond the notary's role.

A Monaco due diligence checklist

• Confirm which lots are included: apartment, parking, cellar

• Obtain the interior area, terraces and annexes separately

• Check what renovation work was done and what was authorized

• Ask whether the protected-sector rules apply to the building

• Confirm whether the apartment will be delivered vacant

• Review service charges, recent co-ownership decisions and planned works

• Read the building rules, including any limits on rentals

• Decide the purchasing structure, with advice, before the offer

• Confirm registration duties, notary fees and agency fees in writing

• Prepare identification and proof of the origin of funds

• Align financing deadlines with the preliminary agreement

• Plan the residency application if you intend to live in Monaco

• Confirm the agency is authorized in Monaco and take independent legal advice

Red flags to take seriously

• Areas that cannot be broken down or supported by documents

• Parking or storage described vaguely, or rented rather than owned

• Reluctance to share co-ownership charges or recent decisions

• Pressure to sign the preliminary agreement before you have advice

• Uncertainty about whether the building falls in the protected sector

• A structure proposed without a clear explanation of its costs

Frequently asked questions

Does the notary handle all due diligence in Monaco?

No. The notary verifies the seller's title and the legal situation of the property and handles the formalities of the sale. Checks on the building, the co-ownership, the apartment's condition, the areas and the purchase structure are largely the buyer's responsibility, with their advisers.

What is Monaco's protected sector?

It is a category of housing governed by Law No. 1.235 of 2000, mainly covering premises built or completed before September 1, 1947. Rents are capped, the choice of tenant is constrained and tenants have renewal rights.

When should due diligence be done?

As much as possible before signing the preliminary agreement, when you can still negotiate the price and the conditions.

What documents should I prepare as a buyer?

Identification, proof of the origin of funds, financing documents if you are borrowing and, if you buy through a company or trust, information on its ownership.

Final perspective

Monaco's purchase process is well regulated, but regulation is not the same as suitability. The buyers who are happiest with their purchase are the ones who knew exactly what they were buying, what rules applied to it and what it would cost in their structure before they signed.

Asher works alongside experienced, locally licensed Monaco professionals, giving international clients one English-speaking point of contact through the search, the negotiation and the checks. Learn more on our Monaco page, or contact Asher to discuss a purchase.

Sources

• CMS Monaco, construction projects in the protected sector (opens in a new tab), December 13, 2021, on Law No. 1.235 of December 28, 2000.

• CMS Monaco, anti-money-laundering best practice in the real estate sector (opens in a new tab), April 12, 2024.

• Valeri Agency, strengthened conditions for real estate professionals in Monaco (opens in a new tab), on Sovereign Order No. 8.860 of October 15, 2021.

• CMS Monaco, bill No. 271 on reforming the real estate professions (opens in a new tab), September 26, 2025.

• Knight Frank, buying property in Monaco (opens in a new tab), on registration duties by type of buyer.

• Petrini, the notaries of Monaco (opens in a new tab).

• Government of Monaco, how to apply for a residence permit (opens in a new tab).

This guide is general information as of October 2026. It is not legal, tax or immigration advice.