No, a notarized lease is not required
Belgian law does not require a notarized lease for residential or commercial tenancies. A private agreement (sous seing prive) signed by both parties is fully valid. It can be registered with the FPS Finance and presented in court. Notarization is optional and offers additional guarantees, but it is not mandatory.
The vast majority of leases in Belgium are private agreements — simple contracts signed by the landlord and tenant without a notary’s involvement. This is perfectly legal and is the standard practice for both residential and commercial leases.
The only situation where notarization is legally required is for very long leases (emphyteusis or building rights exceeding 99 years), which are rarely used for standard residential or commercial tenancies.
A written lease is mandatory for residential tenancies, but the writing requirement does not imply notarization. A lease created online has the same legal value.
When notarization can be useful
Although not required, a notarized lease offers specific advantages:
| Feature | Private lease | Notarized lease |
|---|---|---|
| Legal validity | Valid | Valid |
| Cost | Low (free to ~100 EUR) | 300-600 EUR |
| Executory force | No (court order needed) | Yes (direct enforcement) |
| Date certainty | From registration | From notarization date |
| Automatic registration | No (manual via MyRent) | Yes (notary handles it) |
| Identity verification | By the parties | By the notary |
A notarized lease may be worth considering when:
- The rent is very high and you want direct enforcement without court proceedings
- There are complex arrangements (mixed use, long duration, specific clauses)
- The parties want maximum legal certainty
- The landlord wants executory force for rent collection
For standard residential leases, a private agreement created via BailBelgique is sufficient and far more cost-effective than a notary. The platform includes all mandatory clauses and handles electronic signature and registration.
Executory force: the key difference
The main advantage of a notarized lease is executory force (titre executoire). This means:
- If the tenant does not pay rent, the landlord can engage a bailiff directly without going to court first
- The bailiff can seize the tenant’s goods or income based on the notarized lease alone
- This saves time and legal fees compared to obtaining a court judgment
Without notarization, the landlord must first obtain a court order from the Justice of the Peace before any enforcement action. This typically adds 2-4 months and several hundred euros in legal costs.
However, executory force only applies to monetary obligations (rent and charges). For other disputes (lease termination, maintenance obligations, etc.), court proceedings are required regardless of whether the lease is notarized.
A notarized lease does not prevent disputes — it only speeds up enforcement of rent payments. For most landlords, the additional cost of notarization (300-600 EUR) is not justified when lease registration already provides the essential protections.
Regional specifics
Brussels-Capital Region
Notarization is not required under the Brussels Housing Code. The vast majority of leases in Brussels are private agreements. Notaries in Brussels can draft leases in French or Dutch.
Wallonia
The Walloon Residential Lease Decree does not require notarization. Walloon notaries offer lease drafting services, but the cost is typically not justified for standard residential leases. Rural properties with complex arrangements may benefit from notarial involvement.
Flanders
The Flemish Housing Rental Decree does not require notarization. Flemish notaries can draft leases in Dutch. For properties in Flanders, remember that the lease must be in Dutch regardless of whether it is notarized or not.
Belgian Civil Code — No general notarization requirement for leases. Only emphyteusis and building rights exceeding 99 years require notarization. Regional housing legislation confirms that private agreements are sufficient.