Valid in principle, but strongly discouraged
A verbal lease is legally valid under Belgian civil law — the Civil Code does not require a specific form for lease contracts. However, regional legislation now requires a written document for primary residence leases. A verbal lease is very difficult to prove, cannot be registered, and does not protect the tenant if the property is sold.
The principle of consensualism in Belgian contract law means that a lease is formed by the mere agreement of the parties on the property and the rent. A written document is not technically needed for the contract to exist.
However, the practical consequences of a verbal lease are overwhelmingly negative for both parties, particularly the tenant.
Consequences of a verbal lease
| Aspect | Written lease | Verbal lease |
|---|---|---|
| Proof of terms | Clear and certain | Very difficult to prove |
| Registration | Possible (mandatory) | Not possible |
| Enforceable against third parties | Yes (if registered) | No |
| Tenant protection on sale | Yes (if registered) | No — new owner not bound |
| Rent indexation | Possible (if clause + registered) | Not possible |
| Legal protections | Full regional protections | Uncertain application |
| Deposit management | Structured (blocked account) | No formal framework |
A verbal lease leaves both parties exposed to disputes about the agreed terms. Without a written document, it is virtually impossible to prove the exact rent, duration, charges or other conditions.
If you currently have a verbal lease, it is strongly recommended to formalise it in writing as soon as possible. Either party can require the other to sign a written lease, and refusal may constitute a breach of the obligation to cooperate in good faith.
How to prove a verbal lease
In the absence of a written lease, the existence of a rental relationship can be proven through:
- Rent payment records (bank transfers, receipts)
- Correspondence between landlord and tenant (emails, messages)
- Witness testimony (neighbours, family members)
- Domicile registration at the property address
- Utility bills in the tenant’s name
- Insurance documents for the property
However, even if the existence of the lease can be proven, the specific terms (duration, notice period, indexation) will be very difficult to establish. The court may apply the default legal rules (9-year lease, standard notice periods) in the absence of evidence of different terms.
BailBelgique allows you to create a compliant written lease in minutes, even if you have been renting verbally. The platform generates a lease that can be signed and registered immediately.
Regional specifics
Brussels-Capital Region
The Brussels ordinance of 27 July 2017 requires a written lease for primary residences. The written form is considered a condition for the application of the regional tenant protections.
Walloon Region
The Walloon decree of 15 March 2018 similarly requires a written lease. The decree specifies the minimum content that must appear in the lease document.
Flemish Region
The Flemish Housing Rental Decree of 9 November 2018 requires a written lease and provides a mandatory template. A verbal lease in Flanders cannot benefit from the decree’s tenant protections.
Belgian Civil Code, Art. 1714 (consensualism) + Regional housing legislation (written form requirement) — Verbal leases are valid but cannot be registered or fully enforced.