Short answer: On a shared lease in Belgium, one co-tenant usually can leave without ending the whole lease — but not simply by walking out. They must give notice to the landlord and the other co-tenants, and to be fully released they normally need to arrange a replacement the landlord and remaining tenants accept. Until that happens, joint liability means everyone can be held to the full rent. The exact notice period and rules differ by region — Flanders, Brussels and Wallonia each handle this differently.

First: are you all on one lease?

Co-tenancy questions only arise when several people signed the same lease. If each person has a separate contract for their own room, they each give notice on their own. This article is about the common case: two or more people named on one shared lease for the same home.

Nearly all shared leases contain a solidarity clause (joint and several liability). Practically, this means the landlord can claim the entire rent from any single co-tenant if the others do not pay — the person who pays then has to recover the shares from the others. This clause is the reason a clean departure matters so much.

Flanders — the Woninghuurdecreet

Under the Flemish Woninghuurdecreet, a contractual co-tenant can end their part of the lease individually, at any time, with a notice period of three months, served on both the landlord and the other co-tenants. During the first three years there is no early-termination penalty for this individual exit.

To be released cleanly, the departing co-tenant may propose a replacement. The landlord and the remaining co-tenants can refuse that candidate, but only on "grounded and reasonable grounds". If a replacement is accepted, the departing tenant is released once the notice period ends. If no acceptable replacement is found — or none is proposed — the departing co-tenant can remain jointly liable for the rent for up to six months after they stop being a tenant. The departing tenant is generally expected to show an active and genuine effort to find a replacement.

Brussels and Wallonia — the "bail de colocation"

Brussels and Wallonia have a dedicated co-tenancy lease (bail de colocation) that comes with a mandatory co-tenancy pact (pacte de colocation) signed between the co-tenants. The pact sets out, among other things, how rent and charges are split and how the arrival, departure and replacement of a co-tenant are handled.

When one co-tenant wants to leave, the notice period is generally two months in Brussels and three months in Wallonia, given to the landlord and the other co-tenants. To be freed from the lease obligations, the departing co-tenant is normally expected to find a replacement accepted by the landlord and co-tenants, or to show a genuine and sufficient search. If they do not, they can remain bound — commonly for around six months after the notice — and in Wallonia the rules also foresee an indemnity to the remaining co-tenants where no replacement is arranged. Because these details vary, check your regional lease and pact.

What the departing tenant should actually do

• Give written notice to the landlord and every co-tenant, respecting the regional notice period;
• Actively look for a suitable replacement and keep evidence of the search;
• Have the replacement sign an amendment (rider) to the lease so the change is documented;
• Agree with the remaining co-tenants how the deposit share and any handover are settled — this often lives in the co-tenancy pact.

What the landlord and remaining tenants should watch

Landlords cannot refuse a reasonable replacement without grounds, but they are entitled to check the newcomer's solvency and identity on the same lawful basis as any applicant. The remaining co-tenants should confirm, in writing, how the rent is now split and update the co-tenancy pact. Keeping the lease, the rider, and the notice letters in one place avoids the classic dispute months later over who was still liable for what.

Keep a shared lease clear for everyone

Most co-tenancy disputes come down to one thing: nobody kept the notice letters, the lease rider and the payment split in one place. ImmoDesk keeps the lease, documents and messages between everyone in one shared, timestamped record, so a co-tenant leaving is a clean handover rather than an argument months later. Renting from a landlord who isn't on ImmoDesk yet? Create your free tenant account and invite them. Landlords managing shared leases can start free — no credit card required.

This article is general information about co-tenancy in Belgian residential rentals as of 2026 and is not legal advice. The rules differ significantly by region (Flanders, Brussels, Wallonia) and depend on your specific lease and co-tenancy pact — verify the current rule for your situation or consult a tenants' service, a notary or a professional.