Subletting in Switzerland

When subletting an apartment in Switzerland is allowed

Under the Code of Obligations, a tenant may sublet all or part of a rented apartment as long as the landlord consents. Consent is not optional and not a formality to skip: a sublet arranged without it is a breach of the lease, even if the subtenant behaves well and pays on time.

The landlord cannot refuse consent arbitrarily. Refusal is only valid in three situations: the tenant declines to disclose the sublet's conditions, those conditions are unfair to the landlord (typically an inflated subletting rent), or the landlord can show reasonable objections to the sublet on grounds such as the subtenant's intended use of the flat or the length of the arrangement.

• •Ask for consent in writing before advertising the flat or accepting a subtenant.
• •Disclose the subtenant's identity, the sublet rent, and the intended duration when you request consent.
• •Keep the landlord's written approval on file for the whole subletting period.

How the subletting rent must be calculated

A subtenant cannot be asked to pay more than their proportionate share of the rent the original tenant pays, adjusted for any additional services or furnishings provided (for example a furnished flat, included utilities, or extra amenities). Charging a markedly higher rent than this proportionate share is treated as an unfair condition and gives the landlord grounds to refuse or challenge the sublet.

If only part of the flat is sublet, such as one room in a shared apartment, the subtenant's share is calculated against the surface or value of that portion relative to the whole. Tenants who sublet the entire flat for a period abroad usually pass on the full rent, sometimes with a modest adjustment for furnishings or included charges.

Who remains responsible during the sublet

The original tenant remains the sole party to the main lease with the landlord throughout the sublet. This means the tenant stays liable for the rent, for any damage to the flat, and for the subtenant's conduct, even while living elsewhere. The subtenant has no direct contractual relationship with the landlord.

Because of this, tenants who sublet should put a clear written sublease in place with the subtenant, covering rent, duration, deposit, condition of the flat at handover, and what happens if the subtenant needs to leave early. A verbal arrangement leaves the original tenant exposed if a dispute arises.

Practical points before you sublet or move into a sublet

A few checks reduce the risk of disputes on both sides of a subletting arrangement in Switzerland. They apply whether you are the tenant arranging the sublet or the person moving into a subletted flat.

• •Request the landlord's consent in writing and keep a copy for the full subletting period.
• •Set the subletting rent at or below the proportionate share of the main rent, adjusted only for genuine extras.
• •Sign a written sublease with the subtenant covering duration, deposit, rent, and condition of the flat.
• •Document the flat's condition with photos or a written inventory at both handover and return.
• •Clarify who registers with the commune (Einwohnerkontrolle) during the sublet, since residence registration rules vary by commune.
• •Check the notice period on the sublease so it does not outlast your intended return date or the main lease's own terms.

When subletting is not the right solution

Subletting suits situations with a defined end date: a posting abroad, a trial relocation, or a temporary absence where you intend to return to the same flat. It is a poor fit for an open-ended departure, where terminating the lease properly and finding a new tenant through the landlord is usually cleaner for everyone involved.

If your move to Switzerland is still at the planning stage and you are choosing a flat with a possible future sublet in mind, raise the question with the landlord or managing agency before signing, since some leases restrict or exclude subletting outright.