Quick answer
Under Article 260a of the Swiss Code of Obligations, alterations by tenants require the landlord’s written consent. A portable appliance without building alterations is different, but must still fit the lease and noise conditions. Clarify brackets, penetrations and connections before buying.
What needs planning?
Wheels do not automatically make every installation permissible. Outdoor brackets, drilling, window changes or work on shared building elements may require further consent. Even a portable outdoor unit must be secured and must not unlawfully disturb neighbours.
If permanent alterations remain uncertain, start with reversible measures: shading, suitable ventilation times or a fan. A window seal must not damage the frame and does not replace fall protection or burglary resistance.
Prepare a practical request
Do not hastily promise unlimited costs or future removal. Once consent has been given, Article 260a paragraph 2 permits the landlord to require reinstatement only where this was agreed in writing. Seek tenancy-law advice on the actual agreement if uncertain.
- Describe temperatures, times and affected rooms.
- Explain existing shading and ventilation measures.
- Include the model, location, connection route and noise data.
- Clarify responsibility for permits, costs, maintenance and damage.
- Obtain a written agreement before work starts.
What consent does not replace
A private agreement does not replace a required building permit. In a condominium, other owners’ rights may also be involved. Clarify who takes over the equipment when you move out and how servicing and repair access will work.
Frequently asked questions
Can I simply drill a hole for the hose?
Not without prior clarification and, for a building alteration, written consent. This also applies to window and façade components.
Must I always remove an approved system when moving out?
Not automatically. The written agreement and legal rules determine this. Clarify reinstatement expressly before investing.
Find a suitable installer
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Find companies by cantonSources and scope
For private households in Switzerland. Manufacturer information applies to the named models. Local requirements and system suitability need individual assessment. Sources link to their original language.
- Schweizerische Eidgenossenschaft: Obligationenrecht Artikel 260a ↗Checked: 2026-10-02
- Mieterinnen und Mieterverband Zürich: Zu heiss in der Wohnung vom 18. Juni 2026 ↗Checked: 2026-10-02