What does it mean?
Komplementbostad is the legal term for a standalone dwelling built on a lot that already has a residential building. The most common example is the Attefall house of up to 30 square meters, but the concept also covers converted friggebods (small outbuildings) and other types of added housing units.
An accessory dwelling must be an independent living unit with its own kitchen or kitchenette, bathroom, and sleeping area. It differs from an accessory building (like a garage or storage) by being intended for habitation. The municipality must issue start approval before construction. When rented out, the Private Rental Act applies if the owner lives on the same property, giving the tenant limited protection.
Key Points
- Legal term for standalone dwelling on a lot with existing residential building
- Most common type is the Attefall house (max 30 sqm)
- Must be an independent unit with kitchen, bathroom, and sleeping area
- Requires start approval from municipality — but not always a building permit
- Private Rental Act applies when rented out if the owner lives on the property
Practical Tip
Planning to build an accessory dwelling? Check the zoning plan and contact the municipality's building permit department early. Keep in mind that water/sewage connections and fire safety may require additional measures.
Legal Basis: Planning and Building Act Ch. 9