Building permits and attefall rules for cabins

When is a building permit required?

• New residential buildings, outbuildings, garages or large complement buildings
• Extensions that add volume (except small attefall extensions)
• Change of use, e.g. storage becoming living space
• Facade changes within a detailed plan area (colour, material, windows)
• Signs, walls, fences and large decks

Attefall house (up to 30 m²)

Since 2020 an attefall house may be up to 30 m² floor area (up from 25 m²). It must be placed close to the main house, with a ridge height of max 4.0 m, and may be used as a permanent home, guest cabin or complement building. No permit is needed, but you must file a notification with the municipality and receive a start approval before you begin. Placement closer than 4.5 m from the plot line requires the neighbour's consent.

Attefall extension (up to 15 m²)

You may extend the main house by up to 15 m² gross area without a permit but with a notification. The extension may not exceed the ridge height and may not be added to a building of cultural-historic value.

Friggebod (up to 15 m²)

You may build one or more friggebods with a combined footprint of up to 15 m² and ridge height max 3.0 m without any permit or notification. They must be close to the main house and at least 4.5 m from the plot line (or the neighbour must consent).

Decks, canopies and walls

• Canopy over patio/entrance: up to 15 m² without permit
• Low decks (under about 1.2 m above ground) usually need no permit
• Fences and walls above 1.1 m usually need a permit
• Always check the detailed plan and setback distances

Shoreline protection (strandskydd)

Within 100 m of the shoreline (sometimes extended to 300 m) shoreline protection applies. You may not build anew, extend buildings so they take more ground, or block public access. Building inside a protected zone requires an exemption from the municipality — including attefall houses and friggebods. An established homestead zone around the main house can allow some works, but always ask the municipality.

Practical tips

• Call the building committee early — they answer preliminary questions for free
• Check the detailed plan for the property (municipality or Lantmäteriet)
• Use an architect or certified control officer for larger projects
• Expect 10–12 weeks for a permit and 4–8 weeks for an attefall notification
• If unsure, request a written pre-decision before planning further