New rules for Attefallshus – build 50 m² without a building permit or a building notification!

On 22 October the Parliament decided that as of 1 December 2025 new, simpler rules will be introduced for building an accessory dwelling unit, often called Attefallshus.

The purpose is to make it easier for private individuals to create additional living space, whether it's a holiday home, multi-generational housing or a guest house directly on their own plot.rnThe new proposal means that in many cases you can build without a building permit or a building notification, as long as your house complies with the new limits.

What you are allowed to build – inside and outside the detailed development plan:

Inside the detailed development plan:

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• An accessory dwelling unit of up to 30 m².
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• The house must be smaller than the main building on the plot.
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• Maximum permitted height: 4.0 meters to the ridge.
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• The building must be placed within the property boundary.
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• The total combined area for all accessory buildings (e.g., sheds, guest cottages, Attefallshus) may be a maximum of 45 m².
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Outside the detailed development plan:

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• An accessory dwelling unit of up to 50 m².
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• The house must be smaller than the main building.
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• Maximum permitted height: 4.5 meters to the ridge.
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• Must be placed within the property boundary.
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• The total combined area for all accessory buildings on the plot may be a maximum of 65 m².
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Important limitations to be aware of

The new rules do bring simpler processes but also greater responsibility for you as a builder.rn

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• No building permits or start notices are required, which means neighbors cannot appeal in advance.
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• You must yourself ensure that the house meets all technical requirements applicable to dwellings, such as fire protection, water and sewage, noise and ventilation.
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• The municipality can intervene afterwards if the house does not meet these requirements.
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• The building must not be placed outside the property boundary, and the total area is combined with other buildings on the plot.
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What does this mean for you who want to build Attefallshus in 2026?

For you who dream of a modern Attefallshus on your plot, as extra accommodation, a guest house or a place to rent out, the change provides a significantly easier path to starting construction.rnYou avoid time-consuming building permit processes, but at the same time take on greater responsibility for ensuring the building meets all regulations. So it becomes easier to realize housing dreams, but it is important to choose experienced suppliers and house models that already meet the requirements.

When did these rules come into effect?

The proposal for the new rules for Attefall houses came into force on December 1, 2025, and applies to everyone who wants to build Attefall houses in 2026 and onwards.

Do you want to stay updated on what the new rules mean in practice, and how you can plan your permit-free house according to the new possibilities? Contact us and we'll tell you more about our turnkey Attefall houses that meet the requirements.