Garden house, carport, shed: when do I need a building permit?

Whether a garden house, carport or shed needs a building permit depends on the federal state, the size and the location. Building regulation law is state law, which is why the limits differ. Permit-free structures too must comply with the rules.

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Building regulation law is a state matter. Smaller ancillary structures are, depending on the state building code, procedure-free up to a certain size (often by enclosed volume), but that does not replace the duty to comply with the substantive rules.

Permit-free structures too must observe distance areas, the development plan and neighbor law. An illegal structure can lead to demolition, even if it is small.

What you should do now

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1. Check the state rule
Look in the state building code for up to which size ancillary structures are procedure-free.
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2. Clarify the location
Check the development plan, distance areas and boundary distances to the neighbor.
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3. Ask the building authority
In doubt, obtain information from the building authority or a preliminary building inquiry.
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4. Apply for a permit
If a permit is needed, submit the building application with the required documents.

How to spot the scam

You build directly on the boundary without checking distance areas.
The development plan prohibits the project.
A garden house that is too large is erected without a permit.

Frequently asked questions

Is a garden house always permit-free?

No. Whether it is permit-free depends on the state building code, the size and the location. Smaller structures are often procedure-free, larger ones need a permit. Decisive is the rule of your federal state.

Must I keep distances to the neighbor?

Yes, generally also for permit-free structures. Distance areas and boundary distances result from the state building code and partly from the development plan. Building directly on the boundary is only permissible under certain conditions.

What threatens with an illegal structure?

The authority can prohibit use and order demolition, even for smaller structures. In addition, fines threaten. A preliminary building inquiry or information from the building authority before starting construction protects against expensive mistakes.

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General information for self-help, not legal advice (RDG). In case of a high loss or uncertainty: contact a consumer advice center or a lawyer.