Am I allowed to build a garden house or pool without a permit?
Up to a certain size, yes. Whether a garden house needs a permit is set by your state's building code. "Permit-free" garden houses are usually allowed up to a gross volume of around 30–75 m³ — e.g. Bavaria 75 m³, Baden-Württemberg 40 m³, NRW 30 m³. Pools in your own garden are often permit-free up to 100 m³ (§61 model building code). But as soon as a toilet, shower, fireplace/heating or a habitable/living room is added, a permit is almost always required. The development plan and setback distances to neighbours also apply.
📋 The rules
- Permit-free usually up to 30–75 m³ gross volume — the limit is set by the state building code
- Pools in your own garden often up to 100 m³ permit-free (§61 model code)
- Permit-free only without a habitable room, toilet, shower, fireplace or fixed heating
- Even a permit-free building must respect the development plan and setback distances
- In the "outer area" (outside built-up zones) almost any structure needs a permit
- Connection to sewage/electricity or permanent living triggers extra duties and permits
🔓 Exceptions
- Small tool/garden sheds below the state limit: no permit, but mind setbacks
- Above-ground pools up to the state/model-code limit without a permit
- Heritage, nature- or landscape-protection areas: separate consent despite being permit-free
⚠️ Penalties & fines
A permit-required build without a permit is an "illegal building": the building authority can order a stop-work, set a fine and in the extreme order demolition — the builder bears the cost. Fines follow the state building code and can reach the high four- to five-figure range. Even a permit-free build that breaches setbacks can be ordered demolished.
📎 Official sources
- Model Building Code (MBO) §61 · permit-free projects →
- Gartenhaus.com · building permit garden house 2026 →
- Mein Eigenheim · building permit for the pool →
❓ Frequently asked
How big can a garden house be without a permit?
It depends on the state: often between 30 and 75 m³ gross volume. Examples: Bavaria up to 75 m³, Baden-Württemberg 40 m³, NRW 30 m³. The state building code always governs — when in doubt, ask the local building authority.
Do I need a building permit for a pool?
For typical garden and above-ground pools usually not: basins up to 100 m³ in your own garden are often permit-free (§61 model code). Larger basins, pools in the outer area or with a roof can be permit-required.
When does a garden house need a permit?
As soon as it has a habitable room, a toilet, a shower, a fireplace or fixed heating — or is used for living/sleeping. Then it almost always needs a permit, regardless of size.
Do I have to keep a distance from the neighbour?
Yes. Even a permit-free garden house must respect the setback distances of the state building code and the development plan. Breach them and the neighbour or authority can demand demolition.
What happens with an illegal building?
The authority can order a stop-work, set a fine and order demolition. Fines reach the high four- to five-figure range depending on the state. A retroactive permit is only possible if the build is substantively lawful.
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