A terrace roof is permit-free (verfahrensfrei) in most federal states as long as it does not exceed a certain area and depth. Typical limits are up to 30 mĀ² of area and around 3 m of depth, with some states deviating. In that case you need no building application. You still have to comply with setback areas, the development plan, and local by-laws.
When is a terrace roof permit-free?
Every state building code contains a list of projects that may be built without a permit procedure. Terrace roofs are on that list almost everywhere, but with two conditions: the area must not exceed an upper limit, and often the depth is capped as well, meaning how far the roof extends from the house wall into the garden.
The location also matters: the exemption usually only applies in the inner area (Innenbereich). In the outer area (AuĆenbereich) you practically always need a permit.
Which sizes apply in the federal states?
Many states follow the model building code with 30 mĀ² of area and 3 m of depth. Some deviate. As a rough guide, as of 07/2026:
| Federal state | Permit-free up to |
|---|---|
| Bavaria | 30 mĀ² area, no depth limit anymore |
| North Rhine-Westphalia | 30 mĀ² area and 4.5 m depth |
| Most other states | 30 mĀ² area and 3 m depth |
Bavaria scrapped its former 3 m depth limit on 1 January 2025. Since then only the area counts there. NRW allows particularly deep roofs with 4.5 m. The exact figures are in your state building code, and they can change.
Setback areas: the most underestimated point
This is where most mistakes happen. A terrace roof is not a garage and not a carport. For garages, many states allow building directly on the plot boundary under conditions. That privilege usually does not apply to terrace roofs.
In practice this means: your roof has to keep the normal boundary distance, usually 3 m to the neighbouring plot. If your terrace sits right at the boundary, you often cannot simply roof it completely. Possible ways out are a narrower roof, a deviation approved by the building authority, or written neighbour consent, depending on what your state provides for.
So check the boundary distance before you order, not during assembly.
Development plan and local by-laws
Even a permit-free roof has to fit the development plan (Bebauungsplan). Most relevant are:
- Building limits and building lines: if the roof extends beyond the building limit, it can be inadmissible even though the size fits.
- Rules on the buildable plot area and the plot coverage ratio.
- Design by-laws that prescribe material or roof shape.
Permit-free only means that nobody checks in advance. The responsibility that everything is lawful lies with you. In case of a violation, the building authority can also intervene afterwards.
Side walls and glazing change the assessment
The permit exemption applies to the roofing, meaning the roof over the terrace. As soon as you close the sides or glaze it all around, in building-law terms you quickly create a conservatory or an extension. Different and stricter rules apply to those, often with a permit requirement, structural requirements, and depending on the design also energy-efficiency requirements.
So plan honestly: if you want an enclosed room in the long run, clarify the requirements for a conservatory right away instead of closing the roof bit by bit later.
Checklist before buying
- Clarify the federal state and the applicable state building code.
- Measure the area and depth of the planned roof.
- Determine whether the plot is in the inner or outer area.
- Measure the distance to the neighbouring boundary, if in doubt with a site plan or survey.
- Check the development plan for building limits and design rules.
- Check the municipality's local by-laws.
- Clarify whether side walls or glazing are planned later.
- When building close to the boundary, talk to the neighbour and record the consent in writing.
If you can answer all points cleanly, the risk of a nasty surprise is small. If one point stays open, clarify it with the building authority before ordering.
Frequently asked questions
Do I need my neighbour's consent? Not in general. If you keep the setback areas, no consent is needed. If you want to build closer to the boundary, the route runs via neighbour consent or a deviation at the building authority, depending on the state. A short conversation beforehand is almost always worth it.
Does the terrace itself count too? The ground-level terrace is usually unproblematic. It becomes relevant in building law through the roof, because that creates a structure with height and setback impact.
What happens if I built too large? The building authority can demand a retroactive permit or order demolition if the project cannot be approved. Legalising afterwards is more expensive and less certain than checking beforehand.
Conclusion
The good news: a typical terrace roof up to 30 mĀ² is possible without a building application in most federal states. The risks are in the details, above all the boundary distance, building limits in the development plan, and the depth in states with a depth cap. If you clarify these three points before buying, you can build relaxed.
Check your project in a few minutes with BauErlaubt and find out which limits apply in your federal state: Start the free pre-check.
This article is for general information only. It does not replace legal advice or a binding statement from the competent building authority.