Building law & permits 2026

Building permit in Germany: process, costs and special cases

No build starts without a building permit (Baugenehmigung) — yet not every project needs one. We explain how the procedure works in 2026, what it costs and how long it takes, which projects are permit-free depending on the federal state (Bundesland), and what applies to tiny houses, conservatories and garages.

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The building permit procedure: step by step

It all starts with a complete design. You then submit the building application (Bauantrag) — usually through a licensed architect or your prefab manufacturer — to the responsible local building authority (untere Baubehörde). The application documents include the official site plan, the construction drawings with floor plans, sections and elevations, the building description, the structural stability proof (Statik) and the proof of the energy standard. The authority checks whether your project complies with the local development plan (Bebauungsplan) and the public building law set out in the German Building Code (Baugesetzbuch, BauGB).

Depending on the federal state and the project, either the simplified or the standard permit procedure applies. Affected neighbours and specialist offices are involved where necessary. If everything is met, the authority issues the building permit — only then may you begin construction. Because the interests of neighbours also play a role, it is worth reading our guide on neighbour law when building beforehand.

Building permit 2026: costs and processing time

Around 0.5% of the build cost

As a permit fee, a single-family house usually incurs €1,500 – €3,000.

Between 2 and 6 months

That is how long processing takes — depending on the procedure, authority and documents.

Before construction begins

As long as no permit has been issued, construction may not start.

Figures are guide values for 2026 and provided without guarantee. The relevant state building code (Landesbauordnung) and the local fee schedule remain decisive for fees and deadlines.

Permit-free projects: governed by the federal states

It is not the federal government but the respective state building code (Landesbauordnung) that defines what is permit-free — and the limits differ noticeably from one federal state to another. A nationwide model building code that serves as the basis for the state rules is drawn up by the Building Ministers' Conference (Bauministerkonferenz). Often permit-free are smaller ancillary structures up to certain size or volume limits, such as garden sheds, tool sheds, carports, patio roofs or fences. The permitted enclosed volume typically ranges from around 20 to 75 cubic metres depending on the federal state — a figure you should always check for your specific state.

Note: "permit-free" by no means implies "rule-free". Even without a building application, the development plan, the prescribed distances to neighbouring boundaries and all other building-law requirements must be observed. Misjudge this and you can quickly end up building unlawfully — a quick query to the building supervisory authority before starting work is therefore always the safer choice.

Special cases: tiny house, conservatory and garage

The tiny house

As soon as a tiny house is permanently placed and lived in, it counts as a building and — even with wheels — usually requires a permit. The location and permanent residential use are decisive.

The conservatory

Small, unheated patio roofs are often permit-free. As soon as a heated conservatory integrated into the living space enlarges the living area, it almost always requires a permit.

Garage and carport

Up to certain area and height limits, garages and carports are often permit-free depending on the federal state — yet boundary distances and the development plan still apply.

For the tiny house and the building-law requirements at the location, it is worth reading our guide on the tiny-house pitch and building law. If you are budgeting for a garage, you will find details under prefab garage & carport.

Building without a permit (Schwarzbau): why it never pays off

Anyone who builds without the required permit takes on considerable risk. The building supervisory authority can issue an immediate stop-work notice, impose steep fines and, in extreme cases, order demolition at your expense. An unpermitted building can often only be legalised afterwards with great effort — and sometimes not at all, if it contradicts the development plan.

On top of that come practical obstacles: an illegal build hampers or blocks the financing and the later sale of the property, because banks and buyers require a proper permit. In the end, the regular permit procedure almost always turns out to be the cheaper and safer option. With a prefab house, the manufacturer generally handles the building application documents anyway — one more reason to go through the procedure correctly. You can read what to watch out for with a prefab building application in our guide building permit for a prefab house.

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Frequently asked questions about the building permit

Answers on the procedure, costs, duration, permit-free projects and special cases — concise and up to date for 2026.

How does the building permit (Baugenehmigung) process work?

Once the design is finished, you submit the building application (Bauantrag) — usually through a licensed architect or your prefab manufacturer — to the responsible local building authority (untere Baubehörde). The documents include a site plan, construction drawings, a building description, structural calculations and proof of the energy standard. The authority checks whether your project complies with the local development plan (Bebauungsplan) and public building law, involves neighbours and specialist offices where necessary, and finally issues the building permit. Only then may construction start.

How long does a building permit take in 2026?

Processing time depends heavily on the federal state (Bundesland), the authority and how complete your documents are. In the simplified permit procedure for single-family houses you should generally expect around two to four months in 2026, and four to six months or longer in the standard procedure. Complete, review-ready documents and a matching development plan speed things up considerably; missing proofs and objections from neighbours can cause significant delays.

How much does a building permit cost?

The fees for a building permit are based on the construction value and in 2026 usually amount to around 0.5 percent of the build cost — so roughly between €1,500 and €3,000 for a single-family house. On top of that come the costs for the application documents, such as surveying, structural engineering, the energy certificate and preparing the paperwork. With a prefab house, the planning work for the building application is often already included in the offer.

When do I not need a building permit?

Whether a project is exempt from a permit is governed by the state building codes (Landesbauordnungen) — and these differ noticeably from one federal state to another. Small ancillary structures such as garden sheds, carports or patio roofs are often permit-free up to certain size and volume limits. But permit-free does not mean rule-free: even without an application, the development plan, the required distances to boundaries and neighbour-law requirements must still be observed. When in doubt, ask your local building supervisory authority.

Does a conservatory (Wintergarten) need a building permit?

That depends on the size, the construction type and the federal state. Small, unheated patio roofs are permit-free in many places up to a certain area. A heated conservatory that is integrated into the living space, however, almost always counts as a permit-required extension of the living area and requires a building application. Because the thresholds vary by state building code, you should always clarify the specific requirements of your municipality before starting work.

Does a tiny house need a building permit?

As soon as a tiny house is permanently placed at a fixed location and lived in, it counts as a building under construction law and generally requires a building permit — regardless of whether it has wheels. What matters is the location within the development plan and permanent residential use. Only simply parking it on a designated camping or special-purpose pitch may be treated differently. Our guide on pitch and building law explains the details.

What are the consequences of building without a permit (Schwarzbau)?

Anyone who builds without the required permit takes on considerable risk: the authority can order an immediate stop-work notice, impose fines and, in the worst case, order demolition at your expense. An unpermitted building can often only be legalised afterwards with great effort — and sometimes not at all — and can block the sale and financing of the property. Building illegally is therefore almost always more expensive than the proper procedure.

As of 2026, without guarantee. Building law is a matter for the federal states — procedures, deadlines, fees and permit-free limits follow from the respective state building code (Landesbauordnung) and the local statute. Prefabricated House is an independent comparison portal and is no substitute for individual, legally binding building advice from the responsible authority.