Obtain approval for a loft conversion
Building permit for the expansion or conversion of an attic into living space.
How to proceed
- 1
Have the project reviewed for compliance with building codes
Check the zoning plan and floor area ratio; if necessary, submit a preliminary inquiry to the building department.
- 2
Submit a building permit application with plans and structural calculations
Floor plans, cross-sections, elevations, and structural analysis are required.
- 3
Obtain a building permit and begin construction
Comply with the thermal and sound insulation requirements of the EnEV / GEG.
Required documents
- Structural analysisMandatoryOften forgotten
Verification of the roof truss's load-bearing capacity by a structural engineer.
Responsible authority
The authority of your main place of residence is responsible.Find authority →
Fees
Varies by case
Processing time
approx. 1 months
Official: max. approx. 1 months
Online application
In person or by post
Common mistakes
- • Renovation work has begun without structural analysis
- • Retroactive thermal insulation certification is missing
Common reasons for rejection
- • The zoning plan does not allow for an increase in the floor area ratio
- • is precluded by historic preservation regulations
You can usually file an objection against a rejection.
The essentials before applying
Who is eligible?
Homeowners who want to convert their attic into living or utility space.
Income limit
The limit varies by household and region – see the table at the responsible authority or in the application assistant.
Processing time
Nationwide: approx. approx. 1 months
Success rate
approx. 80.0 % (estimate)
Most common mistakes
- •Renovation work has begun without structural analysis
- •Retroactive thermal insulation certification is missing
Common reasons for rejection
- •The zoning plan does not allow for an increase in the floor area ratio
- •is precluded by historic preservation regulations
Alternatives
- Check related services in the application assistant
- Use social counselling before applying
If rejected
File a written objection within 30 days – with reasons why the decision is wrong and any missing evidence.