When do you need a roof extension permit?

When is a roof extension permit needed?

A roof extension hardly ever counts as permit-free building. The national rules for that focus mainly on ground-floor structures in the rear yard area, whereas a roof extension changes the height and silhouette of the house. The municipality therefore assesses the plan against the environment plan and the rules on appearance.

A dormer on the rear roof slope can be permit-free under certain conditions. If you are torn between the two, read dormer or roof extension.

What does the municipality assess a roof extension against?

The municipality checks whether the roof extension fits within the environment plan, for example the maximum building height. It also assesses the plan against the rules on the appearance of buildings, formerly known as welstand. Many municipalities have a preferred model for terraces of houses, so that roof extensions in a street match each other.

The plan also has to be technically sound. A structural engineer demonstrates that the existing walls and foundations can carry the extra weight.

• Maximum building and eaves height in the environment plan
• Appearance, materials and fit with the street
• Any roof extension policy for your type of house
• Structural justification for the existing house
• Extra rules for listed buildings and protected townscapes

How does the roof extension permit application work?

It starts with a drawing and a description of the plan. Many municipalities let you request a preliminary consultation first. That takes some time, but you hear early on whether the plan stands a chance. You then submit the application via the Omgevingsloket, with drawings, a structural justification and any other documents the municipality asks for.

Under the regular procedure, the municipality in principle decides within eight weeks, extendable once by six weeks. After that, interested parties such as neighbours have six weeks to object. Anyone who starts immediately after the permit is granted does so at their own risk.

• Preliminary consultation with the municipality, if possible
• Drawings, structural justification and description
• Submitting the application via the Omgevingsloket
• Decision within eight weeks, extendable once by six weeks
• Then a six-week objection period for interested parties

How do you avoid delays with your permit?

A complete application is the fastest. If documents are missing, the municipality requests them and the clock is pushed back. A roof extension is therefore rarely decided overnight: allow a few months for design, structural engineering work and the permit.

If you wish, Bouwbedrijf R. Vlieland provides the complete package, from drawings and permits to construction, with one dedicated project manager. That way design and building fit together. Read more about a roof extension with a roof terrace, about the costs of a roof extension and about a permit for a renovation in general.

Frequently asked questions