The administrative revolution is underway. Since 2026, the “silence equals consent” principle applies to certain building permit applications in Luxembourg. No more endless waiting without response.
The Silence Equals Consent Principle
Before this reform, a building permit application without response from the administration remained pending indefinitely. You had to follow up, wait, and sometimes the file dragged on for months.
Under the principle now in force, if the administration doesn’t respond within a defined deadline, your application is automatically approved. The administration’s silence equals consent.
Projects Concerned
Silence equals consent doesn’t apply to all projects. Only certain categories are affected.
Light works such as window replacement with change of appearance, small extensions under 20m², and simple external landscaping are eligible.
Works in protected zones, major new constructions and projects requiring impact studies remain subject to the classic procedure with mandatory response.
For an overview of which authorisation your type of works requires, see our complete guide to building permits in Luxembourg.
Deadlines to Respect
The administration’s response deadline is set according to project type.
For light works, the deadline is 2 months. Without response from the municipality within this deadline, authorisation is deemed granted.
For larger projects still eligible for silence equals consent, the deadline may extend to 4 months.
Important: The deadline only runs from submission of a complete file. If documents are missing, the counter doesn’t start.
How to Prove Tacit Consent
In case of silence equals consent, you need to be able to prove that your application was indeed submitted and the deadline has expired.
The submission receipt with date is essential. Keep it carefully.
A tacit consent certificate can be requested from the municipality after the deadline expires.
This certificate is necessary for subsequent procedures, particularly with insurers and banks.
What Doesn’t Change
Certain rules remain unchanged despite this development.
The file must still comply with your municipality’s PAG (General Development Plan) urban planning rules. Tacit consent on a non-compliant project could be annulled.
Third party appeals remain possible. A neighbour can still contest a project, even if approved by silence.
Inspections during and after works are maintained. Tacit consent doesn’t exempt you from following the rules.
How to Benefit
If you have a works project, here’s our advice to take advantage of the rule.
Prepare a complete and compliant file from the start. An incomplete file delays the start of the deadline.
Verify your project’s compliance with your municipality’s PAG. A non-compliant project will be refused, even with silence equals consent.
Work with a professional for complex projects. An architect knows the rules and can make your file reliable.
Find a professional for your project →
FAQ
Is this rule already in force?
Yes, it has applied since 2026. Applications submitted before this date remain subject to the previous procedure.
Can my municipality refuse to apply this rule?
No, it’s a national rule that applies to all Luxembourg municipalities.
Does silence equal consent for demolition permits?
The precise terms are defined by grand-ducal regulation. Sensitive projects like demolitions may be excluded from the scheme. Check with your municipality for your specific case.
