Turning premises into a place of worship: the change of use
Taking over existing premises, a former shop, a warehouse or an office, is often quicker and cheaper than building. But assigning those premises to worship is not done freely: it is a change of use in planning terms, which follows precise rules. Here is how it works.
The Great Mosque of Kairouan, raised from 670, is one of the oldest in the Muslim world and served as an architectural model for centuries. Adapting a place to worship is part of a long history of builders.
What a change of use is
In planning, every construction has a « use », that is a recognised purpose. The planning code distinguishes five broad uses, themselves split into sub-uses (article R.151-28). A shop, a warehouse or an office fall under uses different from that of a place of worship. Moving from one to the other is therefore a change of use, subject to authorisation.
The « places of worship » sub-category
Since 1 July 2023, following the decree and order of 22 March 2023, places of worship form a sub-category in their own right, attached to the use « facilities of collective interest and public services » (article R.151-28). Previously, they were placed among the « other public-access facilities ». The stated aim of this reform was to let towns better control, in their local plan, the siting of places of worship.
Building permit or prior declaration?
Once the zone is checked, the authorisation depends on the works. The rule reads in two steps.
| Situation | Authorisation | Reference |
|---|---|---|
| Change of use without touching the load-bearing structures or the facade | Prior declaration | art. R.421-17 |
| Change of use with works altering the load-bearing structures or the facade | Building permit | art. R.421-14 |
In other words, any change of use is at least subject to a prior declaration. As soon as the work touches the structural shell or the outward appearance, it switches to the building permit. Since bringing a public-access building up to standard often involves this kind of work, the permit is frequent in practice.
The obligations that follow the assignment to worship
Assigning premises to worship makes them enter the category of type V public-access buildings. This triggers the fire-safety and accessibility rules, checked by the safety commission before opening to the public. Moreover, since the project holder is an association, that is a legal entity, the use of an architect is required to file the building permit, whatever the floor area.
To know precisely which category of building your project belongs to and which planning route applies, the siting assessment does this work from your town and your premises.
The frequent pitfalls
- Signing a lease or buying premises before checking that the local plan allows a place of worship there.
- Believing that a mere de facto use is enough: assigning premises to worship is a change of use subject to authorisation.
- Filing a mere prior declaration when the works touch the facade or the load-bearing structures.
- Forgetting to factor in from the start the constraints of the type V building and the architect requirement.
Frequently asked questions
Can commercial premises be turned into a mosque?
Often yes, but on two conditions. First, the local plan must allow a place of worship in the zone where the premises are. Then, the appropriate planning authorisation must be obtained, because going from a shop to a place of worship is a change of use within the meaning of the planning code.
Is a building permit or a prior declaration needed?
Any change of use is at least subject to a prior declaration (article R.421-17 of the planning code). A building permit becomes required as soon as the works alter the load-bearing structures or the facade of the building (article R.421-14). Since a mosque is a public-access building, works to bring it up to standard are frequent, which often points toward the permit.
What is the « places of worship » sub-category?
It is a category of the planning code, created by the decree and order of 22 March 2023 and in force since 1 July 2023, attached to the use « facilities of collective interest and public services » (article R.151-28). It lets towns decide, in their local plan, where a place of worship may settle.
How do I know whether my town allows a place of worship at that spot?
You have to consult the local plan rules for the zone concerned, which set out the uses and sub-uses allowed, allowed under conditions or forbidden. The document can be viewed at the town hall and, in many towns, on the Géoportail de l'urbanisme.
Does a change of use trigger other obligations?
Yes. Once assigned to worship, the premises become a type V public-access building, subject to the fire-safety and accessibility rules, with an opinion from the safety commission before opening. And since the holder is an association, that is a legal entity, the use of an architect is required for the building permit.
To go further
This guide complements our overview page, Building a mosque in France. To site your project precisely, run the assessment.