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Installation of outdoor annexes in its garden

Verified 13 juillet 2020 - Directorate for Legal and Administrative Information (Prime Minister)

To incorporate an annex into your garden, it is sometimes necessary to apply for an authorization. This depends first of all on the type of the annex. Is it a permanent installation (garden shed, pergola, ...), or a temporary installation (above ground pool, arbor, garden greenhouse, ...)? The characteristics and the surface of the annex shall then be taken into account.

Permanent Annex

These include the following annexes:

  • Garden shed (or garden shed)
  • Kiosk
  • Pergola
  • Lightweight structure of playground (portico, slide, swing, trampoline, ...)
  • Barbecue fixed (stone, brick)
  • Outdoor shower or toilet stall

  Please note : specific rules apply to caravan and mobile home..

General case

No action is necessary if the dimensions of your annex do not exceed:

  • 12 m high
  • and 5 m² (floor surface and ground right of way).

  FYI : you can install frame and production greenhouses without formality if their height does not exceed 1.80 meters.

If the dimensions of your annex exceed at least one of these thresholds, you must apply for planning permission. Depending on the size of your annex, this is a prior declaration of work or building permit..

Protected Area

In a protected area (near a heritage site or a historic monument, in a classified or pending site), you must apply for planning permission. Depending on the size of your annex, this is a prior declaration of work or building permit..

Provisional Annex

These include the following annexes:

General case

You can temporarily install a demountable structure without having to ask for permission, if it is installed 3 months maximum in the year.

If the installation time of your annex must exceed this time limit, you must apply for a planning authorization (according to the dimensions of your installation, prior declaration of work or building permit).

Protected Area

In a protected area (near a heritage site or a historic monument, in a classified or pending site), you can install a demountable annex without authorization, provided it is 15 days maximum per year.

If your schedule is to be installed for longer than this period, you must apply for planning permission. Depending on the size of your installation, this is a prior declaration of work or building permit..

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