Do you need planning permission for a garden room?

The short answer

A garden room is usually allowed under permitted development, the national rules that let you build some things without applying for planning permission. It has to be single storey, used for something incidental to the house (an office, gym, studio or hobby room), and within set height and size limits.

If your plans fall outside those limits, or your home is in a protected area, you'll need to apply. That doesn't mean the answer is no, only that the council needs to look at it first.

Height limits

The eaves can be no higher than 2.5 metres. The whole building can be no taller than 2.5 metres if it's within 2 metres of a boundary. Further from the boundary it can go up to 3 metres, or 4 metres with a dual-pitched roof.

Height is measured from the ground next to the building. On the sloping gardens common around Keighley, Baildon and Otley, the downhill side can end up taller than you expect, so check this before you choose a design.

Size, position and use

Together with any other outbuildings, a garden room can't cover more than half the land around the house (not counting the house itself). It can't sit in front of the principal elevation, which is usually the front of the house, and it can't have a veranda, balcony or raised platform over 30 cm.

It can't be used as a bedroom or separate living space. A home office, gym, studio or playroom is fine. Sleeping accommodation needs full planning permission and building regulations approval.

Conservation areas, the national park and Saltaire

In conservation areas, the Yorkshire Dales National Park and the Saltaire World Heritage Site, a garden room at the side of the house needs planning permission. In the national park and the World Heritage Site, outbuildings more than 20 metres from the house are also limited to 10 square metres in total.

There are conservation areas in and around every town we cover, including Haworth, Oakworth and Silsden near Keighley, Saltaire in Shipley, Ilkley, Ben Rhydding and Burley-in-Wharfedale, and the centre of Otley. Listed buildings need listed building consent for work in their grounds too.

Some estates had permitted development rights removed by a planning condition, and councils can remove them in particular streets with an Article 4 direction. If your house is fairly new or in a sensitive street, check your planning history first.

Building regulations

Building regulations are separate from planning. A garden room nobody sleeps in is usually exempt if its floor area is under 15 square metres. Between 15 and 30 square metres it's exempt if it's at least 1 metre from every boundary or built mainly of non-combustible materials. Over 30 square metres needs approval.

Electrics are different. Running a new circuit out to a garden room is notifiable work, so a registered electrician should do it and certify it.

Which council to ask

Keighley, Bingley, Shipley, Saltaire, Baildon and Ilkley are in Bradford Council's area. Otley is Leeds City Council. Skipton and most of Craven are North Yorkshire Council, except homes inside the Yorkshire Dales National Park, where the National Park Authority handles planning.

If you want certainty before you build, you can apply to the council for a Lawful Development Certificate. It confirms in writing that your garden room counts as permitted development, which can also help when you come to sell.

This guide is general information, not legal advice. Rules can change; check with your council before you build. Updated September 2026.