Tree houses: do I need planning permission?

Children want one, and every so often a council serving an enforcement notice on a family’s tree house makes the local news. So where does a tree house sit in planning terms? A typical elevated tree house will usually fall outside the garden-outbuilding permitted development right because of the GPDO’s raised-platform restriction.

The permitted development right for sheds, garden offices and the like is Class E of Part 1 of the GPDO. Class E does not permit a veranda, balcony or raised platform, and “raised” in relation to a platform means more than 0.3 metres above ground level. Most true tree houses sit well above that threshold, so Class E will not normally help. An unusually low structure still has to satisfy every other Class E limit. In particular, it must be single storey: staying below the applicable height limit does not rescue a tree house with more than one storey.

Why a tree house falls outside Class E

Class E permits a building or enclosure required for a purpose incidental to the enjoyment of the house – sheds, greenhouses, playhouses and so on. But the right comes with limits and exclusions, and the decisive one for a tree house is the raised platform rule:

• Class E does not permit a veranda, balcony or raised platform, and a raised platform is defined as any platform more than 0.3 metres above ground level – a tree house is a raised platform many times that height, so the right does not apply
• the building must also be single storey. Even if it stays below the applicable overall-height limit, a tree house with more than one storey does not qualify under Class E
• and where any part is within 2 metres of a boundary, the total height must not exceed 2.5 metres – a structure up in the branches will usually breach this too

The raised platform point is the clean one: it does not depend on how big or how tall the tree house is, only that it sits above 0.3 metres – which most elevated tree houses do. This is the same rule that keeps garden decking within permitted development only while it stays under 0.3 metres. As our outbuildings guide notes, even a two-storey playhouse for the children needs planning permission – and a tree house has the same problem, with the added raised platform issue built in from the ground up.

Where a tree house falls outside Class E, the next question is whether the structure amounts to development at all. A substantial elevated structure normally will, in which case planning permission is required. A very small, low and lightweight structure may need a more fact-specific assessment.

Could a very small tree house fall outside planning control?

Scale, permanence and physical construction matter when deciding whether a structure amounts to development in the first place. A very small, low and genuinely lightweight play structure may need a fact-specific assessment rather than being assumed to require an application. That is separate from enforcement discretion: if a structure is development and has no planning permission, a council may still decide that formal enforcement would not be expedient, but that does not make the structure lawful or create a permitted development right.

The things that turn a harmless tree house into an enforcement risk are the usual ones: it is tall enough to look into a neighbour’s garden or windows, it is large or permanent, or it sits close to a boundary. Loss of privacy to neighbours is the single most common trigger for complaints, and once a complaint is made the council has to consider it.

Listed buildings, conservation areas and protected trees

Extra rules apply on designated land. Class E is not available for a building or structure within the curtilage of a listed building. On Article 2(3) land, which includes conservation areas, National Parks, National Landscapes and World Heritage Sites, Class E also excludes development between a side wall of the dwellinghouse and the curtilage boundary. National Parks, National Landscapes, the Broads and World Heritage Sites have the additional 20-metre / 10 m² cumulative restriction. Separately, if the tree itself is protected by a Tree Preservation Order or sits in a conservation area, fixing a structure to it or cutting branches to make room may require consent or notice – check the tree’s status before you build.

What it costs and how to apply

If you do need permission, this is a householder planning application. Application fees are set nationally but change from time to time and we do not quote a figure here – see our guide to planning application fees for the current position. A tree house is a small, cheap thing to apply for, and a refusal is not the end of the road.

If the council refuses – or has already acted

If your application is refused, you can appeal to the Planning Inspectorate. Householder appeals run to a tighter timetable than most, so do not sit on a refusal – our guide to planning appeals explains the deadlines and the process. If a council has already served an enforcement notice over a tree house, that is a different route again, with its own strict deadline to appeal the notice – see our guide to enforcement notices and how to appeal them.

Should you build one at all?

For a small, low tree house well away from boundaries, the honest answer is that many go up and are never questioned. The risk rises sharply with height and with anything that overlooks a neighbour. If yours is going to be tall, sizeable or close to the fence line, a short conversation with the council – or a householder application – is far cheaper than an enforcement notice and the fight that follows. When in doubt, ask before you build.

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Tree House Planning Permission Page Updated: 24th August 2026