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Do you need planning permission for a treehouse?

The Treehouse Guide Planning and Regulations

Planning is one of the first things to think about when considering a treehouse in the UK, and it is where a lot of online advice goes wrong.

By Henry Durham. Updated October 2026.

The 30cm rule

There are restrictive planning rules in the UK regarding raised platforms. Any platform that is more than 30cm above ground level will require planning permission, which means that every treehouse, regardless of its size, should have planning permission.

You will sometimes read that this is a myth or an oversimplification. It is not. The 30cm figure comes from the government’s own guidance on permitted development, which treats any platform above that height as a raised platform and excludes raised platforms from the permitted development rules for garden buildings.

What the planners will look at

Treehouses raise particular questions about overlooking, privacy and their visual impact on neighbouring properties, simply because they sit higher than a normal garden building. The size, height and position of the structure, and its relationship to the house and the boundary, all come into it.

For that reason we recommend dealing with planning at the very beginning of a project, rather than designing the whole treehouse first and asking about planning afterwards. Knowing the constraints early means the design can work with them.

Questions people ask

Yes. A platform higher than 30cm above ground is classed as a raised platform under the permitted development rules, and raised platforms are not permitted development. In practice that means a treehouse needs planning permission.

If the platform is more than 30cm off the ground, yes. The rule is about height above ground, not about the size of the treehouse or who uses it.

At the start. We would rather know the constraints before we design than redesign afterwards.

More from the guide

Cost and Budget

How much does a bespoke treehouse cost?

This is usually the first question we are asked, and the honest answer is that it depends on the treehouse you want to create. Our bespoke treehouses start from around £15,000. The final cost can vary a great deal depending on the size, the design, the trees, the access and the level of specification.

Trees

Which trees are best for a treehouse?

There is no single species that suits every treehouse. The health, size, structure and position of the individual tree usually matter more than what kind of tree it is. Two oaks standing fifty metres apart can have completely different characteristics. That said, after twenty years we have clear views on the trees we meet most often.

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