Answer

Does an attached pergola need planning permission?

Possibly. Attached to the house it can count as an extension rather than an outbuilding.

In short

It can. A freestanding pergola is treated as an outbuilding and is permitted development within the height limits, but once a pergola is fixed to the house it can count as an extension, which is assessed differently. A raised platform above 0.3 metres also falls outside permitted development. On designated land the rules are tighter, so confirm before building.

A note

General guidance, not advice. Rules vary by site, and Article 4 directions or conditions can change what applies. Check with your local authority and the Planning Portal.

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