Not always. Single-storey rear extensions of up to 6m (semi-detached and terraced) or 8m (detached) can often be built under Permitted Development via the prior approval process. Side extensions, two-storey extensions and anything beyond these limits usually need full planning permission. We have a more in depth article on planning permission here.
We manage the whole process on your behalf, including drawings and submissions. And a word of caution: since April 2024, unauthorised building work can face enforcement action for up to 10 years, so it’s never worth skipping the proper route.
