Garden Room Planning Permission in Surrey & Hampshire

The simple permitted-development rules

Most garden rooms in Surrey and Hampshire fall under permitted development if: the structure is single-storey, the eaves don't exceed 2.5m, the overall height is 2.5m within 2m of any boundary (or 4m for a dual-pitch roof elsewhere), and it covers no more than 50% of the land around the original house.

If your build hits all four, you almost certainly don't need planning permission. If it misses one, you don't necessarily need permission - you may need a Lawful Development Certificate, which is the cheap, sensible way to lock in that permitted-development status before you build.

Where it gets complicated

Conservation areas - large parts of Farnham, central Guildford and Onslow Village - lose some permitted development rights, and Article 4 directions can remove more. If you're inside one, ask the council before designing the room, not after.

Listed buildings need listed-building consent for anything in the curtilage. Properties subject to a tree preservation order (TPO) - common around Camberley, Heatherside and Hawley - need separate works-to-trees consent if a root zone is touched.

Using the room as an office vs living space

Using a garden room as an office, gym, studio or hobby space is incidental to your home and stays inside permitted development. Sleeping in it changes the use class - which is when you'll usually need planning and building regs.

We get this question weekly from Fleet and Woking commuters who want a guest annexe. The honest path is: build the office under PD, get a Lawful Development Certificate, and treat the occasional overnight as occasional. Anything closer to permanent residential use needs the full planning route.

Building regulations

Building regs and planning are separate. Most garden rooms under 30m² don't need building control sign-off if they're more than 1m from any boundary and built from substantially non-combustible materials. Under 15m² is exempt regardless. We design every build to clear those thresholds where the site allows.

Our standard process

On the first site visit we walk the boundaries, check your conservation status, measure to existing structures and confirm whether you need permission, a certificate, or neither. If you do need anything, we'll point you at a local planning consultant who handles that paperwork well - we don't sell consultancy, we just build.