Planning permission
“Do I need planning permission?”
It's the first question nearly everyone asks — and the honest answer is usually no. Most garden rooms fall under Permitted Development. Here are the rules that decide it, in plain English.
The usual answer
Most builds don't need permission — if they stay inside Permitted Development.
“Permitted Development” means the government has pre-approved certain small building works, so no formal application is needed — provided the build stays within set limits. Garden rooms almost always can. The key thresholds are below. (Listed buildings, Conservation Areas, Areas of Outstanding Natural Beauty and some flats have tighter rules — we'll flag it early if that's you.)
Height near a boundary
If any part of the building is within 2 metres of a boundary, its overall height must not exceed 2.5 metres. Set it further in and you have more headroom to play with.
Eaves and ridge height
Set further from boundaries, eaves must stay under 2.5 metres and the overall ridge under 3 metres for a flat or mono-pitch roof (4 metres for a dual-pitch). Our low-profile flat roofs are designed with this in mind.
Garden coverage
Outbuildings together shouldn’t cover more than half of the land around the original house. Most single garden rooms are comfortably within this.
Use and position
It must be for a purpose incidental to the house, single-storey, and not sit forward of the principal elevation facing a road.
How Vertex handles it
At the free site survey we check the boundaries and heights against these rules, and design your room to sit comfortably within Permitted Development wherever possible — that's usually the simplest path. If your plot or a Conservation Area means a formal application is the sensible route, we'll tell you straight, and point you to the right steps with your local authority. No surprises, no guesswork.
Guidance only — always confirm with your local planning authority for your specific property.
Not sure about your garden?
Send us a rough idea of where the room would go and how close it is to the boundary — we'll give you an honest read on the planning side before anything else.