Garden Room Size Guides
Pick your size and get the full DIY build guide
Each guide covers dimensions, use cases, furniture layouts, planning permission notes, build timeline, and key materials — everything you need to understand before committing to a size.
4×3m Garden Room
The Perfect Home Office
The 4×3m garden room is the UK's most popular size — big enough for a comfortable home office or hobby room, small enough to fit most gardens without planning permission.
5×3m Garden Room
Versatile Space for Work or Play
The 5×3m offers an extra metre of width over the 4×3m, making it ideal for dual-purpose rooms — a home office with a meeting area, or a hobby room with proper storage.
6×3m Garden Room
Serious Space for Serious Builds
The 6×3m is the go-to size for those who want a proper room at the bottom of their garden. Long and lean, it suits workshops, studios, and dual-function spaces.
6×4m Garden Room
Premium Garden Room for Ambitious Projects
At 24m², the 6×4m is a proper room that rivals many spare bedrooms. This size opens up possibilities for commercial use, large studios, or multi-function spaces.
Not sure which size to choose?
Here is a quick rule of thumb:
Ready to build your garden room?
Get the complete DIY build pack — full plans, materials list, and step-by-step guides for £49.