How much does a garden room cost in the UK?
A garden room costs £8,000 to £30,000 in the UK, typically around £16,000 installed. Prices reviewed June 2026.
A garden room is priced by size and by how fully it is finished, especially insulation and whether it has power, heating and plumbing.
Price your garden room
Adjust for your job and area to get a range. Nothing is sent anywhere.
Garden room cost breakdown
What a garden room typically costs, by the unit:
| What | Typical UK cost |
|---|---|
| Per m², supplied and fitted | £900 to £1,900 per m² |
| + Add a toilet / plumbing | add £2,500 to £5,000 |
| Typical 12 m² | £10,800 to £22,800 |
What's included in the price?
A typical garden room price includes:
- Insulated structure, cladding and roof
- Base or foundations
- Doors, windows and basic electrics
- Delivery and installation
What changes the price?
The things that move a garden room price most:
Floor area and ceiling height
Insulation and whether it is for year-round use
Power, heating, broadband and any plumbing
Groundworks and access to the garden
Does where you live change the cost?
Less location-sensitive than wet trades, but London and the South East still add around 10 to 20 percent.
Common questions
Most garden rooms are permitted development if they are single storey, under 2.5 metres high near a boundary, and not used as a separate dwelling. Conservation areas and listed buildings have tighter rules.
A fully insulated, powered garden office of around 3 by 4 metres typically costs £12,000 to £20,000 installed.
These are independent guide prices based on typical UK jobs in 2026. Your actual cost depends on your property, spec, access and where you live. Always get at least three written quotes before committing.