Estimated Cost of Building a 10m² Garden Office – UK (2025)
- Mariusz Mika
- Jul 21
- 1 min read
Build Standard | Cost per m² | Total for 10 m² | Description |
Basic DIY | £800 – £1,000 | £8,000 – £10,000 | Budget materials (OSB, membrane), minimal or no insulation |
Mid-range (standard) | £1,200 – £1,800 | £12,000 – £18,000 | Insulation, electrics, windows, flooring, EPDM or metal roof |
| £20,000 – £25,000 | Full insulation, plastered walls, aluminium doors/windows, heating, full finish |
✅ Typically Included:
Foundation (concrete slab or pad stones)
Timber or steel frame construction
Wall, floor, and roof insulation
Exterior cladding (e.g. cedar, composite, or treated timber)
Doors and windows (uPVC or aluminium)
Electrics (lights, sockets, fuse box – but not connection to the house)
Flooring and interior finish (e.g. plasterboard or cladding, paint)
❌ Not Typically Included:
Electrical connection from main house (may cost £500 – £2,000 depending on distance)
Internet connection
Heating or air conditioning (£500 – £1,500 depending on system)
Plumbing or toilet facilities (adds significant cost if needed) Estimated Cost of Building a 10m² Garden Office – UK
