Estimated Cost of Building a 10m² Garden Office – UK (2025)

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

Premium / Turnkey

£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)

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❌ 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

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