Insulated timber-frame garden offices for Barnet and Hertfordshire homes — fully wired, sound-insulated, building-regs-compliant where required. The work-from-home upgrade that adds real value.
Why a Garden Office
Working from home full-time stresses the housing layout that worked perfectly well when it was an occasional Wednesday. Spare bedrooms get colonised, kitchen tables get colonised, dining rooms get colonised. A garden office moves work out of the house — physically and psychologically — and often pays back in property value too.
Construction
The carpenters we connect you with build timber-framed offices on a concrete or insulated raft foundation. Walls are typically 70mm or 100mm timber stud, insulated with PIR board (Celotex/Kingspan) and clad externally in larch, cedar or composite board. Internally — plasterboard skim, painted, with hardwood or LVT flooring.
Electrics: armoured cable run from the house consumer unit, separate sub-board in the office, sockets, lighting and data point. EV charge points can be added if the run supports it.
Heating: typically a low-output electric panel or air-to-air heat pump — small office, well insulated, doesn't need much.
Permitted Development & Planning
Most garden offices fall under permitted development — single-storey, under 2.5m at the eaves, more than 2m from any boundary, and the total outbuilding footprint under 50% of the garden. Conservation areas (parts of EN5, EN6, parts of N20) restrict this further. The carpenter will assess on the survey and either confirm PD or flag a planning application early.
Buildings under 30m² that aren't for sleeping accommodation are typically exempt from Building Regs sign-off — but electrical work must be Part P certified by an electrician with NICEIC or equivalent registration.
Cost Range
- Small office (3m × 3m, insulated, wired): £14,000–£20,000
- Medium office (4m × 3m, with separate WC): £22,000–£32,000
- Large studio (5m × 4m, kitchenette, WC, AC): £35,000–£55,000+
Foundation, drainage, electrical sub-supply and external landscaping are usually included. Furniture and built-in storage are typically separate.
Frequently Asked Questions
Do I need planning permission for a garden office?
Usually no — most installs fall under permitted development. Conservation areas, listed buildings and very large outbuildings need planning. The carpenter assesses this on the survey before quoting.
How long does a garden office build take?
Foundation: 1 week. Frame, weathertight: 1–2 weeks. Internal fit-out (insulation, plaster, electrics, decoration): 2–3 weeks. Total: typically 4–6 weeks from start to handover.
Can it include a bathroom?
Yes — adds £4,000–£7,000 for the WC, drainage connection to the house run, and tiling. Larger studios sometimes include a small shower.
Will it add value to my house?
A well-built, insulated garden office typically adds 5–10% to property value in Barnet and Hertsmere — and significantly more in lettings (separate workspace is a strong selling point).