How to Turn a Shed into a Garden Office
Convert a garden shed into a comfortable, year-round home office. The full process: choosing a suitable shed, insulation, power, lining, heating and the rules you need to know.
A garden office is the best commute you will ever have. Converting a shed into one is a genuinely achievable project: the difference between a draughty shed and a room you can work in all year is insulation, power, and a weekend or two of methodical work. This guide walks the whole route, in the order that avoids doing anything twice.
Structure → power → insulation → lining → finishes. Every conversion that goes wrong goes wrong by lining walls before the electrician arrives, or insulating a shed that leaks.
Is Your Shed Suitable? (And What to Buy If Not)
Not every shed earns an office conversion. Check these before committing money:
- Structure: framing of at least 44x44mm (ideally 47x70mm+), sound cladding, no rot in the floor or bearers. Push hard on the walls; meaningful flex means the lining will crack.
- Height: you want 2m+ of internal headroom after insulating the floor and roof. Low pent sheds can end up oppressive.
- Weathertightness: fix the roof covering and any leaks first. Insulating a damp shed just hides the rot while it spreads. Our roofing felt guide covers a re-felt.
- Base: a shed that rocks or sits on soft ground needs the foundation sorted before anything else.
- Windows: an office needs natural light. One decent window minimum, ideally facing away from your screen.
If the survey fails, or you are starting from scratch, you have two good routes: design a purpose-built office shed with proper framing in our shed builder (there is a garden office preset), or buy a thick-walled log cabin that is insulated by its construction and skips half of this guide.
Rules and Permissions: The Five-Minute Check
Most shed-to-office conversions are fine without any paperwork, but check these three things, in this order:
- Planning permission: a garden building used as a home office is usually permitted development if it meets the outbuilding limits (single storey, max 2.5m within 2m of a boundary, under half the garden). Using it for business visits or employees muddies this. Full detail in our planning permission guide.
- Building regulations: a detached garden office under 15m² with no sleeping accommodation is normally exempt. Between 15m² and 30m² it should generally be 1m from boundaries or built of substantially non-combustible material.
- The electrics are never exempt: outdoor mains work is notifiable under Part P. Use a registered electrician who self-certifies, and keep the certificate for resale.
Power First, Always
Get the electrician in before you insulate or line anything, so cables run neatly through the framing rather than being surface-clipped over your finished walls. A typical garden office supply is armoured (SWA) cable from the house consumer unit, buried or clipped along a fence line, into a small garage-style consumer unit in the office. From there: a ring or radial for sockets, a lighting circuit, and ideally a spare way for future heating.
Plan the socket positions around a desk you have actually measured. Four double sockets is a sensible minimum for a one-person office once you count monitors, laptop, lamp, heater, router and chargers. Our shed electrics guide explains the full setup and what the electrician will need from you.
Insulation: Where the Comfort Comes From
Rigid PIR boards (Celotex/Kingspan type) are the right tool for a shed office: the best insulation per centimetre, easy to cut with a fine saw, and they do not slump. The method for every surface is the same, and our full insulation guide covers it step by step:
- Walls: 50mm PIR between the studs, leaving a 25mm air gap between insulation and the outer cladding so the timber can dry. Tape all joints with foil tape.
- Roof: heat leaves upwards; use at least as much as the walls (50mm if the rafters allow, never less than 25mm) plus the same air gap under the roof deck.
- Floor: 25mm+ PIR over the existing boards with a floating chipboard or ply deck on top, or between the joists if you can get underneath.
- Vapour control: a polythene VCL (or well-taped foil facings) on the warm side stops moist indoor air condensing inside the walls. Skipping this is how conversions grow mould.
An insulated office still needs ventilation: trickle vents, an openable window, or a small humidity-controlled extractor. Airtight plus warm plus a human equals condensation. See our condensation guide.
Lining and Finishing
Over the insulation and VCL, line the walls with 9–12mm plywood or OSB (screw-friendly for shelves anywhere) or plasterboard for the crispest painted finish. Fill fixings, caulk the corners and paint; a bright white or warm off-white does wonders for perceived space and video-call light.
- Floor: laminate or LVT over the insulated deck is durable and office-chair-proof. Add a rug for warmth.
- Draughts: compression strip around the door, brush strip at the threshold, and sealant where cladding meets frame. Draughts undo insulation embarrassingly fast.
- Trims: skirting and window trims hide the lining edges and make it read as a room, not a lined shed.
Heating, Cooling and Internet
A properly insulated 8x6 to 10x8 office needs surprisingly little heat: a 500W–1kW panel heater or oil-filled radiator on a thermostat covers UK winters, and a £20 smart plug lets you warm it up from the kitchen before you walk down. For summer, a window you can open plus a blind on the sunny side beats a noisy fan; if you glazed generously, consider reflective film.
For internet, in order of preference: an outdoor-rated Ethernet cable in the same trench as the power (fastest, most reliable), a wireless point-to-point bridge on the office wall, or a mesh node if the office is close to the house. Test video calls at your actual desk position before declaring victory.
What It Costs
Typical all-in conversion costs for an existing sound 8x6 to 10x8 shed, doing the non-electrical work yourself:
| Item | Typical cost |
|---|---|
| Electrician: supply, consumer unit, sockets, lights | £500–£1,200 |
| PIR insulation (floor, walls, roof) | £250–£500 |
| Lining boards, fixings, sealant, paint | £200–£400 |
| Flooring | £100–£250 |
| Heater, draught-proofing, sundries | £80–£200 |
| Total | £1,100–£2,500 |
Compare that with £8,000–£25,000 for a turnkey garden office pod and the appeal is obvious. The middle route, a thick-walled log cabin you fit out yourself, lands between the two and skips the insulation stage entirely.
Summary
- Convert only a sound, dry, level shed; fix structure and roof first
- Electrician before insulation, insulation before lining
- 50mm PIR walls, roof to match, VCL on the warm side, and deliberate ventilation
- Ply or plasterboard lining, draught-proofing and a small thermostat heater finish the job
- Budget £1,100–£2,500 on an existing shed, a fraction of a turnkey pod
Design Your Office Shed
Starting from scratch? Use the garden office preset in our free builder to get a full materials list, cutting plan and cost for a purpose-built office shed.
Design a Garden Office