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. What moves the price most is floor area and ceiling height, so a simpler job sits near the bottom of that range and a larger or higher-spec one near the top. Prices reviewed June 2026.
A garden room, also called a garden studio, is priced by size and by how fully it is finished, especially insulation and whether it has power, heating and plumbing.
Garden room cost calculator
Use the calculator to price your garden room in 2026. Adjust the options and area for a UK cost range. Nothing is sent anywhere.
To price the whole job, use the garage conversion cost calculator.
Garden room cost breakdown
Typical garden room 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 |
| 6 m² | £5,400 to £11,400 |
| 12 m² (typical) | £10,800 to £22,800 |
| 24 m² | £21,600 to £45,600 |
What's included in the price?
Typical garden room prices include:
- Insulated structure, cladding and roof
- Base or foundations
- Doors, windows and basic electrics
- Delivery and installation
What changes the price?
The things that move garden room prices 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
How the price is built up
A garden room price is built up from the shell, then everything that makes it usable all year. The shell covers the base, timber frame, roof, cladding, doors and glazing, which is where most of the £8,000 to £30,000 range sits, and the whole job works out at roughly £900 to £1,900 per square metre installed, the rate the calculator uses. On top of the shell you pay for insulation to floor, walls and roof, plus power, lighting and heating, and any plumbing, which is why a small uninsulated unit can come in near £8,000 while a larger year-round room with a shower room reaches the upper end. On a typical £16,000 build, materials such as the frame, cladding, insulation and glazing usually account for a little over half the cost, with the rest going on labour for the foundations, build and fit out.
Ways to keep the cost down
- Keep the footprint to 15 square metres or less, with no sleeping accommodation, and the building itself is exempt from the building regulations, though Part P still covers its electrics and Part G any water piped from the house. Planning is a separate test: permitted development needs the eaves at 2.5 metres or lower, among other limits.
- Skip plumbing if you can. A sink and drainage run often adds around £2,000, so leaving it out keeps a year-round office or studio nearer the typical £16,000.
- Position the room closer to the house to shorten the armoured cable run. A 15 metre electrical supply is around £1,500, and longer runs under paths and patios cost more.
- Get itemised quotes that state whether the base, insulation, electrics and VAT are included, as headline prices often leave these out.
Does where you live change the cost?
In London, a garden room typically costs around £19,000 installed, about 20% above the UK average of £16,000. In the North, Scotland and Wales the guide figure is nearer £15,500.
| Region | From | Typical | Up to |
|---|---|---|---|
| Midlands / East (UK average) | £8,000 | £16,000 | £30,000 |
| London | £9,600 | £19,000 | £36,000 |
| South East / South West | £8,400 | £17,000 | £31,500 |
| North / Scotland / Wales | £7,800 | £15,500 | £29,000 |
Guide prices installed, scaled with the same regional multipliers as the calculator. Not quotes.
Garden room cost in major UK cities
| City | From | Typical | Up to |
|---|---|---|---|
| Belfast | £7,600 | £15,000 | £28,500 |
| Birmingham | £8,000 | £16,000 | £30,000 |
| Bristol | £8,400 | £17,000 | £31,500 |
| Cardiff | £7,800 | £15,500 | £29,000 |
| Edinburgh | £7,800 | £15,500 | £29,000 |
| Glasgow | £7,800 | £15,500 | £29,000 |
| Leeds | £7,800 | £15,500 | £29,000 |
| Liverpool | £7,800 | £15,500 | £29,000 |
| London | £9,600 | £19,000 | £36,000 |
| Manchester | £7,800 | £15,500 | £29,000 |
| Newcastle | £7,800 | £15,500 | £29,000 |
| Sheffield | £7,800 | £15,500 | £29,000 |
City guide estimates, scaled by local labour costs. Indicative averages for garden room, not quotes.
Less location-sensitive than wet trades, though London and the South East still cost more to build.
Compare this with a real quote
The figures above are guide prices. Two or three quotes for your garden room tell you what it costs where you live.
Free and no obligation. You answer a few questions on Bark, local pros get in touch, and you decide who, if anyone, to hire. We may earn a fee, at no extra cost to you.Common questions
Do I need planning permission for a garden room?
In England, most garden rooms are permitted development if they are single storey, under 2.5 metres high near a boundary, not in front of the house, and used for a purpose incidental to the house, such as a garden office, rather than as a bedroom, bathroom, kitchen or separate dwelling. Any outbuilding in the grounds of a listed building needs planning permission, and conservation areas and other designated land, such as National Parks, have tighter rules.
How much is a garden office for working from home?
A fully insulated, powered garden office of around 3 by 4 metres typically costs £12,000 to £20,000 installed.
What is the difference in cost between an insulated and an uninsulated garden room?
Insulation to the floor, walls and roof typically adds somewhere between £1,500 and £4,000 to a garden room, depending on its size and the specification. An uninsulated summerhouse style room can start near £8,000, while a fully insulated version of the same footprint, fit for year round use, usually lands closer to the £16,000 typical figure. Insulation also brings the need for proper heating and ventilation, so the costs tend to come as a package rather than a single line.
How much does the base or foundation for a garden room cost?
Groundworks and the base are commonly between £1,500 and £5,000, and they are often quoted separately from the headline price. A level garden with easy access and a simple ground screw or concrete pad base sits at the lower end. Sloping ground, poor soil, restricted access or the need to remove an old structure pushes the figure up. Because the base is load bearing, it is worth confirming exactly what your quote includes before comparing prices.
Does a garden room add value to a house?
A well built, insulated garden room can add value, though the amount varies by area and by how usable the space is. As a rough guide, a room costing around £16,000 might return a meaningful share of that at resale, particularly where it works as a genuine office or extra living space rather than a basic shed. Quality of build, insulation and the connection of power matter more than size. Treat any uplift as a bonus rather than the main reason to build.
Is it cheaper to build a garden room or buy one?
Building a garden room yourself is usually cheaper than buying a fully installed one, because most of a typical £16,000 job is labour. A self-build or kit assembled with your own help can come in around £8,000 to £12,000 for a similar insulated room. Savings depend on your skill, your tools and the time you can give it. Groundworks, electrics and a watertight, well-insulated shell are the parts most worth paying a tradesperson to get right.
Is a garden room cheaper than a conservatory?
A garden room and a conservatory sit in a similar price range, roughly £8,000 to £30,000 installed, so neither is reliably cheaper. The bigger difference is use. A conservatory is largely glazed and can run hot in summer and cold in winter, while an insulated garden room around £16,000 is built for year-round comfort. Compare like for like: a small lean-to conservatory can undercut a garden room, but a heated, insulated space of the same size costs much the same either way.
What is the 2.5 metre rule for garden rooms?
Under permitted development, a garden room within two metres of any boundary must not be taller than 2.5 metres overall. That is why so many garden rooms have a flat or shallow-pitch roof. Stand it more than two metres from the boundary and the limit rises to four metres for a dual-pitched roof, or three metres otherwise, but the eaves, where a roof slope or a flat roof meets the outside wall, must still be no higher than 2.5 metres. Exceed the limits and you need planning permission, and a garden room must not be used as self-contained living accommodation.
How long does a garden room last?
Anywhere from 10 to 30 years and beyond, and unusually for this kind of question the spread is almost all about what you buy rather than how you look after it. Summerhouse-grade buildings are talked about at 10 to 15 years, mid-range insulated rooms 20 to 30, and well-built ones longer again. Two specifications decide it. The roof covering, where EPDM rubber is generally quoted at 25 to 50 years while felt is nearer 15 and only if someone inspects and patches it in time. And the cladding, where timber needs re-treating every 5 to 10 years and may want replacing at 25 to 30, against fibre cement boards such as Cedral or Hardie Plank at 50 years with almost no upkeep. Both sets of figures come from suppliers. If you intend to keep it, that is where the extra money inside the £8,000 to £30,000 range is best spent, because the frame is rarely the part that fails.
Can I build a garden room myself?
Yes, a competent DIYer can build the base, frame, cladding and insulation, which is where a good share of the money goes given materials are a little over half a typical £16,000 build. That is a real saving over paying for the full labour on foundations, build and fit out. Bring in an electrician for the power and lighting: in England a new circuit to the room is notifiable under regulation 12(6A) of the Building Regulations 2010, so it needs an installer registered with a competent person scheme, who can self-certify, or notice given to building control or a registered third-party certifier before work starts. Be honest about your skills too, because a poorly insulated or damp room is unpleasant to use year round.
Does a garden room need building regulations approval?
Usually not, if it has no sleeping accommodation. In England and Wales, Class 6 of Schedule 2 to the Building Regulations 2010 exempts a detached building of 15 square metres or less with no sleeping accommodation. Between 15 and 30 square metres it stays exempt only if single storey and either at least one metre from every boundary or built substantially of non-combustible material, so a timber room against the fence needs approval, as does anything over 30 square metres. The exemption stops at the services: Part P covers electrics fed from the house, and Part G's water rules cover any supply piped from it.
Check they are registered before they start
Most fixed electrical work in a home has to meet Part P of the building regulations. Work by someone unregistered can be difficult to insure, to sign off, or to sell a house through. Checking takes about a minute and it is free.
- Registered Competent Person Electrical Electrical Safety Roundtable · The register GOV.UK points householders to for electricians who can certify their own work under the building regulations
Official guidance and sources
The rules and schemes referenced on this page come from these official UK sources. The price figures are Costwise's own; see how we price.
- Outbuildings: planning permission Planning Portal · Planning Portal's summary of the permitted development limits for outbuildings in England: height, eaves, position, half the garden, incidental use, and no rights within the grounds of a listed building.
- Permitted development rights for householders: technical guidance GOV.UK · The government's guidance on the outbuilding rules, including that incidental use excludes primary living accommodation such as a bedroom, bathroom or kitchen, and how eaves height is measured.
- Building Regulations 2010, Schedule 2 legislation.gov.uk · Class 6 exempts a detached building of 15 m² or less with no sleeping accommodation, and one of 15 to 30 m² that is at least a metre from every boundary or built substantially of non-combustible material.
- Building Regulations 2010, regulation 9 legislation.gov.uk · Even an exempt building must meet Part P for its electrics, and the Part G water requirements where its supply is piped from the house.
Cite this data
These figures are free to use in articles, reports and research under a CC BY 4.0 licence. All we ask is a credit to Costwise, and online a link. Where your style allows, please make "Costwise" the linked word so readers can check the figure for their own region.
Costwise (2026): A garden room typically costs £16,000 in the UK, ranging from £8,000 to £30,000 installed. Reviewed June 2026. costwiseuk.co.ukSource: Costwise (costwiseuk.co.uk)Costwise (2026). Garden room cost. Costwise UK cost data, version 2026-09-28. https://costwiseuk.co.uk/garden-room-cost/2026-09-28 (156 jobs)Dataset DOI: 10.5281/zenodo.21159943 · also on Kaggle, Hugging Face and Figshare. Method: how we price. Downloadable CSV.
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.