Garden Room Cost: 2026 Prices, Sizes & Planning UK
A garden room gives you an extra room without the cost, mess and planning headaches of an extension. It can be a quiet office away from the kitchen table, a gym, a studio, a place for teenagers to hang out, or simply somewhere to sit and look at the garden in winter.
Prices start lower than most people expect and rise faster than most people plan for. In 2026, a small self assembly garden room kit starts from around £2,500, while a premium, fully finished small room can cost about £8,000 before you add a base, electrics and furnishings. Bespoke, larger rooms built by specialist firms can run well into five figures.
This guide breaks down garden room costs by type and size, explains what is and is not included, and covers foundations, electrics, planning permission and building regulations.
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Prices by size
The size and type of room are the biggest factors in the price. Here are typical UK prices from Checkatrade's 2026 guide.
| Type of garden room | Low | High | Average |
|---|---|---|---|
| Mini garden room, delivered for self assembly | £2,500 | £8,000 | £5,250 |
| Larch clad insulated office, not assembled | £2,500 | £6,000 | £4,250 |
| Basic small insulated office, assembled | £3,200 | £7,800 | £5,500 |
| Home office pod | £3,500 | £20,000 | £11,750 |
Checked October 2026: Checkatrade, How much does a garden room cost in the UK: 2026 prices (tables last updated June 2026).
Checkatrade's separate outbuilding guide puts a fully fitted garden office with electricity and insulation at around £7,500 (checked October 2026).
Extra costs per item
The base kit is only the start. These are the add ons most rooms need:
| Item | Unit | Low | High | Average |
|---|---|---|---|---|
| Assembly labour, two people | per project | £700 | £1,800 | £1,250 |
| Deck base | per m² | £80 | £100 | £90 |
| Flat roof | per m² | £86 | £120 | £103 |
| Green sedum roof system | per m² | £60 | £80 | £70 |
| Electrical work | per hour | £35 | £45 | £40 |
| Decorating | per hour | £25 | £35 | £30 |
| uPVC windows or doors | each | £600 | £1,200 | £900 |
Checked October 2026: Checkatrade, How much does a garden room cost in the UK: 2026 prices.
Example budgets
To show how the costs stack up, here are three illustrative budgets built from the figures above. They are examples, not quotes.
| Project | What is included | Rough total |
|---|---|---|
| Budget DIY office | Mid range kit (£4,250), deck base 8m² (£720), you assemble it, electrician for 8 hours (£320) | about £5,300 plus cable and fittings |
| Assembled insulated office | Assembled insulated office (£5,500), deck base 10m² (£900), electrician for 12 hours (£480), decorating 8 hours (£240) | about £7,100 |
| Premium pod | Office pod (£11,750 average), base and electrics on top | £14,000 and up |
The main lesson is that a room advertised at £4,000 rarely ends up costing £4,000 once it has a base, power and a finished interior.
Spec levels
Garden rooms vary enormously in quality. The price difference between two rooms of the same size often comes down to what is inside the walls.
Entry level
- Timber frame with basic cladding
- Little or no insulation
- Single or basic double glazing
- Felt roof
- Suitable for summer use, storage or a hobby space
These are close to a high quality shed. They can get very hot in summer and cold in winter.
Mid range
- Insulated walls, floor and roof
- Double glazed windows and doors
- Durable roof covering such as EPDM rubber
- Internal walls lined with board or plasterboard
- Suitable for year round use with a heater
This is the level most people want for a home office.
Premium
- Thick insulation and high performance glazing
- Architectural cladding such as cedar, composite or charred timber
- Bi-fold or sliding doors, roof lights
- Integrated lighting, data cabling, heating and air conditioning
- Optional shower room or kitchenette
Premium rooms are built to feel like part of the house, and are often designed and installed by specialist firms.
What a kit usually includes
Most kits include pre cut wall, floor and roof panels, doors and windows, external cladding and roofing, and basic fixings. Insulation and internal finishes are often extras, especially on entry level models. Always check what is included before you compare prices.
Foundations
Every garden room needs a solid, level base. The right choice depends on the ground, the size and weight of the room, and access to your garden.
| Base type | Good for | Notes |
|---|---|---|
| Timber deck base | Light rooms on level ground | Checkatrade average about £90 per m² |
| Concrete slab | Heavier rooms, long life | Needs digging, hardcore and concrete |
| Ground screws | Sloping or awkward sites | Quick, little digging, popular with installers |
| Concrete pads | Small rooms on firm ground | Cheaper than a full slab |
A concrete slab is the traditional choice and very durable, but it involves digging out, laying hardcore and pouring concrete, which is hard work if the garden has no side access. Ground screws are driven into the soil like giant screws and support a timber frame. They are quick, cause little mess and suit sloping gardens.
Our guide to laying foundations explains the basics, and our concrete calculator helps you work out how much concrete a slab needs.
Access
If the room is going at the bottom of a long garden with no side access, every panel and bag of concrete has to be carried through the house. Installers will price that in. Measure your side gate or path before you order.
Electrics
Most people want lights, sockets and heating in a garden room, and many want a data connection for working from home. Electrics are where costs can climb.
What is involved
Power usually comes from the house through an armoured cable buried in a trench or clipped along a wall or fence. The electrician connects it to a new circuit in your consumer unit and fits a small consumer unit inside the garden room. From there, they wire lights, sockets and any heater or air conditioning.
Checkatrade puts electrical work at around £35 to £45 per hour. The total depends mainly on the distance from the house, whether the cable has to be buried, and how much is being installed in the room.
Things that push the cost up
- Long cable runs. A room at the bottom of a long garden needs a longer, thicker cable.
- Trenching across lawn or patio.
- A consumer unit upgrade at the house if there is no spare capacity. See our fuse box replacement guide.
- Electric heating and air conditioning, which need suitably sized circuits.
- Data cabling if Wi-Fi does not reach.
Regulations
Adding a new circuit to an outbuilding is notifiable electrical work under the Building Regulations in England and Wales. It must be done by a registered electrician who can self certify, or be inspected by building control. Our guide to electricians explains how to check registration.
Internet
Home Wi-Fi rarely reaches the bottom of the garden well. Options include a mesh Wi-Fi system, a powerline adapter on the room's circuit, or a data cable run alongside the power cable. Running a data cable at the same time as the power cable is cheap. Adding it later is not.
Plumbing
Adding a toilet, sink or shower turns a simple project into a complicated one, involving water supply, drainage and possibly a pump. It also has bigger implications for planning and building regulations. Get advice early if you want plumbing.
Planning
Many garden rooms do not need planning permission, because they fall under permitted development rights for outbuildings. To stay within those rights in England, a garden room generally needs to meet conditions including:
- It must be used for purposes incidental to the house, such as an office, gym or hobby room, not as separate living accommodation.
- It must not be in front of the principal elevation of the house (usually the front).
- It must be single storey.
- If it is within 2m of a boundary, the maximum height is 2.5m.
- Elsewhere, the maximum height is 4m for a dual pitched roof or 3m for any other roof, with eaves no higher than 2.5m.
- Outbuildings and extensions together must not cover more than half the land around the original house.
- No verandas, balconies or raised platforms over 30cm high.
These rules are different for listed buildings, homes in conservation areas, national parks and areas of outstanding natural beauty, and for flats and maisonettes, which do not have the same permitted development rights. Rules also differ in Scotland, Wales and Northern Ireland.
If in doubt, you can apply to your council for a lawful development certificate, which confirms that a project does not need planning permission. It is useful evidence when you sell the house.
Sleeping in a garden room
Using a garden room as a bedroom or annexe changes things. Living accommodation is not incidental use, so it usually needs planning permission, and it brings in building regulations for fire safety and insulation.
Building regulations
Separate from planning, building regulations deal with how a building is built. Small detached outbuildings are often exempt:
- Under 15m² internal floor area: generally exempt, provided there is no sleeping accommodation.
- 15m² to 30m²: generally exempt if there is no sleeping accommodation and the building is at least 1m from any boundary or is built substantially of non combustible materials.
- Over 30m²: usually needs building regulations approval.
Electrical work is covered by building regulations whatever the size of the room, as explained above.
Heating and comfort
A well insulated garden room needs surprisingly little heating. Common options include:
- Electric panel heaters: cheap to buy and fit, simple to control.
- Air conditioning units: heat in winter, cool in summer, and are efficient. They cost more to install.
- Electric underfloor heating: comfortable and invisible, best fitted during the build.
Summer overheating is a bigger problem than many expect, especially with a lot of glass facing south. Good insulation, opening windows, blinds and an overhanging roof all help.
Cladding and materials
The outside of a garden room takes the weather every day, so the cladding affects both looks and long term upkeep.
| Cladding | Look | Upkeep |
|---|---|---|
| Softwood (treated pine or spruce) | Traditional timber | Needs regular treatment or staining |
| Larch | Warm, natural timber that silvers with age | Durable, can be left untreated |
| Western red cedar | Premium timber with a rich colour | Durable, often left to weather |
| Composite | Timber effect boards in fixed colours | Very low maintenance |
| Charred timber | Dark, textured finish | Low maintenance, premium price |
Untreated larch and cedar turn silver grey over time. If you want to keep the original colour, you will need to treat them regularly.
Insulation and glazing
Insulation is what turns a summerhouse into a year round room. Look for insulation in all three parts of the building: walls, floor and roof. A room with a well insulated roof but a thin floor will still feel cold underfoot.
Glazing matters too. Big glass doors make a garden room feel open and bright, but glass loses more heat than an insulated wall and lets in a lot of sun. Double glazing is the minimum for a room you plan to use in winter. Think about which way the glass faces. South facing glass brings warmth in winter but can make the room uncomfortably hot in summer without blinds or shading.
Security and insurance
A garden office often holds expensive laptops, monitors and gym equipment, so security matters:
- Fit multi point locks on doors and locks on windows.
- Add an outside light with a motion sensor.
- Consider a camera or alarm sensor linked to your home system.
- Keep valuables out of sight from the garden.
Tell your home insurer about the room and its contents. Many policies have low limits for outbuildings, and you may need to increase cover. If you run a business from the room, check whether you need business cover as well.
Maintenance
A good garden room needs little upkeep, but a yearly check keeps it in shape:
- Clear leaves from the roof and gutters.
- Check the roof covering for damage after storms.
- Treat or restain timber cladding as the maker recommends.
- Check seals around doors and windows.
- Keep plants and soil away from the base of the walls so timber stays dry.
- Air the room regularly, especially in winter, to prevent condensation.
Garden room vs extension
| Factor | Garden room | Single storey extension |
|---|---|---|
| Typical cost | From a few thousand pounds | Tens of thousands of pounds |
| Planning | Often permitted development | Often permitted development, sometimes full planning |
| Build time | Days to a few weeks | Months |
| Disruption to the house | Minimal | Significant |
| Use | Separate space | Part of the house |
| Effect on value | Modest | Usually larger |
If you want a separate space for work or hobbies, a garden room is usually far cheaper. If you need a bigger kitchen or more living space in the house itself, see our extension cost guide.
Garden room vs shed
A shed is for storage. A garden room is for people. The differences are insulation, glazing, electrics and an internal finish. If you only need storage, a shed costs far less.
Choosing a supplier
- Visit a show site if you can, and look at the insulation, windows and finish up close.
- Ask for references and photos of rooms they have installed locally.
- Check what the price includes: base, delivery, assembly, electrics, internal finish.
- Ask about warranties on the structure, roof and glazing.
- Confirm who is responsible for checking planning and building regulations.
FAQs
How much does a garden office cost?
A basic assembled insulated office averages about £5,500 in 2026, and a fully fitted office with power and insulation is around £7,500. Premium pods average about £11,750.
Do I need planning permission for a garden room?
Often not, if it meets the permitted development conditions for outbuildings. Listed buildings, conservation areas and flats are common exceptions. Check with your council.
How long does it take to build a garden room?
A kit can go up in a few days. A bespoke room with a concrete base, electrics and internal finish can take a few weeks.
Can I use a garden room all year round?
Yes, if it is insulated and heated. Entry level rooms without insulation are best kept for warmer months.
Does a garden room add value to my house?
A well built, insulated room can appeal to buyers, especially people who work from home. A cheap, poorly finished room can put buyers off.
Can I put a garden room close to the fence?
Yes, but within 2m of a boundary the maximum height under permitted development is 2.5m, and building regulations exemptions for rooms of 15m² to 30m² depend on distance from the boundary.
Can I build a garden room myself?
Many kits are designed for DIY assembly by two people. The electrics must be done or signed off by a registered electrician.
What size garden room do I need?
For a one person office, about 2.5m × 2.5m gives room for a desk, chair and storage. A gym or studio usually needs more, around 3m × 4m. Mark the footprint out on the lawn with string before you order, and check the room will not dominate the garden.
Can I run a business from a garden room?
Working from home in a garden office is usually fine. If clients or staff visit regularly, or the use changes the character of the property, you may need planning permission. Check with your council if in doubt.
Get quotes
When you ask for quotes, give each supplier the same brief: size, use, where in the garden it will go, access, and whether you want power, data and heating. Ask for a breakdown that separates the room, the base, electrics and any internal finishing.
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