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Considering a garden room to add extra living space without the cost and disruption of a full extension? Smart move.

There is a whole host of uses for a garden room – from an at-home gym or office, to a hobby room or simply a place to relax.

In this guide, we break down average prices, what affects the cost of a garden room, and answer the most common questions homeowners ask.

How much does a garden room cost in the UK?

The cost of an off-the-shelf, self-assembly garden room can start from around £2,500.

But to create a fully functional, year-round space, you’ll also need to budget for other essentials. Think insulation, electrics and finishing touches.

Let's get into it.

What’s included in the cost of an off-the-shelf garden room?

Most off-the-shelf garden rooms come as a kit, with the main structure and essential components included. Typically, you can expect:

• Pre-cut structural panels (walls, floor and roof)

• Doors and windows (often double-glazed)

• External cladding and roofing materials

• Basic fixings and instructions for assembly

Some higher-spec models may also include insulation and internal wall finishes, but this varies by supplier.

What might not be included?

Add-on elements, such as electrics and insulation, can make a substantial difference to the final price.

So it’s important to look beyond the base kit cost when planning your budget. These could include:

• Professional installation (if needed) – Approximately £1,250 per project

• Electrician (for lighting, sockets & wiring, and electric heating) – Budget £40 per hour

• Plastering and decorating – Set aside £30 per hour

• Insulation – Not always included in entry-level models

To avoid unexpected costs, it's always best to speak to a garden room installer for an exact quote.

Landed here looking specifically for garden office costs? That's up next.

Cost for a garden office

Garden office pods can be a game-changer for anyone living in a busy home that needs a quiet space for remote working.

Here's the difference in price for an off-the-shelf vs an 'all-singing, all-dancing' garden office pod:

• A Larch cladding insulated office (not assembled) costs on average £4,250

• Meanwhile, a basic, small, insulated office (assembled with the help of a garden office builder) costs on average £5,500

• A turnkey garden office pod with double-glazing, insulation and felt roofing can cost on average £11,750

Get an accurate quote for a garden room near you

See available local garden house installers, read customer reviews, and get in touch directly for a quote using our free mobile app.

On Checkatrade, you'll only find trades who meet our high standards and pass up to 12 checks.

Garden room projects: cost calculator

Looking for a garden room cost - either average or approximate? Why not try our free interactive cost calculator below for an instant estimate?

Or read on to learn how much a garden room costs, if you're planning a man-cave or children's den.

Job Estimate Calculator

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Cost for a garden man cave (or she-shed!)

Dreaming of a chillout den with a pool table and mini-bar set-up? Or perhaps you need the extra space for a workshop or home gym?:

• A low shed with insulation and power will cost anything from £1,500 to £2,500

• A large, high-spec log cabin or custom brick-built cabin will cost anywhere from £15,000 to £30,000

Cost for a children’s garden den

Planning a Wendy house for your little one? Or perhaps you're after a more elaborate treehouse-style hangout to earn brownie points with your tweens and teens? Here's the costs involved:

• A children's garden playhouse will cost between £430 - £1,300

• Meanwhile, a treehouse project usually costs around £2,500

• A more advanced raised platform project (think softwood deck with railings and stairs) costs around £2,200

• Don't forget the added labour cost of around £360 per day if you need help building it

What affects the cost of a garden room?

Here are some of the different factors that will determine the overall cost of a garden room:

• The size of the garden room

• Whether you choose a modular or bespoke design

• The materials you use (for instance, a brick garden room cost will be a lot higher)

• The design features you choose, such as doors and windows

• The interior of your garden room, for example, plastering and cladding

• Whether you need electrics or plumbing

• Whether you need landscaping, such as a pathway leading to the garden room

Is building a garden room worth it?

For many homeowners, a garden room is a cost-effective way to add flexible living space without the disruption of an extension. Key benefits include:

• Faster to build than an extension – Most projects are completed in a few weeks

• Versatile use – Ideal as a home office, gym, playroom or hobby space

• Maximises space in a garden – Even in smaller outdoor spaces

• Adds usable square footage – Without altering your main home

• Can increase property value – Especially with a high-quality, insulated build

Garden room cost checklist

• Get expert advice: Speak to a checked garden room installer for accurate quotes and design advice

• Compare quotes: Get at least three quotes for a fair, competitive price

• Choose a vetted professional: Look for proven experience with garden room builds and ask to see photos of previous jobs

• Check what’s included: Confirm whether foundations and internal finishes are part of the price

• Ask about extras: Factor in additional costs like electrics, heating, plumbing and groundwork

• Consider year-round use: Investing in insulation and heating upfront pays off in the long run and adds value to your home

• Book ahead: Demand can be high in spring and summer, which may affect availability and pricing

Why use Checkatrade to find garden room installers near you?

• Checked - Every Checkatrade member must pass up to 12 checks and commit to upholding the Checkatrade Standard

• Reviewed - Over 6.2 million reviews have been published on Checkatrade on everything from communication, tidiness, timekeeping, and quality of work

• Guaranteed - Jobs booked through Checkatrade are covered up to £1,000 (T&Cs apply)

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