COST GUIDES
How much does it cost to insulate a garage?
Updated 07/26
Costs for insulating a garage will vary greatly based on whether it is a single or double garage. Figures quoted can cover walls, roof and floor treated together. That's the most cost-effective way to do the job. Read on for a full breakdown by surface, plus what pushes the price up or down.
Fast Facts
Single garage insulation: £3,000-£4,500 on average
Double garage insulation: £5,000-£7,500 on average
Labour rate: Around £30-£45 per hour
Get a few quotes from different tradespeople before deciding
How much does it cost to insulate a garage in the UK?
The table below covers the main insulation options for a garage (walls, roof, floor and door) with per-m² rates for supply and fit. Labour is included in all figures except the door, which is usually a DIY job.
| Cost of provided item | Unit | Average cost (excl. VAT) |
|---|---|---|
| Garage wall insulation (supply and fit insulated plasterboard) | per m2 | £50 |
| Garage wall insulation (supply and fit new stud wall with cavity in between) | per m2 | £55 |
| Garage roof insulation (supply and fit rigid foam insulation) | per m2 | £40 |
| Garage roof insulation (supply and fit rigid foam insulation AND plasterboard finish) | per m2 | £50 |
| Garage floor insulation (supply and fit rigid foam insulation on top of existing concrete base) | per m2 | £40 |
| Garage door insulation (supply only draught seals and adhesive foil to inside of door) | £100-£200 | |
| Average cost to insulate single garage (85m2) | £3,000-£4,500 | |
| Average cost to insulate double garage (140m2) | £5,000-£7,500 | |
| Average cost of labour to insulate a garage | Per hour | £30-£45 |
| Average cost of labour to insulate a garage | Per day | £240-£360 |
| Last updated: July 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||
For a typical single garage, treating all four surfaces (walls, roof, floor and door) puts you toward the top of the £3,000-£4,500 range. Walls and roof only sits closer to the lower end.
What affects the cost of insulating a garage?
The biggest variable is how much of the garage you're insulating.
Tackling walls, roof, floor and door at once costs more upfront but gives you the best result. It also avoids the hassle of coming back to each surface separately.
1. Garage size
Single vs double garage is the biggest price driver. A single garage typically costs £3,000-£4,500 and a double £5,000-£7,500. The per-m² rates stay the same. You just have more surface area to cover.
2. Which surfaces you insulate
Walls alone vs walls + roof + floor + door makes a big difference to the total. Many homeowners start with walls and roof because that's where most heat escapes.
Adding the floor extends the job by roughly half a day. The door is usually DIY.
3. Insulation type
Rigid foam (PIR/PUR boards like Kingspan or Celotex) costs more than mineral wool or multifoil but performs better in a constrained space. Insulated plasterboard is a mid-range option that gives you a finished wall surface in one step, at £50 per m2.
You can also read about cavity wall insulation if you're comparing options for an attached garage.
4. Whether you're converting to habitable space
If you plan to use the garage as a bedroom or living room, building regulations require specific U-values. That usually means thicker insulation and a checked installer to sign off compliance. Both add cost.
5. Location and access
Labour rates vary by region. Expect to pay more in London and the South East. Difficult access (very low headroom, shared walls) adds time.
What's the average cost of insulating garage walls?
Insulating your garage walls reduces unwanted draughts and, in an attached garage, improves your home's overall energy efficiency. There are two main options:
Insulated plasterboard. Supply and fit costs around £50 per m2. This gives you a finished wall surface in one step.
New stud wall with cavity. Supply and fit costs around £55 per m2. A stud wall is built in front of the existing garage wall, with insulation packed into the cavity.
PIR boards (Kingspan, Celotex) are a popular alternative to traditional plasterboard. They give a better U-value in a thinner profile, so worth asking your installer about if you're working with limited depth.
These costs relate to internal insulation only. Read our cost guide for external wall insulation if your garage shares a wall with the house.
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How much does it cost to insulate a garage roof?
Rigid foam insulation can be used on a garage roof at around £40 per m2 for supply and fit. Adding a plasterboard finish to cover the insulation takes the cost to around £50 per m2.
The approach differs between flat and pitched roofs. Flat garage roofs typically use PIR board laid on top of the existing structure. Pitched roofs more commonly use rafter insulation fitted between the timbers.
Make sure you specify which type you have when asking for quotes. The method and cost can vary.
Adding insulation to your home: your complete planning guide
Unless your home was deliberately constructed to be energy efficient, you can probably lower your energy bills by adding more insulation. Here’s the lowdown.
What's the cost of insulated garage doors?
Insulating an existing garage door with a DIY kit (adhesive foil and draught seals) costs around £100-£200 for supply only. The kits (brands like EcoPro, SuperFOIL and Thermawrap) come with everything you need and take an afternoon. This is the standard approach for most homeowners.
If you're looking at replacing the door with a fully insulated one instead, that's a separate job.
Garage door replacement: Cost breakdown 2026
If you’re looking to replace your existing garage door, it’s important you find the right one. And with so many choices out there that can be a tall order. We’ve put together this garage door replacement cost guide to show you average prices in the UK.
What's the average cost to insulate a garage floor?
To supply and lay rigid foam insulation on top of an existing concrete floor, you're looking at around £40 per m2.
One thing to plan for: insulating the floor raises the finished floor level by the thickness of the board, typically 25–100mm.
That can affect headroom and may mean adjusting the bottom of the garage door. Worth flagging to your installer before they start.
Find a local tradesperson to help you with your insulation
Overall, how much will it cost to insulate my garage?
On average, expect to pay between £3,000-£4,500 for a single garage and between £5,000-£7,500 for a double. Labour runs at around £30-£45 per hour, and will vary depending on your location.
If budget is tight, a walls-only job is the minimum viable scope for an attached garage. That's where most of the heat loss happens.
A full walls-roof-floor-door treatment gives the best result but costs proportionally more. Knowing which scope you need before contacting a tradesperson helps you compare quotes like for like.
Is it worth insulating a garage?
For an attached garage, insulating the shared wall with your house can reduce heat loss and take pressure off your central heating. That's particularly true if your garage has a room above it.
For a detached garage you use as a workshop or gym, insulation is more about comfort than energy savings, but it makes a real difference in winter.
There are three main cases where insulating is clearly worth it:
Attached garage
Reducing heat loss through the shared wall lowers heating bills. This is relevant for homes where the garage adjoins a living space or has a habitable room above.
If you're thinking about improving your home's thermal efficiency more broadly, the shared wall is a good place to start.
Detached garage used as a workshop or gym
Insulation makes the space usable year-round. Most people who do it say it's worth every penny.
Planned conversion
If you're planning a garage conversion, insulation isn't optional. Building regulations require specific U-values, so you'll need a checked installer to sign off compliance.
You might also want to look at loft insulation costs if you're working through your home's energy performance more broadly.
Find reviewed insulation specialists near you, look for insulation costs for external walls, or check out the planning process for insulation, all on Checkatrade.
Should you insulate a garage yourself or hire a tradesperson?
Insulating a garage door is one of the easier DIY jobs. The kits come with everything you need and don't require specialist skills. Laying rigid foam floor boards is also manageable for a confident DIYer.
Walls and roof are a different matter.
Getting the vapour barrier right and achieving a clean plasterboard finish takes experience. If you're converting the space to a habitable room, a checked tradesperson needs to sign off compliance with building regulations.
For a step-by-step guide to the method, read our guide on how to insulate a garage.
Unless your home was deliberately constructed to be energy efficient, you can probably lower your energy bills by adding more insulation.
Garage insulation cost: job estimator tool
Not sure what your garage insulation job will cost? Use our calculator to get a quick estimate based on your garage size and which surfaces you're insulating.
Job Estimate Calculator
How to find an insulation specialist
Finding an insulation specialist is easy with Checkatrade. We check, verify and approve all of our members. All of the tradespeople in our directory meet our high quality standards.
Use our quick and easy request a quote feature and we'll get experienced local insulation specialists to contact you directly. To get accurate quotes, be as detailed as you can:
Which surfaces you want to insulate (walls, roof, floor, door, or all four)
Whether the garage is attached or detached
The approximate size (single or double)
Whether you need building regulations compliance (e.g. for a conversion)
Any access restrictions the installer should know about
Find an insulation specialist covering your area
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Garage insulation cost checklist
Garage insulation checklist
Before contacting a tradesperson, work through these six points:
Garage insulation cost FAQs
Insulating a single garage typically costs around £3,000–£4,500 for walls, roof and floor combined. A double garage runs at about £5,000–£7,500. Labour can be in the region of £30–£45 per hour depending on your location.
The cheapest approach is to start with the garage door. DIY insulation kits using adhesive foil and draught seals can cost £100–£200 and take several hours to install. If you're tackling the walls and roof, rigid foam boards are the most cost-effective material, though you'll still want a tradesperson to fit them neatly and handle any vapour barrier work.
In most cases, no. Insulating a garage is classed as routine maintenance and doesn't require planning permission. The exception is if you're converting the garage into a habitable space. In that case, building regulations apply and you'll need to meet specific U-value requirements for the insulation.
It depends on how you use the space. For an attached garage, insulating the shared wall reduces heat loss from your home and can lower heating bills. For a workshop or gym, insulation makes the space far more comfortable in winter. Most people who do it say it's worth every penny.
A straightforward walls-and-roof job on a single garage typically takes a tradesperson one to two days. Adding the floor extends that by half a day. A full insulation and plasterboard finish for a conversion can take three to five days depending on the size of the space.
Yes, you don't have to insulate every surface. Walls are usually the priority for an attached garage because they're the main route for heat loss. If budget is a concern, start with the walls and add the roof and floor later.
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