Garage conversion cost
Most single garage conversions cost between £14,500 and £23,000. Smaller jobs, like converting half the garage, can cost less, and an annexe costs more. What moves the price most is plumbing, opening into the house and the state of the garage.
Work out what yours could cost
Typical for a job like yours
£14,500 to £23,000
- ↓Lower: dry garage, simple floor, services close by
- ↑Higher: floor raising, damp, a higher-spec finish
A guide to typical prices, including VAT. Your exact price is confirmed at the visit.
Budget tighter? A smaller job costs less. .
How much does it cost to convert a garage into a room?
Work out yours
Bedroom£14,500 to £23,000
Home office£14,500 to £23,000
Home gymUsually from around £12,000
PlayroomUsually from around £12,000
Living or family room£14,500 to £23,000
Garden room£14,500 to £23,000
Studio£14,500 to £23,000
Utility roomUsually from around £13,000
Bigger kitchenUsually from around £13,500
Bedroom with en-suite£21,000 to £32,500
Annexe£33,500 to £54,000
Smaller job in mind? Tell us what you need and we will price it.
By garage type
The size of the garage, and whether it is joined to the house, move the price most. A detached garage costs more because every wall and the roof need insulating, and power and water come across from the house.
Keeping storage at the front costs less. A room in the roof above the garage is a separate job, priced on its own.
| Your garage | Typical cost |
|---|---|
| Single garage | £14,500 to £23,000 |
| Integral garage | £14,500 to £23,000 |
| Double garage | £25,000 to £42,000 |
| Detached garage | £21,500 to £42,000 |
| Half a garage | Usually from around £9,000 |
| Garage loft | £18,000 to £36,000 |
What adds to the cost of a garage conversion?
The things that most often add to a job, and what they typically cost on top.
Add them in the calculator| Extra | Typical cost |
|---|---|
| A shower room | £6,500 to £9,500 |
| Downstairs toilet (WC) | £3,000 to £5,000 |
| Opening into the house (steel beam) | £4,000 to £9,000 |
| Raising a low floor | £1,000 to £5,000 |
| Damp work | £2,500 to £6,000 |
| Bi-fold doors instead of a window | £2,500 to £5,000 |
| Electric underfloor heating | £1,500 to £3,500 |
| Moving the gas meter | £792 to £1,206 |
Want a price for your garage? Tell us what you want it to become.
Get a quoteQuestions about cost
Something we have not covered? Ask us when you send your details and we will answer it at the visit.
Ask us a questionWhat is the average cost of a garage conversion?
Most single garage conversions cost £14,500 to £23,000, VAT included. A double garage typically costs £25,000 to £42,000. Adding a shower room, opening into the house or a poor floor moves the price up.
How much does a garage conversion cost per square metre?
For a typical single garage of about 15 square metres, our range works out at roughly £970 to £1,530 per square metre, VAT included. Smaller garages cost more per square metre, because the new wall, the window and the building control fee cost much the same whatever the size.
Is VAT included in garage conversion prices?
Every price on this page includes VAT. Some builders quote prices plus VAT, so check before you compare two quotes.
What should a garage conversion quote include?
The whole job, described room by room, with what is included and what costs extra. It should say who applies to building control and whether that fee is in the price. It should also give how long the work will take, when payments are due, and what happens if something unexpected turns up.
Are planning and building control fees extra?
The building control fee is included in our prices: Solihull Council charges £570 for a single garage. Most conversions need no planning permission, but if yours does, the council fee is £548 on top. A lawful development certificate, optional proof you do not need permission, is £274.
Is a garage conversion cheaper than an extension?
Usually, for the same amount of space, because the walls, roof and foundations are already there. An extension has to build all of those from scratch, which also takes longer.
Do you take on smaller jobs?
Yes, and they are welcome. Some garages only need half converting, or a simpler finish, which brings the price down. Describe the job and we will give you a written price.
How long does a garage conversion take?
Most single garage conversions take two to four weeks on site. A bedroom with an en-suite takes around three to seven weeks, and an annexe eight to twelve. Ask how long yours will take when we visit.
Prices checked 14 October 2026 and include VAT. Building control fees from Solihull Council's 2026 to 2027 fee list. Planning fees from the national fee schedule for England from 1 April 2026.
Get a written price for your garage
Tell us what you want it to become. We will be in touch to arrange a visit, and you get a written price before any work starts. We work across Solihull, Birmingham, Coventry and the rest of the West Midlands.
- We visit to measure up and talk it through.
- You get a written price before any work starts.
- Our prices are on this page, so you know the range before we come.