How much does a garage conversion cost in the UK?

Garage conversions in the UK typically range from £7,000 to £20,000 depending on size, layout, finishes, and whether structural alterations are needed.

Do garage conversions add value to your home?

Yes. A properly converted garage that meets building regulations can add significant value by increasing your home’s usable living space, especially in desirable areas.

Do I need building control for a garage conversion?

Yes, most garage conversions require building control sign-off to be classed as habitable space. We handle this process as part of our service.

Can you quote me for my garage conversion?

Absolutely. We offer free, no-obligation quotes across York, Selby, Harrogate and surrounding areas. Just fill out our enquiry form or call us directly.

How Much Does a Garage Conversion Cost

Q: What affects the cost of a garage conversion?

Factors include structural work, insulation, new doors/windows, electrics, plumbing, finishes, and whether you’re creating a gym, bedroom, office, or open-plan living area.

Find out how much a garage conversion costs. Compare prices, key variables & what affects cost. Free quotes in York, Selby & surrounding areas.

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Turn a cold, unused garage into a warm, liveable part of your home.

How Much Does a Garage Conversion Cost?

Looking to convert your garage into a liveable, value-boosting space? Whether you're planning a home office, gym, cinema room or guest suite, this guide breaks down what a garage conversion typically costs in the UK — and what variables affect the price.
At Monument Garage Conversions, we’ve helped countless homeowners across York, Selby and surrounding areas create beautiful, functional garage conversions. Here's what you need to know before you start.

Average Garage Conversion Costs

Garage Type	Average Cost Range
Single (Attached)	£10,000 – £15,000
Single (Detached)	£15,000 – £25,000
Double Garage	£20,000 – £45,000+
Cost per m² (Average)	£625 – £1,250

Compared to a house extension (£2,000–£3,500/m²), garage conversions offer exceptional value per square metre.

What Affects the Cost of a Garage Conversion?

There’s no one-size-fits-all price — here are the biggest variables that impact cost:

Garage Type & ConditionIntegral garages are cheapest to convert
Detached garages often need extra insulation, access, and structural work
Intended UseHome office or snug: lower cost
Kitchens, bathrooms or bars: require plumbing, heating & higher-grade finishes
Structural AlterationsReplacing the garage door
New windows and side doors
Removing internal walls or adding openings
UtilitiesNew electrics, heating, lighting
Radiators or underfloor heating
Plumbing or drainage (for bathrooms/kitchens)
FinishesFlooring, plastering, decorating
Bespoke joinery, lighting, storage

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Typical Budget Ranges by Project Type

Project Type	Cost Estimate
Basic Office / Bedroom	£8,000 – £12,000
Home Gym / Cinema	£12,000 – £18,000
Bathroom / Utility	£15,000 – £25,000+
Full Knock-Through	+£1,500 – £5,000 (structural)
Project Type	Cost Estimate
Basic Office / Bedroom	£8,000 – £12,000
Home Gym / Cinema	£12,000 – £18,000
Bathroom / Utility	£15,000 – £25,000+
Full Knock-Through	+£1,500 – £5,000 (structural)

How Long Does a Garage Conversion Take?

Most garage conversions are completed in 2 to 4 weeks
Projects involving plumbing, steelwork, or large openings may take longer
We provide clear, realistic timelines from day one

Does a Garage Conversion Add Value to Your Home?

Yes — and significantly.

Adds usable, habitable space
Fully compliant with Building Regulations and signed off by Building Control
Can boost property value by 10% to 15%
Adds lifestyle value and increases buyer appeal