Garages are typically quite large, and whilst many households use them for their original purpose, a growing number of people are deciding to convert them into entirely new spaces.
Since garages are ground floor or may even be detached from the house entirely, the works are less disruptive than for loft conversions or other types of extensions.
They’re also usually covered by Permitted Development, meaning only a small percentage of garage conversions require full Planning Permission.
This article will cover the costs involved in converting a garage in the UK, factors affecting the cost and other common questions around converting a garage.
Average Conversion Cost
We’ve compiled price data from 8 garage converters and 13 secondary sources to generate the following average garage conversion prices. These are all-in costs that include VAT, but exclude Planning Permission.
The main cost factor is the type of garage. There are 3 main types of garage:
- Integral; where the garage is inside the house itself
- Attached; where the garage is attached to the house, possibly divided by a corridor. It will have its own flat or pitched roof.
- Detached; where the garage is completely detached from the house
Costs are highest for detached double garage conversions with roof extensions and lowest for single-storey integrated garage conversions that are linked to the house.
|Integral Garage||Attached Garage||Detached Garage|
|Single Garage (6m x 3m)||£8,000 to £11,000||£10,000 to £12,000||£10,000 to £15,000|
|Single Garage High-End (6m x 3m)||£12,000 to £13,500||£14,000 to £20,000||£20,000 to £25,000|
|Double Garage (6m x 6m)||£15,000 to £18,000||£22,000 to £28,000||£30,00 to £35,000|
|Double Garage High-End (6m x 6m)||£25,000+||£35,000+||£50,000+|
The main costs include:
- Structural integrity and foundational checks, upgrades may be required for attached or detached garages
- Removing garage doors and replacing with walls, windows and doors
- Insulation and heating
- Electricity, plumbing and gas
- Architectural fees and admin costs
- Some interior design costs (e.g. flooring, plastering, lighting, etc)
- Knocking through a singular wall
There are some additional costs for building specific types of garage conversions such as home gym garage conversions, kitchen garage conversions, bedroom garage conversions, home office conversions, etc.
Adding a pitched roof will also increase the cost (and may require Planning Permission).
|Kitchen (Open-Plan)||£1,000||£1,000 to £2,500||£5,000+|
|Gym||£500||£1,000 to £2,000||£2,000+|
|Spa/Bathroom||£1,000||£1,000 to £2,000||£3,000+|
|Bedroom||£500||£1,000||£2,000+ (with en-suite)|
Choosing a Builder or Architectural Agency
There are many reputable garage conversion specialists around the UK. You can look for some of the following accreditations when choosing one. Make sure that the firm has a proven track record and a portfolio of successful projects to look at.
- The Federation of Master Builders (FMB)
- The Guild of Builders and Contractors
- The Chartered Institute of Building (CIOB)
- The Chartered Association of Building Engineers (ABE)
- The National Federation of Builders (NFB)
- The Association of Specialist Underpinning Contractors (ASUC)
Other professionals collaborating on the project may also ideally be part of the following organisations and schemes:
- Plumbers – CIPHE
- Electricians – Registered Competent Person Scheme, NICEIC
- Heating Engineers – APHC
- Glaziers – Glass and Glazing Federation (GGF)
Get Pricing on Garage Conversions Near You
We’ve done our best to give you a good idea of what you can expect to pay for converting a garage.
However, our guides are not a substitute for a fixed quote specifically for you.
We work with all the best garage converters ready to price your job. Get free, no-obligation quotes in your local area and compare prices using the form below.
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