How much does a garage conversion cost?

Price guide

£1,000 - £2,000







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How much does a garage conversion cost?

If you need more space in your home, converting your garage into a new room is an economical choice. After all, you get to skip the hassle and expense of building a house extension or buying a new home.

Various things can be done in garages. It can be converted into a new bedroom, an additional kitchen or bathroom, or an entertainment area. On average, garage conversion costs around £1,000 to £1,250 per square metre. This could go as high as £2,000 depending on the type of garage, the type of room it will be converted into, and a couple of other factors.

If you want to know more about the average cost of garage conversion and the top things you need to consider before starting a project, we have created a comprehensive price guide. This will help you save time in browsing through tons of pages while helping you understand the whys behind each service. Read on to learn more about garage conversion costs in the UK.

Factors that affect garage conversion costs

Numerous factors affect how much a garage conversion costs. The final costs can double depending on the type of garage you have, the type of room your garage will be converted into, and the adjustments, installation, and labour needed to complete the job. To help you understand these further, we discussed each of these points below.

Type of garage

The three most common types of garages are integral, attached, and detached. Integral garages are the cheapest type of garage to transform since the garage is already built within the house and needs lesser fixes and modifications. Integral garage conversion cost around £400 to £700 per m².

An attached garage is similar to an internal garage but is built on the side of a property and shares a wall with the main house. It costs around £750 to £1,000 per m² and is the most common type of garage. It is also the simplest type to renovate or convert.

On the other hand, a detached garage is more complicated than integral or attached and is the most expensive. Detached garage conversion costs around £1,000 to £1600 per m². Since this is a detached space, additional alterations might be needed before converting this into a liveable space. Depending on the type of room you want to convert it into, you might need additional plumbing, electrical lines, or walls.

Aside from these three, garages can also be classified depending on how many cars can be fitted inside. Single garages are those that can fit one car while double garages can fit multiple vehicles. Of course, single garages are often smaller and cheaper to convert.

A single garage conversion cost ranges from £6,000 to £20,000 in total. Double garage conversion cost around £12,000 to £50,000. Despite the higher costs, a double garage can be incredibly useful if you need more space in your home. You can also opt for a partial garage conversion wherein half of the garage is kept as is while the other half is transformed into a new room. It all depends on your needs and goals for your home.

Type of room to be converted into

You are free to choose whatever type of room your garage will be converted into depending on your needs:

  • Bedroom

  • Kitchen

  • Living room

  • Toilet and bath

  • Gym

  • Home office

  • Entertainment room

  • A granny flat or a studio

With this, the costs of converting your garage differ according to the type of room you would want to transform it into. Costs can quickly escalate when converting a space to a kitchen or bathroom. These types of rooms might need additional plumbing to get clean, flowing water in.

Converting the garage to a bathroom would need an additional £2,500 to £5,000 on top of average costs due to the installation of sinks and showers, in addition to plumbing. A kitchen would need around £10,000 to £20,000 to add to the average costs due to counter, cupboards, and sink fittings.

Don’t be fooled, though. Bedroom and living room costs could also go higher depending on the design, style, and finishing, especially if you hire a floor planner or designer. Keep these in mind while creating your budget.

Building and structure costs

The cost to convert a garage would also depend on the complexity of the project. This means checking the current state of your existing garage and taking note of the alterations needed in the doors and windows, flooring, ceiling, lighting and plumbing, to name a few. To give you more idea on the estimated costs per each fix, see below:

Home installation



Doors and windows

£600 to £1,500

Removal costs to be aligned


£1,200 to £1,500



£750 to £1,000



£1,000 to £4,000

Installation of new pipes





£1,500 to £3,000

£800 (underfloor heating)



£8 (downlight)

£40 to £65 (spotlight)

£22 (wall light)


Labour costs

Labour costs would depend on the services you wish to avail. On average, the daily rate for each tradesperson is:




£170 to £220

Kitchen fitter

£130 to £160


£150 to £200


£150 to £265


£100 to £150

Painter and decorator

£100 to £200


£150 to £200

Window fitter

£150 to £170

If you plan to get architectural advice or professional rendering services, design fees typically range from £700 to £2,500.

Benefits of garage conversion

Now that you’re familiar with the factors that affect costs, let’s discuss the benefits of garage conversion. Converting your garage creates more liveable space in your home while saving up on house extension costs. It also frees up space inside your home to avoid overcrowding while making more use of a ’junk room’. Lastly, it increases property value and can also help add more utilities to your home (entertainment room or mini office).

DIY vs hiring a professional

If you want to save up on costs and DIY some parts of your garage conversion project, prepare to do lots of heavy lifting, measuring, and planning. Each detail should be exact so as not to waste the resources needed. However, if you don’t have the luxury of time and energy and want to seek the help of professionals, there are numerous benefits to hiring them.

 First, they know various high-risk installations such as electrical wiring, plumbing, and heating mechanisms. Second, they have years of training in house remodelling and installation and can guarantee a quality output that can last decades of wear and tear. They are used to doing heavy lifting, materials sourcing, and waste disposal. Lastly, they are experts on the fire, safety, and building regulations that need to be followed, permits to be applied, and permissions required per area.

If you are ready to move forward with your garden conversion and remodelling project, then skip looking for garage conversion cost calculators online. Put up a task on our Airtasker and get personalised quotes from a host of tradesmen near your area. Your newly remodelled space is now within reach! 


How much does a garage conversion to a granny flat or studio cost?

Garage conversion to a granny flat costs around £15,000 to £45,000 but can go higher or lower depending on the size of the space, location (London costs are usually £10,000 higher than other places in the UK), and complexity of the project. Garage to studio conversion cost is similar to granny flats since these both fall into garage to loft remodelling.

Is hiring an architect required for garage conversion projects?

Having an architect to design your space will beautify it and increase its monetary value in case you plan to put the house up on the market. They can also help you in navigating through building permits and planning permissions if needed. However, this is not compulsory and will depend on your needs and goals for your home space.

Do I need a building permit or planning permission to remodel my garage?

Building regulations approval is needed in garage conversion projects. This ensures that the new space complies with regulations that ensure the safety of inhabitants and the surrounding area. The application includes submitting plans to building control, actual home inspection, and issuance of a certificate. In most cases, planning permissions are not needed in garage remodelling and conversions. This will only be required if you are in a listed building or conservation area, if you plan to extend beyond your premises, convert your place into a business space, or other existing restrictions in your area. However, it is best to double-check with your local authority.

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