Complete our form and receive free quotes within minutes: Request FREE Quotes

How Much do Garage Conversions Cost?

garage conversion cost

Adding an extension to your home is the simplest way not only to increase the amount of space you have available, but also to increase the resale value of your house if you decide to sell it. The greater the amount of living space in a home, the greater its market value will be.

There are many ways to expand a house, but one of the easiest is a garage conversion. It's also one of the least expensive and most cost-effective ways of expanding a house. The costs of a garage conversion are relatively low, and should be more than compensated for by the increase in the house's value.



Although garages are intended to be used for storing cars, most people don't use them for that purpose, choosing instead to keep their cars in the drive, on the street or in a car park. In the absence of a car, the garage becomes a glorified storeroom, used to hold suitcases and old bicycles. This large unused space has excellent conversion potential. Double garages can be partially converted, creating both a new room and a single-car garage.

Garage conversions have several advantages over conservatories or other types of extensions. Most obviously, a garage already has foundations and standing walls, making some of the construction work involved in other types of extension unnecessary. Similarly, garages usually have their own electrical connections, which makes it easier to convert them to some types of room. As a result, garage conversions offer significant savings compared to extensions which have to be built from the ground up.

For instance, a new three-by-four metre extension could cost as much as £13,000 or more, making a garage conversion a very affordable alternative. The average British garage conversion costs between £4,995 and £7,000. Whether your garage conversion comes in at the bottom of the range or the top, however, depends on where you live as well as what alterations need to be made.


The first step in planning a garage conversion is choosing what kind of room the converted garage is going to be. Whatever kind of room it ends up being, it will probably require some modification. Compared to most rooms in a house, garages are typically very long in proportion to their width. In order to deal with this, garage conversions usually involve cutting off some of the space at the rear of the garage by adding a new stud wall part of the way down the length of the wall. It´s important to know that a garage already has a structure, has a foundation, walls, and is easy to transform it into a living space, such as a playroom, a den for teenagers or a separate room for grown-up children living at home, a home cinema, home office. The resulting space can be turned into a toilet or shower if the room is becoming a bedroom, or simply used as storage space in other cases. A new internal stud wall can cost up to £750, plus the cost of the doors. However, internal stud walls in garage conversions tend to be relatively inexpensive because of their short length.


For the most part, garage conversions won't require major structural changes, although windows or doors may need to be added in order to give the rooms the required amount of light or ventilation. If doors also need to be added, you may have to add reinforcements to the walls. The changes to the structure will be slight, but the more of them there need to be, the higher the cost of the conversion. Qualified professional contractors will be able to inform you of the legal requirements.

Some of the changes that may be required might include creating a new door to the house (aroud £5-600), replacing the old floor and laying a new slab (approximately £1000), and replacing the garage door with a new wall and window (around £1300). Alternatively, the door can simply be “masked” rather than replaced.

The size of the area to be converted will also make a difference in determining the cost of the garage conversion. The larger the garage, the greater the cost of the conversion will be. Materials costs include flooring, insulation and more. Again, the difference in cost is relatively slight, but it is one of the factors to consider. Double garage conversions are comparatively more expensive than single car garage conversions.

The height of the floor is another factor to take into consideration when planning a garage conversion. Some garages have lower floors than the attached house, meaning that the floor may have to be raised; alternatively, steps or a ramp can connect the two.


Adding new electrical sockets, water lines and other utilities can drive up the cost of a garage conversion. The number of these alterations that need to be made will depend on the type of room the garage is being converted into. A sitting room or bedroom will require only a few changes, while a new kitchen, toilet or shower will require more changes to the plumbing. The greater the number of changes to the garage's utility provision, the greater the cost of the conversion will be. Simply adding a new socket should cost less than £100, but a complete rewiring can be much more expensive.

Adding new water pipes or electrical outlets to a conversion can be one of the most expensive aspects of the process, especially if the existing power lines or pipes need to be moved or repaired. This process can cost £1,000 or more, up to £3,000 in some cases.


As with any home extension, labour and material costs are an important contributor to the overall cost of the project. While keeping costs to a minimum is obviously important, skimping on the needed materials or hiring unqualified contractors can mean a substandard job that will lower the overall value of the building and may need significant repairs. Using the right materials and qualified workers will pay off in the long run.


Average Cost of Garage Conversion – things to consider

Generally speaking the cost of a garage conversion depends on a number of factors that can change your garage into a wonderful place and it is difficult to say what the estimating cost is because each house is different and has a different project. The precise cost will be determined by the style of the actual conversion and the contractor that you use – so getting some good quotes is essential. For example, we can take in account the factors below to determinate the estimating costs:

  • The design of the interior
  • Create the plan for converting your garage
  • The size of the garage
  • Do you need a project manager?
  • Type of materials you purchase
  • The height of the existing floor

The average British garage conversion costs between £4,995 and £7,000. Whether your garage conversion comes in at the bottom of the range or the top, however, depends on what alterations need to be made. There are several different areas where different decisions can lead to different costs.


Just like any part of the home, garage conversions require lighting and heating. In order to keep the costs of this kind of structure to a minimum, make sure that the conversion is properly insulated, that the right windows are installed, and that light fixtures are fitted with energy-efficient lights. As long as the conversion is done in an energy-efficient way, the costs of operating a garage conversion won't be any different from the costs of running any other room in the house.


Whether you're adding a guest bedroom or creating a playroom for the children, the first step in a garage conversion is getting an estimate from a qualified tradesman. An experienced contractor can identify the main areas where work will be required, including whether structural adjustments will be required and what changes will be needed to the utilities. Your contractor will also be able to inform you about the options available to you in terms of materials for your conversion.


If you need more space but you don´t want to expense of moving house the best solution is converting your garage.

In nowadays, the best solution to save money and have more space is converting your garage and if you think that converting your garage can give you the possibility to create an apartment space to rent out for supplemental income you have found the answer to your problems.

Once you contact us to make an appointment we arrange to send you four home improvement companies to visit your home and to provide their best price to you based on your exact requirements.

Planning permission

It´s true that in most cases maybe you don´t need planning permission, but if you think it is we can see your options on this subject.

As reputable company our work is guaranteed to the highest quality and we offer all the solutions and our professional trades' people have been checked and verified.


Each project is managed by a member who holds current safety management qualifications.  We ensure that converting your garage will not cause danger to health and will not affect flues from heating appliances.


One of the most important benefits to getting a garage conversion is that it adds a different face to your home and is changing your storage unit. Your guests will seem attractive to see how you used the floor space, how you changed the walls, how you put all your imagination in this project.

Another benefit is that the value that gives the extra space and this is a big point if you´re looking to sell for sure this could be a great way to boost interest.

If you have a garage that you rarely utilize and if you want to see the conversion possibilities we can help you and for sure will this will provide you a bonus space for your home.

When you decide to convert your garage you have to see how much space you are going to need, you have to evaluate what has to be done in order to transform it in a habitable room.

Do you like this guide?