A garage conversion is an amazing way to add valuable living space to your home without the expense and disruption of a full extension.
Whether you're looking to create an extra bedroom, a home office, a gym, or even a rental unit, transforming your garage can be a cost-effective solution.
But the all-important question is: how much does a garage conversion cost?
The answer depends on lots of various factors, including the size of the garage, the type of conversion, the level of work required and more.
It should be noted that every garage conversion is bespoke and therefore will be quoted to bespoke requirements. It’s always advisable to get in touch for a free consultation for an accurate quotation.
In this blog, we will explore the key factors regarding the cost of a garage conversion including:
Average cost of a garage conversion
Factors affecting the garage conversion costs
Building regulations and planning permission
Professional fees
How to save money
Looking to arrange a FREE consultation for a garage conversion in the Forest of Dean, Cheltenham, Newport, Bristol, or the surrounding areas?
Call 01594 240 021 or use the contact form and we’ll be in touch promptly.
Average Cost of a Garage Conversion
As the average in the UK, you could be looking between the regions of £7,000 and £20,000 for a quality garage conversion. However, this price can vary significantly based on the specifics of the project.
Here is a rough guide of estimates based on the type of conversion:
Basic garage conversion (e.g. turning it into a simple room with insulation and flooring): £7,000 - £10,000.
Mid-range conversion (e.g. adding plumbing, heating, and electrical work for a home office or bedroom): £12,000 - £18,000.
High-end conversion (e.g. turning it into a self-contained living space with a kitchen and bathroom): £20,000+.
These figures are just general estimates, and the final cost will depend on several influencing factors. It is so important to make sure you speak to your contractor openly and honestly from the beginning to ensure the design is correct and no expensive additions are made along the way.
Factors Affecting Garage Conversion Costs
1. Type of Garage
Single Garage – Converting a single garage is typically more cost-effective ranging from £7,000 to £15,000, roughly as there is less space to work on.
Double Garage – A double garage conversion can cost between £15,000 and £25,000, depending on whether you’re converting the entire space.
Built In Garages – Since some garages are already part of the main structure of your home, it may be cheaper to convert than a detached garage.
Detached Garage – A detached garage conversion can be more expensive due to additional work required for insulation, plumbing & modifications.
2. Structural Work
If the garage is in good condition, the cost of structural modifications will be minimal. However, if the garage requires reinforcement, new walls, or roofing work, expect to pay more. Key structural costs include:
Insulating walls, floors, and ceilings: £1,000 - £2,500
Installing new windows or doors: £1,500 - £3,500
Replacing or reinforcing the roof: £2,000 - £5,000
Removing the garage door and replacing it with wall or window: £1,000 - £3,000
3. Plumbing and Electrical Work
If your garage conversion includes a kitchen, bathroom, or utility area, plumbing will add to the overall cost.
Running new plumbing connections can cost between £1,500 and £4,000. Electrical work, including new sockets, lighting, and heating, can range from £500 to £2,500, though these prices may vary between areas of the UK and contractors.
4. Heating and Ventilation
To make the new space comfortable, you may need to extend your central heating or install electric radiators. The cost of adding a radiator is around £300 - £800, while underfloor heating can range from £1,500 - £3,000. Proper ventilation, such as extractor fans in kitchens or bathrooms, will also add to costs. Be sure to ask your garage conversion contractor about these things.
5. Flooring and Interior Finishing
Once the structural and essential work is complete, finishing the interior may involve costs for the following:
Flooring: £600 - £2,500 (depending on materials like laminate, carpet, or tiles)
Plastering and decorating: £1,000 - £2,500
Furniture and fittings: varies depending on usage and quality of furniture.
Additional Garage Conversion Costs to Consider
Building Regulations & Planning Permission
Many garage conversions fall under permitted development rights, meaning you don’t need planning permission unless you're making significant external changes.
However, you’ll still need to comply with building regulations, covering insulation, fire safety, electrics, and ventilation. Expect to pay around £300 - £850 for building regulation approval. These fees may be different in reality as it depends on what you’re trying to achieve from your garage conversion.
Professional Fees
Hiring professionals can add to the cost, but ensures high-quality work and compliance with regulations. Estimated professional fees might include:
Architectural drawings: £500 - £2,000
Structural engineer (if required): £400 - £1,500
Labour costs (builders, electricians, plumbers): Varies depending on complexity
Is a Garage Conversion Worth It?
In summary, yes a garage conversion is absolutely worth it. You can add value to your overall home, you can make it look even better and add all important functionality. Get that new office space, bedroom, kitchen, gym or your chosen type of room with a well planned and executed strategy from Severn.
Contact Severn Garage Door Services Today
We hope we’ve provided a lot of information here, on some of the costs involved in taking on a garage conversion. We are very experienced in this field and would be honoured to support you with yours.
Severn provides FREE consultations and no-obligation quotations. Call our friendly and professional team today at 01594 240 021 or use the contact form.
We provide garage conversions in the Forest of Dean, Bristol, Cheltenham, Gloucester, Newport, and the surrounding areas.