February 17, 2025
Converting your garage is one of the most cost-effective ways to add valuable living space to your home. Whether you're looking to create a home office, gym, additional bedroom or living area, understanding the costs involved helps you plan your project effectively. This guide breaks down the costs for 2025, considering different garage types and all aspects of the conversion process.
The average garage conversion cost in 2025 ranges from £8,500 to £18,000, considering the 2024-2025 construction cost increases. An integral garage typically costs £8,500-£13,500, an attached garage £10,000-£15,500, and a detached garage £11,000-£18,000.
Architect fees now range from £500-£1,500 depending on project complexity. While not all conversions require an architect, architectural drawings may be necessary. A technician or draughtsman can often provide these services at a lower cost. Many building companies offer in-house architectural services as part of their package.
For larger conversions involving ground floor reconfiguration, an architect's expertise becomes invaluable. Projects including open-plan layouts or structural changes require a structural engineer to calculate beam specifications and obtain building control approval. This step is essential and reputable builders will insist on proper structural specifications.
The finishing touches transform your conversion into a stunning living space. While costs vary based on personal preference and material choices, careful consideration of finishes is crucial as these are the elements you'll see and use daily.
DIY enthusiasts might save money on finishing work, but precision is vital. Issues like squeaky flooring or poor expansion gaps can be constant reminders of rushed work. Professional installation often proves worthwhile for lasting quality.
A new internal door costs from £45, though matching existing doors may affect pricing. Solid wood doors cost more than hollow core alternatives but offer better quality. Fire doors (FD30) start from £150 when required by building regulations.
Professional decoration for a single garage starts from £600, with double garages around £1,100, including standard emulsion and gloss paint. Premium paint brands will increase costs accordingly.
Consider selling your old garage door, especially electric models which can fetch several hundred pounds on local marketplaces. Take on suitable DIY tasks like garage clearance or foundation digging if you're capable. Carefully plan electrical and plumbing layouts before work begins, as mid-project changes increase costs significantly.
Most conversions fall under permitted development rights, though always check with your local authority. Planning permission, if required, costs £270-£600, with building regulations approval ranging from £450-£900.
The costs provided in this guide are based on average UK prices for 2025. However, it's important to note that every garage conversion is unique, and actual costs can vary significantly. Factors such as your location, the garage's current condition, specific requirements, and chosen finishes all influence the final price.
Different builders may also price projects differently based on their expertise, team size, and approach to the work. Some might include services like architectural drawings or project management in their quote, while others price these separately.
We recommend getting at least three detailed quotes from different builders to compare:
When comparing quotes, consider factors beyond just price. Look at their past work, check reviews, ask for references, and ensure they have proper insurance and relevant certifications. The cheapest quote isn't always the best value, and the most expensive doesn't guarantee the highest quality.
For a free quote from our builders in Bolton, Wigan, Worsley and Warrington, get in touch with us by calling 07429 519982 and we'll be happy to help.
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