A well-executed garage conversion can add valuable living space to your home, increase its value, and create a fantastic new room. But before you dive into the project, understanding garage conversion costs is crucial. This guide will equip you with the knowledge needed to budget effectively for your dream conversion.

Price ranges for garage conversions

There's no one-size-fits-all answer to garage conversion price questions. The final cost hinges on several factors, but according to myjobquote.co.uk general ranges can consist of:

  • £7000 - £20,000 for a standard single garage conversion; and
  • £15,000 - £55,000 for a double garage conversion, depending on type (integral, attached, or detached).

Remember, these are just ballpark figures. Let's delve deeper into the factors that can influence your specific garage conversion cost.

Garage annex construction project
Garage annex project by FMB member G M Construction.

Garage conversion cost influencers

Garage conversion project
Garage conversion project by R Lange Construction Ltd.

Let’s decode the factors determining your garage conversion costs:

  • Size of your garage: As expected, a larger garage conversion will naturally cost more. A double garage conversion will require more materials, labour, and potentially structural modifications compared to a single one.
  • There are three main types of garages to consider:
    Integral garage: This garage is built into the main house and usually shares a wall. Conversions here are generally simpler and less expensive.
    Attached garage: Connected to the house but with an external wall. Adding plumbing and electrics might be needed, increasing the cost slightly.
    Detached garage: A standalone structure entirely separate from the house. This conversion is the most complex and expensive due to the need for additional groundwork and potentially running utilities like water and electricity.
  • The conversion's purpose: What room are you creating? A simple bedroom requires less work than a bathroom with complex plumbing needs. Adding features like insulation, soundproofing, or underfloor heating will also bump up the price tag.
  • The finishing touches: High-end fixtures, fittings, and materials will naturally cost more than budget-friendly options. Flooring, bathroom suites, and kitchen units all come in a variety of price ranges.
  • Location, location, location: Labour and material costs can vary depending on where you live in the UK. London and the South East tend to be more expensive than other regions.
  • Building regulations and planning permission: Always factor in potential costs associated with obtaining planning permission and adhering to building regulations. Consulting a building surveyor or architect can help navigate these processes.

Breaking down garage conversion costs

Here's a breakdown of some key cost components commonly found in garage conversion projects:

  • Building works: This covers the core construction elements like creating walls, installing insulation, laying flooring, and fitting windows and doors.
  • Electrics and plumbing: The extent of electrical work depends on the room's purpose. Plumbing costs will be higher for bathrooms and kitchens.
  • Heating: Adding radiators or underfloor heating will add to the bill.
  • Plastering and decoration: Skimming walls, painting, and adding finishing touches all factor in.
  • Building regulations and planning permission: Obtaining the necessary approvals can incur significant fees.
  • Project management: If you hire a project manager to oversee the conversion, this adds to the overall cost.

Find a Builder

Want three quotes for your project as soon as possible? Use our search to find vetted and inspected Master Builders in your area who specialise in conversions.


Budgeting like a pro: Tips for keeping your garage conversion on track

  • Get multiple quotes: Don't settle for the first quote you receive - compare prices and specifications from several reputable builders or construction companies.
  • Be specific in your brief: The clearer you are about your desired conversion, the more accurate quotes you'll receive from builders.
  • Factor in unexpected costs: It's wise to allocate a contingency fund for unforeseen issues that may arise during the project.
  • Consider DIY work: If you're handy, tackling some non-structural elements like painting or decorating can help save money. However, always prioritise safety and ensure any DIY electrical or plumbing work is completed by a qualified professional.

Beyond the bottom line: Additional considerations for your garage conversion

Garage conversion project by R Lange Construction Ltd
This Garage conversion project by R Lange Construction Ltd allowed for a lovely new kitchen space which definitely brought value to the home.
  • Adding value: A well-planned garage conversion can significantly increase the value of your property as much as 10-15% according to Virgin Money. Keep your potential return on investment (ROI) in mind when considering how much to spend on your garage conversion.
  • Planning permission and building regulations: Always check with your local council to see if planning permission is required for your specific conversion. Building regulations ensure the conversion meets safety and quality standards.

Maximising your investment: Smart strategies for a successful garage conversion

Garage conversion project by NMC NI Contracts Ltd
Garage conversion project delivered by NMC NI Contracts Ltd.

Having a firm grasp on garage conversion costs empowers you to plan effectively, but a successful conversion goes beyond just the budget. Here are some smart strategies to ensure your project runs smoothly and delivers the results you desire:

  • Choosing the right builder: Experience and qualifications are crucial. Look for builders registered with a reputable accreditation scheme like the Federation of Master Builders (FMB). References and checking previous work are also essential.
  • Open communication is key: Maintain clear and consistent communication with your builder throughout the project. Discuss any concerns or changes promptly to avoid delays or misunderstandings.
  • The power of planning: Having a detailed plan in place is vital. This includes architectural drawings, specifications outlining materials and finishes, and a realistic timeframe for completion.
  • Embrace the unexpected: While planning is key, unforeseen circumstances can arise. Be prepared for minor delays and adjust your budget accordingly if necessary.
  • Building a sustainable future: Consider incorporating energy-efficient features like insulation, double glazing, and LED lighting during your conversion. While these may add to the initial cost, they can save you money on energy bills in the long run.

FAQ: Addressing common garage conversion concerns

Q: How long will a garage conversion take?

A: The timeframe depends on the size and complexity of the project. Admiral indicates that a typical conversion can take anywhere from one to four weeks.

Q: Do I need an architect for my garage conversion?

A: An architect isn't always mandatory, but they can be invaluable, especially for complex conversions or those requiring planning permission.

Q: Can I convert my garage myself?

A: For some with significant building experience, some DIY elements might be possible. However, crucial elements like structural work, electrics, and plumbing should always be completed by qualified professionals to ensure safety and compliance with applicable regulations.

Q: Will I need planning permission?

A: In most cases, no, but all circumstances are different. Read up on the subject with our ultimate guide to planning permission, find out what's achieveable under permitted development rules and if your garage shares a wall with your neighbour, take a look at our guide to party wall agreements and make sure you're taking steps to avoid costly disputes.

Q: What happens if I discover asbestos during the conversion?

A: Asbestos is a hazardous material, if you suspect its presence, halt work immediately and seek professional help for removal and disposal.

Remember…

By understanding garage conversion costs, the influencing factors, and the conversion process, you're well on your way to achieving a successful and rewarding project. 

A well-executed garage conversion can add valuable living space, enhance your home's functionality, and potentially increase its value.

Ready to start your garage conversion project?

Find a Builder

Want three quotes for your project as soon as possible? Use our search to find vetted and inspected Master Builders in your area who specialise in conversions.