How much does a garage extension cost in 2026?

Garage extension cost guide

This guide goes through all the basics of a garage extension. A well-planned project is more than just extra space, it can improve everyday convenience and add attractive resale appeal when it’s time to sell.

We'll cover the following topics in this cost guide:

1. Average garage extension costs
2. Hiring a contractor for your garage extension
3. Choosing materials for your garage extension costs
4. Top cost-saving tips for garage extensions
5. Additional garage extension costs
6. Find a garage extension contractor near you on MyBuilder
7. FAQ: Common questions about extension architect costs

Average garage extension costs

A garage extension offers you a good way to get the extra space you need, without the disruption of a full house move or extension.

Whether you're creating a dedicated workshop, home gym, additional parking, or even a habitable living area, this extension can improve your day-to-day lifestyle in many ways!

The average cost of a garage extension typically ranges from £17,000 to £38,000 for a single garage, and £34,000 to £90,000 for a double garage.

Take a look at the average costs for different sizes here:

Aspect	Cost
Garage extension per m²	£1,250 – £3,000+
Single garage (total)	£17,000 – £38,000+
Double garage	£34,000 – £90,000+
Planning application fee	£60 – £250+
Building control fee	£170 – £690+
Party wall & engineer fees	£1,200 – £3,000+
Scaffolding	£1,800 – £4,000+
Waste removal per load	~£175+
Optional ensuite/bathroom	+£10,000+

Don't forget: To get the best price possible for your garage extension, just post your job on MyBuilder then connect with multiple verified extension contractors in your area. You can then discuss the job, get advice, request quotes etc.

Choosing materials for your garage extension costs

When you are planning a garage extension, the choice of materials plays a crucial role in determining overall costs.

Selecting materials is more than just picking the right style; it involves considering durability, availability, and the specific needs of your project. Materials can vary in price significantly, impacting your budget and the project's final outcome.

Take a look at the different materials for your garage extension and their costs:

Material	Cost per m²
Concrete	£40 - £75
Brick	£50 - £100
Steel	£80 - £150
Timber	£50 - £120
Composite materials	£70 - £130

MyBuilder-Tip: When picking materials for your garage extension, think beyond the upfront price. Choose ones that suit your local weather and need little upkeep to boost the build's value and longevity.

If you are unsure about what materials to select for a garage extension, it might help to talk to an architect in your area who can best advise you on what will work best. See this guide on architect fees here.

Top cost-saving tips for garage extensions

When you’re planning a garage extension, there’s some cost-saving strategies that can significantly reduce your expenses without compromising on the quality. Take a look at these tips for saving on your garage extension:

• Plan your extension in detail from the outset to avoid costly changes during construction.
• Choose cost-effective yet durable materials to maintain structural integrity at a lower cost.
• Opt for a straightforward design to minimise architectural fees and construction complexities.
• Schedule construction during off-peak times to potentially benefit from lower contractor rates. If you want to look at how garage extension costs compare to other extensions, take a look at this house extension cost guide.

Additional garage extension costs

When adding optional features to your garage extension, you get to personalise the space for your family's needs, but they do bump up the price. Knowing what's available helps you decide which extras truly pay off in everyday use and long-term value. Here’s some extra costs you might have to factor in:

• Insulation: Enhancing energy efficiency by adding insulation can add costs but often results in savings on heating and cooling. Take a look at insulation costs here.
• Plumbing: Installing plumbing for additional facilities like sinks or bathrooms can significantly increase the total price.
• Electric work: Incorporating advanced electrical systems, such as additional outlets or specialty lighting, can contribute to higher costs.
• Heating: Installing a heating system ensures year-round usability of the garage space, but it comes with added expenses.

Find a garage extension contractor near you on MyBuilder

Planning a garage extension and need a reliable contractor? Post your project on MyBuilder today! It’s a quick, easy way to connect with local tradespeople, compare quotes, read customer reviews, and hire the right professional to deliver your project.

FAQ: Common questions about garage extension costs

What are the differences in cost between a single-car and a two-car garage extension?

The cost difference between a single-car and a two-car garage extension is primarily due to the increase in materials and labour for the larger space. A two-car garage typically requires more extensive groundwork, a larger roof area, and possibly more complex planning and design work. The costs might increase by 50-75% more than a single-car extension, depending on the project specifics.

How does the choice of materials affect the cost of extending a garage?

Choosing different materials can substantially affect the cost. Brick, timber, and steel are common materials, but each come with different prices.

For instance, a brick extension is often more expensive due to its durability, but may offer better thermal efficiency to save you energy costs in the long run.

How do local building regulations and permits impact the overall cost of a garage extension?

Local building regulations and permits can significantly impact costs due to application fees, potential changes to designs, or mandated structural modifications to meet codes. Always check with your local authority for specific requirements to prevent fines or halted work.

Are there financial benefits, like increased property value, associated with a garage extension?

Yes, in addition to making your property more functional, a garage extension can increase property value by providing additional storage or parking space, which is especially beneficial in urban areas. A well-executed garage extension can yield a return on investment when selling the property, offering a financial advantage beyond the immediate utility.