Garage Conversion Cost Calculator

Looking to find out how much it costs to convert a garage into a room?

This garage conversion cost calculator is a fast and hassle-free way to instantly find out what a garage-to-room conversion costs in 2025.

With just a few basic details (no sign-up required), you’ll have a better idea of what you can expect to be quoted by garage conversion specialists near you. (Our estimates include approximate materials and installations costs.)

Scroll down to find our cost calculator. In a few clicks, you’ll have a much better understanding of what a garage conversion costs in the UK — so you can start planning your project today.

Garage Conversion Calculator

Keep in mind that this garage conversion cost calculator is only intended to give you a rough estimate of what it costs to convert a single, double, or triple garage into liveable space.

Looking to get an exact quote? Save time and let us connect you with garage conversions experts near you.

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How to Use This Garage Conversion Calculator

With only a few basic details, this garage conversion cost calculator will give you a general idea of how much you need to put aside for this type of job.

In the subsections below, you’ll find a little bit more information on what impacts the cost of converting garages. This’ll help you understand the estimates calculated by our tool.

Size and Type of Garage

The two first questions cover the approximate size of your garage space and whether it’s built into your home, attached to the side of it, or completely detached.

Size of Garage

The larger the type of garage you have, the more materials and labour that’s required to convert it into a liveable space.

Single garage conversions tend to cost the least, as there’s less required to make it work. On the flip side, double or triple garage conversions introduce challenges that you can sidestep when converting a smaller garage — like extending the heating system, as well adding electrics or plumbing.

Type of Garage

Another significant factor that impacts garage conversion calculations is the type of garage you have.

Integral garage conversions cost the least. This is because they’re built into the property and will typically require fewer materials and less work to transform into a liveable space.

But if you have a standalone garage that’s completed detached from your home (no shared walls), then there are a number of additional steps required to convert it.

At the minimum, you’ll likely need more electrical wiring to be laid between the garage and your property. But you may need more significant structural work to make it safe to use as liveable space.

Quality of Materials

Next up, you need to consider the quality of materials you want to use when converting your garage.

Midrange materials are the most popular choice among UK homeowners. At this level, things remain affordable without compromising the function and quality of the garage conversion. (If you’re unsure what to go with at this stage, stick with this.)

Using budget materials cuts down the upfront cost you need to budget for, but you will be compromising the quality and have higher maintenance costs. At the other end of the scale, premium materials provide you with a high-end finish that will last longer and need less maintenance — but you’ll need to put aside a bigger budget for the job.

Purpose of the Conversion

The type of room that you’re looking to convert your garage into will impact the prices that our garage conversion cost calculator estimates.

The most significant factor is if you want the garage conversion to include a new kitchen, new bathroom, or both of them.

Both of these additions require an extensive amount of extra work and additional materials that aren’t required if you’re only thinking of turning your garage into an office or spare or extra living room.

What About Half Garage Conversions?

We don’t include half garage conversions cost calculations in our tool.

However, you can get an approximate cost for this by calculating the square metres that you want to convert, selecting the closest option in our garage conversion calculator, and then cutting 50% from the estimate.

It’s a bit more complicated than this, but a half garage conversion typically costs less than a standard garage conversion as a few costly tasks aren’t required (e.g., the cost to brick up the garage door and install windows).

Why Do We Include Garage Conversion Labour Costs?

Most homeowners choose to hire tradespeople to convert their garages into liveable spaces.

Here’s why:

• Get a higher quality result. Garage conversion specialists know how to avoid common DIY issues and meet all the necessary building standards.
• Save yourself the hassle. There’s a lot that needs to be done to convert a garage into a liveable space — from structural adjustments to adding new wiring. There’s more involved than it might seem.
• Access expert advice. Not every project is exactly the same. Hiring someone who specialises in garage conversions helps you turn your ideas into something that works the way you need it to.
• Get peace of mind. Most garage conversion specialists offer a work guarantee. This means that if something isn’t spot on, they’ll figure it out without you paying extra.

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