How much does a garage conversion cost?

Rustic garage bedroom conversion Credit @ Mark Lewis

Sean Payne

Architect & Writer

Working on projects across the UK, focusing on energy efficient construction and renovations


Are you fed up with that cluttered, underutilised garage space just sitting outside your house, barely serving a purpose?

You're not alone.

Countless homeowners across the UK are facing the same dilemma as you: how to make the most of their unused garages without breaking the bank.

Imagine having an extra bedroom, home office, or even a gym, right there in your garage. Sounds great, doesn't it?

But here's the catch – garage conversions cost loads of money! Right?

Actually, they don’t. At least they don’t have to.

In this article, I'll show you that your dream of converting your garage into a vast, shoe-stuffed, walk-in wardrobe (Yes, please!) is possible.

I’ll guide you through the financial aspects of garage conversions in the UK, addressing your concerns and providing actionable tips to transform that drab garage into the home cinema you always knew you deserved.

So, what are you waiting for? Keep reading to unlock the true potential of your garage and make the best decision for your home and budget. You won't be disappointed!


Furniture fit out for a garage

Garage fit out with storage and office furniture Credit @ IKEA

How do you calculate a garage conversion cost?

Calculating costs for small projects is easier in some ways and harder in others. With an existing garage shell, there’s normally less to do. However, it’s always important to look out for:

  • The condition of the existing garage roof, particularly the structure.

  • The size of the garage and whether it’s large enough for your plans.

  • What will the garage be used for? e.g. bedroom, office etc.

  • Any features you are planning to add, such as windows, roof lights and doors.

These factors can vary the cost significantly, so we’ll cover some examples below.


Bright Garage Conversion with rooflight

Even a narrow garage can provide a great office space Credit @ Architect Your Home

Garage Conversion 1 - Office

A garage-to-office conversion can be an extremely affordable option with a budget of £7,000 to £12,000 and can be much less if you are resourceful and partake in some DIY. This assumes a number of specifics, however, such as:

  • The garage structure does not require repairs.

  • Moderate interior fit-out.

  • A garage size of roughly 16m2 (approximately £440 - 750 per m2)


Gym garage conversion

Other uses such as a gym or games room can also be a fantastic addition to your home Credit @ Bell & Higgins

Garage conversion 2 - Bedroom

Garages can be a fantastic opportunity to provide an extra bedroom to your property as long as you are aware of the planning permission requirements.

Bedrooms will normally come in at a higher bracket of £18,000 - £28,000 assuming the following:

  • The existing walls, roof and floor are structurally sound

  • Insulation can be built up on the inside easily.

  • The garage door will need to be replaced, and appropriate windows and doors added.

  • A garage size of roughly 16m2 (approximately £1125 - £1750 per m2)


Annex Garage conversion

An annex space with room for a dining table, a bedroom and a sofa Credit @ Marraum Architects

Garage conversion 3 - Annex Space

If you have a larger garage and looking to create more than just a single room, a fully-fledged annexe space could be for you. These can range anywhere from £28,000 upwards depending on how much you include in the project, this can include:

  • Garage extensions to create more space.

  • Rooflights and glazed doors.

  • Plumbed spaces such as kitchens and bathrooms

  • Prices per m2 from £1750 per m2 upwards.


First floor living space garage conversion

If your garage has enough headheight, a first floor may be possible Credit @ Kelly + Co Design

What can I do to reduce my garage conversion costs?

Construction projects in the UK are not cheap at the moment, but you can still achieve your garage conversion on a low budget if you are resourceful. You can save money by:

  • Planning ahead and designing in detail.

  • Keep any existing parts of the garage which may inform the new use.

  • Carry out as much of the work as you can yourself.


Modern office style garage conversion

Garages can be opened up to the garden with glazing Credit @ Ryan Leidner Architecture

Important factors with the cost of your project

As with many items in the UK, prices are rising. This means it’s more important than ever to be conscious of anything that can affect a builder’s quotation of the price of materials.

When preparing for a garage conversion, consider the following when planning your budget:

  • Location - London and the southeast are often more expensive.

  • Builder demand - builders with plenty of work may have long lead in times and will often quote higher, shopping around for the right builder at a reasonable cost will save you money.

  • DIY - with everything else considered, carrying out some or all of the work yourself is a fantastic way to save the most money.


Convert your garage without breaking the bank

In conclusion, garage conversions are a fantastic way to make the most of that dilapidated garage leaning up against your house and add value to your home. With careful planning and consideration of various factors, you can create the extra room you've always wanted without having your bank manager give you a call to ask where all your money’s gone.

To recap, here are the key points covered in this article:

  • Calculate garage conversion costs by considering the garage's condition, size, intended use, and any additional features you plan to add.

  • Garage-to-office conversions can be affordable, ranging from £7,000 to £12,000.

  • Bedroom conversions typically cost between £18,000 and £28,000, depending on the garage's condition and necessary modifications.

  • Annexe spaces, which include extensions and additional amenities, can start from £28,000 and go upwards, depending on the project scope.

  • To reduce garage conversion costs, plan ahead, retain existing garage elements, and perform some of the work yourself.

  • Consider factors such as location, builder demand, and the potential for DIY when budgeting for your garage conversion.

With these insights and tips, you're now equipped with the tools and knowledge you need to transform your garage into a valuable, functional, and fun space. So go ahead, unlock the true potential of your garage, and make the best decision for your home, your budget, and your life!

Let us help you convert your garage

I understand that it’s tiring staring at a wasted garage space, feeling overwhelmed by the clutter and the seemingly impossible task of turning it into something truly amazing.

The dream of turning your garage into a usable space seems, well, dim and distant, doesn’t it? There are so many pitfalls that litter the path towards your dream conversion.

Without proper guidance, you could end up making costly mistakes and turn your garage conversion project into a stressful, money-draining nightmare—scary stuff.

But it doesn’t have to be this way. With our help, your garage conversion can be a hassle-free, enjoyable experience.

Introducing our Free Fifi McGee Survivors Guide to Renovating – the ultimate resource for expert tips on converting your garage into your dream space, be it a gym, bedroom, or office, while staying on or even under budget!

By signing up for our Free Survivors Guide to Renovating, you'll gain access to:

  • Insider knowledge and advice from seasoned professionals who have been through it all.

  • Step-by-step guidance on planning and budgeting.

  • Guidance on choosing the right builder for your garage conversion.

So, what are you waiting for? Sign up for our Free Survivors Guide to Renovating now, and start your journey towards a successful garage conversion.