How Much Garage Conversion Cost

How much does a garage conversion cost?


Written by


Last updated Thursday 30th July 2020

Broken 1845592 1920

On average, when it comes to converting your garage, you can expect to pay between £11,000 - £25,000 for your everyday home.

However, like most conversions, each project is unique and costs can vary depending on the state of, and plans for, your garage. Here are just a few things you’ll need to consider beforehand…

Is a garage conversion right for you?

The first thing you should do, before parting with any of your cash, is to properly assess whether or not this is the right way to expand your home.

Garage conversions have loads of benefits. Not only are they easy on the old bank account, they’re also typically easier to acquire planning permission for. However, they do come at the expense of your garage (duh), and depending on where you live, this could be an issue. Whether or not you have a car, if parking is at a premium in your street, losing your garage could devalue your home.

You’ll also need to consider what room you plan on converting the space into. You could go for…

  • A family room
  • Kitchen extension
  • New bathroom
  • New bedroom
  • Home gym
  • Home cinema

The sky’s the limit!

Though not all of these rooms are created equal. Ground floor bedrooms and bathrooms typically bring in less value than their upstairs counterparts - just something to bear in mind if you plan on selling your home in the future.

Book a Free Architectural Advice Call

We offer free 30 minute consultations to help you with your project.
Select a date to view availability

Garage conversions: cost breakdown

Removing Garage Doors £1300 - £2000

Replacing your car hole with bricks and mortar is the most obvious job. To get a wall built, and window added, you’re going to have to factor in not only materials but hiring contractors too. You may even need a small foundation inserted, which a structural engineer can advise on.

New Doors and Windows £600 - £1500

To make your new room feel light and bright, you’ll probably want more than one window, and you might want to do up the access point. The price of these can fluctuate wildly, depending on whether you go for standard or bespoke.

Flooring £1000 - £1300

Most garages aren’t know for their nice floors, and in older properties, it can be particularly uneven. In order to make it fit for habitation, you’ll need to pour fresh concrete down before you can even think about carpets or hardwood floors.

Insulation £750 - £1000

In order to insulate your new room, and stop your heating bills from going wild, you’ll have to build stud walls inside your old garage. This allows for your roof, and the space between the old walls and new to be filled with insulating materials. There are many ways to insulate your home, all with different price tags, so research which one will be right for you.

Removing a wall £300 - £1200

If you’re opting to use your garage to expand your kitchen or dining area, you’ll have to remove the wall separating them. As you can see, the pricing can vary massively, depending on whether the wall you’re attempting to remove is a load bearing one - a structural engineer will be best placed to advise on this.

Utilities £1000 - £4000

If converting into either a bedroom or recreational space, you won’t have to do much in way of utilities. Most garages come with electrical wiring. However, if you’re converting into a bathroom, or working with a detached garage, that’s when costs can mount. You’ll have to install piping for water and gas, and the further your garage is from the main building, the more the price will increase.

Admin Costs £400 - £600

As most garage conversions happen within the existing structure, rather than actually expanding anything, you’re likely not to need planning permission. Instead, you should be covered by permitted development rights. You’ll still need to get approval from the council (which comes with a fee), and there could be more admin costs if the council doesn’t approve the work, or you need to arrange a party wall agreement with a neighbour.

Architect £700 - £2500

You might not need an architect for basic conversions, but if you’re looking to combine rooms, or design an annex, then getting an architect on board can help maximise your project’s potential. What’s more, they take care of the planning, making sure your admin costs don’t suffer from bad paperwork.

Building Regulations Application £500-1000

Building regulations are a set of standards that all properties must meet, based around design, construction, and alterations. Half of what you’ll pay will be for the application, and the other half for inspection costs. Prices will vary based on the scale of the work.

Factors that can affect your budget...

While we've tried to give you a rough idea on the average costs you'll face, there are some factors that can dramatically affect your budget.

  • The size of your conversion, the more square feet, the more budget you'll need.
  • Where you live in the UK (London professionals charge a premium).
  • Your property type - listed buildings cost more.
  • Whether or not specialist knowledge is required, such as timbre work.
  • The amount of glazing you want to install.
  • Quality of materials used.
  • Quality of professionals involved - a high-end architect can charge up to £10,000!

Want to know how much your conversion might cost? Book a free consultation with our team. We'll review your home and give budget estimates for your possible conversion options.

If you enjoyed this post, you might enjoy our Resi Newsletter, sent weekly via email. Sign up here

Looking to improve your home?

We offer free 30 minute consultations to help you with your project.
Select a date to view availability

Phone: +44203 868 9453 | Email:

Resi Design Ltd. trading as 'Resi' | Company No: 10471125

We are proud to employ architects registered with the Architects Registration Board and were awarded the mark for The Mayor's Good Work Standard for fair pay & conditions, wellbeing, skills, progression, diversity and recruitment.

Resi Finance Ltd is an appointed representative of Mortgage Advice Bureau Limited and Mortgage Advice Bureau (Derby) Limited who are authorised and regulated by the Financial Conduct Authority. Resi Finance Ltd. Registered Office: Kemp House, 160 City Road, London, United Kingdom, EC1V 2NX. Registered in England Number: 12327535