How much does it cost to do a garage conversion?

A garage conversion is one of the most cost-effective ways to add extra living space to your home without the expense of moving. Homeowners across the UK are increasingly wondering how much it costs to do a garage conversion, and whether it’s worth the investment.

In this guide, we break down typical costs, planning requirements, and whether converting your garage can add real value to your property.

How much does it really cost?

The answer depends on several key factors rather than a fixed price.

Every garage conversion is different. The overall cost will be influenced by the size of the garage, the condition of the existing structure, and how the new space will be used. A simple conversion to create a home office or playroom will usually cost less than a fully finished room with plumbing, heating, or bespoke features.

Factors that affect the cost include:

The size and layout of the garage
Whether structural alterations are required
Insulation, electrics and heating upgrades
Window and door replacements
The level of interior finish

One area that can significantly influence both comfort and long-term value is the quality of windows and doors. Replacing a garage door with a well-insulated window or a modern entrance door can transform the space, improve energy efficiency, and enhance kerb appeal.

For an accurate idea of costs, most homeowners benefit from a tailored quote based on their property and goals rather than a generic price range.

Does a garage conversion need planning permission?

In most cases, planning permission is not required, as garage conversions often fall under permitted development rights. However, there are exceptions.

You may need planning permission if:

Your property is listed or in a conservation area
The conversion changes the external appearance significantly
The garage is detached or part of a new-build with restrictions

Even if planning permission is not required, building regulations approval is always necessary. This ensures the space meets standards for insulation, fire safety, ventilation and structural integrity.

For official guidance, it’s always worth checking the UK Planning Portal.

Will a garage conversion add value?

A well-designed garage conversion is widely regarded as an attractive feature by buyers because it adds usable living space without reducing garden size. Creating an additional room, such as a home office, guest bedroom, or family snug, can make a property more appealing and functional.

The impact on value depends on several factors, including the quality of the conversion, how well it integrates with the rest of the home, and the expectations of buyers in your local area. Features such as good natural light, proper insulation, and a high standard of finish all play an important role.

Replacing an old garage door with modern, energy-efficient windows or a stylish entrance door can dramatically improve both appearance and comfort. High-quality installations from experienced specialists help ensure the conversion feels like a natural extension of the home rather than an afterthought.

Is a garage conversion right for your home?

A garage conversion is often faster and more affordable than a full extension, and it makes use of space you already have. When planned correctly, it can improve daily living, boost energy efficiency, and add long-term value.

To get the best results, it’s important to work with experienced professionals who understand local building standards and can supply high-quality windows and doors tailored to your project.

Get expert advice on your garage conversion

If you’re considering converting your garage and want to maximise comfort, style and value, RB Windows are here to help. From energy-efficient windows to secure doors that complement your home, our expert team can guide you every step of the way.