A Complete Guide to Garage Conversions
Converting a garage into a usable living space is a popular choice for UK homeowners. Whether you want an extra bedroom, home office or playroom, a garage conversion can add both space and value to your home.
This guide explains the basics, including when planning permission is needed and what rules you must follow.
Do You Need Planning Permission?
What Is Permitted Development?
In many cases, planning permission is not required for a garage conversion. This is because it often falls under permitted development, as long as certain conditions are met.
Permitted development allows homeowners to make certain changes to their property without applying for planning permission. Garage conversions usually qualify, as long as you are not extending the building or making major changes to the outside.
When Permitted Development Applies
Your garage conversion is more likely to be permitted if:
The garage stays within its original size
The property is a single house (not a flat or maisonette)
The building is not listed
There are no restrictions in your property deeds
You are not in a conservation area, national park or similar protected location
External changes are minimal
If you plan to replace the garage door with a window or wall, this is usually acceptable, but it’s always best to check with your local council.
When Planning Permission Is Required
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When Planning Permission Is Required 〰️
You will usually need planning permission if:
You are making major changes to the outside of the house
The property is listed
Your deeds restrict garage conversions
You want to create a separate living unit, such as a self-contained annex
The conversion removes essential parking in an area with limited space
If planning permission is needed, you must apply through your local council. Decisions typically take around 8–10 weeks.
Building Regulations: Always Required
Even if planning permission is not needed, building regulations approval is always required. These rules make sure the new space is safe, comfortable and energy-efficient.
Key areas covered include:
Structure – walls, floors and ceilings must be strong enough
Fire safety – smoke alarms and safe escape routes are required
Insulation – garages must be upgraded to meet modern standards
Ventilation – especially important for bathrooms or kitchens
Damp protection – to prevent moisture problems
Electrics – all wiring must meet safety standards
Plumbing – any new water or drainage must comply with regulations
Inspections will take place during the build, and once complete, you’ll receive a completion certificate.
How Much Does a Garage Conversion Cost?
Garage conversions are one of the most affordable ways to add living space. Most projects cost between £3,000 and £20,000, depending on size, design and location. Costs may be higher if planning permission or plumbing work is needed.
How Solid Build Structural Can Help
At Solid Build Structural, we support homeowners through every stage of a garage conversion. We provide:
Architectural drawings
Planning applications (if required)
Building regulations drawings
Structural design and advice
Whether you’re creating a bedroom, office or living space, we help ensure your conversion is safe, compliant and well designed.
With the right planning and professional support, a garage conversion can be a smooth and rewarding upgrade to your home.
