Guide
Do you need planning permission to convert a garage?
Usually not, if the work is internal and the building is not enlarged. But permitted development rights can be removed by a planning condition or an Article 4 Direction, which is more likely on newer estates, so check your property's planning history first. Building Regulations approval is needed for almost every garage conversion.
Updated 3 min readBy the Solubius team
A garage conversion is a common way to add a room without extending the house. The rules come in two separate parts, and people often mix them up: planning permission, which is about whether the change is allowed, and Building Regulations, which is about whether the work is safe, warm and properly built.
Planning permission: usually not needed
The Planning Portal says planning permission is "not usually required, providing the work is internal and does not involve enlarging the building". That covers the typical conversion of an attached or integral garage into a study, playroom or living space.
It is different if you want to turn the garage into a separate home. In that case, the Planning Portal says permission may be needed "no matter what work is involved".
When your usual rights have been removed
The rules above rely on permitted development rights. These can be taken away, and this is where some conversions around Wokingham need checking.
- Planning conditions. When a housing estate is approved, the council can attach conditions that remove some permitted development rights, for example to keep garages available for parking. The Planning Portal advises checking with the council first, "particularly if you live on a new housing development or in a conservation area".
- Article 4 Directions. A council can remove rights across a defined area. Wokingham Borough Council lists its Article 4 Directions on its website, among them areas at Monterey Roman Ride, Sandy Lane, Mill Lane in Sindlesham and Coombes Lane in Barkham. The list does not say which rights each one removes, so check the direction itself if your property is inside one.
- Listed buildings. Work to a listed building may need listed building consent, whatever the permitted development position.
How to check your own property
- Search Wokingham Borough Council's planning records for your address. The council says records from 1998 onwards can be searched online, and older records can be requested by email (a fee may apply).
- Read the original planning permission for the estate or house, and look for conditions about garages, parking or permitted development.
- If you are still unsure, you can apply for a lawful development certificate. The council describes this as optional, but it gives you written confirmation that the work is lawful, which helps when you come to sell.
Building Regulations: almost always needed
Once a garage becomes a room people live in, Building Regulations apply. The Planning Portal says a conversion to habitable space "will normally require approval", and LABC, which represents local authority building control, says a garage conversion "will always need a building regulations application".
The main points building control will look at:
- The new wall where the door was. The existing garage floor is often a shallow slab, so a new foundation may be needed for the infill wall.
- Damp. The new floor's damp-proof membrane has to join the damp-proof course in the existing walls.
- Insulation. Walls, floor and roof need to reach current energy standards, which a bare garage never does.
- Ventilation. Opening windows and background (trickle) ventilation are required.
- Fire escape. If the new room can only be reached through another room, it needs an escape window of at least 450 x 733mm, with its bottom no more than 1.1m above the floor.
- Doors, windows, drainage and electrics. These are covered too.
At the end, building control issues a completion certificate. You should keep it. Without it, gov.uk warns, you "will not have the certificates of compliance you may need when you want to sell your home".
How we approach a conversion
We start by asking for the address so the planning position can be checked before anything is designed. We then plan the internal work as one job: framing and insulation, plasterboard, flooring, doors, storage and decoration, with specialist trades brought in where the work needs them. We do not take on structural alterations beyond the scope of a standard conversion. If a design needs structural calculations, we say so early.
Sources
- Planning Portal: garage conversion, planning permission
- Planning Portal: garage conversion, Building Regulations
- LABC: garage conversion tips from building control
- Wokingham Borough Council: find out if you need planning permission
- Wokingham Borough Council: other plans and policies (Article 4 Directions)
- gov.uk: Building Regulations approval
Common questions
You can often do it without planning permission, but not without building control. Converting a garage into a habitable room needs Building Regulations approval, either through a building notice or full plans, and a completion certificate at the end. Skipping it leaves you without the paperwork buyers and their solicitors ask for when you sell.
Search Wokingham Borough Council's online planning records for your address and read the conditions on the original permission for the estate. Records from 1998 onwards are online. Older ones can be requested by email. If the position is still unclear, a lawful development certificate gives you written confirmation before work starts.
The Planning Portal treats internal conversions that do not enlarge the building as usually not needing permission, but it tells homeowners to check with the council first where rights may have been removed, especially on newer estates. The safest route is to check your property's planning history, or ask the council, before the door comes out.
Planning garage conversions work?
Send the address, a few photographs and what needs to change. We will tell you what applies to your property.