How Much Can I Extend My Garage Without Planning Permission?
How Much Can I Extend My Garage Without Planning Permission?
Extending a garage is a great way to create extra storage, workspace or parking space, but it is important to know whether planning permission is required. In many cases, garage extensions fall under permitted development rights, meaning they can be built without a planning application as long as they meet specific size and location restrictions.
Maximum Garage Extension Size Under Permitted Develpment
In the UK, you can extend a garage without planning permission if the extension meets permitted development criteria. The garage extension must not be taller than 4 metres if it has a pitched roof or 3 metres if it has a flat roof. If the extension is within 2 metres of a boundary, the maximum height cannot exceed 2.5 metres. The new structure must not cover more than half the land surrounding the original house, and it cannot extend beyond the front elevation of the property.
For side extensions, the width of the extension must not be more than half the width of the original house. For rear extensions, the garage can be extended by up to 3 metres for terraced or semi-detached houses and up to 4 metres for detached houses without requiring planning permission.
When Planning Permission is Required for a Garage Extension
Planning permission is needed if the extension exceeds the size limits set under permitted development. If the garage is being extended to create a separate living space, such as an annexe or self-contained accommodation, planning approval is usually required. Homes located in conservation areas, national parks or listed buildings may have additional restrictions, meaning any extension must go through the planning process.
Building Regultions for Garage Extensions
Even if planning permission is not required, a garage extension must comply with building regulations if it exceeds 30 square metres or is attached to the main house. Regulations apply to structural integrity, insulation, ventilation, fire safety and drainage. If plumbing or electrical work is added, it must also meet UK building standards. Checking with the local planning authority before starting ensures compliance with all legal requirements.
Final Considerations
Even if planning permission is not required, a garage extension must comply with building regulations if it exceeds 30 square metres or is attached to the main house. Regulations apply to structural integrity, insulation, ventilation, fire safety and drainage. If plumbing or electrical work is added, it must also meet UK building standards. Checking with the local planning authority before starting ensures compliance with all legal requirements.