Planning permission for a conservatory
A conservatory counts as an extension for planning, so it uses the same permitted development limits, but under building regulations it is often exempt, which sets it apart.
For planning purposes a conservatory is just another single-storey rear or side extension, so the familiar depth, height and coverage rules apply. Where it differs is building regulations, where a genuine conservatory can be exempt.
- Falls under the same permitted development extension limits (depth, height, coverage)
- Single-storey, to the rear or side within the allowed dimensions
- Counts toward the 'half the land around the original house' coverage rule, with any previous extensions
- Exceeding the permitted development extension limits, or over 100m² of new floor space
- Conservatories on flats, maisonettes and converted houses
- Homes in conservation areas, National Parks and other designated land
- Properties where permitted development rights have been removed
Don't forget building regs
A conservatory is exempt from building regulations only if it is at ground level, under 30m², separated from the house by external-quality doors, and has its own heating controls with fixed electrical work compliant. Lose any of those and it becomes a normal extension. We advise which side of the line your design sits.
We confirm whether your conservatory stays within permitted development and whether it keeps its building-regs exemption, so there are no surprises later. If it is closer to a full rear extension, we design and detail it as one. Get a price from the instant quote tool.
Frequently asked
Do conservatories need planning permission?
Only if they exceed the permitted development limits that apply to any extension: the same depth, height and coverage rules. Most modest conservatories are permitted development, but designated land and flats are exceptions.
Do conservatories need building regulations approval?
Often not. A ground-level conservatory under 30m², separated from the house by external-quality doors and with independent heating, is usually exempt. Remove the separating doors or exceed the size and it must comply like a normal extension.
Not sure where your project stands?
Checking whether you need planning permission is one of the first things we do: on the house, before any drawings. Tell us about your project and we'll confirm the route.