Do I Need Planning Permission for a Conservatory?
Usually NO
In most cases, NO — a conservatory is usually permitted development and does not need planning permission, provided it meets the size and position limits.
Keep reading for the full rules.
A conservatory is one of the most popular home improvements in the UK. The good news is that most conservatories qualify as permitted development (PD), meaning you do not need to apply for planning permission. However, there are size limits and exceptions — particularly if you live in a conservation area, national park, or listed building.
Permitted Development Rules by Region
Permitted Development Rules — England
- ✓The conservatory must not cover more than 50% of the land around the original house.
- ✓It must not project more than 3 metres beyond the rear wall of an attached house, or 4 metres for a detached house (under normal PD rights).
- ✓Under the Neighbour Consultation Scheme, you may build up to 6 metres (attached) or 8 metres (detached) depth — but must notify your council first.
- ✓It must not be higher than the eaves of the existing house.
- ✓It must not extend beyond the side elevation of the original house facing a highway.
- ✓Cladding and materials must match the existing house (or be similar in appearance).
Size & Position Limits (England)
| Requirement | Limit / Rule |
|---|---|
| Max depth (attached house) | 3m (6m with prior approval) |
| Max depth (detached house) | 4m (8m with prior approval) |
| Max height | No higher than eaves of the existing house |
| Max garden coverage | 50% of original garden area |
| Position | Must not extend beyond the principal elevation |
When Do You Need Planning Permission?
Even if your project is usually permitted development, planning permission is required in these circumstances:
- ✗You live in a conservation area and the conservatory extends beyond the rear wall of the original house.
- ✗Your property is a listed building — you will need listed building consent.
- ✗You are in a National Park, AONB, or World Heritage Site.
- ✗Your council has an Article 4 Direction that removes PD rights for your area.
- ✗Your property is a flat or maisonette — flats have no PD rights.
- ✗The conservatory exceeds the permitted size limits.
- ✗You have already used up your permitted development allowance with previous extensions.
What Happens If You Build Without Permission?
If you build a conservatory without permission when it is required, the council can issue an enforcement notice requiring you to demolish or modify it. The council has 4 years to take enforcement action for dwellinghouses. A retrospective planning application may resolve the issue.
Enforcement notices: Your council can issue an enforcement notice requiring you to stop the work, remove it, or restore the land to its original condition. You have a right of appeal against an enforcement notice.
Retrospective applications: If you have already carried out work that required planning permission, you can submit a retrospective planning application. If approved, this regularises the work. If refused, you may be required to remove it.
Time limits: For dwelling houses, the council generally has 4 years to take enforcement action for most types of work. For breaches of planning conditions, the time limit is 10 years. There is no time limit for listed building enforcement.