Planning Rules
Conservation Area Permitted Development: What You Can Build (2025)
Living in a conservation area restricts your permitted development rights significantly — particularly for external alterations visible from the street. Here’s a complete guide to what’s allowed.
⏱ 6 min read📅 Updated June 2025🏠 England only
Quick Answer
Side extensions, cladding and highway-facing dormers require planning permission
Conservation areas carry specific restrictions on permitted development rights — mainly focused on changes that are visible from the street and could harm the character of the area. The key restrictions in conservation areas are: side extensions require planning permission; cladding the exterior requires planning permission; roof extensions that would be visible from the highway require planning permission; and the larger home extension Prior Approval scheme doesn’t apply. Many conservation areas also have Article 4 Directions that go further, removing PD rights for things like replacing windows, changing doors, or installing satellite dishes.
What Is a Conservation Area?
A conservation area is an area of special architectural or historic interest whose character and appearance it is desirable to preserve or enhance — designated by the local planning authority under Section 69 of the Planning (Listed Buildings and Conservation Areas) Act 1990. There are around 10,000 conservation areas in England.
Conservation areas can be large (town centres, historic suburbs) or small (a single street or group of buildings). They are typically designated because of the quality of the architecture, the historic street patterns, or the collective character of the buildings — not necessarily because every individual building is significant.
PD Restrictions in Conservation Areas
| PD Right |
Conservation Area Restriction |
| Side extensions (Part 1 Class A) |
Not permitted development — planning permission required |
| Exterior cladding (Part 1 Class A) |
Not permitted development — planning permission required |
| Roof extensions visible from highway (Part 1 Class B) |
Not permitted development — rear dormers are PD; front-facing dormers and hip-to-gable are not |
| Larger Home Extension (Prior Approval up to 8m/6m) |
Does not apply in conservation areas |
| Outbuildings forward of principal elevation (Part 1 Class E) |
Not permitted if between the house and the highway in a conservation area |
What Is Still Permitted Development
Despite the restrictions, many works remain permitted development in conservation areas:
- Rear extensions: Single-storey rear extensions up to 4m/3m remain PD (subject to normal conditions)
- Rear dormers: Loft conversions via rear dormers are still PD — it’s dormers visible from the highway that aren’t PD in conservation areas
- Outbuildings: Garden buildings in the rear garden remain PD
- Solar panels: Solar panels remain PD but not on the principal elevation (facing the highway)
✅ It’s the visibility from the highway that matters most The conservation area restrictions on PD rights are largely focused on changes visible from the public highway. Works to the rear of the property that aren’t visible from the street are generally still PD. The aim is to protect the street scene character of the area, not to prevent all development.
Article 4 Directions in Conservation Areas
Many conservation areas have Article 4 Directions that go further than the baseline GPDO restrictions. These are made by the local council and specifically remove PD rights for works that would otherwise be permitted. Common Article 4 Directions in conservation areas remove PD rights for:
- Replacing windows (requiring planning permission to prevent uPVC replacing traditional timber)
- Replacing doors (preventing modern composite doors replacing period originals)
- Installing satellite dishes on front elevations
- Removing or altering chimneys
- Changing roof coverings or materials
- Installing rooflights on front slopes
Check whether your conservation area has an Article 4 Direction by contacting your council’s planning department or searching the council’s website. Article 4 Directions are often listed in the conservation area appraisal document. Note that Article 4 Directions must be specific — they must identify which PD rights are removed and from which properties.
Frequently Asked Questions
Can I extend my house in a conservation area without planning permission?
Yes — rear extensions within the normal permitted development size limits (up to 4m deep for detached houses, 3m for semi-detached and terraced) remain permitted development in conservation areas. Side extensions require planning permission in conservation areas. Check whether your conservation area has an Article 4 Direction that may further restrict PD rights — in some areas even rear extensions require planning permission.
Do I need planning permission to replace windows in a conservation area?
Replacing windows is not development (and therefore doesn’t need planning permission) unless an Article 4 Direction has removed the PD right for window replacement in your conservation area. Many conservation areas do have Article 4 Directions removing PD rights for window changes — these are specifically aimed at preventing uPVC windows replacing traditional timber. Check with your council whether an Article 4 Direction applies to your property. Even without an Article 4, if the building is listed, listed building consent is needed for window replacement.
Can I install solar panels in a conservation area?
Yes — solar panels are permitted development in conservation areas, subject to the restriction that they cannot be installed on a wall or roof slope that faces a highway. Panels on the rear roof slope are generally PD in conservation areas. Panels on the front roof slope (facing the street) require planning permission. In conservation areas, planning applications for front-facing solar panels are often refused because of the visual impact on the street scene.
How do I find out what Article 4 Directions apply to my property?
Contact your council’s planning department with your address and ask whether any Article 4 Directions apply. Many councils also publish Article 4 Direction information on their planning portals or in conservation area appraisal documents, which are typically available on the council website. You can also use the Planning Portal’s property search or the council’s interactive planning map — Article 4 Directions are sometimes shown as map layers.
More on Permitted Development Rights
Extensions, loft conversions, outbuildings, solar panels — our complete guide covers everything you can build without planning permission.
Read the Complete PD Guide →
