The check runs in two steps: find your area using the search on this page, then match the works you have in mind against England's national permitted development rules as at 21 October 2026. Under article 2(3) of the GPDO 2015, a conservation area counts as “article 2(3) land”, and some permitted development rights are curtailed there. Curtailed selectively: anything that changes how the house looks from the street usually needs planning permission, while work inside and at the back most often goes ahead without an application. The practical takeaway for insulation and heating: loft insulation, internal wall insulation, panels on a roof slope and a heat pump in the garden go in freely on a typical house; external wall insulation and a pump on the road-facing front do not. Three things break this pattern: an Article 4 direction, a listed building, and a flat instead of a house.
Contents
- How to find out whether a house is in a conservation area
- Solar panels: roof slope, façade and flat roof
- Heat pump: garden and side wall
- Insulation: inside without formalities, outside with permission
- Windows and doors: like-for-like replacements are fine unless there is an Article 4 direction
- Article 4 directions, listed buildings and flats: when the “no permission” rules stop applying
- Which homes are in conservation areas
- A worked example: a Victorian terraced house without an Article 4 direction
- Frequently asked questions
- Glossary
- In short: what you can do without permission in a conservation area
How to find out whether a house is in a conservation area
The area search on this page works by council or name and takes you to the area's page: the boundary (as at 3 November 2026), any Article 4 directions found and homes with an Energy Performance Certificate (EPC). Every one of the 6,655 areas with at least 30 such homes has its own page. Areas within one council are grouped together, for example under Brent, Camden, Islington or Bristol. If the house sits right on the boundary, the council's map or its conservation area appraisal settles it: the council fixes the boundaries, the site only shows them.
The table “What needs planning permission in a conservation area” above the article describes a house without an Article 4 direction. Read it alongside your area's page: if an Article 4 direction is listed there, some of the “no permission” rows no longer apply to your house.
Solar panels: roof slope, façade and flat roof
Panels on a roof slope can be installed without permission provided they project no more than 0.2 m and sit no higher than the ridge (Part 14 Class A, A.2(c)). On a wall, balcony or roof parapet facing a highway, permission is needed in a conservation area (A.2(e)). A flat roof allows panels up to 0.6 m above the roof surface, but the council signs off their appearance first: that is prior approval, a narrower procedure than a full application. If the area has an Article 4 direction covering panels, or the building is listed, you will need permission even for the slope.
Heat pump: garden and side wall
An air source heat pump at the back or side of the house can be installed without permission under Part 14 Class G, provided the outdoor unit is no bigger than 1.5 m³, the installation meets the MCS Planning Standards and there is just one pump on the house (two on a detached house). A unit on a wall or roof facing a highway, or closer to the highway than the house itself, needs permission (G.1(j)). In practice that means choosing the spot for the unit before you talk to an installer: the same unit on the rear façade needs no application if the conditions are met.
Insulation: inside without formalities, outside with permission
Internal wall insulation, loft insulation and cavity wall insulation do not count as development, so they need no planning permission. External wall insulation changes the façade with render, cladding, timber or tiles, and in a conservation area it needs permission (Part 1 Class A, A.2(a)).
For older streets this is the central question. According to the EPC register for November 2026, 48.7% of certified homes in conservation areas have solid walls with no cavity and no insulation. There is nothing to fill in such a wall, so the choice comes down to an internal layer, which eats into room space, or an application for external insulation.
Windows and doors: like-for-like replacements are fine unless there is an Article 4 direction
Replacing windows and doors with like-for-like ones falls under permitted development for a house (Part 1 Class A, A.3(a)), unless the rights have been removed. Double glazing in a frame of the original pattern qualifies; secondary glazing is fitted from inside and leaves the façade untouched. Windows and doors are what councils most often take away with an Article 4 direction, so check your area's page before ordering. There is plenty to do: 15.1% of certified homes in conservation areas still have single glazing.
Article 4 directions, listed buildings and flats: when the “no permission” rules stop applying
| Case | What changes | What you will need |
|---|---|---|
| Article 4 direction | the council removes permitted development rights, most often for windows, doors and panels on the façade | planning permission for the works the Article 4 direction covers |
| Listed building | panels and heat pumps are not covered by permitted development at all | listed building consent |
| Flat in a block of flats | householder rights do not cover these alterations | heat pumps and solar panels follow their own, narrower rules for flats |
There is a catch with Article 4 data. Of 306 councils with conservation areas, only 116 publish their Article 4 areas on planning.data.gov.uk. The site found an Article 4 direction removing rights for 431 areas with their own page. The remaining pages state either what was found or that the council does not publish such data, and in the second case the absence of a direction on the site proves nothing.
Which homes are in conservation areas
England's conservation areas contain 1,931,175 homes with an EPC (register as at November 2026, latest certificate per house). 66.4% of them run on a gas boiler, 1.5% have a heat pump, and 13.4% have no loft or roof insulation. How the EPC band relates to the price of a house is covered on the EPC bands from A to G page.
Mapesbury in Brent shows the extreme case: 1,591 homes with certificates, 78.6% solid walls without insulation and 15 heat pumps. The council's Article 4 direction removes rights there for solar panels on the house, window and door replacement and other alterations, so even panels on a roof slope need permission.
A worked example: a Victorian terraced house without an Article 4 direction
The owner of a Victorian terraced house in an area without an Article 4 direction wants to cut the gas bill. They put panels on the rear slope, the pump in the garden and insulation in the loft: none of that needs an application provided the sizes and MCS standards are met. The street façade is solid brick, so they insulate it from the inside, because an external layer would need permission. Result: the house is insulated and switched from boiler to heat pump without a single application to the council.
Frequently asked questions
What can't you do to your house in a conservation area?
Without permission you cannot insulate walls externally, mount a pump on a wall or roof facing the highway, or put panels on a wall, balcony or roof parapet facing the highway. If the area has an Article 4 direction, add whatever works it removes rights for.
Do I need permission to cut a tree in a conservation area?
No permission is needed, but the council must be notified 6 weeks before the work (a section 211 notice). Trees with a trunk no more than 75 mm in diameter at a height of 1.5 m are exempt. Details are on GOV.UK.
Do these rules apply in Wales or Scotland?
No. The site shows England's national rules.
Do I also need building regulations approval?
The rules on the site do not cover building regulations; those are checked separately.
Glossary
Permitted development: works that, under the GPDO 2015 (Schedule 2, Parts 1 and 14), can be carried out without an application provided the conditions are met.
Article 4 direction: a council direction that removes permitted development rights for the works it lists.
Prior approval: sign-off by the council on specific aspects of a project, such as the appearance of panels on a flat roof.
Listed building consent: consent for works to a listed building; needed instead of permitted development.
Article 2(3) land: land where permitted development rights are curtailed, including conservation areas.
In short: what you can do without permission in a conservation area
- Without an application: loft insulation, cavity wall insulation, internal wall insulation, panels on a slope (projection up to 0.2 m, no higher than the ridge), a pump at the back or side (unit up to 1.5 m³, MCS, one per house), windows and doors of similar appearance.
- With appearance sign-off: panels on a flat roof up to 0.6 m.
- With permission: external wall insulation, a pump or panels on the road-facing façade.
- An Article 4 direction, a listed building or a flat changes everything listed above, so open your area's page first.
- The site's rules were taken as at 21 October 2026 and do not include building regulations. This is not a planning decision: if in doubt, ask the council.
The data sources are listed in the methodology.