Conservation areas and listed buildings
Do you need permission to replace windows or doors in a conservation area or a listed building?
Short answer
It depends on which regime applies, and they are separate.
A house in a conservation area can usually replace its windows and doors without planning permission. Work that does not materially affect the external appearance is not development at all, and other replacements fall within Class A of the General Permitted Development Order 2015 if the materials are "of a similar appearance". The main exception is an article 4 direction, which a council can use in a conservation area to bring windows and doors under control. Flats have no Class A rights.
A listed building needs listed building consent for any alteration that affects its character as a building of special architectural or historic interest (section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990). Historic England's advice is that complete replacement of a historic window, sash or casement is always likely to need consent. Doing the work without consent is a criminal offence.
Building Regulations are a third, separate test, whatever the building's status.
Conservation areas: the planning position
Works that "do not materially affect the external appearance of the building" are not development (section 55(2)(a)(ii) of the Town and Country Planning Act 1990). A like-for-like replacement usually falls here.
Anything else is an "improvement or other alteration" under Class A. The government's technical guidance says Class A covers "general alterations such as new windows and doors". The condition that matters is paragraph A.3(a):
(a) the materials used in any exterior work (other than materials used in the construction of a conservatory) must be of a similar appearance to those used in the construction of the exterior of the existing dwellinghouse;
The technical guidance says it "may be appropriate" to replace windows with uPVC double glazing if the new windows "give a similar visual appearance", for example in overall shape and the colour and size of the frames. Being in a conservation area does not change that condition. Class A is not restricted for windows on article 2(3) land.
Two things do change it:
- An article 4 direction removing Class A, or part of it. Historic England gives replacing a door or window as an example of what directions in conservation areas restrict. Read the direction itself: it says which works it covers. See article 4 directions.
- A condition on an earlier permission for the house removing permitted development (article 3(4)).
A flat or maisonette has no Class A rights, in or out of a conservation area. Any replacement that materially affects the appearance of the building needs planning permission. See windows and doors for the general rules.
Listed buildings: listed building consent
Subject to the following provisions of this Act, no person shall execute or cause to be executed any works for the demolition of a listed building or for its alteration or extension in any manner which would affect its character as a building of special architectural or historic interest, unless the works are authorised under section 8.
Listing covers the whole building, inside and out, unless the list entry says otherwise. There is no fee for listed building consent, and the council has 8 weeks to decide. Planning permission is a separate question: for a listed house, Class A still applies unless removed, so consent may be the only application needed.
Historic England's Advice Note 16 (2021) sets out how the test usually falls for windows and doors:
| Work | Listed building consent | Advice Note 16 reference |
|---|---|---|
| Piecing in new timber to repair a rotten cill or rail, matching species and profile | Not usually needed | Note 8 |
| Renewing broken sash cords with the same material | Not usually needed | Note 8 |
| Replacing a broken pane of modern float glass | Not usually needed | Note 8 |
| Removing historic glass (crown, cylinder, early plate or drawn glass) | Needed | Note 8(i) |
| Complete replacement of a historic window, sash, casement or surround | Always likely to be needed | Note 8 |
| Replacing historic windows with double glazing | Ordinarily needed | Note 8 |
| Reversible secondary glazing that does not cut into frames, panelling or shutters | Not generally needed | Note 11 |
| Simple self-adhesive draught seals | Not usually needed | Notes 6 and 10 |
| Repairing a door by piecing in matching timber | Not usually needed | Note 4 |
| Stripping a door by dipping in caustic solution | Always needed | Note 4 |
| Replacing modern door furniture | Not usually needed | Note 5 |
Where you are unsure, the council can confirm in writing, or issue a certificate of lawfulness of proposed works under section 26H, which also has no fee. See listed building consent.
The offence
Contravening section 7 is an offence under section 9. On conviction on indictment the maximum is two years' imprisonment or a fine, or both, and the court must have regard to any financial benefit from the offence. There is no time limit on listed building enforcement. See buying a listed building with unauthorised works.
Building Regulations
Government guidance lists "replace windows and doors" among the alterations that might need Building Regulations approval, and says you do not need to get approval yourself if you use someone registered with a competent person scheme. The Regulations include flexibility for heritage buildings: the energy efficiency requirements do not apply to listed buildings, or buildings in a conservation area, "where compliance with the energy efficiency requirements would unacceptably alter their character or appearance" (regulation 21(3)(a)). The other requirements still apply.
Historic England guidance
For technical advice on repair, secondary glazing and upgrading, read Historic England's Traditional Windows: their care, repair and upgrading (2017, currently under review) and Advice Note 18 on energy and carbon efficiency (revised February 2026).
What this means for you
Establish the status first: listed, conservation area, article 4 direction, flat or house. The planning constraints checker covers the designations. For a listed building, survey the existing windows and doors before you specify replacements: consent usually turns on what is historic and what is not.
Sources
- Town and Country Planning Act 1990, section 55 legislation.gov.uk
- GPDO 2015, Schedule 2, Part 1, Class A legislation.gov.uk
- Permitted development rights for householders: technical guidance, September 2019 gov.uk
- Planning (Listed Buildings and Conservation Areas) Act 1990, sections 7 to 9 legislation.gov.uk
- Planning practice guidance: historic environment, paragraphs 043 and 044 gov.uk
- Historic England Advice Note 16: Listed Building Consent (2021) historicengland.org.uk
- Planning Portal: application fees in England from 1 April 2026 planningportal.co.uk
- Historic England: living in a conservation area historicengland.org.uk
- Building Regulations 2010, regulation 21 legislation.gov.uk
- GOV.UK: building regulations approval, when you need approval gov.uk