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Do I need Building Regulations approval to replace windows or doors?

Building Regulations usually apply to replacement windows and doors, though most installers self-certify compliance instead of needing council approval.

AB-01The short answerYes, in most cases. Replacing windows or doors in England is covered by Building Regulations, mainly for energy efficiency and safety glazing. Most double glazing and door companies avoid a separate council application by self-certifying the work through a competent person scheme.
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Building Regulations apply to most window and door replacements in England, even if no planning permission is needed.

AB-02Check which part of the UK you're inThis guide covers England first. Wales, Scotland and Northern Ireland have their own systems, covered in the last step. Don't assume an English rule applies if you live elsewhere.
AB-03Check the standards your new windows or doors must meetBuilding Regulations set thermal performance standards and require safety glazing in certain locations, such as low-level panes and glazed doors. These exact figures (like U-values) are updated from time to time, so don't rely on a number from memory. Check the current standards on GOV.UK or Planning Portal before buying anything.
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You must meet the current thermal and safety glazing standards set out in Building Regulations when you replace a window or door.

AB-04Check the exceptions that change the answerIf your home is a listed building, you usually need listed building consent to change windows or doors, even like-for-like, because of their appearance. In a conservation area or other designated land, the council may restrict materials or styles. Flats and maisonettes are normally leasehold, so check your lease for a landlord's consent clause. An Article 4 direction can remove rights that would otherwise apply, so check with your council. If a window you're replacing is an escape route in a fire, for example in a loft room, the new one must be at least as good an escape window, and the opening shouldn't get smaller.
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Altering a listed building without consent, including windows and doors, is a criminal offence.

AB-05Separate planning permission from Building RegulationsThese are two different systems. Planning permission is usually not needed for straightforward window or door replacement, unless you're in a conservation area, on a listed building, or there's an Article 4 direction. Building Regulations almost always apply regardless. Not needing one does not mean you can skip the other.
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You must check planning permission and Building Regulations separately; clearing one does not clear the other.

AB-06Know who to askA FENSA or CERTASS registered installer can self-certify that the work meets Building Regulations, which is the normal route for most homeowners. If you use an unregistered installer or do the work yourself, you'll need to apply to Building Control through your council or a registered building control approver instead. For planning questions, especially listed buildings or conservation areas, check Planning Portal or ask your council's conservation officer, and consider a lawful development certificate if you want written proof planning permission isn't needed.
AB-07Realistic costs and timescalesUsing a FENSA or CERTASS registered installer, the compliance certificate is usually included in the installer's price, with no separate council fee. If you need to apply to Building Control directly, expect a fee of roughly £150 to £300, though this varies by council, plus a few weeks for the paperwork and inspection. Listed building consent applications are usually free but can take 8 weeks or longer for a decision.
AB-08What happens if you skip itWithout a FENSA/CERTASS certificate or Building Control sign-off, the council can ask you to prove compliance or carry out further work, and in theory can take enforcement action for non-compliant work. When you sell, your solicitor will ask for this certificate, and missing paperwork can delay the sale or lead to a price reduction. An indemnity insurance policy can sometimes cover the financial risk, but it doesn't fix non-compliant windows and should only be used as a last resort.
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Councils have enforcement powers under Building Regulations where non-compliant work is not resolved.

AB-09If you live in Wales, Scotland or Northern IrelandWales has its own Building Regulations system, broadly similar to England's, so check the Welsh Government or Planning Portal guidance for Wales. In Scotland, a straight replacement window or door usually doesn't need a building warrant, but making a new opening or changing its size does. Permitted development rules differ too, so check mygov.scot. Northern Ireland has its own planning and building control system entirely, covered on nidirect.

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