Replacing an external door is notifiable work under the Building Regulations, even when you are only changing one door. Two routes prove compliance: a certificate from an installer registered with a Competent Person Scheme such as FENSA or CERTASS, or approval from your local authority building control. If you fit the door yourself, only the second route is available to you.
Yes. Replacing an external door or window in an existing dwelling is building work under the Building Regulations, and it requires either a Competent Person Scheme certificate or local authority approval. Local authorities state this plainly: the requirement applies even to a single door bought from a DIY store and fitted by the householder.
The underlying principle is worth understanding, because it explains most of the detail that follows. After the work, the building must not have a worse level of compliance than it had before. Replace a door that had background ventilation with one that has none, and you have gone backwards. Replace safety glass with ordinary glass and the same applies.
Two things this is not. It is not planning permission, which is a separate regime with separate rules. And it is not a certificate you can buy afterwards to make the problem go away, though a route exists for work already done. See below.
Most replacement doors and windows in England and Wales now require background ventilation, following changes to Approved Document F that took effect in June 2022 in England and November 2022 in Wales.
Two situations, two answers.
The door you are removing had background ventilation. The replacement must provide at least as much. Equivalent area is measured in square millimetres, and matching or exceeding the original figure satisfies the requirement.
The door you are removing had none. Under the revised guidance, background ventilation is generally required anyway, which surprises people replacing a solid door in an older house.
Trickle ventilators are the usual solution and not the only one. Through-wall ventilators and mechanical ventilation with heat recovery both provide background ventilation, and Approved Document F sets a performance requirement rather than naming a product.
Exemptions exist, most commonly for listed buildings and properties in conservation areas where the design constraints are genuine. Establish any exemption with building control before you order, not after the door arrives.
Worth connecting this to comfort rather than treating it as red tape. Sealing a house tighter without replacing the ventilation it used to have through gaps is how condensation problems start, which our guide to draughty doors covers from the other direction.
Five parts can bite on a door replacement in England. Which ones apply depends on the door and the room behind it.
Part L sets a limiting thermal performance figure for the whole unit, frame and glazing together, rather than for the glass alone. Ask your supplier to confirm the figure for the exact configuration you are ordering, because glazing choice, frame material and size all move it.
Part K is the one people fall foul of by accident. Glass in a door counts as a critical location where it comes within 1500mm of floor level, and in a window below 800mm. Glass in those positions must be toughened or laminated, and it must carry a visible safety mark. Specify it at the point of order, because it cannot be added afterwards. Our safety glazing guide sets out where the boundaries fall.
Part J is the one almost nobody mentions. If the room has an open-flued appliance, a gas fire or a solid fuel stove, the air that appliance needs comes from somewhere. Tightening up the building envelope changes that supply, and it is a question for a registered engineer rather than for a window fitter.
Part M and Part Q apply to new dwellings, extensions and residential conversions rather than to replacing a door on an existing house.
No. FENSA is a self-certification scheme for registered installation companies, and a homeowner fitting their own door cannot register or self-certify. The same applies to CERTASS.
This catches out a large number of people buying doors online to fit themselves, and it is the single most useful thing on this page. You are not exempt from the regulations because you cannot use FENSA. You use the other route.
The other route is your local authority building control. It reaches the same legal outcome, produces a certificate that satisfies a buyer's solicitor, and is entirely available to a competent DIY fitter.
Two related points. FENSA also does not cover conservatories, porches, commercial premises, new builds or extensions, so those go through building control regardless of who fits them. And an installer's own guarantee is not a compliance certificate, however it is worded.
Notify before you start rather than after. Retrospective applications exist and cost more, and building control can inspect only what is still visible once the work is finished.
Specification is the step where DIY projects go wrong, and it happens at ordering rather than at fitting. Confirm the thermal figure, the ventilation provision and the safety glazing before the door is manufactured.
Made-to-measure doors are built to the specification you give, and a door already made without safety glass in a critical location cannot be corrected on site.
This is a common situation, and it usually surfaces at the worst moment: a buyer's solicitor asks for evidence of compliance for replacement glazing installed since April 2002, and there is none.
Three routes exist.
A regularisation certificate. Apply to the local authority for retrospective approval of work already done. They will want to inspect, the fee is higher than a building notice, and remedial work may be required if the installation does not comply.
Indemnity insurance. Widely used in conveyancing, and it covers the buyer against enforcement action rather than making the work compliant. Be aware that building control bodies do not accept indemnity policies as evidence of compliance, so this is a transaction solution rather than a regulatory one.
Do nothing and disclose. Some buyers accept it, particularly on older work, and some price it in. Their solicitor decides, not you.
The practical lesson runs the other way. Notifying costs a modest fee at the time and removes a problem from a future sale, which is a better trade than most people realise when they skip it.
Replacing a door in the same opening does not normally need planning permission. Building regulations and planning permission are separate systems, and satisfying one says nothing about the other.
Planning permission comes into play in four situations.
Moving a front door is also a structural job before it is a planning one. A new or relocated opening needs a lintel and proper support, and that is building control work whatever the planning position.
Leaseholders have a fifth consideration that is neither planning nor building regulations: the lease itself often restricts alterations to the front door, including its colour.
England and Wales work through the Approved Documents described above, with FENSA and CERTASS as the Competent Person Schemes. The Part F dates differ between the two, as noted.
Scotland operates a different system under the Scottish Building Standards, with building warrants rather than building notices, and different scheme arrangements. Northern Ireland has its own regulations again.
If you are outside England and Wales, the principle holds and the process does not. Confirm the route with your local authority or your local standards department before ordering.
