Certificates, Conveyancing and the Windows You Leave Behind
Photo by Photo by Viktor Forgacs on Unsplash on Unsplash
Most of us compare windows the way we compare a new kitchen: frames, glass, colour, price, maybe a quick check of the guarantee. The paperwork tends to come last, if it comes at all. That is understandable. Nobody buys double glazing dreaming of FENSA certificates. But when the house eventually goes on the market, those dull bits of paper can matter more than the handle finish you spent three weekends choosing.
Why window paperwork turns up at conveyancing
When you sell a house in the UK, your solicitor puts together a bundle of information for the buyer's solicitor. Alongside the title deeds, fixtures and fittings forms and the property information questionnaire, there are questions about work done to the property. Replacement windows and doors usually fall into that conversation.
Building Regulations approval is generally required for replacement windows and doors in England and Wales because they need to meet thermal performance and safety standards. In practice, that approval is often handled through a competent person scheme such as FENSA or CERTASS. The installer registers the work and you receive a certificate. If the work was done through a local authority building control route instead, there should be a completion certificate.
None of this is glamorous. But a buyer's solicitor will often ask for evidence that replacement windows were signed off. If it cannot be found, the sale can slow down, and sometimes it can wobble.
The documents that tend to matter
There is no single magic folder that covers every property, but these are the ones that come up most often:
- FENSA or CERTASS certificate for replacement windows and doors fitted by a registered installer.
- Building Regulations completion certificate where the work went through local authority building control.
- Installer guarantee or insurance-backed warranty showing what is covered, for how long, and whether it can be transferred to a new owner.
- Planning permission or listed building consent where the property is in a conservation area, is listed, or the work otherwise needed consent.
- A simple record of the installation date, installer and product specification, which is not a legal requirement but is surprisingly useful when a buyer asks what kind of glass or frame was used.
If you have lived in the house for years and cannot remember which route was used, start with the installer. A reputable firm should be able to dig out the registration. If the installer has disappeared, the scheme operator may still hold a record. It is worth asking before you put the house on the market rather than after a buyer's solicitor raises a query.
Where indemnity policies fit in
An indemnity policy is an insurance product that can be used when there is a missing certificate or a breach of a restrictive covenant. In window terms, it is sometimes offered when there is no evidence that replacement windows had Building Regulations approval.
It is not a replacement for a certificate. It is a workaround. The policy usually covers the buyer, and sometimes their lender, against financial loss if a local authority later takes enforcement action. In practice, enforcement action for older replacement windows is rare, which is why indemnity policies are often accepted. But they are not free, they do not prove the work was done properly, and some lenders are fussier than others.
A policy is also not much use if the real issue is poor installation. It may satisfy a conveyancing tick box, but it will not fix a draughty frame or a failed sealed unit. That is why the paperwork question and the quality question should be asked together, not treated as separate hobbies.
What this means when you are comparing installers
If you are buying windows in 2026, the paperwork conversation should happen before you sign, not years later when you are trying to sell. A few practical checks go a long way:
- Ask which competent person scheme the installer belongs to. FENSA and CERTASS are the names most buyers will recognise. If they are not in a scheme, ask who will handle Building Regulations approval and what certificate you will receive.
- Ask what arrives after installation. You want a certificate or completion notice, a guarantee document, and a clear record of the products fitted. If the answer is vague, treat that as information.
- Check whether the guarantee is insurance-backed and transferable. A transferable guarantee can be a small selling point when you move.
- Keep the documents somewhere sensible. A folder, a cloud file, a note in the house file. Future you will be grateful, and future buyer will be less suspicious.
- Do not assume the buyer's solicitor will accept a verbal explanation. They usually want a document. That is not unreasonable.
The quiet value of a boring folder
Windows are one of those home improvements that become invisible when they are working well. The paperwork is the same. Nobody admires a FENSA certificate on a Sunday morning, but it can save a week of email tennis when you sell.
So when you are weighing up quotes, add one more column: what documentation comes with the job. It is not the most exciting part of buying windows. It might, however, be the part that keeps a future sale moving.
At Clearvue Windows, we think a confident buying decision includes knowing what follows the house after the installers have gone. Frames and glass matter. So does the paper trail.
