Discovering that your FENSA certificate has gone missing halfway through selling your home is enough to make most sellers panic.
Perhaps your buyer’s solicitor has suddenly asked for it. Or maybe you’ve emptied every drawer in the house and still can’t find it.
The good news is that a missing FENSA certificate doesn’t automatically mean your sale will collapse. In many cases, the issue can be resolved, especially if you act early and work closely with your solicitor.
The first thing to do is establish whether a certificate actually exists. If it does, you can usually order a duplicate FENSA certificate. If no record can be found, there may still be other ways to demonstrate compliance or move the transaction forward.
What is a FENSA certificate?
A FENSA certificate is a document confirming that replacement windows or doors complied with Building Regulations. It also shows that it was done by a FENSA approved installer and registered with the local authority.
You can view a register of FENSA approved installers on the official website. Keep in mind that FENSA certificates aren’t a guarantee of the quality or future performance of the windows.
Since FENSA was introduced in 2002, millions of certificates have been issued across England and Wales. This makes it likely that a buyer will ask for a certificate when you’re selling a house.
What does FENSA cover?
A common misunderstanding is that every window-related job should come with a FENSA certificate.
In reality, FENSA generally applies to replacement external windows, replacement external doors, roof windows and roof lights installed by a FENSA Approved Installer under the Competent Person Scheme.
It doesn’t usually apply to conservatories, porches, new-build properties, extensions or simple repairs where existing windows are being repaired rather than replaced. In those situations, different Building Regulations processes or approvals may apply instead.
This matters because some homeowners spend hours searching for a certificate that never existed because the work wasn’t ever covered by FENSA.
Why does a FENSA certificate matter when selling?
During conveyancing, the buyer’s solicitor wants evidence that replacement windows or doors complied with the Building Regulations that applied when they were installed. A certificate provides that reassurance quickly.
Without it, the buyer’s solicitor may ask additional questions, or the lender could want further clarification. In some cases, the buyer themselves may become nervous about whether the work was completed correctly.
First step: check whether a certificate exists
You can search the FENSA register using your property’s postcode and address or, if you have it, the certificate number itself. If the installation was registered correctly, you can usually order a FENSA duplicate certificate directly.
As of August 2026, the current fee for a FENSA duplicate certificate is £30, including VAT, when ordered online. Replacement certificates are normally issued after payment has been processed.
Ordering a replacement is often the quickest and cheapest solution if the original paperwork is lost.
What if no FENSA record appears?
Not finding a certificate doesn’t necessarily mean something has gone wrong.
Start by checking when the windows or doors were installed. If the installation predates the introduction of FENSA, there may never have been any FENSA certificate.
If the work is more recent, another Competent Person Scheme may have been used. Not every registered installer belongs to FENSA.
It’s also possible that the work was approved directly through your local authority’s Building Control department rather than being self-certified under a competent person scheme.
If you still have the installer’s details, contact them. They may be able to confirm how the work was certified or provide copies of any records they still hold.
Can you still sell without a FENSA certificate?
Yes, you can. A missing FENSA certificate doesn’t prevent you from selling your property.
In most cases, though, it’ll trigger extra enquiries. Your buyer’s solicitor may ask for alternative evidence. The buyer may ask whether Building Regulations approval exists elsewhere or whether another solution can be agreed upon.
Most property sales involve some degree of negotiation over paperwork. Missing certificates simply become another issue to resolve rather than an automatic deal-breaker.
What alternatives might be available?
One possibility is providing Building Control documentation if the work was approved through the local authority.
Another is supplying guarantees, installer paperwork or other supporting evidence. This will show when and how the installation took place.
Sometimes the installer can confirm the details directly. In other situations, solicitors may discuss indemnity insurance.
What is indemnity insurance?
Indemnity insurance doesn’t necessarily prove the windows comply with Building Regulations.
Instead, it’s designed to protect against certain legal risks arising from missing Building Regulations documentation. It’s not evidence that the installation is safe, compliant or free from defects.
Some buyers and lenders are perfectly satisfied with indemnity insurance, while others ask for extra reassurance.
If your solicitor advises indemnity insurance as the preferred solution, they may also advise you not to contact the local authority about retrospective approval beforehand. Doing so can sometimes affect whether indemnity insurance remains available.
Always follow your solicitor’s legal advice before taking any action.
Could missing paperwork delay the sale?
In some cases, yes. Whether the delay lasts a day or several weeks depends largely on how quickly everyone responds.
If the missing certificate is easily replaced, the issue may disappear almost immediately. If extra investigations are required, the buyer’s solicitor may need time to review alternative evidence.
The buyer could request further inspections, and quotes for remedial work may be obtained if concerns exist.
Sometimes buyers use missing paperwork as a reason to renegotiate the purchase price. This is especially common if other issues have already emerged during the transaction.
So, it depends on the situation. When you respond promptly and honestly, and then take proactive action, it doesn’t need to add much time onto the process at all. Indeed, you could still sell your house fast.
Don’t leave paperwork until exchange
You shouldn’t wait until after receiving an offer to deal with your paperwork. Instead, do it proactively to make your life easier.
You should check for window certificates, guarantees, Building Regulations approvals and any other paperwork buyers commonly request.
If something is missing, you have much more time to resolve it.
Other documents buyers may request
Window paperwork is only one part of the conveyancing process. Depending on your property, buyers may also ask for the following:
- Planning permissions
- Building Regulations certificates
- Electrical certificates
- Gas safety documentation
- Warranties
- TA6 form
- TA10 form
- Guarantees
- Energy Performance Certificates
If you’re unsure what you’ll need, it’s worth reading WeBuyAnyHome’s guide to the documents needed to sell a house before accepting an offer. You can also read about the documents you receive as proof of sale.
Preparing early almost always leads to a smoother transaction.
Frequently Asked Questions
What is a FENSA certificate?
A FENSA certificate confirms that qualifying replacement windows or doors installed by a FENSA Approved Installer complied with the relevant Building Regulations and were correctly registered.
Can I sell without a FENSA certificate?
Yes. Missing paperwork may prompt additional enquiries, but it doesn’t automatically prevent a house sale.
How do I get a duplicate FENSA certificate?
Search the FENSA register using your postcode, address or certificate number. If a record exists, you can order a duplicate FENSA certificate online.
How much does a duplicate certificate cost?
As checked in August 2026, a FENSA duplicate certificate costs £30, including VAT, when ordered online through FENSA.
Is indemnity insurance enough?
Sometimes, but not always. It deals with certain legal risks associated with missing documentation rather than proving the installation is compliant or safe. Whether it’s appropriate depends on the circumstances and should be discussed with your solicitor.
Can missing window paperwork delay completion?
Yes. Missing certificates can lead to additional solicitor enquiries, requests for alternative evidence, indemnity insurance discussions or price negotiations. Many sales still complete successfully once the issue has been addressed, though.
Missing FENSA Certificate When Selling a House
Finding out your FENSA certificate is missing can feel like a major setback, but it rarely means the end of your sale.
Start by checking whether a certificate already exists. If it does, order a duplicate – and if no record can be found, don’t assume the situation is hopeless. Your solicitor can help explore alternatives, whether that’s other compliance documents, supporting evidence, or indemnity insurance.
Most importantly, don’t ignore the issue. The earlier you deal with missing paperwork, the less likely it is to become a source of delay or negotiation later in the transaction.
If you’d rather avoid long conveyancing queries, buyer negotiations and paperwork delays altogether, WeBuyAnyHome offers a faster, chain-free alternative. You can get started today by visiting Get My Cash Offer and finding out whether selling to a cash buyer could work for you.
