No Building Regulations Compliance Certificate? What Buyers and Solicitors Will Ask

Picture the scene. Your offer's been accepted, the searches are back, and then an email lands from the buyer's solicitor: "Please provide the building regulations compliance certificate for the boiler installed in 2021." You have a vague memory of a nice engineer, a cup of tea and a card with a phone number. No certificate. Nothing in the drawer, nothing in your inbox.

Don't panic. I've seen this plenty of times, and it's almost always fixable. What helps most is knowing what the other side is really asking, so you can answer before they chase. This is for England and Wales, by the way. Scotland and Northern Ireland work differently.

The Questions You'll Probably Get

Solicitors work from checklists, and the same questions come up again and again. Here's roughly what to expect.

"When was the boiler installed, and by whom?" They want a date and a company name. Even a rough date helps. If you've got an invoice or a bank statement showing the payment, that's useful evidence.

"Was the installer registered?" They're checking whether the engineer was on a competent person scheme such as Gas Safe. That matters because registered installers can self-certify the work and notify the council.

"Was the work notified to Building Control?" This is the heart of it. If it was, there should be a record, and a certificate should have been issued.

"Do you have the commissioning paperwork and any warranty?" More on that in a moment.

"Has it been serviced since?" Not strictly a legal requirement for homeowners, but a service history is reassuring.

Answer these in writing, in one email, with copies of whatever you have. It saves everyone a week of ping-pong.

Why the Certificate Matters to Them

It's worth understanding why they care, because it changes how you respond. A solicitor is protecting the buyer, and the buyer's lender is protecting its security. A gas appliance with no proof it was installed to regulations is a risk to both. There's the safety angle, and there's the chance that the council could one day take enforcement action over unapproved work, although in practice that's rare.

Most solicitors aren't looking to kill the sale. They're looking for a way to tick the box. Give them something they can tick, and the matter usually goes away.

What Counts as Proof If the Certificate Is Missing

Here's a rough order of things I'd try, starting with the quickest.

The installer's records. Ring the company. A registered installer should be able to confirm the job was notified and send a copy of the certificate, or at least tell you the reference. Have your address and the approximate date ready.

The scheme or the council. If the company's gone or won't respond, the competent person scheme or your local authority's Building Control team can sometimes confirm a notification. It's slower and they'll want proof of ownership.

Supporting documents. An invoice, a manufacturer's warranty, a commissioning record, even a dated photo of the boiler data plate. None of these replaces the certificate, but together they build a picture.

Indemnity insurance. A one-off policy covers the buyer if the council takes action over missing paperwork. It's common in conveyancing and it's often cheap relative to a collapsed sale. But acceptance depends on the buyer's solicitor and lender, so ask before you buy one. Don't assume.

When It Was Never Notified

Sometimes the honest answer is that the work wasn't registered at all. Maybe the installer wasn't on a scheme, or didn't bother with the paperwork. Cheap cash jobs from years ago are the usual culprit.

If that's the case, there's no certificate to find, and an insurance policy might not be enough on its own. The tidier fix is to apply to Building Control for retrospective approval, usually called regularisation. They may want to inspect the installation, and a Gas Safe engineer may need to check the boiler and flue. If something's wrong, it has to be put right.

That's more effort and more cost, but at the end you get a proper document. I'd always rather see someone do that than hope the buyer doesn't ask.

No Building Regulations Compliance Certificate vs No Other Paperwork

People mix up the documents, and so do some estate agents, so let me clear it up.

The compliance certificate shows the installation was notified under building regulations. It's not the same as a gas safety record, which is a check of existing appliances, and it's not the commissioning checklist the installer fills in when the boiler's first fired up.

When someone says they need a boiler certificate, ask what they mean. The answer changes what you send, and I've watched sales stall for days because the wrong document went over.

The commissioning certificate or checklist is separate again. It proves the boiler was set up and tested correctly, and manufacturers usually want to see it for the warranty. If you've got that but not the council certificate, send it anyway. It's useful supporting evidence.

Check the Warranty Trail

If you've got a boiler under a manufacturer's guarantee, that's another route to proof. Brands like Vaillant register the installation and issue a warranty, and Vaillant installers who are accredited can register the boiler on the customer's behalf. Check your email for a confirmation or a warranty card. It names the installer, the date and the model, which gives your solicitor a lot to work with.

Don't throw those emails away. A new owner may want to claim on that guarantee later, and the registration is often tied to the property.

How I'd Handle It If I Were Selling

If it were my house, here's what I'd do on day one. I'd write down everything I know about the installation. I'd look for any paperwork from the day, including bank payments. I'd ring the installer and ask for a copy. If that didn't work in a week, I'd tell my solicitor straight away and ask how they'd prefer to proceed, rather than waiting for them to ask me.

Telling them early matters. Solicitors dislike surprises, and a seller who flags a gap and proposes a fix comes across a lot better than one who goes quiet.

When to Get Someone to Look at the Boiler

If the installation looks dodgy, or you've no idea who fitted it, have it inspected. A Gas Safe engineer can confirm it's safe and tell you whether it would pass today's requirements. That inspection report is also useful paperwork for the solicitor. And if you do need to book someone locally, an engineer who knows the local council's approach to regularisation can save you a few rounds of back-and-forth.

Practical Takeaway

A missing building regulations compliance certificate is annoying, but it's rarely a deal-breaker. Collect what you have, contact the installer, tell your solicitor early, and be ready to offer indemnity insurance or retrospective approval if the certificate can't be found. Keep your boiler commissioning certificate and warranty paperwork together too, because they back up the story when the main document's missing. If the installation is undocumented or you're unsure about its condition, a plumber south london engineer can check it over before it holds up your sale.

Plumr South London can help if you can't find your boiler paperwork, or if you'd like the installation checked before a buyer's surveyor does it for you.

We'll tell you honestly what you've got, what's missing, and the quickest way to close the gap.

FAQs

1. What Happens If I Don't Have a Building Regulations Compliance Certificate When Selling?

The sale isn't automatically blocked, but the buyer's solicitor will usually raise it as a query. Common solutions are getting a copy from the installer, applying for retrospective approval, or offering indemnity insurance. Without any of these, the buyer may ask for a price reduction or delay exchange.

2. Can I Sell a House Without a Boiler Installation Certificate?

Yes, it's legally possible, but it's likely to cause delays. Buyers and lenders usually want proof that the boiler installation meets building regulations. Having it resolved before listing makes the sale smoother.

3. How Do I Get a Replacement Compliance Certificate?

Contact the installer first, as they can confirm the notification and request a copy. If that fails, the competent person scheme or your local council's Building Control may be able to help. If the work was never notified, you can apply for retrospective approval.

4. Does Indemnity Insurance Cover a Missing Compliance Certificate?

Often, yes. A one-off indemnity policy can protect the buyer if the council later takes action over unapproved work. It's commonly used in conveyancing, but whether it's accepted depends on the buyer's solicitor and lender, so check first.

5. What Is Retrospective Approval for Building Regulations?

Retrospective approval, sometimes called regularisation, is where you ask your local authority's Building Control to assess work that was done without notification. They may inspect the installation and require changes. If it's approved, they issue a certificate.

6. Do Buyers Ask for the Commissioning Checklist as Well?

Often they do. A commissioning checklist shows the boiler was set up and tested correctly and is commonly needed for the manufacturer's warranty. It's separate from the compliance certificate, but it's useful supporting evidence if the main certificate is missing.