You’re three offers into a house sale, or halfway through a remortgage, when your solicitor asks a question you weren’t expecting: where’s the building regulations completion certificate for the loft conversion, extension or rewire the previous owner did? If the answer is “I don’t know”, you’re not alone, and it’s rarely the crisis it first feels like.
A building regs completion certificate copy is usually available from your local authority’s building control department, even years after the work was done — but if the work was never signed off in the first place, you need a different fix, and it’s worth knowing which situation you’re actually in before you panic. The two problems look identical from the kitchen table. They aren’t, and they’re solved differently.
What a completion certificate actually proves
A building regulations completion certificate confirms that notifiable work — an extension, loft conversion, new boiler, rewiring, replacement roof, or certain window installations — was inspected and signed off as compliant with the Building Regulations in force at the time. It’s issued either by your local authority’s building control team or by a private Approved Inspector who oversaw the job.
It isn’t the same as planning permission, and it isn’t proof the work was done well in a general sense — it’s specifically proof that a building control surveyor checked it and was satisfied. No certificate doesn’t automatically mean the work is unsafe; it sometimes just means the paperwork was never chased up.
Why buyers, solicitors and lenders ask for it
When you sell, your buyer’s solicitor will ask for evidence that any notifiable alterations were signed off. A missing certificate doesn’t necessarily kill a sale, but it introduces uncertainty lenders and buyers don’t like, and it can slow a chain down at exactly the point everyone wants to move fast. Sorting it early — ideally before you list the house — avoids a scramble later.
Step one: check what you already have
Before contacting anyone, search your own paperwork properly. Completion certificates often turn up with the house deeds, old mortgage documents, or a folder handed over at completion. Check email too — many local authorities now issue certificates digitally, so a recent one may simply be sitting in an old inbox.
Your own solicitor’s file from when you bought the house — certificates are sometimes included in the conveyancing pack.
Any digital home logbook you or a previous owner may have used.
The original builder or architect, if you know who did the work and they’re still trading.
Step two: request a copy from building control
If you can’t find it, the certificate was issued by whichever body inspected the work — almost always your local authority’s building control department, occasionally a private Approved Inspector.
Most councils have an online form or dedicated email address for building control record requests. You’ll typically need the property address, an approximate date for the work, and a description of what was done — the more specific, the faster the search. There’s usually a small administration fee.
If an Approved Inspector rather than the council carried out the inspection, the trail can be harder to follow, particularly if that company has since closed. The council should still hold a record that the work was notified to an Approved Inspector, even without the certificate itself.
What if the work genuinely wasn’t signed off?
Sometimes the search comes back empty because there’s nothing to find — the work was never notified to building control, whether through oversight, a corner-cutting builder, or a previous owner not realising notification was required. This is a more involved situation, but a manageable one, and far more common than most homeowners assume.
Here’s the opinion worth having: don’t assume unsigned-off work means enforcement action is coming, and don’t assume it’s fine to just leave it either — both reactions are usually wrong, and the right answer depends on what the work actually was. Structural work like a loft conversion or chimney breast removal is worth regularising properly. An old, straightforward boiler swap is often dealt with more pragmatically, particularly close to a sale.
Regularisation
For work recent enough to inspect retrospectively, you can apply to your local authority for a regularisation certificate. Building control assesses the work as it stands now, which may involve opening up finishes to check insulation, structural fixings or fire safety — so it isn’t always simple, and can mean remedial work if something falls short of current standards.
Indemnity insurance: the practical fallback
For older work where regularisation isn’t realistic — the original contractor long gone, or opening up finished rooms disproportionate to the risk — a lack-of-building-regulations indemnity insurance policy is the standard workaround, particularly at the point of sale. It’s a one-off, relatively inexpensive policy protecting buyer and seller against the cost of future enforcement action, rather than certifying the work itself. Your conveyancing solicitor can usually arrange one quickly once everyone agrees it’s the right route.
What to do in the next 30 minutes
Search your own paperwork, including old emails, for anything mentioning building control or a completion certificate.
Note what work you think might be affected, and roughly when it was carried out.
Find your local authority’s building control department and check their record request process.
If you’re preparing to sell, flag this to your solicitor now rather than waiting for it to surface mid-transaction.
If the work is recent and unsigned off, weigh up whether it’s worth regularising now, before it becomes an older, harder problem.
Keep a copy of every certificate, warranty and compliance document in Home+ as soon as you get it, so the next time someone asks, you’re not searching a shoebox for the answer.
Store your building control paperwork in Home+ the moment you receive it — a five-minute habit now saves a stressful search later.
FAQ
How do I get a copy of a building regulations completion certificate? Contact your local authority’s building control department with the property address and an approximate date for the work. Most councils charge a small fee for a record search and can email a copy if one exists.
What if my council can’t find any record of the certificate? It may mean the work was never notified to building control, in which case regularisation or indemnity insurance are the usual routes, rather than a simple lost-paperwork search.
Does a missing completion certificate stop me selling my house? Not automatically, but your buyer’s solicitor and lender will usually want it resolved — with a copy certificate, a regularisation certificate, or indemnity insurance — before the sale completes.
Is indemnity insurance the same as getting the work signed off? No. It protects against the financial risk of future enforcement action; it doesn’t certify the work meets Building Regulations. Regularisation is the route that actually gets the work formally assessed.
Do I need a completion certificate for every home improvement? No — only “notifiable” work, such as most extensions, loft conversions, structural alterations, new boilers, rewiring and certain window replacements. A new kitchen or bathroom fit-out generally isn’t notifiable in the same way.
