Selling with missing Building Regulations paperwork is one of those problems that feels small until a buyer’s solicitor gets involved. It’s common with older extensions where the work was done years ago, sometimes by a previous owner, sometimes by a builder who ‘sorted it’ informally. If you’re in extension without building regs selling territory, the real question is what will satisfy a buyer, and if there’s a lender in the background, what will satisfy them too. Two routes come up again and again: a Regularisation Certificate, or indemnity insurance. They are not the same thing, and choosing the wrong one can slow the sale or even kill it.
Extension Without Building Regs Selling: What Buyers And Lenders Actually Care About
Building Regulations (often shortened to ‘building regs’) are about safety and performance: structure, insulation, fire safety, electrics and drainage, depending on the work. They’re separate from planning permission, which is about whether the extension was allowed in the first place. You can have planning permission and still have a building regs problem, and vice versa.
When an extension has no completion certificate (or you can’t find it), a buyer’s solicitor is usually thinking about 3 risks:
- Safety and hidden defects: if the work wasn’t inspected, was it done properly?
- Enforcement: could the council take action? This risk drops with time, but it doesn’t always go away in people’s minds.
- Future sale and remortgage: today’s buyer doesn’t want tomorrow’s headache.
Lenders vary. Some will accept indemnity insurance. Others want evidence the work complies, especially where the extension affects structural walls, steel beams, loft conversions, or any work that changes means of escape for fire safety.
First, Get Clear On What’s Missing
Before you pick regularisation or indemnity, pin down what you’re missing. There are 3 common scenarios:
- You had a completion certificate but it’s been lost: the council may be able to provide a copy from their records.
- The work was never signed off: maybe inspections happened, but no final certificate was issued.
- The work was never notified: no Building Control involvement at all.
If you’re unsure, start with your local authority Building Control records, or if it was done under an Approved Inspector, ask for the final certificate. Government guidance on the overall process is set out in Building Regulations approval guidance.
Also note the practical point: once you contact the council about missing sign-off, it can affect whether indemnity insurance remains available. More on that below.
Regularisation Certificate: What It Is And When It Works
Regularisation is a way to get retrospective approval for certain work that should have had Building Regulations approval. In plain terms, Building Control inspect what they can see, ask for evidence and may require parts of the structure to be opened up so they can check key items. If they’re satisfied, you get a Regularisation Certificate. Local Authority Building Control explain the idea in their regularisation certificates overview.
Regularisation is most suitable when:
- The extension is relatively recent and you can still access evidence (plans, photos, builder details).
- The buyer, lender, or their solicitor is pushing for compliance evidence, not just insurance.
- You’d rather deal with any defects now than pass a question mark to the next owner.
The downsides are real. It can be slow, it can cost more than you expect, and it can involve disruption. If Building Control can’t verify key elements without opening up work, they may ask you to do it. If they find problems, they can require remedial works before issuing the certificate.
Costs vary by council and by project. In practice, you’re looking at a fee to the council plus the cost of any investigation and remedial work. If you’re selling and time matters, regularisation can be the slower route.
Indemnity Insurance: What It Does And Its Limits
Indemnity insurance for missing building regs is often misunderstood. It does not prove the extension is safe, and it does not pay to fix poor work. It is a legal policy that typically covers the buyer (and lender) for losses arising from enforcement action by the local authority relating to the lack of Building Regulations approval.
Indemnity can be attractive in an extension without building regs selling situation because it’s usually quick and cheap. A one-off premium might be roughly £50 to £300 for many homes, though it can be more depending on property value and the insurer’s view of risk.
However, indemnity has strings attached:
- No contact with the council: if you’ve already approached Building Control about the issue, insurers may refuse to cover it.
- It won’t fix defects: if the buyer is worried about structure, insulation, or fire safety, a policy may not calm them.
- It won’t cure a lender’s requirements: if the lender wants sign-off, insurance won’t change that.
Indemnity often works best where the extension has been there for years without problems, there’s no sign of enforcement interest, and the buyer just wants the file ‘closed’ so solicitors can move on.
Regularisation Vs Indemnity: A Side-By-Side Comparison
If you’re weighing indemnity vs regularisation, think of it as proof vs protection. One tries to evidence compliance. The other tries to reduce a specific legal risk.
| Option | What You Get | Main Benefit | Main Catch | Typical Cost Range | Typical Timescale |
|---|---|---|---|---|---|
| Regularisation Certificate | Retrospective Building Regulations approval (if passed) | Clear evidence for buyer and lender | May require opening up work and making repairs | £200 to £1,000+ fees, plus any works | Weeks to months |
| Indemnity Insurance | Policy covering losses from certain enforcement risks | Fast, minimal disruption | Does not confirm quality or safety, often invalid if council contacted | £50 to £300+ one-off premium | Days (sometimes same day) |
How This Plays Out In A Real Sale
In most chains, the problem isn’t the missing paperwork itself, it’s the uncertainty. The buyer’s solicitor asks a standard set of enquiries. The buyer starts picturing hidden costs. The lender’s valuer might flag it. That’s when sales drift.
Here’s a practical way to think about it:
- If you can evidence the build and you’re not time-pressured, regularisation can be cleaner in the long run.
- If you’re time-pressured and the buyer’s lender is relaxed, indemnity may be enough to keep things moving.
- If the extension is clearly poor quality, neither route is a magic fix. You may need to price accordingly, or carry out remedial works, because buyers will spot physical red flags even if paperwork is ‘handled’.
It’s also worth being realistic about buyer psychology. Someone already anxious about defects will stack worries. If there are other known issues, such as building regs missing extension and damp, you’re more likely to face tougher questions and renegotiation late in the process.
What To Disclose (And What Not To Guess)
If asked, you should answer honestly. If you don’t know whether the work was signed off, say you don’t know and explain what evidence you do have (for example, old plans, invoices, dated photos, or prior surveys). Avoid guessing dates or claiming approval exists when you can’t support it. A misstatement can cause a bigger problem than the missing certificate.
Also, don’t treat planning permission and building regs as interchangeable. A buyer may accept that planning wasn’t needed (for example, permitted development), but still insist on building regs compliance evidence.
If you need a mental model for ‘paperwork risk’, compare it to other lender-sensitive issues where documentation matters. For flats, for example, indemnity vs regularisation style debates often turn into questions about what a lender will accept, rather than what feels reasonable to a homeowner.
Conclusion
Selling a house with an extension without building regs is usually fixable, but it’s rarely painless if you leave it until the buyer’s solicitor raises it. Regularisation aims to prove compliance and can involve time, inspections and remedial work. Indemnity insurance is quicker and cheaper, but it only covers a narrow legal risk and won’t reassure everyone.
Key Takeaways
- Regularisation is about evidence of compliance, and may involve opening up the build.
- Indemnity is about legal protection, not build quality, and can be ruled out if the council has been contacted.
- For extension without building regs selling, the right route depends on your buyer, their lender and how time-sensitive the sale is.
FAQs
Is Building Regulations The Same As Planning Permission?
No. Planning permission is about whether the extension was allowed, while Building Regulations are about how it was built and whether it meets safety and performance standards.
Can I Get A Regularisation Certificate For Any Old Extension?
Not always, and it can be harder for very old work because evidence is missing and the build can’t be fully inspected without disruption. Building Control can also require remedial works before issuing a certificate.
Will Indemnity Insurance Satisfy A Mortgage Lender?
Sometimes, but not always. Some lenders accept a policy for missing paperwork, while others want evidence of compliance, especially for structural alterations or higher-risk work.
Does Indemnity Insurance Cover Fixing A Poor Extension?
No. It typically covers certain losses linked to enforcement action, not the cost of putting defects right or rebuilding parts of the extension.
Disclaimer
Information only: This article is general information, not legal advice, surveying advice, or Building Control guidance for your property. Building Regulations requirements and council processes vary, so consider speaking with a solicitor and your local Building Control team for case-specific guidance.
