Selling a House Without Building Regulations Approval: What Can Go Wrong and Why Indemnity Insurance Isn’t the Answer

^{April 2026}

Introduction

Many homeowners only find out that earlier building work doesn’t have Building Regulations approval when they decide to sell. It’s a stressful moment — what seemed like a minor issue can suddenly stall a sale, cause the buyer to walk away, or knock thousands off the property’s value.

This article looks at why Building Regulations matter when you sell, the problems we see most often, and why relying on indemnity insurance is rarely the answer.

Why Building Regulations Matter When You Sell

When a property goes on the market, the conveyancing process is all about proving that everything is above board. One of the key documents you’ll complete is the Law Society’s Property Information Form. Section 4 asks for details about any alterations or extensions, and specifically requests copies of planning permissions, Building Regulations approvals, and completion certificates.

If you can’t provide those documents, you’ll need to explain why. And if that explanation doesn’t hold up, it can trigger serious concerns. There have even been legal cases where sellers claimed no work was carried out, only for it to be discovered later — resulting in compensation being paid to the buyer.

Buyers, their solicitors, and mortgage lenders all want to know that any work — such as extensions, loft conversions, structural changes, or changes of use — meets Building Regulations. Without the paperwork, buyers can’t be sure the work is safe, lenders may refuse to lend, and surveyors often flag it as a risk. Unsurprisingly, this uncertainty can slow things down or derail a sale completely.

Common Problems We See

Loft conversions are one of the biggest trouble spots. They’re often marketed as extra bedrooms, but turn out to lack proper fire escape routes, adequate structural support, or compliant insulation and ventilation. Even if the work looks good, the absence of approval raises a red flag for buyers and lenders.

We also see plenty of issues with changes of use — for example, when a building has been changed from commercial to residential use, or split into flats without the right approvals ( or vice versa). These projects have additional requirements around fire safety, insulation, ventilation, and drainage, and missing paperwork here can cause major headaches later on.

Then there are the “open plan” projects — where walls, chimney breasts, or structural supports have been removed without the correct checks or calculations. Without evidence that the work was properly designed and approved, surveyors often ask questions that can hold up or even halt a sale.

What Usually Happens During a Sale

In most cases, missing approvals are discovered when the buyer’s survey or solicitor starts digging. The surveyor spots the alteration, the solicitor raises questions, and suddenly the buyer becomes cautious.

At that point, a number of things can happen: the buyer might ask for a reduction in price, their mortgage company might withhold funds, or the seller might scramble to sort things out mid-transaction. Often as not, the buyer just walks away. Even simple sales can become stressful once Building Control issues surface.

Why Indemnity Insurance Isn’t the Fix It Appears to Be

Indemnity insurance often gets suggested as a simple solution, but it’s really just a sticking plaster. It only protects the buyer or lender against the slim chance of the local authority taking enforcement action — it doesn’t confirm that the work is safe or compliant.

Worse still, the policy becomes invalid if the local authority is contacted, and many lenders now see these policies as more of a formality than real protection. Indemnity insurance doesn’t fix the problem; it just postpones it until the next sale.

If you want true peace of mind — and a smoother selling process — proper compliance is the only way forward.

The Right Way to Fix It: Regularisation

If the work doesn’t have Building Regulations approval, the official route is to apply for what’s called regularisation. This is retrospective approval through the local authority. The process involves submitting an application, providing drawings, and allowing building control officers to inspect the work.

Sometimes parts of the structure need to be opened up so compliance can be checked, but once approved, you’ll get formal confirmation that the work meets Building Regulations. That document reassures buyers and lenders, and it sets your property up for a stress-free sale in the future.

Older Works — Do They Matter?

For older properties, things can be a little different. If the work was done before certain rules came in, or before certification was standard practice, missing documents aren’t always a deal-breaker. However, if the property has been altered several times or by different owners, it’s worth getting professional advice. Often, a survey or partial regularisation will solve lingering doubts and keep the transaction moving.

When to Act

The best time to deal with missing approvals is well before you put your property on the market. Getting advice early helps avoid delays, stops problems from cropping up mid-sale, and gives your agent and solicitor clear information to work with.

Leaving things until a buyer is involved usually limits your options — and adds unnecessary pressure at a time when you want everything to move smoothly. 

Conclusion

Selling a home without Building Regulations approval can cause real complications. Indemnity insurance might seem easy, but it doesn’t actually fix anything. The most reliable route is to get professional guidance, establish what approvals are missing, and sort them through regularisation where needed.

A little preparation goes a long way — and can be the difference between a smooth sale and a stressful one.

Need Advice?

If you’re not sure whether past works at your property comply with the Building Regulations, we can help. Our team can inspect, advise, and guide you through the best way to put things right — saving you time, stress, and money when it comes to selling. Contact us HERE.