Selling a House With Unresolved Building Regulations (2026 UK)
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Selling a House With Unresolved Building Regulations

Quick answer

Unresolved building regulations — where past work (an extension, conversion, new windows, electrics) lacks a building-regulations completion certificate — raises an enquiry on a sale and can make a cautious lender hesitate. You can resolve it with a regularisation certificate, use indemnity insurance for older work, disclose and price for it, or sell as-is to a cash buyer who completes in 7-28 days. You must disclose the position honestly.

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  • Missingcompletion certificate
  • Regulariseor insure
  • 7-28 dayscash, disclosed
Two voluntary schemes — NAPB and TPO — are your only real safety net. Check for both.

What unresolved building regs means

Building regulations govern how work is built — structure, safety, insulation, electrics, drainage — and compliant work is evidenced by a completion certificate. "Unresolved" building regs means past work (an extension, loft conversion, new windows, a boiler or electrical work) was done without that sign-off, or the certificate is missing. The buyer’s solicitor will check building-control records and raise an enquiry about it (see selling without building regs).

£ £££ One offer Several, competing
One company gives a take-it-or-leave-it figure. Several, competing, push the price up.

How to resolve it

OptionDetail
Find the certificateIt may exist — check with the council/installer
Regularisation certificateApply to the council to assess and certify the work
Indemnity insuranceCommon fix for older work
Disclose & sell as-isTo a cash buyer

Regularisation vs indemnity insurance

Regularisation means applying to the local authority to inspect and certify the work — it may require opening up parts of it, but produces a proper certificate and the widest market. Indemnity insurance suits older work where enforcement is largely time-barred, protecting the buyer and lender so a mortgage sale can proceed without regularising. Do not contact the council about the specific work once you intend to insure, as that can void the policy.

Disclosure

You must disclose unresolved building regulations on the property information form — the buyer’s solicitor checks building-control records, so concealment is futile and risks a claim. Provide whatever you have: any certificates, the date of the work, and any indemnity policy. Honest disclosure with a clear plan (regularisation or insurance) reassures buyers and keeps the sale on track.

Get several genuine offers side by side — comparison keeps every company honest.

Selling fast

If regularising is slow, the issue is deterring mortgage buyers, or you need speed, a cash buyer will purchase with the issue disclosed, accept or insure the risk, and complete in 7-28 days without a lender to satisfy. You disclose the position, accept a price reflecting it, and gain certainty. See FENSA and HETAS for specific certificate cases.

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Lisa Hayes, founder of Ready Steady Sell

Written & reviewed by Lisa Hayes, Founder

Lisa Hayes is the founder of Ready Steady Sell and an independent UK home-selling expert with over a decade helping homeowners weigh cash house buyers, property investors and the wider fast house-sale industry — without pressure or hidden fees. Every guide is reviewed for accuracy under our editorial standards.

Frequently asked questions

Straight answers, no sales talk

Can I sell a house with unresolved building regulations?

Yes — resolve it with a regularisation certificate, use indemnity insurance for older work, disclose and price for it, or sell as-is to a cash buyer. You must disclose it.

What is a building-regulations completion certificate?

The document confirming that building work met the regulations (structure, safety, insulation, electrics). Missing it for past work raises an enquiry on a sale.

How do I resolve missing building regs?

Find the certificate if it exists, apply for a regularisation certificate from the council, or use indemnity insurance for older work where enforcement is largely time-barred.

Does missing building regs stop a mortgage?

It can give a cautious lender pause until resolved by regularisation or indemnity insurance. Cash buyers are unaffected.

Do I have to disclose unresolved building regs?

Yes — disclose it on the property information form. The buyer’s solicitor checks building-control records, so concealment is futile and risks a claim.

How fast can I sell with unresolved building regs?

A cash buyer can complete in 7-28 days, buying with the issue disclosed and accepting or insuring the risk.