Discovering that a building regs completion certificate is missing is one of the most common conveyancing complications in the UK. Whether you are selling a property where work was done years ago without proper sign-off, or buying and your solicitor has raised a requisition, understanding your options — and what each costs — is essential. This guide explains what a completion certificate is, why the common "10-year rule" belief is wrong, and how to resolve the problem.
What Is a Building Regulations Completion Certificate?
Under Section 17 of the Building Act 1984, a local authority is required to issue a completion certificate if it is satisfied that the work described in full plans (or building notice) has been completed in accordance with the Building Regulations. For work approved by an Approved Inspector (a private sector building control body), the equivalent document is a final certificate.
A completion certificate is not the same as Building Control approval. Approval records that the project was registered and that plans met the regulations. The completion certificate records that a Building Control Surveyor inspected the finished work and confirmed it was compliant. Many homeowners — and some builders — obtain approval and then never call for a final inspection, leaving the project legally incomplete.
For a full introduction to how Building Regulations work — including Full Plans vs Building Notice applications, exempt works, and which projects are notifiable — see the Building Regulations approval guide and the detailed building regs completion certificate guide.
The Difference Between Approval and Completion
| Document | What It Confirms | When Issued |
|---|---|---|
| Full Plans Approval | Plans submitted comply with Building Regulations | Before work starts |
| Building Notice Acknowledgement | Notice of intended work has been received | Before work starts |
| Completion Certificate (LABC) / Final Certificate (AI) | Completed work was inspected and meets Building Regulations | After final inspection |
The 10-Year Limitation Period: A Common Misconception
A widely held belief is that Building Control enforcement has a 10-year limitation period — after which the local authority loses the power to take action. This is incorrect for Building Regulations enforcement.
Section 36 of the Building Act 1984 gives a local authority 12 months from the date of completion of the work to issue a notice requiring removal or alteration of non-compliant work. After 12 months, the Section 36 enforcement route is time-barred. However, this does not mean the building regulations issue "goes away."
The 10-year period that often comes up in property transactions relates to planning enforcement (not Building Control) — specifically, the 10-year period for enforcement of material changes of use or breach of condition under Section 171B of the TCPA 1990. They are entirely separate regimes. Mortgage lenders and conveyancers take the position that a missing completion certificate remains a relevant defect regardless of age, because it cannot be confirmed that the work was compliant.
What Mortgage Lenders and Solicitors Require
When buying or remortgaging a property where notifiable building work has been carried out, your solicitor will raise enquiries asking for evidence of Building Regulations approval and completion. If the completion certificate is missing, the standard response options are:
- Provide the completion certificate (or final certificate from an Approved Inspector)
- Provide indemnity insurance (see below)
- Apply for retrospective regularisation (see below)
Most mortgage lenders — following UK Finance guidance — will accept indemnity insurance in lieu of a completion certificate for older works, provided the policy provides adequate cover and the work is otherwise structurally sound. For recent work (within the last 12 months), many lenders and solicitors will not accept insurance and will require regularisation or a retrospective inspection instead.
Your solicitor will also have raised this issue as part of the conveyancing process — for a full explanation of what solicitors check at this stage, see the conveyancing process UK explained guide.
The Three Options When the Certificate Is Missing
Option 1: Regularisation Application
A regularisation application allows you to obtain retrospective Building Control sign-off from the local authority for unauthorised work. You submit an application to the LABC (Local Authority Building Control) describing the work; an inspector will assess it, usually requiring opening up of fabric to check concealed elements (e.g., a damp proof membrane under a floor screed, or beam bearings behind plasterwork). If the work complies — or can be made to comply with remedial works — a regularisation certificate is issued.
Note: regularisation is available only from the local authority, not from Approved Inspectors. If the original work was overseen by an AI, only the LABC has jurisdiction to regularise.
Option 2: Indemnity Insurance
Building Regulations indemnity insurance is a one-off single-premium policy that indemnifies the current owner (and successors in title, mortgagees) against enforcement action or loss arising from the absence of a completion certificate. It does not mean the work is compliant — it simply provides financial protection if a problem arises.
Important caveats:
- Never contact Building Control before obtaining indemnity insurance — doing so "activates" the authority's awareness of the breach and invalidates most policies.
- Insurance does not address a genuine structural defect. It protects against enforcement, not against the cost of remedying defective work.
- Most policies exclude claims arising from physical damage caused by the non-compliant work itself (though some broader policies cover this).
Option 3: Retrospective Inspection by Building Control
In some cases — particularly where work is recent and inspections were missed — LABC may agree to carry out a final inspection and issue a completion certificate if the work is found to be compliant. This is only possible where the construction application is still "open" (not yet closed as abandoned). Contact LABC first to establish whether the original application is still live.
Costs Comparison
| Route | Typical Cost | Timescale | Outcome |
|---|---|---|---|
| Indemnity insurance (simple extension/conversion) | £200–£400 one-off premium | 1–5 days via solicitor | Policy indemnifying against enforcement |
| Indemnity insurance (complex work / high-value property) | £400–£800+ one-off premium | 3–10 days; may require specialist insurer | Policy indemnifying against enforcement |
| Regularisation application fee | 1.5× the original Building Control fee (minimum ~£200) | 4–12 weeks | Regularisation certificate (formal compliance) |
| Opening-up works (if required) | £300–£1,500+ depending on scope | During regularisation process | Necessary to inspect concealed work |
| Retrospective final inspection (open application) | No additional fee | 2–4 weeks to arrange | Completion certificate if work passes |
LABC vs Approved Inspector Records
If the original work was overseen by an Approved Inspector (AI) rather than LABC, the completion certificate will be in the form of a Final Certificate lodged with the LPA. AIs are required to lodge their final certificates with the local authority, so LABC should have a record of it. However, the actual completion certificate is held by the AI organisation. Many AI organisations have been acquired, merged, or dissolved — if the original AI can no longer be traced, enquire with LABC.
What to Do If the Local Authority No Longer Holds Records
LABC records are subject to retention schedules. For older works — typically pre-1990s — records may have been destroyed lawfully. In this case:
- Obtain a letter from LABC confirming they hold no records for the work in question (this helps justify the indemnity insurance position to the buyer's solicitor).
- Commission a structural surveyor or building surveyor to inspect the work and provide a professional opinion on compliance. For a guide to what structural surveys can assess, see the structural survey UK guide and the how to read a structural engineer's report guide.
- Proceed with indemnity insurance on the basis of the LABC's no-records confirmation and the surveyor's inspection report.
A missing completion certificate need not derail a transaction. With the right approach — the correct insurance policy, or a regularisation certificate — it is a resolvable defect. The key is addressing it before exchange of contracts rather than trying to manage it under time pressure after a buyer has been found.
Related Guides
- Building Regs Completion Certificate UK — the full guide to what completion certificates cover, how to trace records, and the conveyancing implications
- Building Regulations Approval UK Guide — which projects are notifiable, Full Plans vs Building Notice, and how Competent Person Schemes work
- Structural Survey UK Guide — when to commission a Level 3 survey on a property where Building Regs sign-off is missing
- The Conveyancing Process UK Explained — how solicitors raise and resolve missing completion certificates as part of the standard conveyancing process
- How to Read a Structural Engineer's Report UK — understanding the professional opinion a surveyor provides when Building Control records no longer exist
- Garage Conversion Living Space UK — one of the most common sources of missing completion certificates; this guide covers the full Building Regs requirements for garage conversions
- Building Regulations Completion Certificates: Why They Matter — a companion guide covering which works require sign-off, the Part P/G/L/F requirements, and the homeowner checklist for obtaining and keeping certificates