Retrospective Building Regulations Approval: What to Do If Work Was Done Without It

Building Regulations approval is not just a technical compliance document — it has direct commercial consequences when you sell or remortgage a property.

**At conveyancing**: Your solicitor is obliged to ask about Building Regulations compliance for any visible extensions, loft conversions, or structural alterations to the property. If approval was not obtained, the solicitor must disclose this to the buyer's solicitor. The buyer's solicitor will then advise their client of the risk.

• **Buyer and lender implications**:
• •Mortgage lenders may decline to lend on a property where significant structural works lack Building Regs approval
• •Buyers may negotiate a price reduction to reflect the risk
• •Buyers may require indemnity insurance before proceeding
• •Buyers may require the works to be regularised (retrospectively approved) as a condition of purchase

**The structural safety issue**: Beyond the commercial implications, works carried out without Building Regs approval may not comply with the structural, thermal, or fire safety requirements that were current at the time. A loft conversion without proper fire escape provisions, or an extension on inadequate foundations, represents a real safety risk — not just a paperwork gap.

**Enforcement time limits**: Local authorities have a 12-month enforcement window for most contraventions of Building Regulations (from the date of completion of the work). After 4 years for dwellings, enforcement for the work itself is time-barred — though this does not mean the work is approved or safe.

A Regularisation Certificate is a formal retrospective Building Regulations approval issued by a Local Authority Building Control (LABC). It is not available from Approved Inspectors — only LABC can issue Regularisation Certificates.

**How the process works**: 1. Contact the Building Control department of the local authority where the property is situated 2. Submit a Regularisation Application — essentially a description of the works, drawings showing what was built, and a fee (typically similar to the standard Building Regs application fee) 3. Building Control will arrange an inspection 4. If the work is exposed (e.g., can be inspected without opening up), they will assess compliance against the regulations that were in force at the time the work was carried out 5. If the work cannot be inspected (because it is hidden behind plaster, under floors, etc.), the inspector will specify what must be opened up 6. If the work is compliant (or can be made compliant with remedial works), a Regularisation Certificate is issued 7. If the work is not compliant, the inspector will specify what must be done to achieve compliance

• **Opening-up costs**: The main practical challenge with regularisation is that much of the work (foundations, structural elements, insulation, wiring) may be hidden. Opening up floors, walls, or ceilings to expose hidden work for inspection can cost:
• •Minor opening-up (single floor section): £500–£1,500
• •Significant opening-up (multiple areas): £2,000–£8,000
• •Full opening-up (extensive) can cost more than re-doing the original work

• **Regularisation fees (LABC, London boroughs, 2025)**:
• •Small works (single room extension, single beam): £300–£600
• •Medium works (full extension): £500–£900
• •Large or complex works: £800–£1,500+

**Limitations**: A Regularisation Certificate confirms that the work was inspected and found compliant with regulations at the time of construction — it is not the same as a completion certificate issued at the time. Some solicitors and lenders treat them differently, though most accept them for standard residential transactions.

Where regularisation is impractical (work too old, cost too high, risk of inspection revealing non-compliance that would require expensive remediation), indemnity insurance is the most commonly used alternative in property transactions.

• **What indemnity insurance covers**:
• •The buyer is protected against the cost of a local authority enforcement action requiring the works to be regularised or removed
• •The insurer indemnifies the insured against losses if the local authority takes enforcement action

• **What indemnity insurance does NOT cover**:
• •Structural defects — the insurance does not warrant that the works are structurally safe
• •Future buyers automatically — though policies are typically assignable to future buyers
• •Events occurring after the insured disclosures are made — contacting the local authority after taking out a policy can invalidate it

**Critical rule**: Once a decision is made to take out indemnity insurance, do NOT contact the local authority about the unauthorised works — making contact triggers the authority's awareness of the breach, which may lead them to take action, and this typically invalidates the insurance.

• **Cost of indemnity insurance (2025)**:
• •Standard extension/loft without Building Regs: £150–£400 single premium (lifetime cover)
• •Larger or more complex works: £300–£800
• •Commercial property or high-value residential: more

**Lender acceptance**: Most high-street mortgage lenders accept indemnity insurance for missing Building Regs on older works (typically over 4 years old) in standard residential transactions. Some lenders are more cautious about structural works — confirm with the buyer's mortgage provider before relying on insurance as the sole solution.

**Step 1 — Identify the extent of the issue**: Commission a structural surveyor (RICS Building Survey) to assess the visible condition of the works — not just whether paperwork is missing. The surveyor will flag any visible structural or safety concerns that suggest the works may be sub-standard.

• **Step 2 — Assess the options**:
• •If the work looks structurally sound and the issue is purely paperwork: indemnity insurance is usually the appropriate solution
• •If there are structural concerns: the surveyor will advise on further investigation and potentially on regularisation or remediation
• •If the work is clearly unsafe (e.g., insufficient fire escape from a loft conversion): do not proceed without ensuring the works are made safe — this is a physical risk, not just a legal one

• **Step 3 — Negotiate with the seller**:
• •Ask the seller to obtain indemnity insurance as a condition of purchase
• •Or negotiate a price reduction reflecting the cost and risk of regularisation or remediation

**Step 4 — Confirm lender's position**: Before exchange of contracts, confirm with your mortgage lender (via your broker) that they will lend on the property with indemnity insurance in place. Some lenders require regularisation for recent works — clarifying this early saves wasted conveyancing costs.

• **If you are selling a property with missing Building Regs**:
• •Disclose the position honestly in the TA6 form (failure to disclose is misrepresentation)
• •Obtain indemnity insurance before listing — removes the issue as a negotiating point for buyers
• •Consider regularisation if the works are recent (within 4 years) or if you can demonstrate compliance — adds value and removes the insurance risk