Building Control Completion Certificate: Why It Matters

Building Regulations approval is required for most structural and notifiable work on existing and new residential buildings. The key categories for homeowners are:

**Extensions**: All extensions to a dwelling (regardless of whether planning permission is required or not) require Building Regulations approval under Part A (structure), Part B (fire), Part C (moisture), Part F (ventilation), Part L (energy), and potentially other Parts depending on the scope. A completion certificate must be issued when all inspections have been passed.

**Loft conversions**: Any loft conversion creating a habitable room requires Building Regulations approval — this is the most common example of a completion certificate being missing from a property file. Many loft conversions were carried out in the 1980s and 1990s without proper Building Regulations approval, or approval was obtained but no final inspection was called for, so no certificate was issued.

**Structural alterations**: Removal of load-bearing walls, installation of steel beams, chimney breast removals, and structural opening works all require Building Regulations approval and a completion certificate.

**Electrical work (Part P)**: Notifiable electrical installation work (new circuits, consumer unit replacement, work in kitchens and bathrooms) requires a Part P compliance certificate — either issued by a registered competent person (NICEIC, ELECSA, NAPIT registered electrician) or confirmed by Building Control.

**Gas work**: All gas installation work must be carried out by a Gas Safe registered engineer. A gas safe certificate (installation certificate) is issued by the engineer — this is not the same as a Building Regulations completion certificate, but it is equally important for property transactions.

**Certain changes of use**: Converting a house to flats, a flat above a shop, or other material change of use requires Building Regulations approval and a completion certificate for the converted units.

**The conveyancing search**: When a property is sold, the buyer's solicitor carries out a local land charges search (LLC1) and a Con29 enquiry of the local authority. The Con29 includes enquiries about Building Regulations applications and whether completion certificates have been issued. The LPA's Building Control department holds records of all Building Regulations applications and their status.

If a search reveals an outstanding Building Regulations application — one where approval was granted and work was carried out but no completion certificate was issued — the buyer's solicitor will raise a requisition on title. This typically takes the form: 'Please confirm that a Completion Certificate has been issued in respect of [description of works and application reference].'

• If no completion certificate exists:
• •The buyer's mortgage lender may refuse to lend until the situation is regularised
• •The buyer may require the seller to: obtain a retrospective Building Regulations completion (if possible); obtain an indemnity insurance policy; or agree a price reduction to reflect the unknown condition
• •In some cases, the absence of a completion certificate causes a transaction to fall through

• **The three-year and ten-year rules for enforcement**:
• The local authority has limited enforcement powers in relation to unlawful building work — specifically:
• •Operational development (structural work) — enforcement action can be taken within 4 years of the work being substantially completed
• •Change of use — enforcement action can be taken within 10 years of the material change of use

After these time limits, the LPA cannot take enforcement action against the breach of Building Regulations (though the work may still not comply with the current regulations). However, enforcement limitation does not produce a clean title — the buyer's solicitor will still query an absent completion certificate, and building indemnity insurance is still required to satisfy the mortgage lender.

**Regularisation applications — retrospective Building Regulations approval**: Where work has been carried out without Building Regulations approval (or where approval was obtained but no completion certificate was issued), it is possible to apply for a Regularisation Certificate from the local authority's Building Control department.

• A regularisation application involves:
• •Submitting an application for regularisation (the fee is approximately 1.5× the normal Building Regulations application fee)
• •Building Control visiting the site to inspect the work as built (inspections are limited to what is accessible without opening up)
• •If the work as built meets the Building Regulations that were in force at the time the work was carried out, a Regularisation Certificate is issued
• •If the work cannot be adequately inspected, or if it does not meet the standards, Building Control may require opening up of elements (removing floor finishes to inspect floor structure, removing ceiling panels to inspect beam bearings) before they can certify compliance

The regularisation process can be straightforward (for clearly compliant work carried out by competent tradespeople) or very complex and expensive (for structural work of uncertain quality where the inspector cannot be satisfied without intrusive investigation).

**Approved Inspectors (now Building Control Bodies — BCBs)**: Since the Building Safety Act 2022 changes came into force, private Building Control providers (formerly called Approved Inspectors, now Registered Building Control Approvers) operate alongside local authority Building Control. Where an approved inspector was used for the original application, regularisation applications must go back to the original approved inspector or to the local authority. Approved Inspector-issued completion certificates are legally equivalent to local authority completion certificates.

• **Step 1: Check what Building Regulations applications exist for the property**:
• Request an LLC1 and Con29 search (or ask the LPA's Building Control department directly) to identify all Building Regulations applications relating to the property. This reveals:
• •What applications were made, and when
• •Which have a completion certificate and which are outstanding

• **Step 2: If a certificate is outstanding, establish why**:
• •Was the work actually completed? If work was started but not completed, the application may be genuinely outstanding
• •Was a final inspection requested? Many clients forget to call for the final inspection — and the certificate is never issued even though the work complied. In this case, contacting the local authority and requesting a final inspection (even many years later) may be possible, depending on the LPA's records and the age of the application
• •Was the work carried out by a competent contractor to a compliant standard? If so, a regularisation application is likely to succeed
• •Was the work non-compliant? If the work was structurally inadequate or does not meet Building Regulations, a regularisation certificate cannot be issued without bringing the work into compliance (or demonstrating that the non-compliance is acceptable under the regulations in force at the time)

**Step 3: Building indemnity insurance — when it is the right solution**: Where a regularisation certificate cannot be obtained (the work is too old, the LPA's records are incomplete, or the inspection reveals that the work is compliant but documentary evidence is missing), building indemnity insurance is the practical solution:

*Building indemnity insurance* (also called Lack of Building Regulations consent indemnity or Absence of Planning/Building Regulations indemnity) is a one-off premium insurance policy that covers the risk that the LPA may take enforcement action against the unlawful works, or that a future buyer may discover the absence of a certificate and claim against the seller's legal title.

• *Key points about building indemnity insurance*:
• •Premiums are typically £200–£1,500 depending on the nature, age, and value of the work and the property value
• •The policy must be taken out WITHOUT disclosing the issue to the LPA — once the LPA is notified, the policy terms are triggered and cannot be reinstated
• •The policy does not regularise the work — it covers the financial risk of enforcement action; if the LPA subsequently takes enforcement action, the insurance covers the cost of compliance, not the cost of any structural defects in the work
• •Most mortgage lenders will accept building indemnity insurance for older work (more than 4 years old for structural work, more than 10 years old for change of use)

• **Best practice for clients commissioning new work**:
• •Always use a contractor who carries out Building Regulations applications as a standard part of the project — not as an optional extra
• •Always call for the final inspection before practical completion — and obtain the completion certificate before making the final payment to the contractor
• •Store the completion certificate, along with the approved drawings and all other compliance documentation, in the property file for future reference at point of sale