Building Regulations are not just about extensions and new buildings. Many internal works to existing homes are notifiable, meaning Building Control must be informed and the work inspected and certified. The common assumption that internal works are exempt because they do not change the external appearance of the property is incorrect.

Internal Works That Require Building Regulations Approval

The following types of internal work typically require Building Regulations approval in England. Removing a load-bearing wall or chimney breast requires structural approval to ensure that adequate support is provided for the structure above. Loft conversions, even where permitted development applies for the planning aspect, require Building Regulations approval for structural, thermal, fire safety, and staircase requirements. Converting a garage or other space to habitable use requires thermal and structural compliance. Installing a new bathroom or shower room in a new location triggers drainage and ventilation requirements. Replacing a boiler requires notification to Building Control unless carried out by a Gas Safe registered engineer under the Competent Persons Scheme. Installing a new electrical circuit or rewiring requires compliance with Part P unless carried out by a registered electrician who self-certifies.

Internal Works That Are Exempt

Replacing like-for-like finishes such as plastering, tiling, or flooring does not require approval. Fitting kitchen or bathroom units, cupboards, or shelving does not require approval. Decorating internally, including painting, wallpapering, and the installation of coving or other decorative finishes, is exempt. Non-structural partition walls in certain circumstances may be exempt, though this requires checking if structural implications arise.

The Importance of Completion Certificates

For any notifiable work that has been carried out, the Building Control body issues a completion certificate on satisfactory inspection. This certificate confirms that the work was inspected and found to comply with Building Regulations. When you sell the property, your solicitor will need to provide these certificates to the buyer's solicitor. Work carried out without Building Control approval will be identified as an issue and may require either retrospective regularisation or indemnity insurance before the sale can proceed.

Competent Person Schemes

Many types of installation work, including replacement windows and doors, boiler installations, electrical work, and heating system installations, can be self-certified by contractors registered with an approved Competent Persons Scheme such as FENSA, Gas Safe, NICEIC, or HETAS. When you use a registered contractor, they notify the local authority on your behalf and issue you with a certificate. This is a simpler and often faster route to Building Regulations compliance than a formal Building Control application for these types of work.

Summary

Many internal works require Building Regulations approval, including structural alterations, loft conversions, garage conversions, electrical work, boiler replacements, and new bathroom installations. Decorating, fitting units, and replacing like-for-like materials are generally exempt. Completion certificates for notifiable work are important documents that will be needed on sale or remortgage. Using Competent Persons Scheme contractors for eligible work is a convenient way to ensure Building Regulations compliance without a separate Building Control application.