Do I Need Building Control for Internal Works

Many internal works in the UK require Building Control approval, depending on the nature and scale of the changes. While some cosmetic alterations are exempt, any internal work that affects the structure, safety, energy efficiency or use of a building will typically need to comply with Building Regulations. Whether you are remodelling a kitchen, removing a wall or converting a loft, it is essential to understand what must be notified and inspected to remain within the law.

When Building Control Is Required

You will need Building Control for internal works if they involve structural alterations, fire safety provisions, drainage changes, electrical systems or anything that affects the overall performance or safety of the building. Common examples include removing or altering load-bearing walls, converting lofts or garages into habitable rooms, changing floor layouts, adding bathrooms, or significantly altering plumbing and electrics.

Work that affects access for disabled users, creates new internal rooms, modifies means of escape, or changes thermal insulation values also falls within Building Regulations. Fitting new staircases, adding mezzanine floors, or moving boilers may all trigger the need for approval and inspection.

When It May Not Be Required

Basic cosmetic changes such as painting, wallpapering, replacing flooring, installing new kitchen units without altering layout or services, and other non-structural improvements typically do not need Building Control. Replacing internal doors like-for-like, or putting up partition walls that are non-load-bearing and do not affect fire safety or escape routes, may also be exempt.

However, even simple works can require approval if they form part of a larger project or if your building is listed or located in a conservation area. For example, changing the layout of a flat in a converted building with shared access may affect fire safety and would need Building Control involvement.

Electrics and Drainage

Internal electrical work is covered by Building Regulations, especially in bathrooms, kitchens or anywhere close to water. If you are rewiring part of your house or installing new circuits, you will either need to use a Part P registered electrician under the Competent Person Scheme or notify Building Control directly.

Similarly, if your internal work involves moving or adding toilets, sinks, showers or drainage pipes, Building Control will usually need to inspect that the new installations are properly connected and meet hygiene and safety standards.

Loft Conversions and Structural Changes

Converting a loft into a bedroom, office or any habitable space always requires Building Control approval. This is due to the structural work involved in floor strengthening, insulation, escape routes and fire protection. The same applies if you are removing chimney breasts, knocking through walls, or creating large open-plan living areas. Building Control officers will need to inspect supports, fire separation, ventilation and structural stability.

Fire and Accessibility Requirements

Internal work in buildings with multiple dwellings, flats or HMOs (houses in multiple occupation) must meet additional fire safety and access requirements. Installing fire doors, interlinked smoke alarms, escape lighting or protected staircases may be required, even for what might seem like minor internal alterations.

Examples in Practice

A homeowner in Derby knocked through the wall between a kitchen and dining room to create a modern open-plan space. Although the wall was not obviously structural, a structural engineer confirmed it carried load from above. Building Control approval was required and the council inspected the steel beam installation before signing it off.

In another case, a couple in Bristol renovated their bathroom by replacing the suite and tiling the walls. No structural changes or drainage alterations were made and all electrical work was carried out by a Part P registered installer. Building Control approval was not required.

How to Apply

You can apply to your local authority’s Building Control team or use an Approved Inspector. For most internal works, a Building Notice may be sufficient, allowing you to start work quickly without full plans. However, if the work is complex or involves structural design, you may be advised to submit a Full Plans application.

During the works, Building Control will inspect key stages and, once completed, issue a certificate confirming compliance with the regulations.

Conclusion

You will need Building Control for many types of internal work in the UK, particularly if they involve structural changes, drainage, electrics, fire safety or access provisions. Even seemingly minor alterations can have legal implications if they impact the performance or layout of your property. Always check with your local authority or an Approved Inspector before starting. Getting the right approvals ensures your project is safe, legal and future-proof.