Do I Need Building Control

If you're planning to build, extend, convert or alter a property in the UK, chances are you’ll need Building Control approval. Building Control is a legal process that ensures construction work meets national safety, structural, energy efficiency and accessibility standards. Unlike planning permission, which deals with the appearance and use of buildings, Building Control focuses on how they are built. Most types of building work require it, and failing to comply can lead to enforcement notices, costly mistakes and issues with property sales.

When You Need Building Control Approval

You typically need Building Control for any structural changes, new buildings or alterations that affect safety, insulation, ventilation, drainage or access. Common examples include building an extension, converting a loft or garage, knocking through structural walls, fitting new heating systems, installing bathrooms where there were none before or changing the use of a building.

Even seemingly minor changes, like replacing windows or rewiring parts of a property, may require approval depending on how much work is involved and whether it affects compliance with Building Regulations. If in doubt, always check with your local authority or an Approved Inspector before starting work.

Types of Work That Usually Need Approval

Building a new house or commercial building always needs Building Control. The same applies to extensions, roof alterations, changes to foundations, installation of rooflights or dormers, underpinning, internal reconfigurations involving load-bearing walls, and most major refurbishments.

Other types of work such as installing underfloor heating, converting a cellar, adding a conservatory with heating or drainage connections or altering access for disabled use all typically require inspection and certification. Replacing a fuse box or boiler, fitting a wood burner or building a porch may also trigger the need for approval depending on size and impact.

When Building Control Is Not Required

Certain types of work are exempt from Building Regulations, particularly small repairs or non-structural improvements. Painting, decorating, like-for-like replacement of kitchens and bathrooms, fitting wardrobes or shelving and most landscaping tasks do not require Building Control.

Small detached outbuildings under 15 square metres that are not used for sleeping accommodation may also be exempt, as are certain greenhouses, garages or porches if they meet strict size, location and use criteria. However, exemptions can be complex and depend on how the building is used and what it connects to, so it is always safest to check in advance.

How the Process Works

You can apply for Building Control through your local authority or via an Approved Inspector. There are two main application types. A Full Plans application involves submitting detailed drawings and calculations before work starts, which are then checked for compliance. This is often used for larger projects such as extensions or new builds.

A Building Notice is a simpler process that does not require plans upfront but is best suited to smaller or routine work. With both routes, inspections are carried out at key stages such as foundations, drainage, insulation and final completion. Once the work is finished and compliant, you will be issued a completion certificate.

Why Building Control Matters

Building Control ensures the safety and long-term performance of your property. Without approval, you may face enforcement from the council or be required to undo or alter completed work. Most importantly, if you sell or remortgage your home in future, missing certificates can delay or derail transactions. It may also affect your insurance or leave you liable for damages if the work is unsafe.

Examples in Practice

A couple in Leeds added a kitchen extension to the rear of their semi-detached home. They submitted a Full Plans application through the local authority, which reviewed the drawings and carried out site inspections throughout the build. The work was signed off with a completion certificate, ensuring peace of mind and future market value.

In another case, a homeowner in Hampshire removed a structural wall to create an open-plan living space without notifying Building Control. The work lacked proper reinforcement, and a buyer’s survey later revealed issues. The sale of the house fell through, and the owner had to apply for retrospective approval and pay for corrective works.

Conclusion

You will need Building Control approval for most forms of building, extension, or conversion work in the UK. It is a legal requirement that safeguards the quality, safety and durability of buildings. Unless the work is minor or clearly exempt, always notify your local Building Control body or hire an Approved Inspector. Doing so ensures your project meets national standards and protects the value and safety of your home for years to come.