Do I Need Building Control for Permitted Development

Yes, even if your project qualifies as permitted development, you may still need Building Control approval. In the UK, planning permission and Building Regulations are two entirely separate systems. Permitted development rights allow certain types of work to go ahead without needing a planning application, but this does not remove the requirement to comply with the Building Regulations. These regulations ensure the safety, structural integrity and energy performance of your build, and they still apply regardless of whether you need planning consent.

Understanding Permitted Development

Permitted development refers to a set of national rules that grant automatic planning permission for certain types of minor works. These rights cover many common home improvements, including single-storey rear extensions, loft conversions, outbuildings, porches and garage conversions, provided the work stays within specific size and location limits. If your project meets all the criteria, you do not need to apply for planning permission from your local authority.

However, just because a project is classed as permitted development does not mean it avoids the need for Building Control oversight. Building Regulations still apply to ensure construction standards are met, especially where the work affects structure, insulation, drainage, electrics or fire safety.

When Building Control Is Required

You will need Building Control approval for most work that involves:

Structural changes such as removing walls or installing beams
Adding new habitable space, such as loft rooms or extensions
Converting garages or outbuildings into living areas
Installing drainage systems, toilets or new heating systems
Replacing windows, doors or roofs (unless like-for-like in limited cases)
Internal works that affect fire escape routes or accessibility

Even if your extension falls within permitted development rules, if it includes electrical work, structural steelwork or drainage connections, it will trigger Building Regulation requirements. This also applies to loft conversions, which often involve new stairs, insulation, floor strengthening and fire protection—all of which must be checked and signed off by a Building Control officer or Approved Inspector.

Proof of Compliance

If you sell your home in the future, solicitors will ask for proof that all building work was compliant with the Building Regulations. Without a completion certificate, you may need to apply for retrospective approval or face legal and insurance issues. This is especially important for permitted development projects, which may not be recorded in the local planning system.

To avoid confusion, many homeowners apply for a Lawful Development Certificate before starting permitted development work, which proves the project does not need planning permission. However, this does not replace Building Control approval. The two processes are independent and must be dealt with separately.

Practical Example

A homeowner in Surrey converted their garage into a home office under permitted development. They did not need planning permission, but because the work involved new insulation, electrical sockets and fire-rated plasterboard, Building Control approval was required. An inspector visited during and after the work and issued a completion certificate that was later requested when the property was remortgaged.

Conclusion

Even if your project qualifies as permitted development, Building Control approval is usually still required. These are two separate systems, and compliance with the Building Regulations is legally mandatory. Always check with your local authority or an Approved Inspector before beginning work. Securing the right inspections and documentation ensures your project is safe, legal and protected for the future.