Building regulations are often confused with planning permission — but they're entirely separate. Here's a clear explanation of what they cover and when you need them.
Building regulations are one of the most misunderstood aspects of the construction process for homeowners. They are completely separate from planning permission and cover different things entirely — yet many people confuse them, or assume that permitted development means no approvals are needed at all.
Building regulations set the minimum technical standards for construction work in England. They cover structural safety, fire escape routes and fire resistance, thermal insulation, drainage and sanitation, ventilation, electrical safety, accessibility, and several other technical areas. Their purpose is to ensure that buildings are safe and healthy for their occupants — both during the build and for the life of the building.
You need building regulations approval for any of the following work: extensions and loft conversions, new buildings, structural alterations (including removing or altering load-bearing walls), installation of new electrical circuits, new bathrooms, new heating systems or boilers, re-roofing projects, and underpinning. There are some minor works that are exempt — for instance, like-for-like repairs, most garden structures, and some internal redecoration.
The process typically works as follows. Before work begins, your builder submits either a Full Plans Application (where the detailed drawings are checked and approved upfront) or a Building Notice (which allows work to start more quickly without full drawings, with the inspector checking as work progresses). The inspector visits at key stages — foundations, structural work, insulation, and so on — and issues a Completion Certificate at the end when they are satisfied that all regulations have been met.
The Completion Certificate is a critically important document. When you come to sell your property, your solicitors will require evidence that any notifiable building work has been properly approved. If you cannot produce a completion certificate, you may need to take out indemnity insurance — which adds cost and complication to your sale.
Unauthorised building work that does not comply with building regulations can require costly remediation, and in some cases can be an enforcement notice requiring demolition. Always insist that your builder manages the building regulations process — it is a non-negotiable part of any reputable firm's standard service.
Key Takeaways
- Building regulations and planning permission are completely separate
- Regulations cover structural safety, fire, insulation, and drainage
- You need a completion certificate at the end of the project
- Failing to get approval can cause problems when selling
- Unauthorised work can require costly remediation
