Introduction
Planning permission and Building Regulations are often confused — but they are completely different things. Planning permission is about whether a building can be built at all. Building Regulations are about how it's built — the technical standards it must meet for structure, fire safety, energy performance, drainage, ventilation, and more. You can have planning permission without needing Building Regulations approval, and you can need Building Regulations approval without needing planning permission. Understanding when Building Regulations apply is an essential part of managing a construction project properly.
What Are Building Regulations?
Building Regulations are minimum technical standards set by the UK government that building work must comply with. They are administered locally by Building Control — either the local authority's department or an Approved Inspector. The Regulations cover structure (stability and loading), fire safety (means of escape and fire spread), site preparation and moisture resistance, resistance to sound between dwellings, ventilation (air quality and extract ventilation), sanitation and water efficiency, drainage and waste disposal, combustion appliances and fuel storage, protection from falling and impact, conservation of fuel and power (energy efficiency and insulation), accessibility, glazing safety, electrical safety, and security where applicable. Most building work touches several of these areas simultaneously.
When Do Building Regulations Apply?
Building Regulations apply to the vast majority of construction work in England. Extensions — all structural extensions to a dwelling require approval. Loft conversions — all loft conversions require approval, covering structural floor, means of escape, fire doors, insulation, and staircase. Structural alterations — removing or modifying a load-bearing wall or installing a beam requires approval. Electrical installations — new circuits, new consumer units, and certain installation work in kitchens and bathrooms require either self-certification by a registered electrician or a Building Notice. New boilers and heating systems require notification and certification. Conversions — converting a garage to habitable use, converting a house to flats, or changing the use of a space requires compliance and often formal approval.
The Two Main Routes for Approval
Full Plans Application. You submit detailed drawings and specifications to Building Control before work begins. They review and issue approval or request amendments. Inspections are carried out during the build at key stages. A completion certificate is issued at the end. This route is best for larger or more complex projects and is recommended for most extensions and loft conversions.
Building Notice. You notify Building Control before work starts but don't submit full drawings in advance. An inspector visits the site at key stages. This route is faster to initiate but carries more risk — issues may only be identified during the build rather than before it starts.
Competent Person Schemes
For certain types of work — electrical installation, plumbing, boiler fitting, glazing, and roofing — tradespeople registered with a Competent Person Scheme can self-certify their work as compliant without a formal Building Regulations application. This doesn't mean the work is exempt from the Regulations — it means the registered tradesperson takes responsibility for ensuring compliance. Always ask for the self-certification certificate on completion of any such work.
The Completion Certificate
At the end of a Building Regulations-approved project, the Building Control body issues a completion certificate — formal confirmation that the work was inspected and found to comply. Always obtain and keep this certificate. Mortgage lenders and solicitors routinely ask for it on property sale. If a previous owner carried out work without Building Regulations approval, it may be possible to obtain retrospective approval or a regularisation certificate — but this is more expensive and more complex than following the correct process from the start.
RCB Design & Build manages the Building Regulations process on behalf of clients — from application submission through to completion certificate. Contact us to discuss your project.