The Dos and Don’ts of Building Control

Article Summary:
Building control applies to almost every home project. Understanding the rules helps you avoid delays, rework and compliance issues.

Whether you’re extending your home or building from scratch, you’ll need to consider building control. Some projects may not require planning permission, but building regulations apply to all work — so understanding the dos and don’ts is essential.

What is building control?

Building control ensures every domestic project meets safety, structural and energy-efficiency standards.

Building control covers a wide range of regulations, although not all will apply to every project. Key areas include structural safety, fire safety, moisture protection, ventilation, energy efficiency, drainage, and electrical safety. Each section of the regulations is listed as Parts A–R.

Materials & workmanship – Regulation 7
Structural safety – Part A
Fire safety – Part B
Moisture protection – Part C
Ventilation – Part F
Conservation of fuel & power – Part L
Electrical safety – Part P
Security – Part Q
And many more depending on the project

What work has to comply?

Most projects require some form of building control oversight. Small detached buildings under 30m² with no sleeping accommodation may be exempt, as are some conservatories and like-for-like repairs. However, extensions, structural changes and any new building work will almost always require compliance.

If in doubt, contact your local authority — they can confirm whether approval is needed.

Project Type	Building Control Requirements
Oak frame extensions	Structural safety, ventilation, fire safety, materials approval
Small outbuildings & garden rooms	Often exempt if under 30m² and no sleeping accommodation
Repairs / like-for-like replacements	Usually exempt unless structural or involving electrics
Conversions & major renovations	Almost always require approval, including Part L and Part P

Do’s and don’ts of building control

Do’s

Set a realistic plan and schedule to coordinate inspection visits.
Speak to the planning department early or work with an architect/builder.
Check party wall agreements if shared boundaries are involved.
Consider off-site construction like oak frame kits for faster progress.

Don’ts

Don’t change the design mid-project — it can trigger reapproval.
Don’t add bedrooms without adequate bathrooms (1 per 2 bedrooms).
Don’t proceed without clear drawings and a full project plan.
Don’t assume existing heating or services will be sufficient.

Conclusion

Building control affects most home projects, but it doesn’t need to cause delays or complications. With the right understanding and preparation, your project can progress smoothly and compliantly.

Last updated: 26 November 2025

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