Do I need building regulations approval for my extension?
Watch our video: A building control case study of building an extension
Building control and extensions
An extension will have a major effect on your home, garden and neighbours and may well need building regulations approval, even if it doesn't need Planning Permission.
In drawing up plans you will need to look at how it would affect things like access to your home and garden, movement in and around your home and the natural light in existing rooms. You will also need to consider what building materials to use – particularly if your home was built using unusual construction techniques or materials.
Once you have decided your home is suitable for an extension, you should get plans drawn up by an architect or building designer and get them approved by your local council’s building control team before starting work.
Plans & details for your extension should cover
- Foundations – ground conditions, depth, damp proofing and radon protection
- Floors and walls – structure and strengthening, insulation and sound proofing
- Roofs – flat or pitched, insulation, supports and beams, headroom
- Drainage – connections to existing drains, manholes and water supply
- Electrics – power and heating
- Windows and doors – ventilation and disabled accessibility
- Fire safety – escape routes and smoke detectors
In addition, if an extension is planned to be two or more storeys, the plans will also need to cover:
- Stairs, handrails and bannisters
- Sound-proofing – particularly in any sleeping accommodation
- Fire escape – from upper floors
Planning a house extension?
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