Building an extension

Building an extension

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If I want to build an extension to my home, will the building regulations apply? 

YES - Building regulations will generally apply if you want to build an extension to your home.

However, conservatories are normally exempt from building regulations when:

• They are built at ground level and are less than 30 square metres in floor area.
• The conservatory is separated from the house by external quality walls, doors or windows.
• There should be an independent heating system with separate temperature and on/off controls.
• Glazing and any fixed electrical installations comply with the applicable building regulations requirements.

You are advised not to construct conservatories where they will restrict ladder access to windows serving rooms in roof or loft conversions, particularly if any of the windows are intended to help escape or rescue if there is a fire.

Any new structural opening between the conservatory and the existing house will require building regulations approval, even if the conservatory itself is an exempt structure.

Building a porch at ground level and under 30 square metres in floor area is normally exempt from the need for building regulation approval.

This is provided that and any comply with the appropriate sections of building regulations.

For a porch to be exempt from building regulations approval:

• The front entrance door between the existing house and the new porch must remain in place.
• If the house has ramped or level access for disabled people, the porch must not adversely affect access.

Please note that you may require planning permission and you are advised to contact the Planning Duty Officer on 0208 753 3440 or email dutyplanner@lbhf.gov.uk for planning advice before commencing any building work.