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What documents do I need for extension building regulations?

Extension paperwork checklist covering drawings, calculations, inspections, certificates, drainage records and completion evidence.

Short answer

Most extensions need building regulations approval even when the planning route is permitted development. The key early decision is usually full plans versus building notice, with structure, foundations, insulation, drainage and ventilation settled before work is covered.

What changes the answer

Safer next step

Use full plans when you want detail checked before work starts, when the builder needs clear specifications, or where structure and energy details are not simple. A building notice may fit smaller straightforward domestic work, but it leaves more detail to be resolved on site.

Open Building regulations for extensions Use route checker Evidence to keep

Evidence checklist

Common questions

Does what documents do i need for extension building regulations? need building regulations approval?

Often yes, especially where the work changes structure, fire safety, insulation, ventilation, drainage, electrics or heating. The exact route depends on the specification and building control body.

Can planning permission and building regulations be separate?

Yes. Planning permission controls whether development is allowed in planning terms; building regulations deal with safety, energy, ventilation, drainage, structure and completion evidence.

What should I keep for sale or remortgage?

Keep the application reference, drawings, inspection notes, photos before work is covered, installer certificates and the completion certificate or equivalent evidence.

Next useful checks

Building Control Route Checker

Chooses likely next route: planning-first, full plans, building notice, competent person, regularisation, or specialist advice.