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Do I need building regs approval as well as planning permission for the rear extension?
Yes — planning permission and Building Regulations are two separate approvals. Planning is about what you build (size, appearance, impact on neighbours). Building Regs are about how you build it (structure, insulation, fire safety, drainage, etc.). For your ~34 m² rear/side extension you'll almost certainly need a full plans application with your local Building Control body, submitted before work starts. Your structural engineer's calcs will form part of it.
What's the typical sequence between the two?
A common sequence for a project like yours: 1. Concept design → Planning application (8 weeks decision) 2. Detailed/technical design in parallel with the planning decision 3. Structural design + Building Regs full plans submission 4. Party wall awards finalised 5. Tender to builders (2–4 weeks) 6. Start on site You're currently between steps 3 and 4, so the next things to lock down are the steel order and the party wall award with no. 47.