Some jobs are notifiable — check which rules apply beforeyou start, not after the plaster's on.
Part P — Electrical Safety
Some domestic electrical work in England & Wales is 'notifiable' and must be signed off.
Party Wall etc. Act 1996
Working on or near a wall shared with a neighbour? You may need to serve formal notice first.
Building Regulations Part A — Structure
Anything affecting your home's structure — removing walls, cutting joists, new openings — needs Building Regs approval.