Completion
Final inspections, snagging, and signing off
5 tasks in this phase
1
Building Control Final Inspection: What You Need for Sign-Off
How to prepare for the BCO final inspection on your extension. The certificates you need, why sign-off takes months (not weeks), and what to do when trades won't certify.
2 Free with email
Extension Snagging Checklist: How to Inspect Your Builder's Work
A systematic room-by-room snagging guide for completed extensions, covering structural, functional, and cosmetic defects, NHBC tolerances, crack assessment, and how to hold final payment to enforce completion.
3
Your Completion Certificate: Why It Matters and How to Get One
The building control completion certificate proves your extension complies with building regulations. Without it, selling or remortgaging becomes complicated. Here's how to get one, and what to do if you don't have one.
4
Updating Your Home Insurance After an Extension
Your extension changes your rebuild cost and risk profile. Failing to tell your insurer could void your entire policy. Here's exactly what to do, when to do it, and what your insurer needs to know.
5
Garden Reinstatement and External Works After Your Extension
Garden reinstatement after a UK extension typically costs £2,000–6,000. Correct sequencing, DPC rules, patio costs, drainage, and how to manage landscapers.