Second Fix
Plastering, fitting, finishing, and making it a room
7 tasks in this phase
1
Plastering Your Extension: What to Expect
Plastering costs £3,500–£5,500 for a typical extension. How boarding, skimming, and drying work, what fireboard is, and why your plasterer won't do it all in one visit.
2 Free with email
Second Fix Electrics: Sockets, Lights, and Final Wiring
What second fix electrics costs for a UK extension (£1,500–5,000), why the bill doubles, and how to get your electrical certificate without delays.
3
Second Fix Plumbing for Extensions
What second fix plumbing costs for a UK extension (£8,000–18,000), why bills grow, and how to get your Gas Safe certificate without a year-long fight.
4
Screeding: The Floor You Never Knew You Needed
Liquid screed costs £18–34/m²/m² and takes 8-12 weeks to dry. Your builder will underestimate both. Here's what to expect and how to manage it.
5
Flooring for Your Extension: Options, Costs, and Timing
LVT, porcelain tiles, or engineered wood for your extension? Costs from £50-75/m2 to £50-120/m2/m2, plus the moisture test that controls everything.
6
Tiling an Extension: Costs and Trade Accounts
Large-format porcelain floor tiling costs £80–120/m²/m² all-in. But buying tiles via your tiler's trade account can save nearly £1,000 on a typical extension floor. Here's how.
7
Decorating Your Extension: Painting and Finishing
Decoration for a typical extension costs £1,500–£2,500. How the mist coat works, why your decorator visits 4 times instead of once, and what to snag before you sign off.