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First Fix

Electrics, plumbing, and insulation before the walls close up

6 tasks in this phase

Process infographic showing the electrical layout planning sequence: finalise room layout, map sockets and circuits, plan lighting zones, check consumer unit capacity, then brief the electrician
1
Electrical Layout Planning
How to plan your socket, switch, and lighting positions before the electrician arrives. Your room layout must be finalised first.
Coming soon
Process infographic showing the plumbing layout planning sequence: finalise room layout, choose boiler position, map supply and waste routes, coordinate with electrician, then brief the plumber
2
Plumbing Layout Planning
How to plan your water supply, heating, and waste pipe positions before the plumber arrives. Copper vs push-fit, boiler positioning, and the decisions that can't wait.
Coming soon
Process infographic showing first-fix electrics stages: consumer unit positioning, cable routing through walls, back box installation, circuit testing, and pre-plasterboard sign-off
3
First Fix Electrics: What Happens and What to Watch For
What first-fix electrics involves and the checks you must do before the plasterer arrives. Covers consumer unit placement, circuit types, Part P certification, and the communication failures that cause expensive rework.
Free with email
Process infographic showing the first fix plumbing workflow from layout plan through pipe installation, pressure testing, and sign-off before walls are closed
4
First Fix Plumbing: Pipes and Connections
What first fix plumbing covers in a UK extension, costs (£4,000 – £7,000), and the communication failures that turn a simple job into a 14-month paperwork nightmare.
Coming soon
Timeline infographic showing the UFH critical path from insulation through pipe laying, pressure testing, screed pour, curing, and tiling readiness
5
Underfloor Heating in Your Extension
Wet UFH planning, installation, and screed for single-storey extensions. Liquid screed costs £2,000 – £3,000, not the £800 – £1,500 your builder quoted.
Coming soon
Infographic showing the three insulation zones in an extension (roof, walls, floor) with U-value targets and material types for each zone
6
Insulation for Your Extension
How to get insulation right in your extension: types, U-values, building control, and what to check before plasterboard covers it all up.
Coming soon