Loft Electrics & Plumbing

First-fix services routed through a new floor before anything gets covered up

Getting electrics and plumbing into a converted loft is largely a first-fix job — running cabling, pipework and, where needed, relocating a header tank — completed and checked before floors and walls are closed up, since almost nothing is easily accessible again once the finish goes on.

First-fix electrics means running cabling for sockets, lighting circuits and any switches through the new floor and stud walls before plasterboard covers everything up — at this stage, routes are planned around the new floor joists and steelwork rather than simply drilled through wherever's convenient, since a converted loft floor is structural in a way an original loft floor never was. Plumbing follows a similar logic: if the conversion includes an en-suite or the loft previously housed the property's cold water header tank, that tank often needs relocating, since it's commonly positioned exactly where the new room's ceiling or a dormer wall is going to be. Running pipework up through an occupied house below the loft, rather than through an empty roof void, means routes have to be planned carefully around existing joists and ceilings, usually following the same route as the new staircase or a service void built in for the purpose. Second-fix work — fitting sockets, switches, light fittings and, where relevant, sanitaryware — happens later, once plastering is complete and dry, but it's the first-fix stage, hidden behind the walls and under the floor of the finished room, that determines whether everything works properly once it's all sealed up and impossible to easily alter.