Two two-way switches can only control a light from two points. A stairwell with three landings needs a third type of switch entirely. Here's what an intermediate switch actually does, where it has to sit in the circuit, and the one wiring mistake that stops the whole run working.
Two sockets that look almost identical carry completely different connections underneath. Here's what actually separates RJ11 telephone sockets from RJ45 data sockets, which one a home office job really needs, and the one spec decision that saves a second callout.
A wall-mounted TV with a visible cable trailing to a box on the shelf is an unfinished job, not a finished one. Here's when an HDMI wall socket actually earns its place, what it does to picture quality on longer runs, and which BG range to spec without paying for a finish nobody will see.
