What do you call works in a flat after it has been built, that include making walls between the rooms, floor covers (parquetry, laminate, linoleum), ceiling, electrical wiring, sewerage, installing sanitary appliances (w.c. pan, washbowl, bath tub, shower cabin) and finishing (plastering, surfacing, wallpapers etc)?
In the UK they are referred to as the 'first fix' and 'second fix'.
The first fix is everything that must be done before the walls are plastered, such as wiring, main plumbing, internal walls, ceiling finish & flooring, but nothing 'above the surface'.
The second fix is sanitary fittings, bath, WC etc & electrical sockets, kitchen units & worktops etc., doors.
There's also increasingly commonly, a third fix, for more intricate installations - electronics & dust-sensitive equipment.
See http://en.wikipedia.org/wiki/First_fix_and_second_fix which has some AmE terms too; but I'd prefer someone more familiar with those to fill in the details.
In the US, after the foundation, framing, roof, sub-flooring, stairs, and outer walls are built, the work that comes next (electrical wiring, plumbing, interior walls and ceilings, floors, interior carpentry) is given various names.
plumbing rough-in (waste pipes/vents) but not the sinks, toilets, etc
electrical rough-in (running the wires from the breaker box, through the walls, to the outlets
drywall or plastering