Sva tri termina su u sirokoj upotrebi. Ima mnogo hitaca na google.

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Note added at 25 mins (2005-10-11 21:26:34 GMT)
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Tehnicki crtez mi se mota po glavi, takodje, mada nisam sigurna da je to tacno resenje.

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Note added at 39 mins (2005-10-11 21:40:55 GMT)
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Molim vas ignorisite "kucu/stan. Upravo sam videla vase prethodno pitanje. Da li mozete zakljuciti iz konteksta da li se radi o skici samog apartmana ili se radi o nacrtu celog sprata.
Po definiciji, floorplan nije (samo) plan sprata kao sto bi se moglo pomisliti.
a set designer's drawing of the layout of the stage to show the spatial relationships between set pieces, placement of platforms, entrances, exits, and so on. The rehearsal room floor is usually taped to designate the various elements of the floorplan.
filmplus.org/thr/dic2.html

An architectural drawing showing the overall layout of a home. The size and shape of each room, as well as any optional configurations of those rooms, are shown on the floorplan. At J&C REMODELING offers several different plans from which to choose: single-story plans, two-story plans, etc.
remodelingsa.com/glossary.html

Floor plan (floorplan, floor-plan) in its original meaning is an architecture term, a diagram of a room, a building, or a level (floor) of a building as if seen from the above (i.e. a map). It can be considered a type of blueprint.
en.wikipedia.org/wiki/Floorplan

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Note added at 16 hrs 46 mins (2005-10-12 13:48:20 GMT)
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Dakle, plan/ skica/ nacrt apartmana.