Size of build mode square answerred by original The SIms

Lucky you, being able to see things that way! About the only time I can do that close to successfully is guesstimating the size of actual buildings from outside, taking a standard window as 1 square and going from there. When working from plans I nearly always use period Victorian, and they almost always are in feet only, say 20 x 18 or whatever. I often go with 2.5 feet per square side, which works reasonably well most of the time and provides a larger house with more sim movement room.