Building O scale houses on a budget - what comes first - L-W-H

A lot of houses are 24' deep, which would be 6" in O scale. How wide it would be would depend on when it was built and whether it has an attached garage. A house built in the 60's to late 70's might be 1000 to 1200 square feet or roughly 60 x 24 (15" x 6" in O scale). This would be a fairly common size for a bilevel, trilevel, or ranch house. A two story or cape cod house may be a bit smaller because it has the second level to add space, perhaps only 50' long (12 1/2" x 6").

Newer houses may be a bit larger, whereas older house would be smaller. The 24' dimension is fairly universal up til the 90's when engineered trusses started becoming more common (around here anyway. they may have been being used elsewhere earlier or later...) which allow spans longer than 12'

A standard exterior door is 80" tall x 36" wide. To scale that out divide each number by 48, which gives you 1 2/3" x 3/4" Since no one measures inches in thirds, I would say 1 5/8" x 3/4" would be plenty close enough for most work.

Hope this helps,

J White