To meet code (for a two-unit rental) we will need to move the exterior wall of a house next to a driveway in (note not out but in) by one foot (so the driveway can be 12 foot wide; it is currently 11ft wide). There is no plumbing on that exterior wall (that's about 33' along the driveway) but a little electrical in living room/bedroom space and 2 windows. The roof can stay as is since a second story overhang into the drive is allowed. The house is wood frame single story with stucco and was built in the 40's in California. It has a block foundation (one can crawl under the house). It would be great to get some idea of the range of costs associated with such a remodel.
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It would be nice to say "Oh you're doing a 33' sq. addition! ahem subtraction in this case. Here's the approximate price/sq. ft." Problem is those price/sq.foot calcs are based on the average cost of an addition - you're doing work that involves: significant temporary bracing, significant demolition, foundation, load bearing wall, electrical, shear wall, envelope (complicated to splice well with stucco), windows, and siding. A lot of work just to lose 33' sq. Not to mention that prices and quality of work vary widely in almost all parts of California. All that said, you're looking in the neighborhood of $20k for a bare bones deal.