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Question DetailsAsked on 2/12/2018

what is estimated cost of a carriage house for two cars, upstairs apartment

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Depends on area of course - but cheapest (like deep South) to most expensive (NYC, CT, SFO, BOS high priced areas) commonly (for normal residential lot, not high-rise country) around $50 to 150-200/SF for the garage (unfinished - bare drywall) and $70-100 to 250-300/SF for the living space. VERY rough numbers. In the bulk of then country around $80-110/SF for the garage and $120-150/SF for the living space is a commonly seen number.

Of course, this does not include land, nor does it include any driveway/parking or septic upgrades required because of the added bedroom, nor special permitting costs if your area does not allow such a separate living space in your zoning classification. Generally an R-1 zoning does not allow it, R-2 commonly does assuming the existing house is a single family residence, not a duplex.

Note also that even if the zoning does allow the structure, generally in R-1 or R-2 a primary residence and an outbuilding apartment like this can only be used for family members or guest house, not commercial rental.

Answered 2 years ago by LCD

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