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Question DetailsAsked on 4/1/2017

Want to convert existing dble garage (24x24) into living space and raise roof above garage for sleeping space

The upper and lower levels to be connected by inside stairs, and have separate entrance. The upper level would be larger than the lower level footprint, roughly 24x40

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Assuming this is legal in your area from the aspect of number of living units, height and clearance from property line, requirements for a so-many car garage based on number of bedrooms, limits on square footage, and such restrictions for your lot, you would need at least a conceptual design from an architect, who can then give you a conceptual estimate.


Also - driveway parking spaces and septic tank and well capacity (if applicable) are commonly based on number of bedrooms too, so you might have to modify/upgrade there as well.


Assuming you can legally do it, and assuming no major fights regarding zoning or land use restrictions and no significant outdoor upgrades are needed, can run from about $50-100/SF to convert a garage to living space (more like $100-150 commonly if adding kitchen and/or bathroom) - and raising the roof for second story bedroom(s) is probably going to run you around $80-200 depending on roof type and quality of construction and finishes. Obviously, varies based on design and your local pricing and such - might get for 25% or so cheapder in very low cost areas, or as much as 50-100% more in very high cost major city areas like parts of Beantown, the Big Apple, Shakytown, or the real upsclae areas around NYC, LA, DC, etc. [Normal major additon/new construction cost in the US averages about $125-150/SF].


If you run into problems with the garage being eliminated, new garages - say if you extended one out to the side and ran the new second story over it) commonly run about $30-50/SF depending on area and on whether interior finished or not. And would somewhat reduce the cost in your case compared to a separate garage because the new garage would eliminate the overhang foundation for the second story, and the second story roof wouul eliminate a garage roof, so a new attached garage with the second story going over it should be less than the sum of the two based on above pricing.


You can also find a fair number of similar questions with some ballpark cost info in the Angies List > Project Cost Info link under Browse Projects, at lower left.

Answered 1 year ago by LCD




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