Cost of building a master bedroom and bathroom over a flat roof

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Posted by: from Montreal
9/19/2016 at 10:41:45 AM

I am considering building an additional room and bathroom over the roof of my property. I have a flat roof. I am considering something like a 170 sq feet bedroom and an 90 sq feet bath.

Very rougthly, what is the expected cost of it?

Thank you

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Date/Time9/19/2016 at 12:21:21 PM

You need 300 more square feet of space and it is going to cost appr. $145.00 per square foot, plus $8,000.00 more for the full bath. You are looking at a possible cost of $52K plus the 20 percent contingency.

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Henry in Montreal
Date/Time9/19/2016 at 12:38:28 PM

Thank you Tom!!

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Date/Time9/19/2016 at 6:06:31 PM

Cost to build a home addition vary from $200 per square foot on the cheapest end to $450 / sq. ft. or even more for custom top notch work. Accurate estimated can be provided only after analyzing architectural drawings with all technical details, calculating number of man-hours for completing the project and determining the total expenses for materials, fixtures and finishing products.

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