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Question DetailsAsked on 8/8/2016

I'm wondering how much it would cost to do a 2 ft attic bump out for a cape cod running about 20 ft in Lex, KY

This would be for a master bedroom and closet. We may consider doing an additional bump out over an already existing addition that runs parallel to the main part of the house for a master bath. I'd like a general estimate for having it professionally done and for estimated costs on a DIY. No need to expand HVAC

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Note all numbers below are very rough BALLPARK figures - because so much depends on the details and materials of your house construction, whether you are extending off the eave or gable side of the roof, etc.


If you mean a bumpout through the roof like a gable but not extending beyond the existing walls, commonly $80-125/SF in normal cost areas, though up to as much as $150-200/SF in high-cost areas. If you mean bump out the wall as a 2 foot overhang, meaning redoing the roof over that entire area and cantilevering the bumpout outside the existing walls, commonly more in the $100-150/SF range.


BUMPOUT over addition or outside existing wall:

Depends somewhat of course on your existing wall and foundation construction and whether this bumpout will be on the top floor or not (lot more effort if there is a floor above the one being bumped out), and of course you would need an Architect to do plans for this to get a buildeing paermit and for contractors to bid to and build to.

The architect should be able to give you a good cost estimate for your specific construction and locale, but generally - if no floor above it and just bumping out a wall with a small roof extension, in the order of $80-125/SF is a common range. If there is an overlying floor then carrying that floor's loads down past the bumpout requires substantial beams or columns (though roofs loads have to be considered and carried around/through the bumpout in above case too), so more like $100-150 would be a typical range in all but very high cost areas, where it can run $200/SF plus. Though if you want the bumpout to be wide open - no supporting members coming down through it at all, then would tuypically be pushing the $150/SF plus range by the time all is said and done, because supporting columns for the 20' span beam commonly have to be carried all the way down to foundation level, and sometimes even need foundation changes as well.

From your description, sounds like you may actually mean an addition over the existing addition - not bumping-out a wall, but just building on an adjacent second story over the existing addition. This can run from $75-250/SF depending on area, quality of finishes, and complications of roofing intersections and such - commonly in the $100-150/SF range in moderate cost areas, up to $200/SF ballpark in higher-priced areas. - and of course over $200/SF is common if high-end, stone construction or stone faced, or ultra-modern (lots of steel and glass) construction.

You definitely need to get some drawings worked up by an Architect (who can also help you scope the job and develop a design that works with your desires and budget), then get multiple bids from Builders or Remodeling - General Contractors (your Search the List categories for this sort of work).

BTW - if you meant this entire bumpout is for a large master bath, the above numbers might be low by about $25-50/SF or so, because master baths cost a LOT more than all other parts of the house except the kitchen, on a SF basis.


DIY - commonly DIY costs for additions run about 25-50% or contracted cost, depending on whether you actually do basically all of it yourself or not and how many tools you have vaersus need to buy new or rent.

Answered 3 years ago by LCD

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