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Question DetailsAsked on 1/8/2013

I'm looking to build a shed dormer on one side of a house and would like a ROUGH estimate on the cost of the exterior finish only.

The home is located in Milton, MA. This link contains a drawing on the lower left showing current dimensions of the structure:

The dormer would span nearly the entire length of the right side and probably contain about four windows. It would be recessed front and back by about one rafter so the overall length would be about 38 feet. The width measured from the roof peak would be about 12 feet in order to meet town setback requirements. At this point I'm just looking for a VERY ROUGH IDEA of what it would cost to build this shed dormer to the point where it would be finished entirely on the OUTSIDE only. Thanks!


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2 Answers



Good question! There are certainly a lot of variables to consider when building on to an existing home. Type of foundation, stud spacing, 2x4 or 2x6 studs, wood floor or slab, trusses or joist & rafters, type of windows, etc...

But if you want a ROUGH guess for an unfinished room 12'x38' (456 sq.ft.) you can figure $40-$60 per sq.ft. to determine a budget. So you can plan on spending somewhere between $18,000 and $27,000 depending on the options you choose. (And depending on how badly the contractor needs the work)

Answered 7 years ago by Vern


Hi, nimblejack.

We often recommend getting up to three written estimates for any big project. Be sure to consult Angie's List for remodeling contractors near you. In the Boston area, more than 800 contractors are highly rated.


Answered 7 years ago by HughV

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