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Question DetailsAsked on 2/2/2016

Estimated cost to build a 12' x 28' addition w/full basement in Dedham, MA, 2 rooms-new entry & dinning.

Adding on to 1 level Ranch. Removing existing 3 season porch on cinder block foundation and constructing new 1 level connected addition/full basement with new entry and dining off of kitchen .Will need 3' variance from city..375 sqft of asbestos shingles to be removed. Need 1 new Entry door, 5 double hung windows, stairway to basement, 3 baseboards.Total sqft 336 plus 4' x 12' front open porch. Have basic plans.

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Depends of course on local building code provisions, how hard that 3 foot setback variance is to get (which is yours or an Architect or Planner action, not a general Contractor's responsibility), whether some or all the existing cinder block foundation can be reused in the structure, etc - but in your area I would expect it to be around $150-200/SF in a pretty plain bare-bones construction, or more likely $200-250/SF fully finished in "good" quality construction and finishes.

If you have plans from an Architect (which you will undoubtedly need to get a building permit, and want as scope of work documents for bidders and to incorporate in the final construction contract), he/she should be able to do a preliminary construction (or project) cost estimate for you.

Of course, the actual "going rate" for your specific configuration and layout and materials will be something you do not really know till you get 3 or more responsive bids for the work.

Answered 4 years ago by LCD

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