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Reply to "Cost Ballpark in 2013 for Two-Story Addition in Bethesda/Chevy Chase"
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[quote=Anonymous][quote=Anonymous][quote=Anonymous]It also very much depends on quality of the building. For example, a high end home will have floor/ceiling joists at 12 inches on center instead of 16...you may also have insulated sheathing instead of standard OSB. How about engineered studs? These costs can easily add 10-15% to the cost of an addition. Also, a dry well can easily cost $30,000 for a large system. We did a 1,200 SF addition, all in cost was about $350k...the new construction (about 600 SF) was relatively insexpensive, the expansion to the eixsting home was much costlier.[/quote] This is inaccurate. High end homes do not have floor joists spaced at 12 inches on center. They have joists deeper than 12 inches and use wood I joists that are still spaced at 16 inches on center. [/quote] Technical term is tji, and in custom applications they are spaced 12 inches. 16 is minimum code requirements and is what is found in typical builder quality work.[/quote]
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