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The cost of building a room addition depends on construction and type. For example, as of January 2009, adding a 10-by-15-foot bedroom costs from $3,750 to $7,500 if you do it yourself, and $7,500 to $22,500 if you hire a contractor. A 6-by-8-foot bathroom addition costs from $25,000 to $50,000 and is recommended only for professionals because of the plumbing.
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