5.) Sunroom Addition: 51% recoup on an average investment of $73,000. How do you like that for some depressing math? Sunroom additions fall into that category of inefficient use of space, right along with bathroom additions. If you’ve got a hankering for room addition investment, throw your dollars into a more valuable project like guest room suite for the sibling that won’t go away or a baby nursery that can be easily modified into a child’s room.

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