It could save you thousands of dollars on a small house addition to build it on posts and beams (like the support for a deck) rather than laying a concrete slab foundation. Your ability to do this will depend upon local building code requirements and the intended use of the new room. If the use of the new space will not include heavy items like appliances or bookcases, this solution may work for you. Attention must be given to ensuring adequate support for the dead and live weight the structure must hold. Once this is done, and the appropriate choices of wood, beam width, post positioning, etc. are made, you may discover that the cost of your addition is significantly less than you expect.
If you found this tip helpful, you might also want to read this:
 Home Additions Cost
Home Addition Calculators
Use exterior wall sheathing that has a finished surface instead of a layer of sheathing that is then covered with siding, stucco or other finish
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