Room Additions- What will my project cost in Central Ohio

Home Builder with N.J.W. Construction Inc


We have a common question in our initial meetings about the price of a project whether it is a new addition, kitchen or bathroom. These prices are based on our experience for Central Ohio.

Most customers have a pre-conceived idea of how much their room addition will cost.  The truth is that most customers guess the price of their addition to be 50% to 80% of the actual cost.  A standard room addition will initially run 125.00 per square foot up to 150.00 per square foot with the size and design being the variable. We have had quite a few additions be in the 200.00 plus per square foot range. The bases for the difference in square foot price has many variables, being existing home structure and design for tying in the new addition, complexity of the roof design, what the exterior of the existing home is made of and finally what the interior of the addition will have in it. We also have had customers decrease the size of the addition to bring the price down but when the addition is so small, there is a point at which decreasing the size makes no difference.  It takes a certain amount of effort to start and run a project and also to meet minimums for subcontractors and suppliers. The plus for small additions is to increase its size will have a very small effect on the price. Typically we refer to a small size being 150 sq feet or less with these being in the 200.00 per square foot price range. The 125.00 to 150.00 dollar price range usually works in the 200 square foot and above in size. The price also increases with the square footage price with the adding of exterior projects such as porches, decks and landscaping packages. This of course does not add to the square footage of the project but does drive up the square footage price. This pricing does not include any bathrooms or kitchens in it either as this is its own project inside the addition.  What we consider to be a more value-oriented room addition contains standards of common building practice such as a crawl space, vinyl siding, standard roof design with basic tie in to the existing house, standard interior of carpet, wood trim and vinyl windows.  Also, in the past six months, costs have come down on their own due to the economical downturn.  At NJW Construction, we like to meet with our customers and review their project and make any economic design suggestions that we see as well as review our process. We started offering 3-d renderings of projects a couple of years ago and this has helped with customer satisfaction at the end of the project (please note our testimonials & process page) as well as tie in the economical design changes. We also suggest that they check out any companies that are bidding on the project through BBB, Angies List, National Association of Remodeling and or the BIA. This helps customers get a builder in good standing and this simple step would stop most of consumers being deceived.


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N. Joel Walter

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