I received a note from someone the other day asking how much it would cost to add a room to an existing house. She was interested in the “cost per square foot” for budgeting and planning purposes. She also asked what the best options might be. Figuring the cost of building a new house based on a cost per square foot is a tough thing to do because there are so many variables. Additions are even tougher to estimate. You could spend anywhere from $100 per foot to over $1000 per foot. It all depends on the complexity of the addition, the way it is built, the level of the appointments (finishes, fixtures, etc.), the construction materials used, and the location in which it is built.

Can you compare an addition of a simple room with no plumbing or special features with the cost of a kitchen addition full of cabinets, countertops, plumbing fixtures, and appliances? The kitchen addition could cost twice what the simple addition would cost based on the “cost per square foot.” What if an addition was to be built on flat land, clad in vinyl siding, and contained only a couple of simple windows. It would be much less expensive than an addition built on sloping land, clad in fieldstone, full of high-end windows, and included a soaring ceiling. Comparing the cost of these two projects would be like comparing apples and oranges. (more…)