In designing your addition or remodel, remember that corners cost money. Corners require extra foundation work, extra flooring, extra walls, extra sheetrock and additional finishing. While doors that are set in or rooms that extend out beyond the basic line of the house may ad an interesting design element, they could also require additional roof lines and peaks. Each of these elements of additional materials and work adds cost to your project. If you can keep your addition or remodel to the smallest number of corners, you will see a savings in the cost per square foot for your project. Consider the drawing below. The simple plan has four corners. Count the number of corners in the second plan.

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If you found this tip helpful, you might also want to read this:
Consider a second story instead of an addition that requires a new foundation
Make room dimensions multiples of 4 to save materials and save on labor
on cutting materials

Save on a foundation corner by bumping out for a closet, etc.