There are too many variables involved in a major remodeling project or room addition to come up with an average square foot price or expect a contractor to provide a firm free estimate. Not only must you consider structural aspects, such as load-bearing walls, location of plumbing and wiring, and possible changes to the roof line, but it will also depend on what kind of materials you want: Custom or pre-manufactured cabinets? Corian, tile, or Formica countertops? Carpet, hardwood, or vinyl floors? A whirlpool tub? Double sinks? Contractors may be able to give you a "rough" or "ballpark" bid based on what you think you want, but no one can give you a firm bid without working from a set of plans and specifications. The best way to get a reasonable price is to pay a contractor or designer to draw a set of plans and specifications and then collect competitive bids on it, preferably from at least three different contractors. Your designer will contact other professionals such as structural engineers, as needed, to draw plans that will meet building codes in order to apply for all the necessary building permits. Consider hiring a building designer, residential designer, or architect who specializes in residential remodels/additions. These specialists are trained to discuss your priorities and budget and design and draw your plans, including a list of specifications listing the materials you want in detail (by brand name and model number if possible). Kathy Maynard has been matching homeowners with home improvement contractors since 1990 and has written scores of articles advising homeowners how to find, hire and work with reputable service professionals. She also authors Weekend Warrior, a weekly home improvement column in The Sacramento Bee. | 
