With a few product substitutions and attention to detail, any new house can be made healthier at modest extra cost by Clint Good As a builder and architect with a strong interest in nontoxic homes, I've worked for many people who cannot tolerate some of the 500 or so chemicals present in the average house. These chemically hypersensitive people require homes built to extreme and often expensive specifications. But there is another group of people, not necessarily "chemically sensitive," who simply want to stay healthy. They want a reasonably priced "generic" healthy house — one that incorporates as many healthy products as possible, but without significantly raising the costs of construction. In 1986, I decided to design and build such a house on spec. The result was a 2,800-square-foot colonial with