What began quite innocently as a pet project turned into a national movement for Anders Lewendal, the Bozeman, Mont., builder who has since gained wide acclaim for constructing a house made entirely from U.S.-made products.

Initially, Lewendal set out to build an “efficient, affordable and environmentally healthy” home for a client whose daughter has cystic fibrosis. In researching the building materials and parts required for the project, Lewendal was struck with this idea: Why not go for all-American parts and materials.