This U.S. industry comprises general contractor establishments primarily responsible for the entire construction of new single-family housing, such as single-family detached houses and town houses or row houses where each housing unit

(1) is separated from its neighbors by a ground-to-roof wall and

(2) has no housing units constructed above or below.

This industry includes general contractors responsible for the on-site assembly of modular and
prefabricated houses. Single-family housing design-build firms and single-family construction management firms acting as general contractors are included in this industry.