This major group includes contractors who undertake specialized activities such as plumbing, painting, plastering, carpentering, etc. Also included are establishments primarily engaged in miscellaneous specialized construction activities. Special trade contractors for the most part perform their work at the site of construction, although they also may have shops where they perform work incidental to the site job:

    171.  Plumbing, heating (except electric) and air conditioning;

    172.  Painting, paper hanging and decorating;

    173.  Electrical work;

    174.  Masonry, stonework, tile setting and plastering;

    175.  Carpentering and flooring;

    176.  Roofing and sheet metal work;

    177.  Concrete work;

    178.  Water well drilling;

    179.  Miscellaneous specialized trade contractors. (Prior code § 11-20-017)