Maryland Code, Housing and Community Development § 4-219

(a) A project or undertaking qualifies as a home improvement project if, by improvement, alteration, addition, or repair, it substantially protects or improves the basic liveability of a residential building that will be occupied in substantial part by families of limited income.

(b) A home improvement project for a residential building that contains more than four dwelling units is subject to the provisions of this subtitle that apply to a community development project.