# Land Use (GLU)

## Title 4. Zoning

### Subtitle 5. Accessory Dwelling Units

#### Section 4-501

(a) In this subtitle the following words have the meanings indicated.

(b)

  (1) "Accessory dwelling unit" means a secondary dwelling unit that is:

    (i) on the same lot, parcel, or tract as a primary single-family detached dwelling unit; and

    (ii) not greater than 75% of the size of and subordinate in use to the primary single-family detached dwelling unit.

  (2) "Accessory dwelling unit" includes a structure that is:

    (i) separate from the primary single-family detached dwelling unit; or

    (ii) attached as an addition to the primary single-family detached dwelling unit.

(c)

  (1) "Dwelling unit" means a single unit providing complete living facilities for at least one individual, including, at a minimum, provisions for sanitation, cooking, eating, and sleeping.

  (2) "Dwelling unit" does not include a unit in a multifamily residential building.

(d) "Utility" means water or sewer disposal services provided by:

  (1) a private company regulated under Division I of the Public Utilities Article;

  (2) the Washington Suburban Sanitary Commission regulated under Division II of the Public Utilities Article;

  (3) a sanitary commission regulated under Title 9, Subtitle 6 of the Environment Article; or

  (4) a municipal authority regulated under Title 9, Subtitle 7 of the Environment Article.

---

Md. Code Ann., Land Use (as displayed at mgaleg.maryland.gov, October 16, 2026)