City of San Mateo Law Library
City of San Mateo Municipal Code.

27.04.144 DEN.

"Den" means a habitable space in a structure meeting the room dimension requirements of the most recent edition of the Building Code, as shall have been adopted by the City Council, with one completely open side that is directly accessible to a kitchen, living room or dining room. Loft areas will be considered as dens if the above criteria are met, except that half-walls will not count as required wall openings. The term den includes, but is not limited to, types of rooms such as libraries, studies, sitting rooms, and sewing rooms.