[12/8/2021]
Dwelling units, hotel units, housekeeping units, rooming units and dormitory units shall be arranged to provide privacy and be separate from other adjoining spaces.
A habitable room, other than a kitchen, shall be not less than 7 feet (2134 mm) in any plan dimension. Kitchens shall have a minimum clear passageway of 3 feet (914 mm) between counterfronts and appliances or counterfronts and walls.
Habitable spaces, hallways, corridors, laundry areas, bathrooms, toilet rooms and habitable basement areas shall have a minimum clear ceiling height of 7 feet (2134 mm).
Exceptions:
1. 
In one- and two-family dwellings, beams or girders spaced not less than 4 feet (1219 mm) on center and projecting not greater than 6 inches (152 mm) below the required ceiling height.
2. 
Basement rooms in one- and two-family dwellings occupied exclusively for laundry, study or recreation purposes, having a minimum ceiling height of 6 feet 8 inches (2033 mm) with a minimum clear height of 6 feet 4 inches (1932 mm) under beams, girders, ducts and similar obstructions.
3. 
Rooms occupied exclusively for sleeping, study or similar purposes and having a sloped ceiling over all or part of the room, with a minimum clear ceiling height of 7 feet (2134 mm) over not less than one-third of the required minimum floor area. In calculating the floor area of such rooms, only those portions of the floor area with a minimum clear ceiling height of 5 feet (1524 mm) shall be included.
Every bedroom and living room shall comply with the requirements of Sections 404.4.1 through 404.4.5.
404.4.1 
Room area. Every living room shall contain not less than 120 square feet (11.2 m2) and every bedroom shall contain not less than 70 square feet (6.5 m2) and every bedroom occupied by more than one person shall contain not less than 50 square feet (4.6 m2) of floor area for each occupant thereof.
404.4.2 
Access from bedrooms. Bedrooms shall not constitute the only means of access to other bedrooms or habitable spaces and shall not serve as the only means of egress from other habitable spaces.
Exception: Units that contain fewer than two bedrooms.
404.4.3 
Water closet accessibility. Every bedroom shall have access to not less than one water closet and one lavatory without passing through another bedroom. Every bedroom in a dwelling unit shall have access to not less than one water closet and lavatory located in the same story as the bedroom or an adjacent story.
404.4.4 
Prohibited occupancy. Kitchens and nonhabitable spaces shall not be used for sleeping purposes.
404.4.5 
Other requirements. Bedrooms shall comply with the applicable provisions of this code including, but not limited to, the light, ventilation, room area, ceiling height and room width requirements of this chapter; the plumbing facilities and water-heating facilities requirements of Chapter 5; the heating facilities and electrical receptacle requirements of Chapter 6; and the smoke detector and emergency escape requirements of Chapter 7.
Dwelling units shall not be occupied by more occupants than permitted by the minimum area requirements of Table 404.5.
Table 404.5
Minimum Area Requirements
Space
Minimum Area in Square Feet
1-2 occupants
3-5 occupants
6 or more occupants
Living rooma,b
120
120
150
Dining rooma,b
No requirement
80
100
Bedrooms
Shall comply with Section 404.4.1
For SI: 1 square foot = 0.0929 m2.
a.
See Section 404.5.2 for combined living room/dining room spaces.
b.
See Section 404.5.1 for limitations on determining the minimum occupancy area for sleeping purposes.
404.5.1 
Sleeping area. The minimum occupancy area required by Table 404.5 shall not be included as a sleeping area in determining the minimum occupancy area for sleeping purposes. Sleeping areas shall comply with Section 404.4.
404.5.2 
Combined spaces. Combined living room and dining room spaces shall comply with the requirements of Table 404.5 if the total area is equal to that required for separate rooms and if the space is located so as to function as a combination living room/dining room.
Nothing in this section shall prohibit an efficiency living unit from meeting the following requirements:
1. 
A unit occupied by not more than one occupant shall have a minimum clear floor area of 120 square feet (11.2 m2). A unit occupied by not more than two occupants shall have a minimum clear floor area of 220 square feet (20.4 m2). A unit occupied by three occupants shall have a minimum clear floor area of 320 square feet (29.7m2). These required areas shall be exclusive of the areas required by Items 2 and 3.
2. 
The unit shall be provided with a kitchen sink, cooking appliance and refrigeration facilities, each having a minimum clear working space of 30 inches (762 mm) in front. Light and ventilation conforming to this code shall be provided.
3. 
The unit shall be provided with a separate bathroom containing a water closet, lavatory and bathtub or shower.
4. 
The maximum number of occupants shall be three.
Spaces to be occupied for food preparation purposes shall contain suitable space and equipment to store, prepare and serve foods in a sanitary manner. There shall be adequate facilities and services for the sanitary disposal of food wastes and refuse, including facilities for temporary storage.