(Amd) 1010.3 Buildings with one exit: Only one exit shall be required in:

1. Occupancies in the use groups shown in Table 1010.3, provided that the building has not more than one level below the level of exit discharge;
2. Occupancies in Use Group R-3; and
3. Occupancies in Use Group R-1 bed and breakfast establishments.

(Amd) 1010.4 Emergency escape and rescue: At least one operable window or exterior door approved for emergency escape and rescue shall be provided in the following locations:

1. In every sleeping room below the fourth story in occupancies in Use Groups R and I-1.
2. In day care occupancies regardless of use group in every room or space normally subject to client occupancy, other than bathrooms.
3. In every room or space greater than 250 square feet in Use Group E used for classroom or educational purposes or normally subject to student occupancy.

Each emergency escape and rescue window shall have a minimum net clear opening of 5.7 square feet. The net clear opening shall be at least 24 inches in height and at least 20 inches in width. The net clear opening dimensions shall be obtained by the normal operation of the window from the inside. Where windows are provided for emergency escape and rescue, the windows shall have the bottom of the clear opening not more than 44 inches above the floor. The clear opening shall permit a rectangular solid, with the minimum specified width and height that provides the required 5.7 square foot opening and a minimum depth of 20 inches to pass fully through the opening.

Bars, grilles or screens placed over emergency escape and rescue windows shall be releasable or removable from the inside without the use of a key, tool or force greater than that which is required for normal operation of the window.

1. An outside window or an exterior door for emergency escape and rescue is not required in buildings equipped throughout with an automatic sprinkler system in accordance with Section 906.2.1 or 906.2.2 as determined by use group.
2. In Use Groups R and I-1, an outside window or an exterior door for emergency escape and rescue is not required where the sleeping room is provided with a door to a corridor having access to two remote exits in opposite directions.
3. In existing buildings undergoing a change of occupancy to use group R-1 bed and breakfast establishments, the net clear opening dimensions shall be permitted to be obtained by removal of the sash without the use of a key or tool provided that the instructions for the removal of the sash are clearly posted on the inside of each guest room door.

(Amd) 1011.4 Enclosure: All corridors shall be fireresistance rated in accordance with Table 1011.4, based on the use group of the space and the total required capacity of all of the exits from the corridor. The corridor walls shall comply with Section 711.0.

1. A fireresistance rating is not required for corridors in an occupancy in Use Group E where each room that is occupied for instruction or assembly purposes has at least one-half of the required means of egress doors opening directly to the exterior of the building at ground level.
2. A fireresistance rating is not required for corridors contained within a dwelling unit or a guest room in an occupancy in Use Group R.
3. A fireresistance rating is not required for corridors in Use Group R-1 bed and breakfast establishments.

(Add) 1011.4.2.1 Use Group R-1 bed and breakfast establishments: Doors leading from guest rooms into corridors or hallways shall be equipped with self-closing devices.

(Amd) 1014.6 Treads and risers: The maximum riser height shall be 7 inches and the minimum riser height shall be 4 inches. The riser height shall be measured vertically between the leading edges of the adjacent treads. The minimum tread depth shall be 11 inches, measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread’s leading edge.

1. Winders in accordance with Section 1014.6.3.
2. Spiral stairways in accordance with Section 1014.6.4.
3. Circular stairways in accordance with Section 1014.6.5.
4. Alternating tread stairways in accordance with Section 1014.6.6.
5. Stairways serving as aisles in assembly seating areas where the stairway pitch or slope is set, for sightline reasons, by the slope of the adjacent seating area.
6. Any stairway replacing an existing stairway within a space where, because of existing construction, the pitch or slope cannot be reduced.
7. Existing stairways.
8. In occupancies in Use Group R-1 bed and breakfast establishments, in occupancies in Use Group R-3, within dwelling units in occupancies in Use Group R-2 and in occupancies in Use Group U which are accessory to an occupancy in Use Group R-3, the maximum riser height shall be 8 1/4 inches and the minimum tread depth shall be 9 inches. A nosing not less than 3/4 inches but not more than 1 1/4 inches shall be provided on stairways with solid risers where the tread depth is less than 11 inches.
9. Stairways in penal facilities serving guard towers, observation stations and control rooms not more than 250 square feet in area shall be permitted to have risers not exceeding 8 inches in height and treads not less than 9 inches in depth.

(Amd) 1014.6.3 Winders: Winders shall not be permitted in required means of egress stairways except stairways serving a single dwelling unit. Such winders shall have a tread depth of not less than 10 inches at a point not more than 12 inches from the side where the tread is narrower and the minimum tread depth shall not be less than 6 inches. The continuous handrail required by Section 1014.7 shall be located on the side where the tread is narrower.

Exception: Winders in accordance with this section shall be permitted in existing buildings undergoing a change of occupancy from Use Group R-3 to Use Group R-1 bed and breakfast establishments.

(Amd) 1014.7 Stairway guards and handrails: Stairways shall have continuous handrails on both sides. Guards shall be provided where required by Section 1005.5. Intermediate handrails are required so that all portions of the required width of stairs are within 30 inches of a handrail. On monumental stairs, handrails shall be located along the most direct path of egress travel. Handrails shall be provided for alternating tread stairways in accordance with Section 1014.6.6.1. Guards shall be constructed in accordance with Section 1021.0. Handrails shall be constructed in accordance with Section 1022.0.

1. Stairways with fewer than three risers are not required to have handrails where serving a single dwelling unit or where such stairways are not in an exit access corridor or aisle, exit or exit discharge.
2. Aisle stairs provided with a center handrail or serving seating on one side shall be equipped with a minimum of one handrail.
3. Stairways within a dwelling unit shall be equipped with a minimum of one handrail.
4. Spiral stairways shall be equipped with a minimum of one handrail.
5. Stairways within Use Group R-1 bed and breakfast establishments shall be equipped with a minimum of one handrail.

(Amd) 1014.11 Interior stairway enclosures: Interior exit stairways shall be enclosed with fire separation assemblies having a fireresistance rating of not less than 2 hours, except that such stairways in occupancies in Use Group A, B, E, F, H-4, I, M, R or S, which connect less than four stories, shall be enclosed with fire separation assemblies having a fireresistance rating of not less than 1 hour. An exit stairway enclosure shall not be used for any purpose other than means of egress. Openings in exit enclosures, other than unexposed exterior openings, shall be limited to those necessary for exit access to the enclosure from normally occupied spaces and for egress from the enclosure.

1. Stairways are not required to be enclosed in occupancies in Use Group A-5 in which all portions of the means of egress are essentially open to the outside.
2. Stairways serving and contained within a single residential dwelling unit in occupancies in Use Group R-2 or R-3 are not required to be enclosed.
3. Stairways that are not a required means of egress element are not required to be enclosed where such stairways comply with Section 713.3.
4. Stairways in open parking structures which serve only the parking structure are not required to be enclosed.
5. Stairways in occupancies in Use Group I-3 as provided for in Section 410.3.7.
6. Means of egress stairways as required by Section 412.5.4 are not required to be enclosed.
7. Stairways connecting the first and second floors of Use Group R-1 bed and breakfast establishments shall not be required to be enclosed. Stairways connecting the second and third floors in such occupancies shall be enclosed with fire separation assemblies having a fireresistance rating of not less than 1 hour. Stairways connecting the basement and the first floor in such occupancies shall be enclosed with fire partitions having a fireresistance rating of not less than ½ hour with 20 minute fireresistance rated door assemblies. Fireresistance rated assemblies at stairways in Use Group R-1 bed and breakfast establishments shall not be required to be supported by fireresistance rated construction.

(Amd) 1017.3 Size of doors: The minimum width of each door opening shall be sufficient for the occupant load thereof and shall provide a clear width of not less than 32 inches. The clear width of door openings at swinging doors shall be measured between the face of the door and the stop, with the door open 90 degrees. Where this section requires a minimum clear width of 32 inches and a door opening includes two door leafs without a mullion, one leaf shall provide a clear opening width of 32 inches. The maximum width of a swinging door leaf shall be 48 inches nominal. Means of egress doors in an occupancy in Use Group I-2 used for the movement of beds shall provide a clear width not less than 41 1/2 inches. The height of doors shall not be less than 80 inches.

1. A means of egress door serving a storage area of not more than 800 square feet and which is normally unoccupied shall have a maximum width of 10 feet.
2. The minimum and maximum width shall not apply to door openings that are not part of the required means of egress and are not required for accessibility in occupancies in Use Groups R-2 and R-3.
3. Door openings in resident sleeping rooms in occupancies in Use Group I-3 shall have a clear width of not less than 28 inches.
4. Door openings in closets less than 10 square feet in area shall not be limited by the minimum width.
5. Width of door leafs in revolving doors that comply with Section 1018.0 shall not be limited.
6. Door openings within a dwelling unit shall not be less than 78 inches in height.
7. Exterior door openings in dwelling units, other than the required exit door, shall not be less than 76 inches in height.
8. Interior egress doorways within a dwelling unit not required to be accessible shall have a minimum clear width of 29 3/4 inches. Door openings to storage closets and all other nonhabitable spaces within a dwelling unit not required to be accessible, shall not be limited by the minimum width.
9. Door openings within Type B dwelling units shall have a minimum clear width of 31 3/4 inches.
10. Doors within and accessing guest rooms in Use Group R-1 bed and breakfast establishments shall have a minimum clear width of 28 inches. Doors within and accessing bathrooms in Use Group R-1 bed and breakfast establishments shall have a minimum clear width of 24 inches.

(Amd) 1024.1 Artificial lighting: All means of egress in occupancies other than in Use Group R-3, the interior of dwelling units in occupancies in Use Group R-2 and Use Group U that are accessory structures to an occupancy in Use Group R-3, shall be equipped with artificial lighting facilities to provide the intensity of illumination herein prescribed continuously during the time that conditions of occupancy of the building require that the exits be available. All stairs within or serving a dwelling unit shall be provided with illumination and controls in accordance with Section 1207.0. Lighting shall also be provided to illuminate the exit discharge. Means of egress lighting in occupancies in Use Group R-2, other than lighting within a dwelling unit, shall be wired on a circuit independent of circuits within any dwelling unit. The disconnecting means and overcurrent protection device shall not be located within a dwelling unit or in such a way that access to such devices must be obtained by going through a dwelling unit.

Exception: Continuous illumination of the means of egress in Use Group R-1 bed and breakfast establishments shall not be required when illumination of the means of egress is initiated upon initiation of a fire alarm.

(Amd) 1024.4 Power source: Means of egress lighting in all buildings, rooms or spaces required to have more than one exit or exit access and in all Use Group R-1 bed and breakfast establishments shall be connected to an emergency electrical system that complies with Section 2706.0 to assure continued illumination for a duration of not less than 1 1/2 hours in case of emergency or primary power loss.