Chapter 51-50 State Building Code adoption and amendment of the 2021 edition of the International Building Code.

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-102, § 51-50-0722, filed 11/15/23, effective 3/16/24; WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0722, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 19-02-038, § 51-50-0722, filed 12/26/18, effective …

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0803, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 19-02-038, § 51-50-0803, filed 12/26/18, effective 7/1/19.]

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0902, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-0902, filed 2/1/13, effecti…

903.2.1.3 Group A-3. An automatic sprinkler system shall be provided throughout stories containing Group A-3 occupancies and throughout all stories from the Group A-3 occupancy to and including the levels of exit discharge serving that occupancy where one of the following conditi…

[F] 907.2.3 Group E. Group E occupancies shall be provided with a manual fire alarm system that initiates the occupant notification signal utilizing one of the following:1. An emergency voice/alarm communication system meeting the requirements of Section 907.5.2.2 and installed i…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-0908, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 16-03-064, § 51-50-0908, filed 1/19/16, effective 7/1/16. Statutory Authority: Chapters 19.27A, 19.27, and 34.05 RC…

909.21.12 Hoistway venting. Hoistway venting need not be provided for pressurized elevator shafts.909.21.13 Machine rooms. Elevator machine rooms shall be pressurized in accordance with this section unless separated from the hoistway shaft by construction in accordance with Secti…

911.1.2 Separation. The fire command center shall be separated from the remainder of the building by not less than a one 2-hour fire barrier constructed in accordance with Section 707 or horizontal assembly constructed in accordance with Section 711, or both.[Statutory Authority:…

913.2.1 Protection of fire pump rooms and access. Fire pumps shall be located in rooms that are separated from all other areas of the building by 2-hour fire barriers constructed in accordance with Section 707 or 2-hour horizontal assemblies constructed in accordance with Section…

915.1.1 Where required. Carbon monoxide detection shall be provided in Group I and R occupancies and in classrooms in Group E occupancies in the locations specified in Section 915.2 where any of the conditions in Sections 915.1.2 through 915.1.6 exist.EXCEPTIONS:1. R-2 occupancie…

918.1 General. In-building emergency responder communication enhancement system shall be provided in all new buildings in accordance with Section 510 of the International Fire Code.[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50…

1003.7 Elevators, escalators and moving walks. Elevators, escalators and moving walks shall not be used as a component of a required means of egress from any other part of the building.EXCEPTIONS:1. Elevators used as an accessible means of egress in accordance with Section 1009.4…

Table 1004.5Maximum Floor Area Allowance Per OccupantFUNCTION OF SPACEOCCUPANT LOAD FACTORaAccessory storage areas, mechanical equipment room300 grossAgricultural building300 grossAircraft hangars500 grossAirport terminal Baggage claim20 gross Baggage handling300 gross Concourse1…

1005.1 General. All portions of the means of egress system shall be sized in accordance with this section.EXCEPTIONS:1. Aisles and aisle accessways in rooms or spaces used for assembly purposes complying with Section 1030. 2. The capacity in inches, of means of egress components …

Table 1006.2.1Spaces with One Exit or Exit Access DoorwayOCCUPANCYMAXIMUM OCCUPANTLOAD OF SPACEMAXIMUM COMMON PATH OF EGRESS TRAVEL DISTANCE (feet)Without Sprinkler System (feet)With Sprinkler System (feet)Occupant LoadOL ≤ 30OL ˃ 30Ac, Eh, M49757575aB4910075100aF497575100aH-1, H…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1007, filed 1/19/16, effective 7/1/16; WSR 10-03-097, § 51-50-1007, filed 1/20/10, effective 7/1/10.]

1008.2.3 Exit discharge. This subsection not adopted.[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-103, § 51-50-1008, filed 12/13/19, effective 7/1/20; WSR 16-03-064, § 51-50-1008, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.…

1009.1 Accessible means of egress required.Accessiblemeans of egress shall comply with this section. Accessible spaces shall be provided with not less than one accessible means of egress. Where more than one means of egress is required by Section 1006.2 or 1006.3 from any accessi…

1010.2.4 Locks and latches. Locks and latches shall be permitted to prevent operation of doors where any of the following exists:1. Places of detention or restraint.2. Approved, listed locks without delayed egress shall be permitted in Group I-1 condition 2 assisted living facili…

1011.1 General. Stairways serving occupied portions of a building shall comply with the requirements of Sections 1011.2 through 1011.13. Alternating tread devices shall comply with Section 1011.14. Ship's ladders shall comply with Section 1011.15. Ladders shall comply with Sectio…

1012.1 Scope. The provisions of this section shall apply to ramps used as a component of a means of egress.EXCEPTIONS:1. Ramped aisles within assembly rooms or spaces shall comply with the provisions in Section 1030.13. 2. Curb ramps shall comply with ICC A117.1. 3. Vehicle ramps…

1014.2 Height and location. Handrails serving flights of stairways, ramps, stepped aisles, and ramped aisles shall comply with the provisions of Sections 1014.2.1 and 1014.2.2.1014.2.1 Height. Handrail height, measured above stair tread nosings, or finish surface of ramp slope, s…

1015.2 Where required.Guards shall be located along open-sided walking surfaces, including mezzanines, equipment platforms, lofts in accordance with Section 420.14, aisles, stairs, ramps and landings that are located more than 30 inches (762 mm) measured vertically to the floor o…

Table 1017.2Exit Access Travel DistanceaOccupancyWithout Sprinkler System (feet)With Sprinkler System (feet)A, E, F-1, M, R, S-1200e250bI-1Not Permitted250bB200300c F-2, S-2, U300400cH-1Not Permitted75dH-2Not Permitted100dH-3Not Permitted150dH-4Not Permitted175dH-5Not Permitted20…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 16-03-064, § 51-50-1018, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1018, filed 2/1/13, effective 7/1/13. Statutory Authority: RCW 19.27.031 an…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-22-115, § 51-50-1019, filed 10/31/23, effective 3/15/24; WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1019, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-21-021, § 51-50-1019, filed 10/9/20, effective 1…

1020.6 Air movement in corridors.Corridors shall not serve as supply, return, exhaust, relief, or ventilation air ducts.EXCEPTIONS:1. Use of a corridor as a source of makeup air for exhaust systems in rooms that open directly onto such corridors, including toilet rooms, bathrooms…

1023.12 Smokeproof enclosures. Where required by Section 403.5.4, 405.7.2 or 412.2.2.1, interior exit stairways and ramps shall be smokeproof enclosures in accordance with Section 909.20. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5,…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-10240, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-21-021, § 51-50-10240, filed 10/9/20, effective 11/9/20; WSR 20-01-090, § 51-50-10240, filed 12/12/19, effectiv…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-01-090, § 51-50-1028, filed 12/12/19, effective 7/1/20; WSR 16-03-064, § 51-50-1028, filed 1/19/16, effective 7/1/16.]

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-10300, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-01-090, § 51-50-10300, filed 12/12/19, effective 7/1/20.]

1101.2 Design. Buildings and facilities shall be designed and constructed to be accessible in accordance with this code and ICC A117.1, except those portions of ICC A117.1 amended by this section.1101.2.1 Reserved.1101.2.2 (ICC A117.1 Section 404.2.8) Door-opening force. Fire doo…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-11050, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-01-090, § 51-50-11050, filed 12/12/19, effective 7/1/20.]

1106.7 Location. Accessible parking spaces shall be located on the shortest accessible route of travel from adjacent parking to an accessible building entrance. In parking facilities that do not serve a particular building, accessible parking spaces shall be located on the shorte…

1107.2 Electrical vehicle charging stations. Electrical vehicle charging stations shall comply with Sections 1107.2.1 and 1107.2.2.EXCEPTION:Electrical vehicle charging stations provided to serve Group R-3 occupancies are not required to comply with this section.1107.2.1 Number o…

1108.6.2.2.1 Type A units. In Group R-2 Occupancies containing more than 10 dwelling units or sleeping units, at least 5 percent, but not less than one, of the units shall be a Type A unit. All units on a site shall be considered to determine the total number of units and the req…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-11090, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-21-021, § 51-50-11090, filed 10/9/20, effective 11/9/20; WSR 20-01-090, § 51-50-11090, filed 12/12/19, effectiv…

1110.2 Toilet and bathing facilities. Each toilet room and bathing room shall be accessible. Where a floor level is not required to be connected by an accessible route, the only toilet rooms or bathing rooms provided within the facility shall not be located on the inaccessible fl…

1202.1 General. Buildings shall be provided with natural ventilation in accordance with Section 1202.5, or mechanical ventilation in accordance with the International Mechanical Code. Ambulatory care facilities and Group I-2 occupancies shall be ventilated by mechanical means in …

1203.1 Equipment and systems. Interior spaces intended for human occupancy shall be provided with active or passive space-heating systems capable of maintaining an indoor temperature of not less than 68°F (20°C) at a point 3 feet (914 mm) above the floor on the design heating day…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1204, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 16-03-064, § 51-50-1204, filed 1/19/16, effective 7/1/16. Statutory Authority: RCW 19.27.031 and chapters 19.27 and…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1206, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-01-090, § 51-50-1206, filed 12/12/19, effective 7/1/20.]

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1207, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-01-090, § 51-50-1207, filed 12/12/19, effective 7/1/20.]

1208.3 Dwelling unit size. Dwelling units shall have a minimum of 190 square feet (17.7 m2) of habitable space.1208.4 Room area. Every dwelling unit shall have not less than one room that shall have not less than 120 square feet (11.2 m2) of net floor area. Sleeping units and oth…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1209, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 20-01-090, § 51-50-1209, filed 12/12/19, effective 7/1/20.]

1210.3.1 Water closet compartment. Each water closet utilized by the public or employees shall occupy a separate compartment with walls or partitions and a door enclosing the fixtures to ensure privacy. Gender-neutral toilet room water closet compartments shall be in accordance w…

1402.2 Weather protection. Exterior walls shall provide the building with a weather-resistant exterior wall envelope. The exterior wall envelope shall include flashing as described in Section 1404.4. The exterior wall envelope shall be designed and constructed in such a manner as…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1403, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24; WSR 21-06-035, § 51-50-1403, filed 2/23/21, effective 3/26/21; WSR 16-03-064, § 51-50-1403, filed 1/19/16, effective 7/…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 22-13-094, 23-12-103, and 23-20-023, § 51-50-1405, filed 6/14/22, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 13-04-067, § 51-50-1405, filed 2/1/13, effecti…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 21-06-035, § 51-50-1406, filed 2/23/21, effective 3/26/21; WSR 19-02-038, § 51-50-1406, filed 12/26/18, effective 7/1/19.]