Factory built structures

AN ACT Relating to adopting national standards for factory built 1
housing and commercial structures; amending RCW 43.22.470 and 2
43.22.480; and reenacting and amending RCW 43.22.450.3
BE IT ENACTED BY THE LEGISLATURE OF THE STATE OF WASHINGTON:4
Sec. 1. RCW 43.22.450 and 2019 c 352 s 4 and 2019 c 165 s 2 are 5
each reenacted and amended to read as follows: 6
Whenever used in RCW 43.22.450 through 43.22.490:7
(1) "Department" means the Washington state department of labor 8
and industries; 9
(2) "Approved" means approved by the department;10
(3) "Factory built housing" means any structure, including a 11
factory built tiny house with or without a chassis (wheels), designed 12
primarily for human occupancy other than a manufactured or mobile 13
home the structure or any room of which is either entirely or 14
substantially prefabricated or assembled at a place other than a 15
building site; 16
(4) "Install" means the assembly of factory built housing or 17
factory built commercial structures at a building site;18
(5) "Building site" means any tract, parcel or subdivision of 19
land upon which factory built housing or a factory built commercial 20
structure is installed or is to be installed; 21
Z-0432.3
HOUSE BILL 2151
State of Washington 69th Legislature 2026 Regular Session
By Representatives Manjarrez, Peterson, Ryu, Ramel, Doglio, Low,
Zahn, Wylie, Duerr, Thomas, Gregerson, Ormsby, Graham, and Donaghy;
by request of Department of Labor & Industries
Prefiled 12/16/25. Read first time 01/12/26. Referred to Committee
on Labor & Workplace Standards.
p. 1 HB 2151
(6) "Local enforcement agency" means any agency of the governing 1
body of any city, county, or state which enforces laws or ordinances 2
governing the construction of buildings; 3
(7) "Commercial structure" means a structure designed or used for 4
human habitation, or human occupancy for industrial, educational, 5
assembly, professional or commercial purposes; 6
(8) "Qualified inspection agency" means a nongovernmental entity 7
approved by the department to perform inspections ((under contract 8
for the department)). 9
Sec. 2. RCW 43.22.470 and 2019 c 165 s 1 are each amended to 10
read as follows: 11
The department shall have the authority to delegate all or part 12
of its duties of inspection to a local enforcement agency ((or a 13
qualified inspection agency)). 14
The rules adopted by the department under RCW 43.22.480 may 15
include options for inspections to be conducted by a qualified 16
inspection agency. Qualified inspection agencies shall be objective, 17
competent, and independent from the companies responsible for the 18
work being inspected. The qualified inspection agency will disclose 19
to the department any conflict of interest so that objectivity may be 20
confirmed. Qualified inspection agencies shall have adequate 21
equipment to perform the required inspections and shall employ 22
experienced personnel with appropriate certifications and knowledge 23
for the inspections being performed. Certification by the 24
international code council will be recognized as meeting this last 25
requirement. 26
Sec. 3. RCW 43.22.480 and 2008 c 181 s 204 are each amended to 27
read as follows: 28
(1) The department shall adopt and enforce rules that protect the 29
health, safety, and property of the people of this state by assuring 30
that all factory built housing or factory built commercial structures 31
are structurally sound and that the plumbing, heating, electrical, 32
and other components thereof are reasonably safe. The rules shall be 33
reasonably consistent with recognized and accepted principles of 34
safety and structural soundness, and in adopting the rules the 35
department shall consider, so far as practicable ((,)): The national 36
consensus standards published by the International Code Council, Inc. 37
for off-site construction planning, design, fabrication, and 38
p. 2 HB 2151
assembly; the national consensus standards published by the 1
International Code Council, Inc. for inspections and regulatory 2
compliance; the standards and specifications contained in the 3
((uniform)) international building, uniform plumbing, and 4
international mechanical codes, including the barrier free code and 5
the Washington energy code as adopted by the state building code 6
council pursuant to chapter 19.27A RCW, and the national electrical 7
code, including the state rules as adopted pursuant to chapter 19.28 8
RCW and published by the national fire protection association ; or, 9
when applicable, the temporary worker building code adopted under RCW 10
70.114A.081. 11
(2) The department shall set a schedule of fees which will cover 12
the costs incurred by the department in the administration and 13
enforcement of RCW 43.22.450 through 43.22.490. 14
(3) The director may adopt rules that provide for approval of a 15
plan that is certified as meeting state requirements or the 16
equivalent by a professional who is licensed or certified in a state 17
whose licensure or certification requirements meet or exceed 18
Washington requirements. 19
(4) During a state of emergency declared under RCW 43.06.010(12), 20
the governor may waive or suspend the collection of fees under this 21
section or any portion of this section or under any administrative 22
rule, and issue any orders to facilitate the operation of state or 23
local government or to promote and secure the safety and protection 24
of the civilian population. 25
--- END ---
p. 3 HB 2151