Washington Administrative Code

Plumbers certified under chapter 18.106 RCW and electricians certified under chapter 19.28 RCW are required for units constructed in Washington. For the purposes of construction at the manufacturing facility, the manufacturer is not required to be a licensed electrical contractor…

(1) If we determine you are in violation of this chapter, you will receive a notice of noncompliance.(2) If you disagree with our decision, you can send us a written request for a hearing, stating why you disagree.(3) After we receive your hearing request, we will:(a) Schedule a …

The factory assembled structures (FAS) board advises us on issues relating to structural, plumbing, mechanical, electrical, installation, inspections, and rules for factory-assembled structures. (See RCW 43.22.420.)[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [4…

We provide field technical service to factory-built housing and commercial structure manufacturers for an hourly fee. Field technical service may include an evaluation, consultation, plan examination, interpretation, and clarification of technical data relating to the application…

A person who believes that a structure or component does not meet the requirements of this chapter may register a complaint with the department. The complaint must be in writing and must specifically describe the alleged violations of this chapter. Upon receipt of the complaint, …

An applicant may apply for the use of alternate materials, alternate design and methods of construction different from the requirements of this chapter by filing a written request with the department.(1) Responsibilities of applicant. The applicant must submit in writing the foll…

(1) You must obtain insignia from us for each factory-built house, commercial structure and component sited in Washington state.(2) If you are a Washington state manufacturer, you do not need to purchase our insignia for your factory-built housing, commercial structures and compo…

(1) If you are applying for insignia for factory-built housing, commercial structures and components you must have your design plan approved and your units and components inspected and approved by us.(2) We will attach the insignia after:(a) We receive the required forms and fees…

Upon request, we will provide you with a packet of information that includes the required forms.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150F-0220, filed 10/23/96, effective 11/25/96.]

(1) If you are requesting insignia for units that you intend to manufacture under a new design plan, your completed application must include:(a) A completed design plan approval request form;(b) Two complete sets of design plans, specifications, engineering analysis, test procedu…

(1) If an insignia is lost or damaged after it is attached to your factory-built house, commercial structure, or component, you may obtain a replacement insignia.(2) You should contact us and provide the following information:(a) Your name, address, and telephone number;(b) The n…

Design plans for factory-built housing and commercial structures prior to installation at the building site in Washington must be approved when:(1) You build a new unit;(2) You modify an approved design plan through an addendum; or(3) You add options to an approved design plan th…

(1) Design plans can be approved by us or by a licensed professional or firm authorized by us (see WAC 296-150F-0420 and 296-150F-0430).(2) All electrical design plans for new or altered electrical installations for educational, institutional, health care facilities, and other bu…

All requests for design-plan approval must include:(1) A completed design-plan approval request form;(2) Two complete sets of design plans, specifications, engineering analysis, test procedures and results plus one additional set for each manufacturing location where the design p…

Structures built for temporary use must meet all the requirements of this chapter.[Statutory Authority: Chapter 43.22 RCW. WSR 12-15-061, § 296-150F-0325, filed 7/17/12, effective 9/1/12.]

(1) The engineering analysis must show that the structural design meets the requirements of this chapter.(2) An engineering analysis must be conducted according to accepted engineering practices and must be signed by a professional engineer or architect licensed in Washington sta…

(1) Tests to a design for a factory-built home or commercial structure must be witnessed by a professional engineer or architect licensed in Washington state.(2) Test reports must contain the following items:(a) A description of the methods or standards that applied to the test;(…

(1) Your design plan will be approved if it meets the requirements of this chapter.(2) We will send you an approved copy of the design plan with the design-plan approval number.(3) You must keep copies of the approved design plan at each location where a factory-built house, comm…

(1) You have ninety days to correct and resubmit your original design plan and send us the resubmittal fee after we notify you of plan deficiencies. After ninety days, your initial design plan is returned to you.(2) If you submit your corrected design plan after ninety days, you …

Once your design plan is approved, we will inspect each related factory-built house, commercial structure, or component.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150F-0400, filed 10/23/96, effecti…

Master design plan:(1) Your master design plan expires when there is a code change. You must submit new design plans for approval when there is a State Building Code cycle change. You may use your approved master design plans to order insignia as long as they comply with the appl…

You must have us approve an addendum to a design plan, if we initially approved your design plan.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150F-0415, filed 10/23/96, effective 11/25/96.]

(1) A professional engineer, architect, or firm licensed by the state of Washington according to the Engineers Registration Act, chapter 18.43 RCW and/or the Architects Registration Act, chapter 18.08 RCW; or(2) A professional engineer, architect, or firm licensed in another stat…

(1) Name, a copy of your certificate of registration or authority, and address of the professional engineer, architect, or firm; and(2) A description of the services the professional engineer, architect, or firm will provide in the areas of structural, fire and life safety, energ…

Within sixty days after you submit the information requested in WAC 296-150F-0430, we will send you a letter either approving or denying your authorization request.(1) If we approve your request, your name is added to the list of licensed professionals and firms authorized to app…

Your authorization to approve design plans is effective until your license expires, is revoked or suspended or until your authorization to approve plans is revoked or suspended in accordance with subsection (3) or (4) of this section.(1) You must notify us of your license renewal…

You must send us the following information in your approved design plan:(1) A completed departmental design plan approval request form;(2) A set of the design plan drawings, specifications, engineering analysis, and test results and procedures necessary for a complete code evalua…

(1) After we receive your approved design plans and information, we will check the design plans and information to reasonably assure they contain the documents and plan information outlined in our written guidelines for plan reviews as provided to approved licensed professionals.…

Yes. We will maintain a list of the licensed professionals and firms that are authorized to approve design plans for factory-built housing and commercial structures.[Statutory Authority: Chapter 43.22 RCW. WSR 23-09-024, § 296-150F-0480, filed 4/11/23, effective 4/11/23. Statutor…

(1) You must have the professional or firm approve an addendum to a design plan, if they initially approved your design plan.(2) If the professional or firm who approved your design plan is no longer on the department list you may have us approve your addendum.[Statutory Authorit…

Manufacturers are required to open and maintain, for the purpose of inspection payments, a deposit account. Funds, for the purpose of inspections performed by the department, must be withdrawn from the account and all inspections paid in full prior to an insignia being placed on …

(1) Before we issue an insignia, each factory-built house, commercial structure, and component must be inspected at the manufacturing location as many times as are required by the codes. (See WAC 296-150F-0600.) Inspections may include:(a) A "cover" inspection during construction…

(1) You must contact us, and we will let you know where your request for inspection should be submitted. Our address is noted in the definition of department.(2) We must receive in-state inspection requests at least seven calendar days prior to the date that you want the inspecti…

(1) If your factory-built house or commercial structure passes inspection and you have met the other requirements of this chapter, we will attach the insignia.(2) After our final inspection, we will send a notice to the local enforcement agency (NLEA) indicating whether further i…

(1) If you ask us to inspect a factory-built house or commercial structure within Washington state but you are not prepared when we arrive, you must pay the minimum inspection fee and travel. (See WAC 296-150F-3000.)(2) If you ask us to inspect a factory-built home, commercial st…

(1) The local enforcement agency (city or county) must approve the installation.(2) The local enforcement agency may also request a set of design plans and specifications for the unit from you.(3) After the unit is manufactured but before occupancy, we must inspect a factory-buil…

After we perform a final inspection of a factory-built, commercial structure, or component, we will send a notice to the local enforcement agency (NLEA) that:(1) Specifies what connections, standards, and incomplete items the local enforcement agency must check when the unit is i…

All used factory-built housing and commercial structures that are to be installed on a building site in Washington state must have an insignia of approval from the department prior to being installed on a building site or it must be approved by the local building official as a mo…

We consider used factory-built housing and commercial structures as new structures for purposes of insignia approval. To obtain insignia, you must:(1) Have the design plan approved by us (see WAC 296-150F-0300 through 296-150F-0480);(2) Purchase insignia (see WAC 296-150F-0200 th…

(1) All design, construction, installations, and alterations of factory-built housing, commercial structures, and components must conform with the following codes and the requirements of this chapter:(a) The State Building Code, chapter 19.27 RCW;Note:The International Building C…

Under the following conditions, the department will allow the required toilet facilities to be located in adjacent building(s):(1) The manufacturer shall note in the plan submittal that the requirements of IBC Chapter 29, Section 2902.1 and Section 2902.2, as amended by the state…

If the area served has an occupant load requiring only one exit and a building contains more than one area where each area is served by individual exits, and a personnel door is added between adjoining rooms, a personnel door in the partition wall will not be construed to create …

The department will only require that a tee be installed in an accessible location for the future addition of an expansion tank where one may be installed if required.[Statutory Authority: RCW 43.22.340 and 43.22.480. WSR 99-13-010, § 296-150F-0620, filed 6/4/99, effective 7/5/99…

In addition to the requirements in the state building code, the department of health has rules regulating primary and secondary schools in chapter 246-366 WAC. One of those requirements is that "Instructional areas shall have a minimum average ceiling height of 8 feet."[Statutory…

Where HVAC equipment manufacturers show multiple cubic feet per minute (CFM) ratings and/or multiple water gauge ratings, you must use the highest rated capacity.[Statutory Authority: RCW 43.22.340, 43.22.350, 43.22.355, 43.22.360, 43.22.400, 43.22.432, 43.22.433, 43.22.434, 43.2…

(1) If you are manufacturing factory-built housing and commercial structures at more than one location, approved design plans must be available at each manufacturing location.(2) You are required to send us the following information for each manufacturing location:(a) Company nam…

(1) If you are moving, notify us in writing prior to a change of business name or address.(2) Your notice must include the change of name and address.[Statutory Authority: RCW 43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150F…

(1) When a manufacturer changes ownership, the new owner must notify us in writing immediately.(2) A new owner may continue to manufacture the units according to a prior approved design plan if the prior owner releases the design plan.[Statutory Authority: RCW 43.22.340, [43.22.]…

(Effective until July 1, 2026)GENERAL INFORMATIONManufacture: Manufacturer # 1.Building use: 2.Building occupancy: 3.Type of construction: 4.Square footage of building: 5.Valuation of the building shall be based on the following:•Square footage of the building multiplied by the a…

This chapter is authorized by chapter 43.22A RCW, which requires the department to train and certify manufactured home installers and by chapter 43.22 RCW which authorizes the director of L&I to set installation standards for manufactured and mobile homes. For the purposes of thi…