Iowa · Plumbing licensing · official-source guide
Iowa licenses plumbing through the Plumbing and Mechanical Systems Board at the Department of Inspections, Appeals, and Licensing, a board that also covers HVAC, refrigeration, sheet metal and hydronics. It licenses individuals as apprentice, journeyperson and master, licenses the contracting business separately, and requires a second registration under Iowa Code chapter 91C. Contractors carry a $5,000 bond and $500,000 liability insurance.
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Plumbing and Mechanical Systems Board, Iowa Department of Inspections, Appeals, and LicensingState-level license
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Verify a licenseVerified against agency sources on 2026-09-11. Rules and fees change; confirm with the named authority before relying on this guide.
Iowa does not run a plumbing-only board. The Plumbing and Mechanical Systems Board sits inside the Department of Inspections, Appeals, and Licensing and licenses five disciplines under one statute: plumbing, mechanical, HVAC-refrigeration, sheet metal and hydronic systems. The statute is Iowa Code chapter 105, titled the Iowa Plumber, Mechanical Professional, and Contractor Licensing Act, and the board's rules are 481 Iowa Administrative Code chapters 425 through 432. The board's certificate holder address for insurance filings is the Bureau of Environmental Health and Contractor, DIAL, 6200 Park Ave Ste 100, Des Moines, IA 50321. Iowa Code 105.2(15) defines plumbing broadly enough to matter in scoping: potable water building supply and distribution pipes, all plumbing fixtures and traps, all drainage and vent pipes, building drains, building sewers, storm sewers and storm drains within the property lines, including the connection to sanitary sewer, storm sewer and domestic water mains, and expressly including medical gas piping systems, fuel gas piping, water heaters and vents, and all natural, propane, liquid propane or other gas lines associated with any component of a plumbing system. Because one board covers five trades, a company that does both plumbing and HVAC needs licensure in each discipline it sells, and Iowa Code 105.9(5)(b) reduces a combined license fee by thirty percent of the sum of the separate fees.
Iowa is one of the states where holding the trade license is not enough to operate. Every construction contractor doing business in the state must also register under Iowa Code chapter 91C, and a plumbing company needs both. Iowa Code 105.18(2)(d)(1) writes the link into the license itself: a contractor license application must include proof of workers compensation insurance coverage, proof of unemployment insurance compliance and, for out-of-state contractors, a bond as described in chapter 91C. Rule 481 IAC 431.3(5) states the ongoing duty, that a contractor will maintain registration as a contractor with the director pursuant to Iowa Code chapter 91C by providing the board with the necessary information. Iowa Code 91C.1(4) then merges the paperwork: a contractor licensed under chapter 105 registers under chapter 91C in conjunction with the contractor licensing process, and the department collects both the registration and licensing applications as one combined application. That merger is why the board's own fee table prints a contractor license fee and a contractor registration fee side by side. It is also why an Iowa plumbing contractor carries two numbers, a PMSB contractor license number and a DIAL contractor registration number, and why the state runs two different public search tools. Getting one and forgetting the other is the most common Iowa compliance gap for a company crossing the state line.
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Iowa Code 105.18(2) sets four levels in each discipline. An apprentice files an application meeting the board's minimum requirements, certifies that the person will work under the supervision of a licensed journeyperson or master in the applicable discipline, and must be enrolled in an applicable apprentice program registered with the United States Department of Labor office of apprenticeship. A journeyperson files an application, passes the state journeyperson licensing examination in the discipline, and gives the board evidence of at least four years of practical experience as an apprentice, which since January 1, 2010 must be in a program registered with the federal office of apprenticeship. A master files an application, passes the state master examination in the discipline, and shows the board that the person has previously been a licensed journeyperson or master in that discipline. A contractor files an application, maintains a permanent place of business, and holds a master license or employs at least one person holding a master license. A plumbing license allows an individual to perform work defined as plumbing; a mechanical license covers HVAC, refrigeration, sheet metal and hydronic; an HVAC-refrigeration license covers those two; a hydronic license covers hydronic; a sheet metal license covers sheet metal. The board also issues special restricted sublicenses, including the disconnect and reconnect plumbing technician specialty, the hearth systems specialty, the service technician HVAC specialty and private school or college routine maintenance, plus a medical gas piping certification.
Rule 481 IAC 431.3(1) is the rule that decides whether an Iowa plumbing company can keep operating when a key person leaves. A contractor must hold or employ a master licensee in each discipline in which the contractor does business, and without prior board approval a contractor will not knowingly use a master licensee who is simultaneously the master of record for another contractor in that discipline. Rule 481 IAC 431.4(1) states the same limit from the master's side: a master may only be a master of record for one contractor in any particular discipline at any one time, unless the contractor or the master gets prior board approval. The definition in 481 IAC 431.1 makes the master of record responsible for the proper designing, installing and repairing of the systems and actively in charge of that work for the contractor. If the master of record's employment ends, the relationship is discontinued, or the master license lapses, is suspended, revoked, expired or otherwise invalidated, rule 481 IAC 431.3(1)(a) lets the contractor keep providing services for up to six months without naming a new master of record. To use that grace period the contractor must notify the board of the loss within 30 days from the date the master of record is no longer associated with the contractor, absent exigent circumstances. Rule 481 IAC 431.3(6) separately requires a permanent place of business whose address is on file, with any change reported within 30 days.
Sourceslegis.iowa.gov
Iowa does not use a national testing chain for this board. The board's published examination page names Kirkwood Community College as the board's approved examination provider, with testing sites around the state. The sequence is fixed by rule 481 IAC 429.6(3): the applicant submits a board-approved examination application, online or on paper, a minimum of 15 business days before taking an examination, and is notified and issued an examination entrance letter once the application is approved. Exam approval lasts one year from the approval letter, and within that window a candidate may test as many times as necessary, paying the vendor's fee each attempt. The board charges an examination application fee of $35.00 per trade examination under rule 481 IAC 428.1(4), and the board's master license page states the examination fee paid to Kirkwood as $95.00 per attempt. Apprentices may apply to sit up to six months before completing the 48 month requirement, which matches rule 481 IAC 429.6(3)(j) allowing a journeyperson examination applicant to apply up to 12 months ahead. Rule 481 IAC 429.6(2) requires a written, proctored examination specific to each discipline and states that examinations are not subject to review by applicants. Rule 481 IAC 429.6(4) sets an expiry on success: an applicant who passes must apply for licensure in that discipline and level within two years of notification, or the passing score lapses and the examination must be retaken.
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Iowa Code 105.19(1) requires an applicant for a contractor license, or for renewal of an active contractor license, to provide evidence of a public liability insurance policy and a surety bond in an amount determined sufficient by the board by rule. The board set both numbers in rule 481 IAC 431.3. Subrule 431.3(3) requires a person or entity holding a contractor license to maintain during the licensing period a surety bond issued by an entity licensed to do business in Iowa in a minimum amount of $5,000. Subrule 431.3(4) requires public liability insurance issued by an entity licensed to do business in Iowa in a minimum amount of $500,000. Iowa Code 105.19(2) allocates the duty: a sole proprietor obtains both personally, while a contractor operating as an employee or owner of a legal entity must have the entity obtain them, covering all plumbing or mechanical work performed by that entity. Both instruments must carry a provision requiring the issuer to give the board ten days written notice before cancellation, and Iowa Code 105.19(3) requires the certificate to stay on file with the board. The board's contractor license page adds the detail that trips up applicants who copy a form from another state: the bond must identify the contractor's customers as the protected party, not the state or the board, and the insurance certificate holder must be listed as the Bureau of Environmental Health and Contractor at the DIAL address.
Iowa licenses run three years, so the numbers look large next to annual states. Rule 481 IAC 428.1(1) sets three year initial license fees: apprentice $50, journeyperson $180, master $240, contractor $250, medical gas pipe certificate $75, inactive license $50 and special restricted license $50. Reciprocal licenses and licenses obtained by verification are priced at apprentice $50, journeyperson $180 and master $240 under subrule 428.1(2). Renewal fees at subrule 428.1(3) repeat those figures. The board's own fee page prints the same schedule and adds the paired numbers a contractor pays: a contractor license renewal of $250.00 plus a contractor registration renewal of $150.00, and a combined new contractor application and registration of $400.00 when filed in the first half of a licensing period. Fees for licenses issued for less than three years are prorated with a one-sixth deduction for each six month period. Other charges: the examination application fee is $35, written verification of licensee status is $20, a paper application costs $25 plus the license fee, a returned check is $25, the disciplinary hearing fee is a maximum of $75, combining an HVAC-refrigeration or hydronics license into a mechanical license is $50, and a petition for eligibility determination is $25. Rule 481 IAC 428.3 waives fees for a first time Iowa applicant whose household income does not exceed 200 percent of the federal poverty guidelines, and waives an initial application fee and one renewal fee within five years of an honorable or general discharge.
Iowa Code 105.20(1) makes every license under the chapter a three year license, and Iowa Code 105.9(7)(a) sets a common renewal date every three years. The board's licensing page states the current period as July 1, 2026 through June 30, 2029, and its licensure page tells licensees that PMSB licenses expire June 30 but are valid through August 31, with the advice to renew in July to avoid fees. Iowa Code 105.20(2) asks for the renewal application and fee at least thirty days before the expiration date. The late schedule in rule 481 IAC 428.1(5) has three steps. A licensee who renews on or before the following July 31 pays the renewal fee and no late fee. A licensee who renews between August 1 and August 31 pays a $60 late fee plus the renewal fee. A licensee who renews after August 31 and on or before the following June 30 pays a $100 late fee plus the renewal fee. The board's fee page adds the operational consequence that the rule does not spell out: a licensee renewing after September 1 is not eligible to work until the renewal is processed, while one renewing in July or August is. Past one year, the board's contractor page is blunt, stating that a contractor license expired more than one year ago can no longer be renewed. Iowa Code 105.20(4) then requires a reinstatement process by rule instead.
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Iowa Code 105.20(5)(a) sets the floor. The basic continuing education requirement for renewal is completion, during the immediately preceding license term, of the number of classroom hours the board requires in board approved courses or seminars, and the board shall require at least eight classroom hours of instruction during each three year licensing term. Paragraph (b) gives a licensee a thirty day grace period after the end of the term to finish everything needed for renewal without penalty. The board's continuing education page states how it applies the statute in practice. Eight continuing education hours are the typical requirement to renew a single license, and someone holding multiple mechanical discipline licenses needs fourteen. At least half of the hours must be in person and up to half may be online. Only approved courses taught by approved instructors count. The requirement reaches journeyperson and master licensees in both the single and multiple mechanical cases, and it reaches the specialty licenses, including the disconnect and reconnect plumbing technician, the service technician HVAC specialty, hearth systems, and private school or college routine maintenance. Medical gas piping installers are the stated exception and do not need continuing education hours. The board publishes its list of approved instructors as a downloadable document. Because the term is three years rather than one, an Iowa contractor who waits until spring of the third year has to find approved in person seats in a narrow window.
Iowa Code 105.21 allows the board to license without examination a nonresident applicant licensed under another state's plumbing or mechanical professional statutes where that state has similar licensing requirements and grants the same reciprocal privileges to Iowa licensees, and directs the board to adopt rules for those relations. Rule 481 IAC 430.2 says only that the board may enter licensing reciprocity agreements in accordance with the statute. Rule 481 IAC 430.3(1) sets the four conditions for a reciprocal license: the applicant is a nonresident of Iowa, the applicant holds a valid license in a discipline from an issuing jurisdiction with which the board has entered into a reciprocity agreement, the applicant has paid the fees in 481 chapter 428, the applicant meets the minimum qualifications in rule 481 IAC 429.4, and the applicant agrees to comply with Iowa law and rules. Note the first condition: reciprocity under this chapter is for nonresidents. The rule for people moving to Iowa is different. Rule 481 IAC 430.4 covers licensure by verification under Iowa Code 272C.12, which requires proof of Iowa residency, or a military permanent change of station, a verification form sent directly from the transferring jurisdiction, and proof of passing the applicable Iowa licensing examination. The reciprocal fee schedule at rule 481 IAC 428.1(2) prices apprentice, journeyperson and master licenses only, and lists no contractor license.
The registration side is a separate statute with its own numbers. Iowa Code 91C.1(1)(a) defines a contractor as a person engaged in the business of construction, and excludes a person who earns less than two thousand dollars annually from construction or who works only on the person's own property. Iowa Code 91C.2 sets three conditions: compliance with Iowa workers compensation law with annual evidence of coverage, relief under section 87.11 or a statement that coverage is not required; possession of an employer account number or a special contractor number issued by the department of workforce development under chapter 96; and, for an out-of-state contractor, either a surety bond of twenty-five thousand dollars filed with the department under section 91C.7 or a statement that the contractor is prequalified to bid on Department of Transportation projects under section 314.1. Iowa Code 91C.4 caps the fee, stating that the director shall prescribe the registration fee, which shall not exceed fifty dollars per year. That cap is why the board's three year cycle prices registration renewal at $150.00. Iowa Code 91C.1(3) exempts from the fee a contractor whose application shows the contractor is self-employed, does not pay more than two thousand dollars annually to employ others, and does not work with or for other contractors in the same phases of construction. DIAL's contractor page restates the trigger as earning at least $2,000 a year from construction.
Iowa Code 105.10 states the prohibition, that a person shall not operate as a contractor or install or repair plumbing, mechanical, HVAC, refrigeration, sheet metal or hydronic systems without the required license or certification, subject to the exceptions in 105.11. Iowa Code 105.26 lets a court restrain by injunction anyone practicing without a required license. Iowa Code 105.27(1) gives the board a civil penalty not to exceed five thousand dollars per offense, with each day of a continued violation a separate offense, except that offenses arising from the same or common facts count as a single offense, and requires written notice and the chance to request a hearing within thirty days. Unpaid penalties go to the attorney general, who may sue to recover the amount plus reasonable attorney fees and costs. Iowa Code 105.22 lists the discipline grounds, and three of them are marketing behaviour: knowingly making misleading, deceptive, untrue or fraudulent misrepresentations in the practice of the profession, with proof of actual injury not required; fraud in representations as to skill or ability; and use of untruthful or improbable statements in advertisements. Aiding and abetting an unlicensed person is a separate ground. The registration side carries its own citations. Iowa Code 91C.8 lets the director cite a contractor for failing to register, for incomplete or inaccurate registration information, or for an out-of-state contractor's failure to file the bond, with administrative penalties of not more than five hundred dollars for a first violation and not more than five thousand dollars for each violation after that.
Iowa Code 105.25 is the advertising section, and contractors should read all four subsections because two of them create offenses. Subsection 1 restricts the claim itself: only a person duly licensed under the chapter may advertise the fact that the person is licensed as a contractor or as a plumbing, mechanical, HVAC-refrigeration, sheet metal or hydronic professional by the state of Iowa. Subsection 2 is the display rule: all written advertisements distributed in this state by a person engaged in the business of designing, installing or repairing plumbing, HVAC, refrigeration, sheet metal or hydronic systems shall include the listing of the contractor license number, as applicable. It is the contractor license number, not the master or journeyperson number, and the trigger is written advertisements distributed in Iowa, which reaches mailers, flyers, print and written digital advertising placed into the state. Subsection 3 makes a person who fraudulently claims to be a licensed contractor or licensed professional under the chapter, in writing, cards, signs, circulars, advertisements or other communications, guilty of a simple misdemeanor. Subsection 4 makes a person who fraudulently lists a license number in connection with advertising, or who falsely displays a license number, guilty of a simple misdemeanor. What Iowa does not do is also worth knowing. Chapter 105 specifies no minimum letter height, no required prefix before the number, and no rule requiring the number on vehicles or on written estimates. The enforceable requirements are the claim rule and the number in written advertising.
Sourceslegis.iowa.gov
The display duty is in the rules rather than the statute. Rule 481 IAC 431.3(2) requires a person holding a contractor license to keep the current license certificate publicly displayed in the primary place in which the person practices. That is a physical certificate in the office or shop, publicly displayed, not filed in a drawer, and it sits in the same rule that carries the bond, insurance, registration, permanent place of business and supervision duties, all of which the rule frames as obligations whose violation may give rise to disciplinary action. The rest of rule 481 IAC 431.3 is worth auditing alongside it. Subrule 431.3(7) says a contractor will not knowingly allow an employee to perform work covered under Iowa Code chapter 105 without the applicable license. Subrule 431.3(8) says a contractor will not knowingly allow an apprentice employed by the contractor to perform covered work without supervision by a master or journeyperson who is also employed by the contractor and licensed in the discipline the apprentice is working in. Read with Iowa Code 105.22(7), which makes aiding and abetting unlicensed practice a ground for discipline, and Iowa Code 105.27, which prices a violation at up to five thousand dollars per offense, the display and supervision rules put the contractor licensee personally on the hook for how the crew is staffed and how the office looks to an inspector.
Iowa Code 105.17(1) is unusually direct. The chapter's licensing provisions supersede and preempt all plumbing, mechanical, HVAC-refrigeration, sheet metal, hydronic and contracting licensing provisions of all governmental subdivisions, and paragraph (a) states that on July 1, 2009 all plumbing and mechanical licensing provisions promulgated by any governmental subdivision became null and void, except reciprocal licenses under Iowa Code 105.21. Paragraph (b) adds that on and after July 1, 2008 a governmental subdivision shall not prohibit a state licensee from performing services the state license covers, and shall not enforce its own plumbing and mechanical licensing provisions against a state licensee. A governmental subdivision means any city, county or combination of the two under Iowa Code 105.2(5). What cities kept is the money and the inspection. Iowa Code 105.17(2) and Iowa Code 105.9(4) both preserve the right to assess and collect construction permit fees and inspection fees for work performed by plumbing and mechanical professionals. Cedar Rapids states the practical result on its own contractor licensing page: in order for contractors to perform work and be issued a permit in the City of Cedar Rapids, licensing with the State of Iowa is required, and it points plumbing contractors to the state board. So in Des Moines or Cedar Rapids the plan is one state license, one state registration, and then a permit application to the city, not a second local trade license.
Iowa gives a customer two searches, and both matter because the two credentials are separate. The board's public search portal covers licensees regulated through the state's regulatory programs system, and the board links to it from its own contractor license page. It is where a homeowner confirms that the company holds an active PMSB contractor license and that the individual on the truck holds the journeyperson or master license for the discipline. The second search is the contractor registration lookup on the state labor portal, which DIAL links from its contractor registration page, and it confirms the chapter 91C registration that Iowa Code 91C.5(1) requires the director to make public. That section directs the director to issue each registered contractor an identifying public registration number, to compile records of names and public registration numbers, and to treat those records and the complete registration information as public records, taking steps as necessary to facilitate access by government agencies and the general public. Section 91C.5(2) requires the director to revoke a registration number when the contractor stops meeting the conditions, after a fact-finding interview. A customer standing in a shop has a third check with no website at all: rule 481 IAC 431.3(2) requires the current contractor license certificate to be publicly displayed in the primary place the contractor practices, and Iowa Code 105.25(2) requires the contractor license number to appear on the written advertisement that brought the customer in.
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These are common details other guides publish about Iowa, but we could not verify them from the agency source. Confirm them directly before relying on them.
The Plumbing and Mechanical Systems Board, part of the Department of Inspections, Appeals, and Licensing. One board covers plumbing, mechanical, HVAC-refrigeration, sheet metal and hydronic systems under Iowa Code chapter 105 and rules at 481 Iowa Administrative Code chapters 425 through 432.
Both, and then some. Individuals are licensed by grade as apprentice, journeyperson or master in a discipline. The business holds a contractor license, which requires a master license or an employed master of record plus a permanent place of business. The business must also register separately under Iowa Code chapter 91C.
Rule 481 IAC 431.3(3) requires a surety bond of at least $5,000 and rule 481 IAC 431.3(4) requires public liability insurance of at least $500,000, both issued by an entity licensed in Iowa and both carrying a ten day cancellation notice to the board. The board requires the bond to name customers as the protected party.
Yes, a second one. Iowa Code 91C.2(3) requires an out-of-state contractor to file a surety bond of twenty-five thousand dollars with the department, or to provide a statement that the contractor is prequalified to bid on Iowa Department of Transportation projects under section 314.1.
Iowa Code 105.18(2)(b)(1)(c) requires evidence of at least four years of practical experience as an apprentice, and since January 1, 2010 that apprenticeship must be in a program registered by the United States Department of Labor office of apprenticeship. You must also pass the state journeyperson examination in the discipline.
Iowa Code 105.18(2)(c) requires the applicant to pass the state master examination for the discipline and to show the board that the person has previously been a licensed journeyperson or master in that discipline. The board's master license page describes the qualifying experience as a journeyperson license with a minimum of two years of work experience.
The board's examination page names Kirkwood Community College as the board's approved examination provider. The board charges a $35.00 examination application fee per trade examination, and the board's master license page states the examination fee paid to Kirkwood as $95.00 per attempt.
Rule 481 IAC 428.1 sets three year fees: apprentice $50, journeyperson $180, master $240, contractor $250, medical gas pipe certificate $75, special restricted license $50. Contractor registration renewal adds $150.00. A paper application adds $25 and written verification of license status is $20.
Iowa Code 105.20(5) requires at least eight classroom hours of board approved instruction during each three year licensing term. The board's page states eight hours for a single license and fourteen for multiple mechanical discipline licenses, with at least half of the hours in person. Medical gas piping installers are exempt.
Licenses run three years and expire June 30. Renewing on or before July 31 costs the renewal fee only. Between August 1 and August 31 adds a $60 late fee. After August 31 adds a $100 late fee, and the board's fee page states the licensee is not eligible to work at that point. A contractor license expired more than one year cannot be renewed.
Yes. Iowa Code 105.25(2) requires all written advertisements distributed in Iowa by a person in the business of designing, installing or repairing plumbing, HVAC, refrigeration, sheet metal or hydronic systems to include the listing of the contractor license number. Chapter 105 sets no letter height, no prefix and no vehicle lettering rule.
Iowa Code 105.25(4) makes a person who fraudulently lists a license number in connection with advertising, or who falsely displays a license number, guilty of a simple misdemeanor. Iowa Code 105.25(3) applies the same to fraudulently claiming to be licensed in writing, cards, signs, circulars, advertisements or other communications.
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