Who licenses plumbing in Alaska, and at what level
Alaska splits plumbing across two state departments, and a working plumbing company needs credentials from both. The Division of Corporations, Business and Professional Licensing at the Department of Commerce, Community, and Economic Development registers the business as a mechanical contractor and licenses the individual mechanical administrator who stands behind that registration. The Department of Labor and Workforce Development, Labor Standards and Safety, Mechanical Inspection Section issues the certificate of fitness that each plumber on the truck has to carry. The division states the division of labor plainly on its own mechanical administrator page: plumbers are regulated by the Department of Labor, Labor Standards and Safety, Mechanical Inspection Section. The Mechanical Inspection Section describes its role as enforcement of contractor registration and certificate of fitness requirements throughout Alaska, so the two agencies check each other's paperwork in the field. That produces three separate credentials for one plumbing company: a contractor registration held by the entity, a mechanical administrator license held by a named individual, and a certificate of fitness held by every plumber doing the work. Anchorage and Fairbanks then add municipal layers on top. Division contact for contractors is ConstructionContractors@Alaska.Gov and (907) 465-2050. The mechanical administrator program is at MechanicalAdministrators@Alaska.Gov on the same number. The Mechanical Inspection investigator takes unlicensed contractor reports at (907) 269-4917. The division states the license number format customers and inspectors use as a first check: valid license numbers contain either 6 numbers, or 4 letters plus at least 1 number. It also warns that mailed applications may take up to 4 to 6 weeks, so a plumbing company planning a move into Alaska should start the paperwork a full quarter before it intends to bid.
Sourcescommerce.alaska.gov 1labor.alaska.gov 2commerce.alaska.gov 3
Mechanical contractor registration: the business credential
AS 08.18.011 is the trigger: a person may not submit a bid or work as a contractor until that person has been issued a certificate of registration as a contractor by the department. Bidding counts, so the registration has to exist before the estimate goes out. The division defines mechanical contractors as contractors whose business operations involved plumbing, pipe fitting, sheet metal, heating, air conditioning, ventilating, or sprinkler and dry chemical fire protection trades, which puts a plumbing company in the mechanical category rather than the general or specialty ones. The registration is not issued to a plumbing company on its own merits. The mechanical contractor application states the condition in the department's own words: the department may not issue a certificate of registration as a mechanical contractor to an applicant unless the applicant is, or employs, a person currently licensed as a mechanical administrator. That is the hinge of the whole Alaska system. Lose the mechanical administrator and the business registration behind it stops being valid, which is why the division publishes a Change of Employer or Affiliation form and a Certification of Personal Supervision form for administrators. A general contractor registration is a different credential covering new home construction, commercial work and residential remodel, and a specialty registration covers work using not more than three trades. Neither substitutes for the mechanical one. Two neighboring categories are worth knowing so you do not register in the wrong one. A handyman contractor may perform work on projects with an aggregate contract of $10,000 or less, and a general contractor with a residential endorsement has completed a 16 hour cold climate course and passed the residential contractors endorsement exam. Neither covers a plumbing company's normal work, and neither substitutes for the mechanical administrator requirement.
Sourcescommerce.alaska.gov 1commerce.alaska.gov 2commerce.alaska.gov 3commerce.alaska.gov 4commerce.alaska.gov 5
Mechanical administrator: the two plumbing categories
The mechanical administrator license comes in seven categories, and two of them are plumbing. Unlimited Commercial and Industrial Plumbing, coded UCIP, covers plumbing, fixtures, fixture traps, and domestic water, waste, storm, and vent pipes under 12 AAC 39.212(b)(1). Residential Plumbing and Hydronic Heating, coded RPHH, covers all the work described in that same subsection but limited under 12 AAC 39.312(a) to a single family dwelling, or a duplex dwelling not exceeding three stories. The other five categories are Heating, Cooling and Process Piping, coded HCPP, Mechanical Systems Temperature Control, coded CNTL, Residential HVAC, coded RHVC, Unlimited HVAC and Sheet Metal, coded UHVCS, and Unlimited Refrigeration, coded UR. Pick the category against the work you actually sell, because RPHH stops at the duplex and three stories. A shop that does both houses and commercial buildings holds UCIP or holds both, and the division publishes a Mechanical Administrator Additional Category application, form 08-4905, for adding one later. The administrator is not a paper name. 12 AAC 39.902(a) makes a licensed mechanical administrator responsible for supervising all mechanical work performed under that administrator's license in accordance with AS 08.40.400, which is why the division also publishes a Certification of Personal Supervision form. Category choice also drives the exam you sit and the experience you have to document, since 12 AAC 39.202 and 12 AAC 39.302 set different requirements for UCIP and RPHH. Applying for the wrong one means reapplying with the $150.00 application fee again rather than amending in place.
Sourcescommerce.alaska.gov 1commerce.alaska.gov 2commerce.alaska.gov 3commerce.alaska.gov 4
What the state counts as experience
The two plumbing categories set different bars, and both are written as recent experience rather than lifetime experience. For Unlimited Commercial and Industrial Plumbing, 12 AAC 39.202 requires practical experience as a journeyman plumber for at least four of the six years immediately preceding the date of the application. The same regulation opens alternate doors: management experience, combined experience, an engineering degree with relevant work, or state professional engineer registration paired with management experience. For Residential Plumbing and Hydronic Heating, 12 AAC 39.302 requires practical experience as a journeyman in residential plumbing and hydronic heating work for at least two of the four years immediately preceding the date of the application. Read the windows carefully. Four of the last six years and two of the last four years both mean a plumber who left the tools years ago does not qualify on old hours alone. The journeyman experience the regulation counts is the same journeyman standing the Department of Labor certifies, which is 8,000 hours of legally obtained work experience under 8 AAC 90.130. In practice an Alaska plumbing business owner stacks the two systems: build 8,000 hours to the journeyman certificate of fitness, work as a journeyman, then apply for the mechanical administrator license that lets a company register. The regulation's alternate routes matter for owners who moved off the tools. A professional engineer registered in the state, paired with management experience, and an engineering degree paired with relevant work both appear in 12 AAC 39.202 alongside the journeyman route, which is the practical path for a mechanical firm whose principal never carried a plumber journeyman card.
Sourcescommerce.alaska.gov 1commerce.alaska.gov 2labor.alaska.gov 3
The mechanical administrator exam, fees and the credentials route
Mechanical administrator applications come in two forms. Form 08-4903 is licensure by examination and form 08-4904 is licensure by credentials. Both carry the same money: a $150.00 nonrefundable application fee plus a $200.00 license fee, $350.00 total. By examination, the applicant supplies a score of at least 70 percent on the examination administered by PSI Services, LLC, taken within 12 months prior to application. The division states that examination results are valid for one year, that test locations will be set up in Anchorage, Fairbanks, and Juneau, and that you must obtain approval from the State of Alaska before you can take the examination, so the approval comes first and the test second. By credentials, an out of state exam can count but does not clear the bar by itself. The division's warning on form 08-4904 is direct: passing an exam in another state does not guarantee qualification of an applicant for an Alaska license, and all other requirements under statute and regulation must be met. The other state's licensing agency sends verification of the examination on form 08-4904a, including the examination content outline, and the division compares it to the Alaska exam. The experience requirement in 12 AAC 39.202 or 12 AAC 39.302 still applies either way. The division publishes form 08-4902 for a change of employer or affiliation and form 08-4297 for certification of personal supervision, both of which exist because the administrator is tied to the registered business. An administrator leaving a plumbing company is a filing event for the company as well as for the individual.
Sourcescommerce.alaska.gov 1commerce.alaska.gov 2commerce.alaska.gov 3commerce.alaska.gov 4
Certificate of fitness: the credential every plumber carries
AS 18.62.070 requires a person engaged in plumbing subject to the uniform plumbing code to first obtain from the department the appropriate certificate of fitness in that trade. Four plumbing certificates exist. Plumber journeyman performs general plumbing work within property lines. Plumber restricted PG installs fuel and gas piping within property lines. Plumber restricted PU installs water service, building sewer, and storm drain piping. Plumber trainee works under the direct supervision of a journeyman. The trainee tier has a hard gate: under AS 18.62.050(d) the department may not issue a trainee level certificate unless the applicant is indentured in an apprenticeship program registered with the United States Department of Labor, Office of Apprenticeship, with an exception for the plumber utility trainee. Crew ratios are regulated too, at two plumber trainees for every certified plumber journeyman under 8 AAC 90.140 and 8 AAC 90.145. This certificate belongs to the person, travels with the person, and is separate from the company's registration. A plumbing company in Alaska therefore fails an inspection two different ways: an unregistered business, or a registered business running crew whose certificates lapsed. The restricted certificates are worth planning around rather than treating as consolation prizes. A plumber who holds restricted PG can install fuel and gas piping within property lines legally while accumulating hours, and a plumber who holds restricted PU can run water service, building sewer and storm drain piping. Both count toward the journeyman certificate later, though only up to the caps the regulations set. For a growing shop that is a way to put people on billable work while they build hours, provided the supervision ratios hold.
Sourceslabor.alaska.gov 1labor.alaska.gov 2labor.alaska.gov 3
The hours: what counts toward 8,000
The journeyman plumber certificate of fitness runs on 8 AAC 90.130 and requires a minimum of 8,000 hours of legally obtained work experience in plumbing work. Three substitution rules shape how fast a plumber gets there. Classroom hours from an apprenticeship program may substitute for up to 1,000 hours of work experience. A maximum of 500 hours from restricted PU work counts toward the requirement. A maximum of 2,000 hours from restricted PG work counts toward the requirement. So a plumber who spent years on gas piping alone brings at most 2,000 of those hours across, and a plumber who spent years on water and sewer service brings at most 500. The restricted certificates have their own numbers. Restricted PG under 8 AAC 90.135 requires a minimum of 2,000 hours installing fuel and gas piping within property lines plus a minimum of 4,000 hours of work experience in plumbing work, with up to 500 hours of accredited apprenticeship classroom substituting. Restricted PU under 8 AAC 90.137 requires a minimum of 1,000 hours installing water, sewer, or storm lines, with up to 125 hours of classroom substituting. The application collects this on Experience Verification Forms under 8 AAC 90.890. Because the caps differ so sharply, the fastest route to a journeyman certificate is broad plumbing work rather than a narrow specialty. A plumber kept on gas piping for three years arrives at the application with at most 2,000 countable hours from that period. Crew scheduling is therefore a licensing decision as much as a production decision.
Sourceslabor.alaska.gov 1labor.alaska.gov 2
The certificate of fitness exam, fees and term
Every certificate of fitness applicant tests. The minimum passing score for an examination under 8 AAC 90.115(c) is 70 percent, and an applicant who fails is eligible to retake the examination 30 days after the date of the failed examination under 8 AAC 90.115(d). The money is set in AS 18.62.030: a $50 application fee, $200 for issuance of a journeyman or trainee certificate, and $25 for a duplicate certificate. The plumbing application form repeats it as a $50 nonrefundable application fee with the $200 certificate fee charged after testing is complete. Terms differ sharply by tier. AS 18.62.020(a) makes a journeyman level certificate and renewal certificate valid for two years and a trainee level certificate and renewal certificate valid for six years. The renewal grace is generous but finite: under 8 AAC 90.180(b) the department will renew a standard certificate of fitness without reexamination if the certificate holder requests renewal not later than two years after the expiration date. Past that window the plumber tests again. A plumbing business owner tracking payroll should calendar each journeyman's two year date, because a lapsed certificate does not just affect that plumber, it removes a supervising journeyman from the trainee ratio. Plan the retake window into hiring. A failed exam costs 30 days before the next attempt under 8 AAC 90.115(d), which is a real gap if the business registration depends on having a certified journeyman on staff for supervision ratios.
Sourceslabor.alaska.gov 1labor.alaska.gov 2
Continuing education on both credentials
Alaska puts continuing education on the plumber and on the administrator, at different volumes. For the certificate of fitness, 8 AAC 90.192(c) requires an applicant for renewal of a plumber journeyman certificate to complete at least 16 hours of continuing education workshops, formal correspondence programs, individual study programs, or a combination approved by the department within the preceding 24 month period. The content is prescribed, not open. At least eight hours must cover significant changes or updates to the Uniform Plumbing Code, and not more than eight hours may be industry related. Since the journeyman certificate runs two years, that is 16 hours per certificate cycle for each journeyman plumber on the payroll, which is a real scheduling and payroll line for a shop with several plumbers. The mechanical administrator requirement is lighter. Under 12 AAC 39.410(b), a mechanical administrator must satisfactorily complete at least one eight hour continuing education workshop, or the equivalent, during the licensing period, covering applicable current codes. The division publishes an approved continuing education course list for mechanical administrators and a separate one for construction contractors. Two different agencies approve two different course lists, so hours taken for one credential do not automatically satisfy the other. The prescribed split on the plumber side is the part that trips people. Sixteen hours of general industry training does not satisfy 8 AAC 90.192(c), because at least eight of the sixteen have to cover significant changes or updates to the Uniform Plumbing Code and no more than eight may be industry related. Book the code hours first.
Sourceslabor.alaska.gov 1commerce.alaska.gov 2commerce.alaska.gov 3commerce.alaska.gov 4
Bonds and insurance, with the actual numbers
Alaska sets contractor bonds by statute rather than by discretion. AS 08.18.071(b) fixes a $25,000 bond for a general contractor, $20,000 for a general contractor with a residential endorsement doing exclusively residential work, $10,000 for a mechanical or specialty contractor or home inspector, and $5,000 for contractors on projects with an aggregate contract price of $10,000 or less. A plumbing company registering as a mechanical contractor sits at the $10,000 line, and the mechanical contractor application states it in those terms: a bond of $10,000.00 is required to be registered as a mechanical contractor. Insurance minimums come from AS 08.18.101(a)(2) and are printed on the application itself: public liability and property damage coverage of not less than $20,000 for damage to property, $50,000 for injury, including death, to any one person, and $100,000 for injury, including death, to more than one person. Those are floors set in 1970s era dollars and no commercial customer will accept them as a certificate of insurance, so read them as the registration gate and not as the coverage to buy. Workers compensation is separate and the division states the rule flatly: if a construction contractor has employees, they must hold workers compensation insurance. The division publishes two guidance documents on exactly this, a Bond and Insurance Documentation Guidance sheet and a Bond and Insurance Quick Facts sheet, both linked from its statutes and regulations page. Read them before the surety writes the bond, because the division rejects paperwork that names the wrong entity as principal.
Sourcescommerce.alaska.gov 1commerce.alaska.gov 2commerce.alaska.gov 3commerce.alaska.gov 4
Fees, renewal, and one date the state prints two ways
Registration money is the same for a mechanical contractor and a specialty contractor: a $100.00 nonrefundable application fee plus a $250.00 registration fee, $350.00 total. Mechanical administrator licensure runs a separate $150.00 plus $200.00, also $350.00. Certificate of fitness costs a separate $50 plus $200 per plumber. A single owner plumbing company standing up all three credentials is therefore paying $350.00, $350.00 and $250 in state charges before bond and insurance. The renewal date is where the state's own documents disagree and contractors should check before assuming. The division's contractor FAQ states that effective 10/1/2023, all General, Residential, Specialty, Mechanical and Handyman construction contractor professional license expiration dates will become 9/30 of even numbered years. The mechanical contractor application form, revised in September 2025, still prints that registrations expire on December 31 of even numbered years, regardless of the date of issuance, and the specialty application prints the same. Registrations are issued for a two year period either way. Renewals run through the division's MY LICENSE portal at ProfessionalLicense.Alaska.Gov/MYLICENSE, and the division warns that mailed applications may take up to 4 to 6 weeks. The safe practice is to treat the earlier of the two published dates as the deadline and confirm the expiration printed on the registration itself in MY LICENSE. A lapsed registration is not just a renewal problem, because AS 08.18.011 blocks bidding as well as working.
Sourcescommerce.alaska.gov 1commerce.alaska.gov 2commerce.alaska.gov 3labor.alaska.gov 4commerce.alaska.gov 5commerce.alaska.gov 6
Reciprocity, trade by trade
Alaska publishes no plumbing reciprocity list. There is no page naming states whose plumbing licenses Alaska accepts, and no agreement document for plumbing on either the division's site or the Department of Labor's. What exists instead is a credentials review, one applicant at a time, and only on the mechanical administrator license. Form 08-4904 is the licensure by credentials application, and the division carries the caution on the form: passing an exam in another state does not guarantee qualification of an applicant for an Alaska license, and all other requirements under statute and regulation must be met. The other state's agency sends verification on form 08-4904a, including the examination content outline, so the division compares content rather than accepting a license on its face. The experience windows in 12 AAC 39.202 and 12 AAC 39.302 still bind, which is the harder gate for someone who has been managing rather than installing. On the certificate of fitness side, the Department of Labor's regulations set the same examination and hour requirements for everyone, with no out of state waiver published in 8 AAC 90. A plumber moving to Alaska with 20 years elsewhere should plan on documenting 8,000 hours and sitting the exam. There is also no reciprocal path around the business registration itself. An out of state plumbing company bidding an Alaska project registers as a mechanical contractor, posts the $10,000 bond, carries the AS 08.18.101 insurance and employs a licensed mechanical administrator, exactly as an Alaska company does.
Sourcescommerce.alaska.gov 1commerce.alaska.gov 2commerce.alaska.gov 3labor.alaska.gov 4
What unregistered contracting and uncertified plumbing carry
Two statutes, two penalties. On the business side, AS 08.18.141(a) makes a knowing violation of the registration requirement after a prior conviction a class B misdemeanor. The practical damage usually lands before any court date, because AS 08.18.011 blocks bidding as well as working, which makes a contract signed by an unregistered contractor a problem for the customer and the prime as well as for the plumber. On the individual side, AS 18.62.080 reaches employer and employee alike: a person, either an employer or employee, who violates a provision of this chapter or of a regulation adopted under this chapter is guilty of a misdemeanor and, upon conviction, is punishable by a fine of not more than $500. That wording means a plumbing company that puts an uncertified person on plumbing work is exposed alongside the worker. The Mechanical Inspection Section describes its own role as enforcement of contractor registration and certificate of fitness requirements throughout Alaska and publishes a Contractor License Complaint form for the public to report unlicensed contractors, with an investigator at (907) 269-4917. AS 08.18.161 lists the exemptions, including owners working on their own property and owner builders limited to one structure per two years. The exemption list is worth reading before relying on it. AS 08.18.161 covers government representatives, court officers, public utilities, petroleum and gas operations, finished product sales, personal property work, material suppliers, property owners contracting with registered contractors, owners working on their own property, and commercial property owners using their own employees. None of them describe a plumbing company selling work to the public.
Sourcescommerce.alaska.gov 1labor.alaska.gov 2labor.alaska.gov 3
The advertising rule: AS 08.18.051(b)
Alaska is one of the states that writes the contractor's advertising obligations into statute, and the list is longer than most contractors realize. AS 08.18.051(b) requires that all advertising, contracts, correspondence, cards, signs, posters, papers, and documents prepared by a contractor for the contracting business must show the contractor's name, mailing address, and address of the contractor's principal place of business, and it adds that advertising and contracts must also include the contractor's registration number. Read the two tiers. Name, mailing address and principal place of business address go on essentially every piece of paper the business produces, including correspondence and business cards. The registration number is required on advertising and contracts specifically. The division publishes one relief valve: effective November 8, 2022, an advertisement that directs potential customers to the contractor's website or landing page satisfies this requirement, as long as all of the required information is contained on that website. So a truck wrap or a radio spot can point at the site, but the site then has to carry the name, the mailing address, the principal place of business address and the registration number. The division also publishes the number format check customers use: valid endorsement and registration numbers contain either 6 numbers, or 4 letters plus at least 1 number. Two details separate Alaska from most states. The statute reaches correspondence, cards and posters, not just paid advertising. And it requires two addresses, the mailing address and the address of the principal place of business, which many contractors treat as one line. Check the estimate template, the invoice template and the business card against the statute, not just the truck.
Sourcescommerce.alaska.gov 1commerce.alaska.gov 2
Anchorage adds its own license and its own hours
The Municipality of Anchorage runs a municipal contractor license on top of the state system. The municipality states that any individual or business engaged in construction within the Municipality of Anchorage service area is required to obtain a Municipal Contractors License, that each license is valid for a maximum of two years, and that it expires on February 14. State registration comes first, and the municipality directs applicants to the state occupational licensing office before applying locally. Anchorage then licenses people as well as companies. Any individual working in the plumbing or mechanical trade is required to obtain a qualification, or fitness, card, valid for a maximum of two years. The hour thresholds are municipal and they are higher than the state journeyman standard: plumbing contractor 12,000 hours, plumbing journeyman 8,000 hours. Anchorage charges $90 to examine a plumbing contractor candidate and $60 for a journeyman, then $400 for the contractor card and $140 for the journeyman card. A plumbing company working Anchorage therefore tracks four expiration dates: the state registration, the mechanical administrator license, each plumber's state certificate of fitness, and the February 14 municipal license along with each municipal qualification card. The municipality directs applicants to state registration first and gives (907) 269-8160 for that step, so the sequence is state registration, then municipal license, then qualification cards for the crew. Budget the card fees per person rather than per company.
Sourcesmuni.org 1commerce.alaska.gov 2
Fairbanks, and how a customer verifies you
Fairbanks runs its own examination rather than accepting the state credential alone. The City of Fairbanks Building Department administers a master plumber and mechanical exam for a Plumbing Contractor Qualification, or Master Plumber, license, and requires an application and registration fee of $200 completed and paid at the Fairbanks Building Department no later than 4 p.m. one week prior to the exam date. The city bases part of the exam on the 2020 edition of the Fairbanks Administrative Code and publishes a Master Plumbers License Application and Renewal form. For verification, the state runs a single public search covering both the contractor registration and the mechanical administrator license, at commerce.alaska.gov/cbp/main, linked from the construction contractors page as the license search. A customer checking a plumbing company should confirm three records rather than one: the business registration as a mechanical contractor, the mechanical administrator license standing behind it, and the certificate of fitness of the plumber who shows up. Bond and insurance status matter too, since AS 08.18.071 and AS 08.18.101 tie both to the registration. Keeping the AS 08.18.051(b) details correct on the website makes that check pass quickly, because the customer can match the registration number on the site to the number in the state search. Contractors bidding across Alaska should assume each borough and city may add its own examination or license rather than accepting the state credential alone, and should check before quoting.
Sourcesfairbanks.gov 1commerce.alaska.gov 2commerce.alaska.gov 3