What is an plumbing contractor license, and how do you get one?
A plumbing contractor licence authorises a business to offer, bid and contract plumbing work for the public. In nearly every state the company must designate a qualifying individual — normally a master plumber — who is responsible for the work performed under the licence, and must file a surety bond and maintain liability and workers' compensation insurance. Many states add a business and law examination, and some require financial evidence. First-line construction supervisors, the category plumbing contractors are counted in, earn a $79,920 median.
- Hold or employ a master plumber as qualifying individual.
- Register the business entity and set up payroll and accounting.
- Pass the business and law examination where required.
- File the surety bond and insurance certificates.
- Apply to the state board or each local authority, then renew.
How to get a plumbing contractor license
- 1
Secure a qualifying master plumber
Hold the master licence yourself or employ a master as an owner, officer or full-time employee. Everything else depends on this, and most states limit how many businesses one master may qualify, so a nominal arrangement will not survive scrutiny.
- 2
Set up the business properly
Register the entity, obtain a federal tax identification number and put accounting and payroll in place. Several states review financial statements or apply a net worth test before issuing a contractor licence.
- 3
Pass the business and law examination
Where required, sit the examination on contract formation, licensing regulations, lien and payment law, employment and tax obligations, insurance and bonding, estimating and financial management. It is normally open book against the state contractor manual.
- 4
File the bond and insurance certificates
Obtain a surety bond in the amount the authority sets and file it with certificates of general liability and workers' compensation cover. Both must stay continuously in force; a lapse suspends the licence and reinstatement is slow.
- 5
Apply and keep the licence in place
Submit the application to the state board or to each city and county where licensing is local. Renew on the authority's cycle, keep the qualifier's code continuing education current, and notify the board immediately if the qualifying master leaves.
Plumbing Contractor license requirements
The requirements are commercial as much as technical, because this licence regulates a business. To license a plumbing company you generally need:
Qualifying master plumber
A licensed master who is an owner, officer or full-time employee and takes responsibility for the company's plumbing work. Most states restrict a master to qualifying one business.
Surety bond
Filed with the licensing authority to protect consumers and, in some states, secure payment obligations. The amount is set by the state or local authority and differs substantially.
Insurance
General liability at the minimum the authority sets, plus workers' compensation where you employ staff. Certificates are filed with the application and must be maintained continuously.
Business and law examination
Required in many states, covering contracts, licensing regulations, lien law, employment and tax obligations, estimating and financial management — separate from the master's code examination.
How much a plumbing contractor license costs
Fees are the small part; bonding and insurance are the real cost and recur annually. Budget for:
Bond and insurance premiums recur annually and scale with payroll and revenue, so the licence fee is a poor guide to the real cost. Confirm with the board, a surety and an insurance broker.
The plumbing contractor license exam
The technical examination in this licence family belongs to the qualifying master and is written against the adopted plumbing code. What the contractor licence usually adds is a business and law examination: contract formation, licensing regulations, lien and payment law, employment and tax obligations, insurance and bonding, estimating and financial management. It is typically open book against the state's contractor manual and statutes. Several states also review financial statements or apply a minimum net worth test, which functions as a gate even though it is not an examination.
How long it takes to get licensed
The long part is producing a qualifying master — years of apprenticeship, journeyman work and the master exam. Licensing the business then takes months.
Plumbing Contractor license types: the full ladder
It helps to see where the contractor licence sits relative to the personal licences beneath it.
Apprentice and journeyman workforce
The personal licences the crew holds; no combination of them authorises contracting to the public.
Master plumber (qualifying individual)
The personal licence the contractor licence hangs on, taking responsibility for the company's plumbing work.
Plumbing contractor licence
The business licence: authorises offering, bidding, contracting and pulling permits for plumbing work.
Limited or specialty contractor class
Restricted classes issued by many states — residential-only, sewer and drain, or value-capped licences with lighter requirements.
Local contractor registration
City and county registrations required in addition to a state licence in many metropolitan areas.
Bond and insurance filings
A continuing condition of the licence rather than a class: a lapse in either suspends the contractor's authority to work.
Master plumber vs Plumbing contractor: plumbing contractor license
Plumbing Contractor license reciprocity between states
Contractor licences reciprocate poorly. Some states waive the trade examination for a qualifier already licensed elsewhere, but the business and law examination, the bond and the insurance filings are almost always state-specific and must be completed again, and the IPC/UPC split makes trade waivers less common in plumbing than in other trades. Where licensing is municipal, each city is a separate application. Plan for a new licence in each state, keep the qualifier's credentials portable, and confirm with each board which examinations it will waive.
Plumbing Contractorsalary & job outlook
Plumbing contractors are counted among first-line supervisors of construction and extraction workers, with a median of about $79,920 per year ($38.42/hour), though owner earnings depend on the business rather than a wage. Employment in the supervisory category is projected to grow 5.3%, with roughly 74,400 openings a year. See the full plumbing contractor salary guide for pay by state, city and experience level.
Plumbing Contractor license requirements by state
The key questions by state are who issues the licence and what bond, insurance and financial requirements attach to it.
Most states license plumbing contractors at state level; some leave it to cities and counties, which means several local licences rather than one. Bond amounts, insurance minimums and the rules on how many licences a master may qualify are state-set and change. Confirm with the licensing authority and with a surety before budgeting.
Browse all state guides
Plumbing Contractor license FAQs
BLS Occupational Outlook Handbook (Plumbers, Pipefitters and Steamfitters) · U.S. Bureau of Labor Statistics, OEWS May 2025 (47-1011) · IAPMO, Uniform Plumbing Code · U.S. Small Business Administration, business licences and permits. Requirements and fees are set per state and change, confirm with your state board before applying.
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