Plumbing contractor insurance in Minnesota

Minnesota plumbing licenses and the contractor rules

In Minnesota, a plumbing contractor license and a license to do plumbing are two different things. The Department of Labor and Industry (Minnesota DLI plumbing licensing) issues both, and the contractor license alone doesn't let you do plumbing work. The business must employ a licensed master plumber as its responsible individual.

DLI's personal license types include:

• Master plumber, valid statewide
• Journeyworker plumber, working under a master's direction
• Restricted master and restricted journeyworker, limited to towns under 5,000 people
• Registered unlicensed individual or apprentice, under direct supervision of a licensed plumber
• Certified pipelayer, for exterior water and sewer pipe only

A restricted license works only in smaller towns. If your shop starts taking calls in Rochester, Duluth or the Twin Cities, the people doing that work need full licenses.

The Minnesota Plumbing Board adopts the plumbing code.

Licensing is state-level. The plumbing statute has no provision for separate city plumbing licenses, though DLI notes local governments can add their own permit and inspection requirements. Check with the building office in Minneapolis, St. Paul or wherever you pull permits.

Septic work needs its own license. To design, install, maintain, pump or inspect a septic (SSTS) system, you need a Minnesota Pollution Control Agency license, which requires general liability insurance and a surety bond of at least $25,000.

Minnesota workers' comp and the owner exclusions

Minnesota requires every employer with employees to carry workers' comp. Plumbing shops get no minimum headcount, so the first employee triggers coverage.

Many owners are left out unless they ask in. The law excludes sole proprietors and their spouse, parents and children, business partners and their families, and certain owners of small LLCs and closely held corporations who hold 25% or more. Excluded owners and officers can choose coverage by giving written notice to the insurer. DLI's site (Minnesota Department of Labor and Industry) also oversees workers' comp compliance. If you work in the field yourself, decide on purpose whether to include yourself.

Going uninsured is costly. The commissioner can order compliance and impose a penalty of up to $1,000 per employee for each week without coverage. The state can also bar you from employing anyone until you're insured. Willful failure to insure is a gross misdemeanor, and penalties become a lien. Set up workers' comp for plumbers before the first hire. Get a quote for your plumbing business →

Comp is priced per $100 of payroll by job class, then adjusted by your experience mod. In NCCI states, plumbing usually falls under 5183 while sewer construction has its own class, 6306. A crew that does deep service trenching should make sure its carrier has the payroll in the right class before audit.

Frost, lead and old houses: Minnesota plumbing risks

Deep frost

The State Building Code splits Minnesota into two frost zones. Zone I, with 34 northern counties including St. Louis County, needs footings at 5 feet. Zone II, which includes Hennepin, Ramsey and Olmsted counties, needs 3.5 feet. Deep frost means deep trenches for water and sewer services and frozen lines every winter.

Shops that excavate laterals and services carry more than a service plumber's risk: buried utilities, collapsing trench walls and sewage on site. Our page on drain and sewer contractor insurance covers the coverage questions that come with digging.

Trench work near buried utilities is where policy wording matters. If your general liability carries an XCU exclusion added by endorsement, damage to buried pipes and lines from your digging equipment may be excluded. Ask whether your policy has one, and have it removed or carved back for the work you do.

Lead service lines

Saint Paul Regional Water Services counts about 17,000 lead service lines among roughly 96,000 properties, or 18%, and plans to replace all of them, public and private sides, between 2023 and 2032. In Minneapolis, service lines installed before 1930 usually used lead. Replacement programs bring steady work, and lead is the kind of contaminant where the pollution exclusions on a GL policy may come into play. Ask whether your coverage reaches it, and whether contractor pollution liability makes sense for the work.

Old core-city housing

In Minneapolis and Duluth, 42.8% of housing units predate 1940, and St. Paul is close behind at 41.6%. Nationally the figure is 11.7%. Old drains and supply lines make every repair a chance for water damage.

Example scenario: A tech thawing a frozen supply line in a 1910 duplex opens up the ceiling to reach it. The pipe has already split above the kitchen, and when the ice lets go, water runs through two floors. Damage to the finished rooms below is a typical liability question. Damage the original freeze caused before you arrived is not your claim.

Minnesota markets we insure

What drives plumber insurance costs in Minnesota

Minnesota's statutory liability minimums of $50,000 per person, $100,000 per occurrence and $10,000 of property damage are a floor, not a working limit. Many plumbers carry far more. A common small-contractor policy is $1 million per occurrence and $2 million aggregate, and commercial contracts often ask for more on top.

The bond adds its own small cost. Surety premiums run as a percentage of the bond amount, and published industry data shows a general range of 1% to 15%, with 1% to 3.5% for strong credit. You repay the surety for any claim it pays.

Owner choices show up in comp too. Premium is figured on payroll, so an owner who elects coverage usually adds payroll to the policy, under rules your carrier applies. That's a fair trade for an owner who works in the field, and worth weighing for one who mostly runs the office.

Winter driving, deep trench work and how many owners you include on comp all move the number. Your price depends on payroll, revenue, claims history, the work you do and the limits you choose. Read our plumber insurance pricing guide for national medians. Get a quote for your plumbing business →

Our Minnesota agency license

Plumbing Insurance Group is a brand of The Allen Thomas Group, licensed in Minnesota (License #40821720, NPN 7642818). We quote plumbing contractors anywhere in Minnesota, from Moorhead to the Arrowhead.