Plumbing contractor insurance, for the loss that arrives after the truck leaves
A plumbing contractor's exposure is water, and the timing is what makes it hard: the fitting that lets go a week after the crew has left is a completed operations claim, with its own limit on the general liability form. Texas licenses plumbing in tiers and requires a company that offers plumbing to retain a responsible master plumber, who files a certificate of general liability insurance with the state board, at not less than $300,000 for all claims in a one-year period, before working as one. The van stock and the drain machines are property that travels, the van is commercial auto, and the first apprentice brings workers compensation.
Plumbing liability insurance: general liability and the water
A commercial general liability policy responds to four categories of events a business can be held responsible for, in the NAIC's list: bodily injury, damage to others' property, personal injury such as slander and libel, and false or misleading advertising (NAIC, Insure U: Small Business Insurance). The first two are a plumbing job. Bodily injury is the homeowner scalded at a tap after a water heater was set wrong, or the tenant who falls on the wet hallway. Property damage to others is the ceiling below a supply line, the hardwood under a dishwasher connection, the neighbor's unit in a condominium stack. Those are the claims the form was written for, and they are the ones that make this trade's liability premium what it is.
When the water shows up is the hard case. A line that fails while your crew is in the building is an operations claim. A line that fails after the job is invoiced and the truck is gone is something else. IRMI describes products-completed operations as "one of the hazards ordinarily insured by a general liability policy," covering liability arising out of the insured's operations away from its premises once those operations are completed, and defines completed operations as work "completed as called for in a contract" or "put to its intended use" (IRMI, products-completed operations; IRMI, completed operations). That hazard carries its own aggregate on the form, and Texas shows how seriously a regulator can take it: the state's air conditioning contractor rule sets a separate products and completed operations aggregate alongside the per occurrence and general aggregate figures, which the HVAC contractor insurance page prints. The plumbing statute does not split the figure that way, so the completed operations limit on a plumber's policy is the agent's question, not the board's, and it is the first one to ask.
The fixture in your hands is the other hard case. Liability forms commonly carry a care, custody, or control exclusion, which IRMI describes as eliminating coverage for damage to property in the insured's care, custody, or control, and which courts have read to mean either physical possession or a legal duty to look after the property (IRMI, care, custody, or control). The cast iron stack that cracks when you cut into it, the tile you broke getting to the valve, the fixture chipped on the way in: whether each was in your care is a form-and-facts question that IRMI records courts splitting on. Ask, in those words, how the form treats property you are working on. What the form leaves out is on the NAIC's list too: professional errors and omissions, which here is the allegation that you sized the line wrong rather than that you installed it wrong.
Plumbing contractor insurance requirements: the Texas board's certificate
Texas licenses trades rather than general contractors, and plumbing is one of the licensed trades, run by the Texas State Board of Plumbing Examiners rather than by TDLR (TDLR, licensed programs; the structure is on the Texas contractor insurance hub). The Occupations Code defines the tiers. A "master plumber" is a licensed person "skilled in the design, planning, and superintending of plumbing" with at least four years as a journeyman; a "journeyman plumber" "has completed at least 8,000 hours working under the supervision of a responsible master plumber" and "installs, changes, repairs, services, or renovates plumbing"; a "tradesman plumber-limited license holder" "constructs and installs plumbing for one-family or two-family dwellings"; and a "plumber's apprentice" is a person who "as the person's principal occupation, learns about and assists in the installation of plumbing" (Tex. Occ. Code 1301.002). The tier that matters for insurance is the "responsible master plumber," a master plumber who "allows the person's master plumber license to be used by one plumbing company" and "assumes responsibility for plumbing work performed under the person's license." The license required section is built around that person: a person other than a responsible master plumber may not engage in plumbing unless licensed or registered and supervised as the chapter requires, and a person or entity that advertises or offers plumbing must retain a responsible master plumber (Tex. Occ. Code 1301.351).
The certificate, in the statute's words. "Before a master plumber works as a responsible master plumber, the master plumber must provide the board with a certificate of insurance that meets the requirements of Section 1301.552" (Tex. Occ. Code 1301.3576). That section, written to the cities that issue plumbing permits, requires them to verify through the board that the plumber has filed the certificate, and says what the certificate must be: written "by an insurer authorized to engage in the business of insurance in this state or an eligible surplus lines insurer," providing "commercial general liability insurance for the responsible master plumber for a claim for property damage or bodily injury, regardless of whether the claim arises from negligence or on a contract," with "coverage of not less than $300,000 for all claims arising in a one-year period" (Tex. Occ. Code 1301.552). The board's own page puts the same requirement in its list of what general supervision means: "maintaining at least $300,000 of general commercial liability insurance; obtaining all necessary permits and requesting all inspections as required by applicable plumbing or building codes; ensuring that all individuals performing plumbing work hold a current license or registration; ensuring that a licensee is present and providing direct supervision at all job sites where one or more registrants are engaged in plumbing; and ensuring that all service vehicles display the company name and RMP's license number" (TSBPE, Responsible Master Plumber). Three things to read out of that. The requirement attaches to the master who lends the company his license, not to the company and not to the journeyman. The figure is written as all claims in a one-year period, which is an aggregate shape, and we print it in those words rather than restating it per occurrence. And it is a floor: a general contractor's certificate request, and a commercial property manager's, will usually ask for more, alongside the "bonded and insured" line our bonded and insured guide explains. The same pattern, a state license with a liability floor attached, runs through the electrician insurance page, where Texas puts the floor in a TDLR rule instead of the statute, and the pest control insurance page, where it sits on the business license by Department of Agriculture rule.
Plumbing equipment insurance: the van stock and the machines
Business property coverage can extend to equipment and supplies whether owned or leased (NAIC), and a plumbing contractor's property is in the van. Drain machines, jetters, press tools and jaws, inspection cameras and locators, threading equipment, and a stocked shelf of fittings and valves ride to every job and sit in a parked van overnight, and a stolen camera is a five-figure property claim before the van itself is counted. Agents write this line as an equipment floater rather than as property at a fixed location; ask how stock and tools stolen from the van are treated, and whether the shop's fixed equipment and the van's are on the same schedule.
Commercial auto for the van
A business that owns or leases vehicles needs commercial auto; personal policies may exclude business-related liability, and commercial forms can reach rented and non-owned vehicles, including employees' own vehicles driven on company business (NAIC). The service van is the trade's premises on wheels, and Texas requires it to carry the company name and the responsible master plumber's license number, so it is a vehicle any underwriter can identify as commercial. It belongs on a commercial auto schedule with its use described; the tools and stock inside it belong on the property schedule above. The apprentice who drives his own truck to a job is driving for you; hired and non-owned auto liability is the line that answers for that vehicle.
Workers compensation for a plumbing crew
Nearly all states require an employer to carry workers compensation, in the NAIC's words (NAIC). Premium starts with payroll sorted into classifications, a rate per $100 of payroll for each class, and an experience modifier for the employer's own loss history; that is the Texas Department of Insurance's description of its system (TDI, workers compensation rate guide). Plumbing has a class of its own in New York, where the rating board's phraseology for code 5183 is "Plumbing – NOC – All Operations to Completion & Drivers," applied to "employers engaged in general plumbing operations which include the installation, fitting, repair and maintenance of various kinds of piping systems in buildings for water, gas and drainage" (NYCIRB, Class 5183). That is New York's code; other states' bureaus make their own call, and we print no rate.
The apprentice is an employee by definition. The Texas tiers are built on supervised hours, so the person learning the trade in your van is working under your direction by statute as well as by fact; for the IRS an employee "works at the control and direction of another," and the right to control counts whether or not it is exercised (IRS Publication 4902). The questions behind the class are trenches, scalds, sewer gas, and the weight of a cast iron tub on a stairway. Texas lets a private employer decline coverage, and the Department of Insurance says workers compensation "is not required in most cases" (TDI, employer resources); the filing a non-subscriber makes and the defenses it gives up are on the Texas hub.
Plumbing contractor insurance cost: what moves the premium
What an underwriter actually weighs. The kind of work leads. Service and repair, remodel, and new construction each read differently, and a contractor rough-in on a tract of houses reads differently from a water heater swap. Whether you pipe gas, and whether you hold the medical gas or fire sprinkler endorsements, since each is a different failure. Whether you trench, how deep, and whether you do sewer replacement, because excavation is its own class of loss. Revenue, because the liability premium is often rated on it, and payroll, because the workers compensation premium is built on it. The vans on the schedule and the stock in them. The completed operations limit you carry, and whether the general contractor's certificate request drives it. Loss history, which reaches the workers compensation premium through the experience modifier and the liability premium through the file. Your state, and whether workers compensation is elective there. The word "plumbing" on an application buys you the class's worst slab leak. Your work mix, your endorsements, and a clean completed-operations record buy you something narrower. The handyman insurance page is the contrast worth reading: the trade that does small plumbing without the license, and the line where that stops.
Your state's rules
A licensed trade in four tiers, a certificate the responsible master plumber files with the board, and an elective workers compensation system with real trade-offs. The Texas hub carries the state's structure; plumbing pages for other states follow as their rules are read.
Or start at the overview for how the whole contractor set fits together.