Best Commercial Insurance Carriers for Plumbers (2026)

Plumbing contractors are among the more straightforward contractor classes to place — most standard market carriers will write them, the GL class codes are well understood, and loss frequency is moderate compared to trades like roofing or demolition. But "easy to place" does not mean every carrier is a good fit. The difference between the right carrier and a mediocre one shows up in premium, coverage breadth, audit handling, and how smoothly you can actually get a quote out the door.

This guide breaks down the carriers that consistently write plumbing accounts well, where each one excels and falls short, and how to match the right carrier to the right plumbing contractor. If you need a broader overview of contractor coverage needs first, start with our contractor insurance guide.

What Plumbing Contractors Need

Before comparing carriers, it helps to ground the conversation in what a typical plumbing account actually requires. Most plumbing contractors need five core lines:

• General liability: The foundation of every plumbing account. Water damage is the primary exposure — a burst pipe in a finished basement, a faulty connection that floods a commercial kitchen. GL class codes for plumbers (NAICS 238220) are well established, and most carriers write them without heavy underwriting scrutiny.
• Workers compensation: Required in nearly every state once the plumber has employees. Plumbing WC rates vary by state but are moderate relative to other construction trades. The class code (5183 for plumbing) reflects the combination of physical labor, tool use, and exposure to confined spaces.
• Commercial auto: Plumbers run vans and trucks loaded with pipe, fittings, and equipment. Most need a commercial auto policy covering multiple vehicles, and many need hired and non-owned auto as well for employees using personal vehicles to reach job sites.
• Inland marine: Tools and equipment travel to every job. A plumber's tools — pipe threaders, camera inspection equipment, hydro-jetting machines — can easily represent $20,000 to $80,000 in value. A contractors equipment floater protects this gear on the road and at job sites where a BPP policy would not respond.
• Business owners policy (BOP): For plumbers who operate out of a shop or office, a BOP bundles general liability with commercial property coverage. This works well for smaller operations, though larger plumbing contractors typically need standalone GL and property policies for better limit flexibility.

Some accounts will also need umbrella or excess liability — particularly plumbers working as subcontractors on commercial projects where the GC requires $2M or $5M in total limits.

Carrier Comparison Table

The table below compares the major carriers writing plumbing contractors in 2026. Premium ranges are approximate and assume a small to mid-size plumbing operation (3-15 employees, $500K-$2M revenue).

Top Carriers in Detail

Hartford

Hartford is the default answer for a reason. Plumbing is a core contractor class in their small commercial book, and their appetite is broad across most states. They write GL, WC, commercial auto, inland marine, and umbrella for plumbing contractors, and their BOP product handles smaller accounts cleanly.

What they write well: Residential and commercial plumbing contractors with 3-25 employees, clean loss history, and revenue under $5M. Hartford's package pricing is competitive when you bundle three or more lines, and their small commercial platform lets you quote and bind most plumbing accounts without underwriter involvement.

What they decline or restrict: New ventures with no prior insurance history can be difficult. Hartford also tightens on plumbers doing fire suppression or sprinkler installation — those subclasses carry higher severity exposure, and underwriters often want to see them separately. Plumbers with more than two water damage claims in three years will face surcharges or non-renewal.

Quoting process: Hartford's agent portal handles most plumbing accounts through their automated workflow. Straightforward risks quote in under 15 minutes. Accounts with losses or unusual operations get kicked to an underwriter, which adds 1-3 business days.

Pros: Competitive package pricing, strong brand recognition with contractor clients, reliable claims handling, broad state availability.

Cons: Not the cheapest on monoline GL, automated underwriting can be rigid on borderline accounts, limited flexibility for accounts that fall outside their standard appetite box.

biBERK

biBERK — Berkshire Hathaway's direct-to-small-business platform — has become a go-to for smaller plumbing operations. Their sweet spot is the solo plumber or 2-3 person shop that needs GL and WC without the complexity of a full commercial package.

What they write well: Plumbing contractors with 1-10 employees and revenue under $1M. biBERK prices aggressively on GL for clean plumbing accounts, and their workers comp rates are competitive in most states. The quoting process is fully digital — you can have a bindable quote in under 10 minutes.

What they decline or restrict: biBERK does not offer standalone inland marine, which limits their usefulness for plumbing accounts with significant equipment exposure. They also restrict plumbers doing gas line work in some states, and their underwriting on new ventures is tighter than their marketing suggests.

Quoting process: Entirely online. Enter the business details, answer the underwriting questions, and receive a bindable quote. No phone calls, no submission forms, no waiting for an underwriter. This speed is the primary selling point.

Pros: Fast digital quoting, competitive GL and WC pricing for small accounts, Berkshire Hathaway financial backing, simple policy administration.

Cons: No inland marine, limited endorsement flexibility, coverage customization is minimal, not ideal for larger accounts needing a full package with specialized endorsements.

NEXT Insurance

NEXT Insurance targets the same small contractor segment as biBERK but offers a slightly broader product set that includes commercial auto alongside GL, WC, and BOP.

What they write well: Plumbing startups and small operations, particularly those with 1-5 employees. NEXT's pricing on GL for new plumbing businesses is often the most competitive in the market. Their commercial auto product, while basic, is a convenient addition for small operations that want to bundle auto with GL digitally.

What they decline or restrict: NEXT caps out around $1M-$2M in revenue for most plumbing classes. They are not a fit for commercial plumbing contractors working on large-scale projects. Their inland marine offering is limited, and umbrella capacity is thin — typically offering $1M or $2M per occurrence options, which can bring the total GL aggregate up to $4M.

Quoting process: Similar to biBERK — fully digital, quote-to-bind in minutes. NEXT's platform is arguably the smoothest of the digital carriers for contractor classes. They also offer an agent portal that is functional, though less established than Hartford's or Travelers'.

Pros: Fastest quoting experience, competitive new venture pricing, commercial auto included, clean digital certificates.

Cons: Limited capacity for larger plumbing accounts, thin umbrella limits, endorsement options are basic, less established claims reputation.

Travelers

Travelers writes plumbing contractors through both their small commercial and middle market platforms. For agents with a Travelers appointment, they are a strong option for mid-size plumbing accounts that need broader coverage than the digital carriers provide.

What they write well: Commercial plumbing contractors with 5-50 employees, revenue from $1M to $10M, and multi-line needs including inland marine and umbrella. Travelers' contractors inland marine product is among the best in the market, with equipment schedules that accommodate the specialized tools plumbers carry.

What they decline or restrict: Travelers is more selective than Hartford on residential plumbers with high water damage frequency. They also pull loss runs carefully and will decline accounts with adverse development on prior GL claims. Pricing is not aggressive on monoline GL — Travelers wants the package.

Quoting process: Small commercial accounts can go through their automated platform. Larger plumbing accounts require a formal submission to an underwriter, which typically takes 3-5 business days for a firm indication. Travelers underwriters are generally responsive on contractor classes.

Pros: Excellent inland marine product, strong umbrella capacity, broad geographic reach, competitive package pricing on multi-line accounts.

Cons: Slower quoting on larger accounts, less competitive on monoline, selective on loss history, requires established agency relationship.

Acuity

Acuity is a regional mutual carrier based in Wisconsin that writes aggressively in the Upper Midwest and has expanded to 32 states. For plumbing accounts in their footprint, Acuity frequently beats national carriers on both price and coverage breadth.

What they write well: Residential and commercial plumbers in their core states (Wisconsin, Minnesota, Iowa, Illinois, Indiana, Ohio, and surrounding states). Acuity's underwriters have genuine authority to customize coverage — they will add endorsements, adjust deductibles, and work with agents on accounts that do not fit neatly into an automated box. Their contractors package includes GL, WC, auto, inland marine, and umbrella.

What they decline or restrict: Acuity is limited by geography. If the plumbing contractor operates outside their footprint states, they are not an option. They are also more conservative on very new plumbing ventures — they prefer at least one year of operating history.

Pros: Competitive pricing, flexible underwriting, full package capability, strong agent relationships, dividend-paying mutual.

Cons: Limited geographic footprint, slower digital quoting compared to national carriers, not a fit for accounts outside their core states.

Progressive Commercial

Progressive is primarily a commercial auto carrier for plumbing accounts. Their core product is commercial vehicle coverage, and they write plumbing fleets well — particularly operations with 3-15 vehicles.

What they write well: Commercial auto for plumbing contractors of all sizes. Progressive's pricing is competitive, their quoting is fast, and they handle fleet changes (adding or removing vehicles) efficiently. For agents placing a plumber's auto separately from the rest of the package, Progressive is a consistent option.

What they decline or restrict: Progressive does not write standalone GL for plumbing contractors directly — their GL products come through partnerships and are not as competitive as dedicated GL carriers. They are a monoline auto solution, not a package carrier for plumbing accounts.

Pros: Strong commercial auto pricing, fast quoting, good fleet management tools, broad state availability.

Cons: Not a full package carrier, GL offering is secondary, does not replace the need for a primary GL/WC carrier.

How to Get the Best Quote for a Plumbing Contractor

Placing plumbing accounts well is less about finding a secret carrier and more about presenting the risk correctly and knowing which carrier fits which account profile. Here are the practical steps that make a difference.

Classify the work accurately. Plumbing covers a wide range — residential service and repair, new construction rough-in, commercial TI work, fire suppression, gas line installation. Each subclass carries different rates and different underwriting scrutiny. Make sure the application reflects the actual work mix. If a plumber does 80% residential service and 20% new construction, say so. Carriers price blended operations differently than pure-play accounts.

Get loss runs early. Every carrier writing plumbing contractors cares about water damage claims history. Pull five-year loss runs before you start quoting. If the account has losses, prepare a narrative explaining what happened and what the contractor changed to prevent recurrence. A two-paragraph loss explanation submitted proactively saves days of back-and-forth with underwriters.

Bundle where possible. Hartford, Travelers, Acuity, and Erie all price more competitively when you package GL, WC, auto, and inland marine together. A plumbing contractor who splits their coverage across four carriers is almost certainly paying more in total premium than one who packages with a single carrier. The exception is commercial auto — sometimes Progressive on auto plus Hartford on everything else produces the best total cost.

Match the carrier to the account size. Do not place a $300K-revenue solo plumber with Travelers, and do not place a $5M commercial plumbing outfit with NEXT Insurance. The digital carriers (biBERK, NEXT, Thimble) are built for small accounts. The traditional carriers (Hartford, Travelers, CNA) serve the mid-market better. Regional carriers (Acuity, Erie) often hit the sweet spot for accounts in between.

Quote at least three carriers. Plumbing is a competitive class. Carriers know other markets want the account, and pricing varies meaningfully. A 15-minute investment in running a third quote can save your client hundreds or thousands of dollars in annual premium — and gives you a credible story at renewal when a competitor tries to move the account.

Document inland marine values. Many plumbing contractors underestimate the value of their tools and equipment. A camera inspection system alone can cost $15,000-$30,000. Walk through the equipment list with the client and make sure the inland marine schedule reflects actual replacement cost. Underinsured equipment is a common E&O exposure on contractor accounts.

Frequently Asked Questions

Which carrier is cheapest for plumber general liability?

There is no single cheapest carrier — it depends on the account profile. For solo plumbers and very small shops, biBERK and NEXT typically offer the lowest GL premiums. For established plumbing contractors with 5+ employees and clean loss history, Hartford and Acuity (in their footprint states) tend to be most competitive. Always quote at least three markets to find the best rate for the specific account.

Can I write plumbing contractors through Thimble?

Thimble writes GL and BOP for plumbing contractors, and their short-term and flexible policy options work for part-time or seasonal plumbers. However, Thimble does not offer workers compensation, commercial auto, or inland marine. For a full-time plumbing operation with employees and a fleet, Thimble covers only a fraction of what the account needs. It works as a supplemental market, not a primary carrier for most plumbing accounts.

Do plumbers need inland marine coverage?

Almost always, yes. Plumbers carry specialized tools and equipment to job sites daily — pipe threaders, inspection cameras, hydro-jetting equipment, soldering and welding tools. A standard BOP or commercial property policy covers equipment at the listed premises but typically excludes or severely limits coverage for property in transit or at job sites. An inland marine contractors equipment floater fills that gap. For any plumber with more than basic hand tools, inland marine should be part of the conversation.

What class codes do carriers use for plumbing contractors?

The standard ISO GL class codes for plumbing contractors are 98482 (Plumbing — Commercial and Industrial) and 98483 (Plumbing — Residential or Domestic). SIC 1711 is also used as a general industry code. For workers compensation, the governing class code is NCCI 5183 (Plumbing NOC) in most states, though some states have their own bureau codes. The classification assumes standard plumbing work — if the contractor does fire suppression, HVAC, or gas line installation as a significant portion of revenue, additional or different class codes may apply. Always confirm the actual work description matches the class code on the application.