Texas Plumbing Contractor General Liability Insurance Cost & Coverage

Water damage is the defining loss for a Texas plumbing contractor. A single failed joint behind a wall can cause more property damage than the entire job was worth. Plumbing general liability is structured around that reality — water-damage class codes, mold sublimits, and completed-operations tails determine whether a leak claim pays or denies. A correctly structured plumbing GL protects both the contractor and the property owner.

Plumbing Class Codes Carriers Use

Carriers separate plumbing into residential service/repair, residential new construction, and commercial plumbing. Residential service carries the lowest base rate; commercial plumbing and new-construction rough-in carry higher rates because of project value and exposure duration. Break payroll out by operation so each is rated at its own lower class code instead of a blended high rate.

Water Damage and Mold Sublimits

Most plumbing GL policies cap or exclude mold remediation. A slow leak that produces mold can multiply the claim cost several times over. Verify whether your policy carries a mold sublimit (often $25K–$100K) or a full exclusion, and buy back mold coverage if your work involves any moisture intrusion. Backflow testing and installation should also be confirmed covered — contamination claims from failed backflow preventers are expensive.

Completed Operations for Plumbing

A leak discovered weeks after a rough-in is a completed-operations claim. Plumbing GL must include products and completed operations coverage, and the policy should not exclude resulting water damage from your work. Some policies attempt to exclude faulty workmanship entirely — avoid those, because the resulting damage is exactly what GL should cover even when the work itself is not redone.

What Drives Plumbing GL Cost in Texas

Base rate per $1,000 of payroll and subcontractor cost, modified by service-vs-new-construction mix, residential-vs-commercial mix, and mold coverage limits. A residential service plumber with $200K payroll often pays $1,000–$2,200 for $1M/$2M. A commercial plumbing contractor running $1M payroll can pay $4,000–$9,000 plus an umbrella. Subcontractor cost without sub COIs is charged at the highest plumbing rate.

How to Lower Plumbing GL Premium

• Separate service payroll from new-construction payroll for proper class-coding
• Collect COIs from 1099 rough-in crews and name yourself additional insured
• Buy back mold coverage rather than accept a full exclusion
• Document backflow-tester certification — carriers discount verified credentials