The short answer
The short version
- General liability for an HVAC or plumbing shop typically runs $800–$3,000 a year; water damage is the claim that follows the trade.
- Your state license bond is a fixed line — California, Arizona, Nevada, Florida and Texas all tie licensing to proof of coverage.
- Property managers and builders ask for $1M/$2M plus additional insured before a technician is on site.
Typical 2026 premium ranges
Ranges KTL sees for small mechanical and plumbing contractors. Trade mix (service only versus installation and gas work), payroll and claims history drive the real number.
| Coverage | Solo technician | Crew of 5–20 |
|---|---|---|
| General liability ($1M/$2M) | $800–$2,500 | $2,500–$9,000 |
| Workers' compensation | Owner may be exempt; priced on payroll | Usually the largest line |
| Commercial auto (per van) | $1,500–$3,500 | $1,500–$3,500 |
| State license bond | $100–$600 a year for the required bond amount | $100–$600 a year for the required bond amount |
| Tools & equipment | $400–$1,500 | $1,500–$6,000 |
| Umbrella ($1M) | $500–$1,200 | $1,200–$3,000 |
What moves the price
Gas line work, sewer and drain replacement, excavation, refrigerant handling and water-heater installation all carry more exposure than service calls, and carriers price them separately. Water damage is the loss that follows the trade — a failed supply line or an unattended valve can produce a five-figure claim in a finished space. Prior water claims, after-hours call volume and how you split technician payroll against office payroll all shift the premium.
Licensing and contract requirements
State boards tie the license to insurance: California contractors file proof of workers' comp or a signed exemption with the CSLB, and Arizona, Nevada, Florida and Texas have their own filing rules. On the job side, property managers and builders typically require $1M/$2M general liability, auto liability, additional insured endorsement, waiver of subrogation and sometimes a $5M umbrella for larger or public projects. Send us the licensing rule or contract section and we will build the program to match it.
How to lower HVAC and plumbing insurance cost
Classify service technicians separately from installation crews, document leak-check, permit and pressure-test procedures, keep refrigerant certification records current, and bundle property and liability into a business owner policy where you qualify. Then shop the market — KTL quotes 20+ A-rated carriers, and mechanical trades are one of the categories where pricing varies most between them.
Frequently asked questions
Do HVAC contractors need general liability?
Commercial and property manager clients effectively require it, and licensing in several states is tied to proof of workers' comp or an exemption. A single refrigerant or combustion incident in a tenant space makes the coverage worth having on its own.
How much does plumbing insurance cost?
A solo plumber generally sees $800–$2,500 a year for general liability plus the cost of vans and comp. Installation-heavy work — sewer replacement, gas lines, excavation — prices higher than service and repair.
Do I need a bond to be licensed?
In most of the states KTL writes, yes — California contractors carry a $25,000 bond, and Arizona, Nevada, Florida and Texas each have their own required amounts. The annual premium is small, but the license will not issue without it.
Does general liability cover water damage from a plumbing call?
It covers water damage caused by a covered occurrence, but exclusions apply to gradual seepage, faulty workmanship and sometimes to the cost of repairing your own work. Read the wording — this is the line that decides whether a callbacks becomes a claim.