Site prep, excavation and underground utility contractors start most projects, and they work where a single bucket of dirt can hit a gas main, a fiber line or a water main. The equipment is expensive, the crews work around trenches and heavy machines, and contracts with developers, GCs and local governments ask for high limits and bonds.

This page explains, in plain terms, the insurance and risk issues that owners of site work and underground utility businesses in North Central and Northeast Florida deal with.

What site and utility owners deal with day to day

  • Utility strikes. Hitting a buried gas, power, water, sewer or communications line can cause property damage, outages for neighbors, injuries and repair bills from the utility owner.
  • Trench collapses. Cave-ins are one of the most serious hazards in construction.
  • Heavy equipment. Excavators, loaders, dozers and trenchers are high-value, and they get damaged, stolen or rolled over.
  • Damage to neighboring property. Vibration, settling, runoff and mud onto roads or nearby lots.
  • Fuel and pollution. Fuel spills from equipment and disturbing contaminated soil.
  • Moving equipment on public roads. Hauling your own machines between jobs on trailers.

Typical claims in site and utility work

Utility damage is the claim site work contractors hear about most. Equipment losses from theft, fire, rollover or water are also common. Auto claims involve dump trucks and equipment trailers. On the workers’ comp side, struck-by and caught-in incidents, trench hazards and strains are the usual patterns. Some general liability policies limit or exclude explosion, collapse and underground damage, known as XCU, which is why it’s worth reading your policy before you need it.

Coverage at a glance

Coverage Why it matters here Learn more
General liability, including completed operations Damage to underground lines, neighboring property and third parties. Check for any XCU (explosion, collapse, underground) exclusion General liability
Workers’ compensation Required in construction with one employee Workers’ comp
Contractor’s equipment (inland marine) Owned, leased and rented equipment against theft, fire, rollover and collision Ask us about equipment coverage
Commercial auto Dump trucks, pickups and trailers used to move your own equipment Commercial auto
Contractor’s pollution liability Fuel spills, contaminated soil and runoff that a general liability pollution exclusion can leave out Pollution coverage explained
Commercial umbrella Extra limits developers and public owners often require Umbrella
Bonds Bid, performance and payment bonds for private and public work Bonds

What your contracts ask for, in plain words

Most of the insurance questions site and utility contractors face start in a contract, not a policy. Before you sign, read the insurance section and the indemnity section together, because one tells you what you promised to pay for and the other tells you what insurance has to back it up. These are the terms you’ll see most:

  • Minimum limits. The contract lists dollar amounts for general liability, auto, workers’ comp employer’s liability and often an umbrella. Your limits have to meet or beat those numbers on the day you start work.
  • Additional insured. The general contractor or owner wants to be covered under your policy for claims that come out of your work. Many contracts ask for this both while you’re working (ongoing operations) and after the job is done (completed operations), and the endorsement on your policy has to match what the contract says.
  • Waiver of subrogation. After your insurance company pays a claim, it normally has the right to go after whoever caused the loss. A waiver gives up that right against the party named in the contract. It usually takes an endorsement, sometimes on several policies including workers’ comp.
  • Primary and noncontributory. If the contract asks for it and your policy has an endorsement that provides it, your policy pays first for the other party’s covered claim and doesn’t ask their own insurance to share the loss. It isn’t automatic; it takes endorsement wording.
  • Per project aggregate. Some contracts want your general liability aggregate limit to apply separately to each job, so a large claim on one project doesn’t use up the limit for the others.
  • Utility damage and indemnity. Developer contracts sometimes make you responsible for all damage to existing utilities, marked or not. Know what your contract says and what your policy covers before you dig.

If a contract asks for something your policy can’t do, the time to find out is before you sign. Send us the insurance pages of the contract and we’ll tell you how they line up with your policy and what may need an endorsement. For indemnity and other legal terms, talk with your attorney.

Certificates of insurance: what you’ll be asked for

A certificate of insurance is the one-page summary a GC, owner or property manager asks to see before your crew and equipment can start. A certificate is for information only. It doesn’t change or add coverage, which is why careful GCs also ask for copies of the endorsements behind it. Expect requests to show:

  • Policy numbers, dates and limits for general liability, auto, workers’ comp and umbrella
  • The certificate holder’s exact legal name and address
  • Additional insured, waiver of subrogation and primary and noncontributory wording, with the endorsement forms attached when the contract calls for them
  • Workers’ comp coverage, or a copy of the exemption certificate for a qualifying corporate officer or LLC member

Keep one person in your office in charge of certificates, and keep a list of which jobs need updated ones at renewal. You can send requests through our certificate request form.

Workers’ comp for your crew and your subs

Florida treats site work and underground utility work as construction for workers’ comp. That changes the rules in three ways owners feel directly.

  • One employee is enough. In construction, a business with even one employee has to carry workers’ comp, and an owner who is a corporate officer or LLC member counts unless they’ve filed an exemption. Most non-construction businesses don’t have to until they have four or more employees, full- or part-time.
  • Officer exemptions are narrower. Up to three corporate officers or LLC members who each own at least 10% of the business (three total across affiliated companies) can apply for an exemption through the Division of Workers’ Compensation. It costs $50, lasts two years and is renewed online. An exempt officer or member isn’t covered for their own injuries, so think about health and disability coverage too.
  • You’re responsible for uninsured subs. Under Florida law, if a sub doesn’t have coverage, the contractor above them is treated as the employer of that sub’s workers for comp purposes. That’s why you have to collect each sub’s certificate or exemption before they start, and why it has to stay current for the whole job.

Why audits bring surprise charges

Comp premium starts as an estimate based on the payroll you expect. After the policy ends, the insurance company audits the real numbers. Florida’s audit rules tell auditors to review every source of payment to employees, subcontractors and independent contractors, and to look at the certificates your subs gave you. If a sub can’t show workers’ comp coverage or a valid exemption, Florida law counts the people you paid through that sub as your employees for comp purposes, so the auditor can add those payments to your payroll and charge premium on them. Construction employers large enough to have an experience mod must be audited at least once a year.

Being uninsured is expensive too. The state can issue a stop-work order, and the penalty is two times what the employer would have paid in premium over the prior 12 months, or $1,000, whichever is more.

Report every injury to us or your insurance company right away. Florida requires the employer to report an injury to its carrier within 7 days after learning of it. Read more on our workers’ compensation page.

Your experience mod (EMR): what it is and why GCs ask

If your workers’ comp premium is large enough, your business gets an experience modification factor, often called the mod or EMR. It compares your company’s actual workers’ comp losses with what’s expected for a business of your size doing the same type of work. A mod of 1.00 is average. Below 1.00 is a credit, and above 1.00 is a debit that raises your premium. Small or new businesses that don’t meet the size threshold don’t have one.

Who calculates it in Florida

Florida uses the experience rating plan run by NCCI, the National Council on Compensation Insurance. NCCI calculates the mod, not your agent and not your insurance company. It normally uses three years of payroll and claims, and it leaves out the most recent year before the mod takes effect, because those claims are still too new to judge.

Why it matters when you bid

General contractors, owners and bid packages often ask for your mod, and some use it to prequalify site work subs before you’re allowed to bid. A mod above 1.00 can keep you off a bid list even when your price is right, because the GC reads it as a sign of how safely you work.

Why frequency usually moves it more than one big claim

The formula weighs the first part of every claim heavily and only part of the cost above that. So a string of small injuries usually raises a mod more than one large one. Under NCCI’s experience rating plan, a medical-only claim (one with no lost-time benefits) generally counts at only 30% of its cost in your mod where NCCI’s Experience Rating Adjustment applies. Report every injury, even small ones. Florida requires employers to report an injury to their insurance company within 7 days of learning of it, and paying a claim yourself instead of reporting it can put you out of compliance and leave the worker without benefits the law gives them. Where the ERA applies, medical-only claims already count at a reduced value in the mod, so there’s little reason to pay them yourself.

What you can do about your mod

  • Run a written safety program that fits your actual work, and hold short, regular crew talks, for example on trench protection, equipment spotting and struck-by hazards
  • Report every injury the same day, so the claim is handled before costs grow
  • Offer light or modified duty so injured workers can come back sooner, since lost-time claims usually cost more than medical-only ones
  • Ask us for your mod worksheet each year and check it: wrong payroll, a claim that isn’t yours or a closed claim still showing reserves can all push the number up
  • Make sure each employee is in the right class code and your payroll is reported correctly, because the mod is built on those numbers

Want to go deeper? Our experience mod guide explains which years count, why small claims add up and how to read your mod worksheet.

Equipment and vehicles

Contractor’s equipment coverage, a type of inland marine, covers machines you own, lease or rent. Keep a schedule with serial numbers and current values, and know which pieces are on which job. Rental agreements often make you responsible for damage to rented machines, so ask us whether your policy extends to them and at what limit.

Dump trucks and trailers need commercial auto coverage. This page is about hauling your own equipment and materials, not for-hire hauling for others, which is a different kind of insurance. If employees drive their own vehicles for work, see our post on employees driving personal vehicles.

Florida licensing, 811 and bonds

Florida licenses underground utility and excavation contractors through the Construction Industry Licensing Board. The license covers main sewer, water and storm systems and the lines from the main up to the meter or property line, whether the work is done by open trench or by directional drilling, boring and other trenchless methods. Florida has no state license category for clearing and grading on its own. Since 2021, state law generally bars cities and counties from requiring a license for job scopes that don’t match a state category, so a local license usually can’t be required either. Permits may still apply, so check with the city or county.

Florida’s underground facility damage prevention law requires you to notify Sunshine 811 at least two full business days before you dig, and at least ten full business days for work beneath state waters. A ticket is good for 30 calendar days. The law’s definition of excavation includes directional drilling and boring.

Federal OSHA rules require a protective system, such as sloping, shoring or a trench box, for excavations 5 feet or deeper unless the cut is entirely in stable rock, and a competent person has to inspect excavations daily, before work starts, as needed during the shift, and after rainstorms or other events that make conditions more hazardous.

Public projects over set amounts require payment and performance bonds under Florida law, and FDOT prequalification is required to bid on any construction contract FDOT lets that’s over $250,000.

See Florida contractor license insurance and bond rules for the minimum amounts, audits and bond rules.

Practical risk management steps

  • Call 811 for every dig, wait for marks, and keep the ticket and photos of the marks with the job file
  • Hand dig or use vacuum excavation near marked lines, and stop and call if you find something unmarked
  • Have a competent person check trenches daily and after rain
  • Use spotters and backup alarms around equipment
  • Park and lock equipment at night, remove keys, and consider GPS tracking
  • Keep spill kits on fuel trucks and train crews to use them
  • Document neighboring property conditions before you start

Questions to ask before you renew

  • Does my general liability exclude explosion, collapse or underground damage?
  • Is all my owned, leased and rented equipment on the schedule at current values?
  • Do I have pollution coverage for fuel and soil?
  • Are my trucks and trailers rated for the way we actually use them?
  • What will my experience mod be, and is the worksheet correct?
  • Do my bonding capacity and umbrella limits fit the jobs I want to bid next year?

Frequently asked questions

Am I covered if we hit an unmarked utility line?

It depends on your general liability policy and whether it has an explosion, collapse and underground (XCU) exclusion. Keeping your 811 ticket and photos of marks helps show you followed the law.

How far ahead do I have to call 811?

At least two full business days before you dig, and at least ten full business days for work beneath state waters.

What is XCU?

It stands for explosion, collapse and underground. Some general liability policies exclude or limit these, which matters for excavation and utility work.

Is my rented excavator covered?

Not automatically. Ask us whether your equipment policy covers rented machines and at what limit, and read the rental agreement.

When is a trench box required?

OSHA generally requires a protective system for excavations 5 feet or deeper unless the cut is entirely in stable rock.

Why does a developer want my experience mod?

It shows how your workers’ comp claims compare with similar businesses. 1.00 is average, and many developers and GCs use it to prequalify subs.

Do I need bonds for public work?

Usually. Florida law requires payment and performance bonds on many public construction projects.

Sources

General information, not legal or coverage advice. Coverage depends on the policy issued, its terms and underwriting, and contract requirements depend on the contract you sign. Check licensing and safety rules with the agency that enforces them.

McGriff-Williams Insurance is an independent insurance agency in Gainesville, in business since 1983 and licensed in Florida. We’re at 3501 W University Ave, Gainesville, FL 32607. Questions: (352) 371-7977, Monday to Friday, 9 a.m. to 5 p.m.

Last updated October 31, 2026