Starting a low voltage business, part 6: insurance, bonding, and your EMR

What coverage a low-voltage contractor carries, how contract limits and endorsements differ from the legal minimum, how license and project bonds work, and why a new shop has no EMR yet.

2026-10-07 · 14 min read

The previous post treated insurance as a startup cost and noted that new businesses often pay more for it. This post goes further. It covers what coverage a low voltage contractor actually carries, why the answer depends on who the company works for, how bonding works, and why a number most new owners have never heard of, the experience modification rate, can determine which general contractors will let the company bid.

What this post covers

Two sources of requirements. What the law requires, and what customers and general contractors write into contracts. Contract requirements usually exceed the legal minimum.
How limits are read. Per occurrence, general aggregate, products and completed operations, and when an umbrella sits above the primary policy.
Core policies. General liability, commercial auto including hired and non-owned auto, and workers' compensation with class codes and audits. Professional liability, inland marine, and cyber are items to take to a broker.
Endorsements. Certificates of insurance, additional insured, waiver of subrogation, and primary and non-contributory wording.
Bonds. License bonds versus bid, performance, and payment bonds, and what sets a single-project and aggregate bonding capacity.
The EMR. What the multiplier means, why a new company is often non-rated for one to three years, and how to answer a general contractor who asks for a number the company does not have yet.

Two sources of insurance requirements

Insurance requirements come from two different places.

Requirements set by law. Some coverage is mandatory by statute. Workers' compensation is required in most states once a business has employees, although the thresholds and exemptions vary. Commercial auto liability minimums are set by each state for vehicles the business owns. Some licensing boards also require proof of specific coverage, sometimes at minimum limits, before a license is issued or renewed.

Requirements set by contract. Most of the coverage a contractor carries, and nearly all of the limits, are driven by the customers and general contractors it works for. A property manager hiring the company for a small service call may ask only for a certificate of insurance. A large general contractor may require specific coverages, specific limits, and specific policy endorsements before the company is allowed on site, and sometimes before it is allowed to bid.

This distinction matters. Meeting the legal minimum keeps the business compliant. The contracts that produce work usually ask for more than the state requires. When planning coverage, the target customers' requirements are the list to collect, along with the state's.

Understanding coverage limits

Most coverage minimums in commercial contracting start at $1 million. To read what a customer is asking for, the way limits are expressed matters.

Per occurrence limit. The maximum the policy will pay for a single incident or claim.

General aggregate limit. The maximum the policy will pay for all covered claims combined during the policy period, typically one year.

A policy might carry $1 million per occurrence with a $2 million or $3 million general aggregate. That means no single claim will be paid beyond $1 million, and the total of all claims in the policy year will not exceed the aggregate. A contract that requires "$1 million per occurrence, $2 million aggregate" is asking for both numbers, and a policy that meets one but not the other does not satisfy the requirement.

General liability policies often include a separate products and completed operations aggregate, which applies to claims arising from work after it has been finished. For a contractor whose installations remain in a building for years, that coverage matters, and many contracts specify it.

When a contract calls for higher limits than a primary policy provides, an umbrella or excess liability policy is typically used to extend coverage above the underlying limits. Umbrella requirements often grow as the size of the projects grows.

Core coverages for a low voltage contractor

General liability

General liability covers claims that the business caused bodily injury or property damage to others. For a low voltage contractor, that might include a ladder falling on a visitor, a drill bit striking a water line, or damage to a customer's finished ceiling. It is the coverage nearly every customer will ask to see first.

Commercial auto, including hired and non-owned auto

Commercial auto coverage applies to vehicles the business owns. What surprises many new owners is that most customers and general contractors require auto liability coverage even from businesses that do not own a single vehicle.

That requirement is typically met with a hired and non-owned auto (HNOA) endorsement or policy:

Hired auto coverage applies to vehicles the business rents or leases, such as a rental truck for a project.
Non-owned auto coverage applies to vehicles the business does not own but that are used for business purposes, most commonly an owner's or employee's personal vehicle driven to a job site or supply house.

Non-owned auto coverage protects the business from liability arising from an accident in a personal vehicle used for work. It generally does not repair the personal vehicle itself, and the vehicle owner's personal auto policy typically responds first. As noted in Part 5, many personal auto policies also limit coverage for business use, so the vehicle owner's own policy is confirmed as well.

Workers' compensation

Workers' compensation covers employees' medical costs and lost wages when they are injured on the job. Requirements are set by each state, including how many employees trigger the requirement and whether owners or officers may exclude themselves from coverage.

Workers' compensation premiums are calculated from payroll. Each type of work is assigned a class code with a rate, typically expressed per $100 of payroll, and the premium is based on the wages expected in each classification. Because the premium is based on an estimate, it is audited after the policy year ends, and those audits are thorough. If actual payroll is higher than estimated, the business will owe additional premium.

Two points deserve attention:

Classification matters. Payroll is assigned to class codes that match the work employees perform. Misclassification can lead to overpaying premiums or to significant adjustments at audit.
Uninsured subcontractors can become the company's payroll. If the company hires subcontractors who do not carry their own workers' compensation coverage, the auditor may include what was paid to them in payroll for premium purposes. A current certificate of insurance from every subcontractor, collected before they begin work, is what keeps that from happening.

Other coverage to discuss with your broker

Depending on the scope of work and the customers, a broker conversation also covers:

Professional liability (errors and omissions) if the company designs systems or produces drawings and plan sets
Inland marine or tools and equipment coverage for tools, test equipment, and materials in transit or stored on job sites
Cyber liability if the work involves customers' networks, access control databases, or video systems

Contract requirements beyond the limits

General contractors frequently require more than coverage amounts. Common contract requirements include:

Certificate of insurance (COI): a document from the insurer or broker summarizing coverage, often required before the company can bid or start work
Additional insured status: extending liability coverage to protect the general contractor or owner for claims arising from the company's work
Waiver of subrogation: preventing the insurer from pursuing recovery against the general contractor after paying a claim
Primary and non-contributory wording: requiring the company's policy to respond before the general contractor's own insurance

These are provided through endorsements, and not every policy includes them automatically. Before signing a subcontract, the insurance requirements are compared with the actual coverage, and the requirements go to the broker. A gap found after a claim costs more than the same gap found before the job begins.

Bonding

Bonds are often confused with insurance, but they work differently. A surety bond is a guarantee from a surety company that the contractor will meet its obligations. If the contractor fails to do so and the surety pays a claim, the surety will expect the contractor to repay it. Insurance protects the contractor. A bond protects the party requiring it.

For a low voltage contractor, bonding typically comes up in two ways.

License bonds

Some states and localities require a bond as a condition of licensing. A license bond generally guarantees that the contractor will comply with the laws and regulations that apply to its license. It must typically remain in force for as long as the license is held, and it renews on a regular cycle. State requirements are part of the licensing research covered earlier in this series.

Project bonds

Project bonds are tied to a specific project. They are common on public work and on larger private projects, and they include:

Bid bonds, which guarantee that a contractor will enter into the contract at its bid price if selected
Performance bonds, which guarantee that the work will be completed according to the contract
Payment bonds, which guarantee that the contractor will pay its subcontractors, workers, and suppliers

Your bondable limit

When speaking with a surety agent, one of the most useful questions is what the bondable limit, or bonding capacity, will be. Sureties typically express capacity as a single-project limit and an aggregate limit across all bonded work.

Establishing that capacity requires a full financial review. Expect the surety to request business financial statements, often prepared by a CPA, along with personal financial information, a description of experience, and a list of current and completed projects. In many cases, particularly for new businesses, the surety will also require the owner to sign a personal indemnity agreement, which acts as a personal guarantee to repay the surety for any losses on a bond.

As with licensing limits discussed in Part 3, bonding capacity grows with the company's financial strength and track record. A new business typically starts with modest capacity. Financial statements, retained earnings, and project history are what later capacity is built from.

The experience modification rate (EMR)

Of everything in this post, the experience modification rate is the item most likely to catch a new contractor off guard, and it can shape the business's growth for years.

What the EMR is

The EMR, also called an experience mod or e-mod, is a rating tied directly to workers' compensation. It compares a company's actual workers' compensation claims with the expected claims for businesses of similar size and type. In most states, it is calculated by the National Council on Compensation Insurance (NCCI); a few states use their own rating bureaus.

The number works as a multiplier:

1.0 represents the industry average.
Below 1.0 indicates a better-than-average record and reduces workers' compensation premiums. A 0.85, for example, results in a 15 percent reduction.
Above 1.0 indicates a worse-than-average record and increases premiums. A 1.2 results in a 20 percent increase.

Why it matters beyond workers' compensation

The EMR directly affects workers' compensation premiums, and its influence extends further:

Insurance renewals. Insurers across multiple lines of coverage often ask for the EMR at renewal, and it can influence the rates and terms offered.
Prequalification. A large share of general contractors require an EMR as part of their prequalification process, and many set a maximum acceptable rating. Without an acceptable EMR, a subcontractor may not be able to join a general contractor's bid list at all.
Reputation. An EMR is one of the few objective measures of a company's safety performance, and customers use it to compare subcontractors.

The catch-22 for new businesses

A new business does not have an EMR, and it cannot get one quickly.

An EMR is based on the company's own workers' compensation history, so a business carries a workers' compensation policy to begin building one. The calculation is generally based on several years of payroll and claims data and typically excludes the most recent policy year. In addition, the business's premium must meet a minimum eligibility threshold set for its state. As a result, many new businesses do not receive an EMR for one to three years, and a business with a very small payroll may not qualify for a rating at all until it grows.

That is a planning constraint. Carrying a workers' compensation policy before the first hire is what starts the history the EMR depends on, including for an owner who is permitted to exclude themselves and who has no employees yet. The policy also provides the certificate of coverage that many general contractors require before they will consider a subcontractor. Every month without a policy is a month added to the time before the company can be rated.

Plan your timeline around it

If the plan is to eventually pursue larger general and electrical contractors, the timeline runs backward from that goal. The broker is the source for how the rating rules apply in that state, what premium threshold applies, and when the business could realistically expect its first EMR. The workers' compensation policy starts early enough that the business has a rating, or is close to one, by the time it approaches the contractors that require it.

What to say before you have one

When a general contractor asks for an EMR before the company has been rated, calling it 1.0 implies an official rating exists, and the contractor may ask for a rating worksheet the company cannot provide. The status to report is non-rated, or "1.0 non-rated," with the explanation that the company has not yet met the state's time or premium requirements for an experience rating. Some general contractors will accept this, particularly for smaller projects, and the insurer or broker can often provide a letter confirming the company's status. Others will not, which is why the timeline is planned in advance.

Protecting your EMR once you have it

Once the business has an EMR, it is a number with a multi-year memory. A strong safety program, proper training, and a job-site practice that treats safety as part of the work all reduce claims, and fewer claims mean a lower EMR. Because the calculation reflects several years of history, a single serious injury can affect the rating, and the company's ability to bid, for years afterward.

Bringing it together

Insurance, bonding, and the EMR are three of the least visible parts of running a low voltage business, and three of the most consequential. The right coverage at the right limits keeps the business protected and eligible for the work it wants. Bonding capacity determines whether it can pursue public and larger private projects. The EMR, which cannot be rushed, determines when the doors to many general contractors open.

The common thread is planning. Target-customer requirements, an independent broker who understands the trade, the financial history a surety will want to see, and a workers' compensation policy started early enough that the EMR exists when the business is ready to use it.

Next in this series: safety programs and OSHA requirements.

Planning and device counts are numbers. Those live on the calculators. Office takeoff, proposal files, and Bluebeam chests are a later storefront. The rest of this series is on the business setup page.

Sources

The Owner binder compiles this series into one PDF. It is on the binders page.