How to Verify Your Commercial Window Cleaner's Insurance and Safety Record

Updated Jul 2026 · 5 min read

The liability most buyers overlook

When a crew is suspended on ropes or working from a boom lift outside your building, the company that hired them can be named in any claim that follows an accident. For a property manager or business owner, vetting a window cleaner's insurance and safety record deserves as much attention as comparing quotes. The lowest bid often comes from the contractor carrying the least coverage, and that gap becomes your problem the moment someone gets hurt or a pane of storefront glass ends up on the sidewalk.

This guide walks through the documents to request, how to read them, and the warning signs that a provider is cutting corners you will pay for later.

Ask for a certificate of insurance, then actually read it

Every serious commercial window cleaning company can produce a certificate of insurance, usually called a COI. Do not accept a verbal assurance or a logo on a truck as proof. Request the certificate in writing before any work is scheduled, and look at three things on it.

First, general liability. This covers property damage and third-party injury, such as a dropped squeegee cracking a windshield in your parking structure. Second, workers' compensation. If a cleaner falls and there is no workers' comp behind them, an injured worker's attorney may look to the property owner for recovery. Third, the coverage dates. A certificate that expired last quarter tells you the company is not tracking its own policies closely.

One detail separates careful buyers from the rest: ask to be listed as an additional insured on the general liability policy, and ask for the certificate to be sent directly from the insurance broker rather than forwarded by the contractor. A broker-issued document is far harder to alter, and additional-insured status extends the policy's protection to you rather than leaving you on the outside of it.

Confirm the coverage matches the height and method

Insurance is not one-size-fits-all. A company that only cleans ground-floor storefronts carries a different risk profile than one rappelling down a twenty-story tower. If your building requires rope descent, suspended scaffolding, or aerial lifts, confirm the policy does not exclude those methods. Some general liability policies quietly carve out high-access work, which means the coverage you were shown may not apply to the job you are actually buying.

For high-rise or mid-rise work, ask directly whether the crew is trained on the access method your building uses and who supplies and inspects the rigging. A provider that owns its equipment and maintains it tends to have fewer surprises than one renting a lift for the day and improvising.

Look at the safety record, not just the paperwork

Coverage tells you what happens after an incident. A safety record tells you how likely an incident is in the first place. For rope and lift work, that record is worth requesting.

Many commercial contractors track an experience modification rate, often called an EMR, which insurers use to compare a company's claims history against the industry norm. A company willing to share its EMR is signaling that its history is clean. You can also ask whether the crew follows OSHA's fall protection requirements for the access method involved, since those standards govern how workers are anchored and protected at height. A provider that can speak specifically about how its people are tied off and trained is a better bet than one that changes the subject.

Ask two plain questions. Has the company had a serious incident in recent years, and what changed afterward? An honest answer to the second question often reveals more about a company's culture than a spotless claim to have never had a problem.

Watch for the warning signs

A few patterns should slow you down before you sign.

A contractor who resists putting insurance details in writing, or who sends a certificate only after repeated requests, is showing you how they will handle a dispute later. A bid that sits well below every other quote usually means something was left out, and coverage is a common thing to leave out. Vague answers about who employs the crew can signal that workers are misclassified as contractors to avoid carrying workers' comp, which pushes risk back onto you.

None of these are automatically disqualifying on their own, but together they describe a company competing on price by shifting liability rather than by running a tighter operation.

Put the requirements in the agreement

Once you have vetted a provider, the protection only holds if it is written down. A commercial cleaning agreement should state the minimum coverage the contractor must carry, require that you be added as an additional insured, and obligate the company to notify you if a policy lapses or is cancelled mid-term. Requiring a fresh certificate at each renewal keeps the coverage current instead of letting it quietly expire between visits.

This is where insurance vetting connects to the rest of your due diligence. The questions you ask before hiring, the scope you define, and the coverage you verify all belong in the same document so nothing depends on memory or goodwill.

The short version

Treat insurance and safety as a screening step, not a formality you clear at the end. Get a broker-issued certificate, confirm general liability and workers' comp are both in force and cover the access method your building needs, ask to be named as additional insured, and request the safety record for any work done at height. A reputable commercial window cleaning company will hand these over without friction. The one that hesitates is telling you exactly why you should keep looking.