Additional Insured Endorsement Guide

If you do any commercial landscape work in Florida — HOAs, property managers, general contractors, municipal grounds — you've been asked for an "additional insured endorsement" (AIE). This guide explains exactly what it is, why it matters, and how to make sure your COI doesn't get rejected.

What is an additional insured endorsement?

An additional insured endorsement is an attachment to your general liability (GL) policy that extends your insurance to also cover another party — typically a property owner, HOA, GC, or property manager — for liability arising out of your operations. Without an endorsement, only your business is insured under the policy. With one, the customer named on the endorsement gets to defend and indemnify themselves under your policy if they're sued because of something your crew did (or failed to do).

Critically: being listed on the certificate of insurance (COI) is not the same as being an additional insured. The COI is a summary; the endorsement is the actual policy form that grants coverage. Property managers learned this the hard way after years of denied claims, which is why most Florida commercial contracts now require you to attach the endorsement form itself — not just write the customer's name in the COI's holder box.

Why it matters for landscape contractors

Landscape and hardscape work generates more "third-party named" lawsuits than most contractors realize:

A mower flings a rock through an HOA resident's car windshield → the HOA gets sued because they hired you.
Your tree crew drops a limb on a parked Tesla in a property manager's lot → the property manager is named in the suit.
An irrigation line you installed ruptures under a clubhouse two years after the job → the GC who built the clubhouse is named for selecting you as the sub.
A pesticide drift kills an adjacent property's koi pond → the customer who hired you is named for choosing your firm.

In every case, the upstream party (HOA, property manager, GC) wants your insurance to defend them, not their own. That's exactly what the additional insured endorsement does. If you don't have one — or you have the wrong one — they pay out of pocket, then sue you for indemnity. You lose the contract and the lawsuit.

The forms: CG 20 10, CG 20 37, and the famous 11/85 edition

CG 20 10 — Ongoing operations

Covers the additional insured for liability that arises while you are still working on the project. Once you finish and leave, this form stops applying.

CG 20 37 — Completed operations

Covers the additional insured for claims that surface after the job is finished. For landscapers this is essential: paver settlement, irrigation leaks, tree-failure claims, and root damage routinely show up 6 months to 5 years post-completion.

CG 20 10 11/85 — The "gold standard" old edition

The 1985 edition combined ongoing + completed operations on one form and covered the additional insured's sole negligence. ISO removed sole-negligence coverage in 2004. Most carriers no longer offer 11/85; if a contract demands it by name, push back and offer modern CG 20 10 + CG 20 37 instead.

The supporting endorsements you almost always need with it

CG 20 01 — Primary & non-contributory. Forces your policy to pay first, before the customer's own insurance. Without this, your carriers split the loss and claim payment slows.
Waiver of subrogation (CG 24 04). Stops your carrier from suing the customer to recoup money it paid out. Required by ~90% of Florida commercial contracts.
30-day notice of cancellation. Most contracts require the customer be notified before your policy cancels — usually 30 days, sometimes 60.

What a contract usually requires (verbatim language)

"Contractor shall name Owner, its parent, subsidiaries, affiliates, officers, directors, employees, and agents as additional insureds on Contractor's commercial general liability policy on a primary and non-contributory basis, using ISO forms CG 20 10 and CG 20 37 (or equivalent), including completed operations coverage maintained for not less than three (3) years following completion of the Work."

Read every clause carefully. The two most expensive mistakes are: (1) missing the three-year completed-ops tail, which means you have to keep the customer named after the job ends; and (2) accepting a "primary, non-contributory, and including the additional insured's sole negligence" requirement, which most modern carriers will not write.

How to read your COI

On a standard ACORD 25 certificate, look for these markers:

The "Description of Operations" box (lower section) should list the customer by name and reference the form numbers — e.g. "ABC Property Mgmt is named additional insured per CG 20 10 04/13 and CG 20 37 04/13, primary and non-contributory per CG 20 01."
The "Certificate Holder" box (bottom) is just an address for delivery — being listed there alone does not grant additional insured status.
If a customer rejects your COI, 9 times out of 10 it's because the form numbers are missing from the Description of Operations box.

Common mistakes that get COIs rejected

Listing the customer only as Certificate Holder, with no AIE attached.

Including CG 20 10 (ongoing ops) but forgetting CG 20 37 (completed ops). Settlement and tree claims will be denied.

Using a 'blanket' AIE form when the contract requires named attachment.

Promising the 11/85 edition when your carrier only writes 04/13.

Forgetting to add Primary & Non-Contributory (CG 20 01).

Letting the endorsement lapse mid-project at renewal.

What it costs to add

Most Florida carriers add a per-certificate AIE for $25–$75, or a blanket AIE endorsement covering all written contracts for $250–$500/year. If you bid more than 6 commercial jobs a year, the blanket endorsement pays for itself immediately. Primary & non-contributory and waiver of subrogation each typically run $50–$150/year.

The bottom line

If you bid commercial work in Florida, your standard package should include: CG 20 10 (ongoing ops) + CG 20 37 (completed ops) + CG 20 01 (primary & non-contributory) + waiver of subrogation, all maintained for at least 3 years post-completion. Anything less and you'll either lose the contract or end up uninsured on the claim that matters.

Additional insured endorsement: the form that wins (or loses) you commercial work.