What insurance do GCs require from scaffolding subcontractors?

Typically $1M/$2M general liability (often $5M-$10M total with excess on larger projects), additional insured endorsements for both ongoing operations (CG 20 10) and completed operations (CG 20 37), primary and non-contributory wording, waivers of subrogation on GL and workers' comp, $1M auto, and statutory comp with $1M employer's liability.

Why do scaffolding contractors' certificates get rejected?

The scaffold-specific killer is policies with height caps or erection/dismantling exclusions that contradict the work being certified - reviewers read the endorsement schedule. Other common causes: missing completed-ops additional insured, eroded aggregates without per-project endorsements, excess layers that don't follow form, and named-insured mismatches.

What is a per-project aggregate endorsement?

An endorsement giving each project its own full general aggregate limit instead of sharing one annual aggregate across every job. For scaffold subs running multiple simultaneous projects, it prevents a busy season from silently exhausting the limit a certificate promises.

How long must scaffold subs maintain completed-operations coverage?

Per the contract - commonly 3 years after completion, and prudent practice matches the state's statute of repose (up to 10 years in some states) since scaffold-related claims can surface long after dismantling. The CG 20 37 completed-ops additional insured endorsement must stay alive across renewals for that period.

Certificates of Insurance for Scaffolding Contractors: What GCs Verify (and Why Scaffold COIs Get Bounced)

By Tamir Lerner, CA License #6012320 · Scaffold Insurance Pros · Updated August 2026

Quick answer: GCs bounce scaffold subs' certificates for four reasons: missing additional insured endorsements for BOTH ongoing and completed operations (CG 20 10 + CG 20 37 or equivalents), limits below the contract's $1M/$2M-plus-excess requirement, no primary & non-contributory wording, and — the scaffold-specific killer — policies whose erection/height exclusions contradict the work being certified. Your COI is a promise the GC's risk manager will verify against endorsements; make the paper match the policy and the policy match the scaffold.

Scaffolding subs live downstream of everyone's risk management: you're the trade whose work every other trade stands on, so GCs scrutinize your certificate like a structural calc. Here's what they check in 2026, why scaffold COIs fail more than other trades', and the package that passes first submission.

The standard checklist every GC runs

Item	What they want to see
GL limits	$1M occurrence / $2M aggregate minimum; $5M–$10M total with excess on larger projects
Additional insured — ongoing ops	CG 20 10 (or equivalent) naming GC + owner
Additional insured — completed ops	CG 20 37 — scaffolding claims outlive the erection crew
Primary & non-contributory	Endorsed, not implied
Waiver of subrogation	GL + workers' comp
Auto + comp + excess	$1M auto; statutory comp with employer's liability $1M

Why scaffold COIs specifically get bounced

The height/erection exclusion contradiction. Budget policies for "scaffolding contractors" sometimes carry height caps or erection/dismantling exclusions — the GC's reviewer reads the endorsement list and rejects a certificate whose underlying policy excludes the very work being contracted. What your policy must affirmatively cover: erection, dismantling, and left-in-place.
Left-in-place ambiguity. Sophisticated GCs ask who insures the scaffold between your demobilization and re-mobilization — have the answer in writing.
Aggregate erosion. A $2M aggregate spread across a busy season can be half-eaten by October; per-project aggregate endorsements solve what a mid-year certificate can't hide.
Excess that doesn't follow form. A $5M excess layer that doesn't follow the AI/primary wording of the primary is a $5M decoration; reviewers increasingly check.

What the contract language actually obligates you to

The insurance exhibit is a contract term: "maintain for 3 years after completion," "limits not less than," "endorsements attached to certificate." Read three clauses hard: the duration of completed-ops AI (statutes of repose run 10 years in some states — your policy renewal cycle must keep the endorsement alive), the indemnification clause (your insurer defends contractual liability only as far as the policy's insured-contract definition), and scaffold-specific hold harmless terms where other trades will load your equipment (coordinate with who-pays-in-a-collapse reality). OSHA's Subpart L duties don't shift by contract — the competent-person requirement stays yours: OSHA scaffolding.

The package that passes first review

COI + attached endorsements (AI ongoing + completed ops, P&NC, waivers) — never "endorsements available on request."
Blanket AI endorsements on your program so each new GC doesn't cost $150 and a week.
Per-project aggregate if you run multiple jobs.
Excess certificates showing follow-form language.
Consistent named insured across GL/auto/comp/excess — DBA mismatches are silent rejections.
Comp certificate with the waiver — and a comp program priced right (scaffold comp guide).

Cost context for the whole stack is in our 2026 requirements guide, and the premium levers in why scaffold GL costs what it does.

The bottom line

A scaffold sub's certificate is a compliance product: the GC isn't judging your safety record at COI review — they're pattern-matching endorsements. Build the package once (blanket AI, per-project aggregate, follow-form excess, no exclusion contradictions), and first-submission approval becomes your default instead of your lucky day.

Certificate stuck in the GC's review queue?

Scaffold Insurance Pros builds compliance-ready programs: blanket additional insured, per-project aggregates, follow-form excess, and no exclusion contradictions - so your COI passes the first submission.

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General information only, not legal or coverage advice. Class codes, rates, and statutory requirements change and vary by carrier, state, and policy period. Scaffold Insurance Pros is operated by Thrive Risk Management Insurance Solutions, Inc., CA License #6012320. Confirm current requirements with a licensed agent.