Cheap general liability insurance for contractors is one of the most searched insurance terms in the construction industry. That search volume tells a clear story: contractors are trying to minimize insurance costs. The problem is that cheap CGL policies protect the sub's wallet, not your project. When a sub buys bargain-basement coverage, you absorb the risk they shed.

According to 2024 data from the National Council on Compensation Insurance, the average general liability claim in construction runs between $35,000 and $85,000. A single serious bodily injury claim can exceed $500,000. When a sub's cheap policy fails to cover these amounts, the GC's insurance picks up the difference.

This analysis breaks down the seven most common mistakes GCs make when their subs carry cheap GL coverage, what gets cut in low-cost policies, and how to protect yourself.

Mistake 1: Accepting Low Aggregate Limits

The most common cost-cutting tactic in cheap CGL policies is reducing the general aggregate limit. Standard policies carry $2M aggregates. Cheap policies drop to $1M or even $500,000.

Why it matters. The aggregate is the maximum the policy pays for all claims in a policy period. A sub working on three projects simultaneously shares their aggregate across all three. One $400,000 claim on another project reduces available coverage for your project to $100,000 on a $500,000 aggregate.

Real numbers. A concrete sub with a $500,000 aggregate policy works on your $5M commercial project. A worker from another trade trips on the sub's form work and suffers a back injury. The claim settles for $175,000. The sub already had a $350,000 property damage claim on a different project that year. Their aggregate is exhausted. Your project gets $150,000 from the sub's policy. You cover the remaining $25,000 from your own insurance.

What to do. Require a minimum $2M general aggregate from every sub. For high-risk trades, require $4M. Request loss runs covering the current policy period to verify remaining aggregate capacity.

Mistake 2: Ignoring Restrictive Additional Insured Endorsements

Cheap policies often include watered-down additional insured endorsements that limit when and how the GC receives coverage.

Standard additional insured endorsements (CG 20 10 for ongoing operations, CG 20 37 for completed operations) provide broad protection. Cheap policies substitute restrictive alternatives.

Endorsement Type	What It Does	Risk to GC
CG 20 10 (standard, 2004 edition)	Covers GC for liability arising from sub's ongoing work	Low risk. Broad protection
CG 20 10 (2019 edition)	Limits coverage to injury caused "in whole or in part" by sub	Moderate risk. Requires proving sub's fault
CG 20 33	Only covers GC if written contract requires it	Low risk if contract is in place
Blanket AI with $100K sublimit	Caps AI coverage at $100K regardless of policy limits	High risk. $100K cap on a $1M policy
Manuscript endorsement	Carrier-specific language, often highly restrictive	High risk. Must read the exact language

What to do. Request the actual endorsement document, not just the certificate. Read the additional insured endorsement language. Reject any endorsement that sublimits coverage below your policy requirements or restricts the trigger to only the sub's sole negligence.

Mistake 3: Overlooking Excluded Operations

Cheap policies often exclude specific types of construction operations to lower the premium. The certificate of insurance will show the policy is active, but a claim arising from the excluded operation will be denied.

Common exclusions in cheap policies:

Exterior work above 15 feet (excludes roofing, siding, facade work)
Hot work (welding, cutting, brazing)
Work within 50 feet of railroad tracks
Excavation below 10 feet
Blasting and demolition
Lead or asbestos abatement
Work on residential properties (condos, apartments)

Example. A roofing sub buys a cheap CGL policy with a height exclusion for work above 15 feet. They install a roof on your 3-story commercial building at 35 feet. A shingle falls and injures a pedestrian. The claim is denied because the height exclusion applies. The GC's policy responds instead.

What to do. Request the full list of policy exclusions from the sub's broker. Compare excluded operations against the sub's scope of work on your project. Reject any policy that excludes the specific work the sub will perform.

Mistake 4: Missing Waiver of Subrogation

A waiver of subrogation prevents the sub's insurer from suing you after paying a claim. Without it, a sub's insurer can pay a $200,000 claim, then turn around and sue you to recover that money.

Cheap policies often omit the waiver of subrogation endorsement to save $50 to $200 in annual premium. That savings creates unlimited potential liability for the GC.

How subrogation works against you. A sub's employee drops a tool that injures a visitor. The sub's CGL pays $150,000. Without a waiver of subrogation, the sub's insurer investigates and determines that the GC failed to maintain a safe perimeter. The insurer files a subrogation claim against the GC for $150,000. Now the GC's insurance must defend and potentially pay the full claim amount.

What to do. Require waiver of subrogation endorsements on every sub's CGL policy. Verify the endorsement is in place on the certificate of insurance. The ACORD 25 has a specific box for waiver of subrogation. If it is not checked, the endorsement is likely missing.

Mistake 5: Accepting Claims-Made Instead of Occurrence

Claims-made CGL policies cost 25% to 40% less than occurrence policies in the first year. That price difference makes them attractive to cost-conscious subs. They also create a ticking time bomb for GCs.

The gap problem. A sub carries a claims-made policy during your project. They finish work in June. They switch to a different insurer in January. The old claims-made policy only covers claims filed while active. The new policy may exclude incidents that occurred before its effective date. A construction defect surfaces in March. Neither policy covers the claim.

Tail coverage cost. Claims-made policies require "tail" coverage (extended reporting period) to cover claims filed after the policy ends. Tail coverage costs 150% to 200% of the annual premium. A sub paying $3,000 for a claims-made CGL would need $4,500 to $6,000 for tail coverage. Most subs who buy cheap policies skip the tail entirely.

What to do. Require occurrence-based CGL policies from every sub. If a sub insists on claims-made, require a retroactive date that predates their first day on your project and tail coverage for at least three years after project completion.

Mistake 6: Not Checking Products-Completed Operations

Cheap policies often exclude or severely limit products-completed operations coverage. This coverage responds to claims arising from work after the sub finishes their scope.

The timeline problem. A sub finishes plumbing rough-in in March. The building receives a certificate of occupancy in September. In December, a pipe joint fails and floods three floors. Products-completed operations coverage handles this claim. If the sub's cheap policy excluded it, the GC absorbs the loss.

Claim Timing	Products-Completed Ops Coverage	Sub's Cheap Policy (No PCO)	Who Pays?
During active work	Not triggered, ongoing ops applies	Covered	Sub's insurer
After sub finishes, before project completion	Products-completed ops	Denied	GC's insurer
After project completion	Products-completed ops	Denied	GC's insurer
5 years after project completion	Products-completed ops (if no sunset)	Denied	GC's insurer

What to do. Verify that products-completed operations is included in the sub's CGL with a separate aggregate of at least $2M. Check for sunset clauses that limit coverage to less than the statute of repose in your state.

Mistake 7: Treating the Certificate as Proof of Coverage

The biggest mistake is assuming that a certificate of insurance equals adequate coverage. A certificate is a snapshot, not a guarantee. It can be outdated the day after it is issued.

What a certificate does not tell you:

Whether the policy has been canceled since the certificate was issued
How much of the aggregate has been used
The full list of exclusions on the policy
The exact language of the additional insured endorsement
Whether the sub has unpaid premiums that could trigger cancellation

What to do. Verify coverage directly with the carrier at least annually. Request loss runs to check aggregate erosion. Collect actual endorsement pages rather than relying on the certificate description. Set up automated monitoring that alerts you to cancellations and non-renewals.

The True Cost of Cheap GL Insurance

When a sub's cheap policy fails, the GC pays through multiple channels.

Direct insurance costs. Claims against your own CGL policy increase your experience modification rate and future premiums. One $200,000 claim can increase your annual premium by $15,000 to $40,000 for three to five years.

Legal defense costs. Even if your policy covers the claim, you spend management time on depositions, discovery, and litigation coordination. Average legal defense cost for a construction CGL claim runs $35,000 to $75,000.

Project delays. A serious on-site incident triggers OSHA investigation, work stoppage, and schedule disruption. A single week of delay on a $10M project costs roughly $50,000 in extended general conditions.

Reputation damage. An uninsured or underinsured claim creates subcontractor disputes, owner concerns, and surety questions that follow your firm across future projects.

We built SubcontractorAudit to catch these problems before they become claims. The platform verifies limits, detects restrictive endorsements, flags missing waiver of subrogation language, identifies claims-made policies, and confirms products-completed operations coverage automatically.

Frequently Asked Questions

How can I tell if a sub's GL policy is "cheap" just from the certificate? Look for three red flags: limits below $1M/$2M, a claims-made trigger instead of occurrence, and missing endorsements (no additional insured, no waiver of subrogation, no primary/non-contributory). Any one of these signals a cut-rate policy.

What is the average CGL premium for a construction subcontractor? CGL premiums vary by trade. Concrete and masonry subs pay $3,500 to $8,000 per year for $1M/$2M coverage. Roofing subs pay $8,000 to $15,000. Electricians pay $2,500 to $5,000. Policies significantly below these ranges likely carry restrictive endorsements or exclusions.

Can I require a specific carrier or AM Best rating? Yes. Most GC subcontracts include a clause requiring carriers rated A- VII or better by AM Best. This eliminates surplus lines carriers and non-admitted insurers that often sell cheap policies with weaker claims-paying records.

What if a sub refuses to upgrade their coverage? You have two options. First, require the sub to obtain compliant coverage as a condition of the subcontract. Second, if the sub is critical to your project and cannot obtain better coverage, consider adding them to your own policy through a subcontractor endorsement, then back-charging the premium.

Does cheap GL insurance always mean bad coverage? Not always, but almost always in construction. A sole proprietor painter working on small residential projects might find adequate coverage for $800 per year. But any sub performing structural, mechanical, or high-risk work on commercial projects needs robust coverage that cheap policies cannot provide.

Should I require umbrella policies in addition to CGL? Yes, for any sub working on projects over $1M. An umbrella policy provides excess limits above the CGL. Require at least $2M umbrella for standard trades and $5M for high-risk trades. The umbrella should follow form over the CGL and auto policies.