Tiered Subcontractor Compliance for Large Projects

TL;DR: On projects with 50+ subs, tier compliance into three bands: Tier 1 high-risk scopes (structural, electrical, mechanical, roofing, excavation, demolition, crane) get full documentation plus higher limits and bond requirements, Tier 2 trades (finishes, framing, specialty) get standard $1M/$2M CGL with CG 20 10, CG 20 37, PNC, and WoS, and Tier 3 low-risk vendors get a lighter package. Tiering keeps total workload manageable without under-scrutinizing catastrophic-loss scopes.

On a large construction project with dozens or hundreds of subcontractors, treating every sub the same creates two problems at once: you over-scrutinize low-risk subs (wasting time) and under-scrutinize high-risk subs (taking risk you shouldn't). Tiered compliance is the standard solution. Higher-risk subs get more rigorous diligence, lower-risk subs get proportional treatment, and total compliance workload stays manageable.

This post walks through how to build and apply a tiered compliance program on large projects.

Why Tiering Matters on Large Projects

A mid-sized commercial project might have 15 subs. A large commercial project might have 50 to 100 subs. A megaproject might have hundreds of subs across multiple tiers of sub-subcontractors. At that scale, treating every sub to the same level of compliance review means one of two things:

1. Everyone gets light review, which leaves exposure on high-risk work (structural, electrical, mechanical, roofing, excavation)
2. Everyone gets heavy review, which consumes more compliance staff time than the GC can realistically afford and slows project mobilization

Tiered compliance threads the needle: apply the right level of rigor to the right risk, and the total workload becomes manageable without accepting undue exposure on high-stakes work.

A Three-Tier Model

The simplest and most widely-used approach is three tiers based on risk exposure.

Tier 1: High Risk

Subs whose work carries significant liability exposure or could cause catastrophic losses. Examples:

• Structural steel and concrete
• Electrical (including service connections and specialty systems)
• Mechanical (HVAC, plumbing, fire protection)
• Excavation and foundations
• Roofing and building envelope
• Elevators and vertical transportation
• Demolition
• Hazardous material abatement
• Crane and rigging operations

Tier 2: Moderate Risk

Subs whose work has normal liability exposure. Examples:

• Finish trades (drywall, paint, flooring, tile)
• Framing and general carpentry
• Specialty finishes
• Casework and millwork
• Landscape and site finishes
• General cleaning during construction

Tier 3: Low Risk

Subs whose work has minimal liability exposure. Examples:

• One-time deliveries
• Temporary fencing installation
• Testing and inspection services
• Minor site cleanup
• Snow removal
• Signage installation

Compliance Requirements by Tier

Each tier has a different set of required documents and verification depth.

Tier 1 Requirements

Documents:

• Commercial General Liability with project-appropriate limits (often $5M+ per occurrence on large projects)
• Workers' Compensation at statutory limits with Employer's Liability
• Auto Liability and Umbrella / Excess Liability
• Specialty coverage where applicable (pollution, professional, product)
• Additional Insured endorsement pages (CG 20 10 and CG 20 37), not just COI references
• Primary and Non-Contributory (CG 20 01 or built-in)
• Waiver of Subrogation (CG 24 04 and WC 00 03 13)
• Signed subcontractor agreement with full indemnification
• W-9 and legal entity verification
• Contractor licensing with classification matching the work
• Safety records (EMR, OSHA citations, loss runs)
• Financial stability documentation (bonding capacity, references)
• Written safety plan
• OSHA 10 or 30 for all workers

Verification:

• Full policy review by risk manager or broker
• Endorsement page verification
• Certificate authenticity verification with the sub's producer
• Background check of company history and claim experience
• Periodic monitoring during the project

Tier 2 Requirements

Documents:

• Commercial General Liability at standard limits ($1M/$2M)
• Workers' Compensation at statutory limits
• Auto Liability
• Umbrella / Excess Liability where project requires
• Additional Insured endorsements (CG 20 10 and CG 20 37)
• PNC and Waiver of Subrogation
• Signed subcontractor agreement
• W-9
• Contractor licensing where applicable
• Basic safety performance documentation

Verification:

• Layer 1 and Layer 2 verification per our 3-layer approach
• COI review plus endorsement page review
• Standard monitoring during the project

Tier 3 Requirements

Documents:

• Commercial General Liability at appropriate limits
• Workers' Compensation or exemption
• Auto Liability
• Basic Additional Insured language on COI
• Signed service agreement (often a simple PO with attached terms)
• W-9

Verification:

• Layer 1 verification (COI review)
• Basic monitoring

How to Assign Subs to Tiers

Tier assignment happens at the start of the relationship, ideally before the subcontract is signed. The key inputs:

Scope of Work

The single most important factor. A sub doing structural steel is always Tier 1 regardless of contract size. A sub delivering rental port-a-potties is Tier 3 regardless of contract size.

Contract Value

Larger contracts warrant more scrutiny even when the work is moderate-risk. A $2M framing contract should probably get closer to Tier 1 attention than a $50K finish trade.

Regulatory Requirements

Work subject to specific regulations (OSHA PSM, environmental, DOT) often elevates the tier because of the regulatory exposure.

Sub's Track Record

New subs warrant more scrutiny. Long-term trusted subs can sometimes operate a tier lower than their work category would suggest.

Owner Requirements

The owner's insurance program may specify minimum requirements that effectively set tier floors. Pay attention to contract requirements that cascade to all subs regardless of your tiering.

Common Tiering Mistakes

Mistake 1: Treating Contract Value as the Only Factor

A low-value contract for high-risk work is still high-risk. Don't let contract size determine tier.

Mistake 2: Never Revisiting Tier Assignments

A sub's tier may change over time as their track record develops or their scope expands. Revisit tier assignments on major contract amendments.

Mistake 3: Inconsistent Application

If project managers apply the tiering inconsistently, the whole system breaks down. Document the criteria and train PMs.

Mistake 4: Tiering Only for Large Projects

Smaller projects benefit from lightweight tiering too. Even a project with 10 subs can distinguish between the 2 high-risk subs and the 8 others.

Mistake 5: Under-Tiering to Reduce Compliance Work

Tempting but backward. Under-tiering means the highest-risk work gets the least scrutiny, which is exactly wrong.

Operationalizing Tiers in Software

A compliance platform should support tiered requirements so the workflow matches the policy. Specifically:

• Each sub record has a tier assignment (or is tagged with a risk category)
• Required document types differ by tier
• Verification workflows differ by tier (which users approve which documents, what reviews are required)
• Reports filter by tier so you can see compliance status at each level separately

PaperBoss supports this through custom fields and document type configurations on Pro and Business plans. You can configure required documents per tier, tag subs at onboarding, and report on compliance status by tier so the highest-risk subs get priority attention in reviews.

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Frequently Asked Questions

How many tiers should I use?

Three is standard. Two is too coarse for large projects. Four or five creates complexity that's hard to maintain consistently.

Does tiering affect subcontract terms?

Often yes. Higher-tier subs usually have stricter insurance requirements and more comprehensive indemnification clauses in the subcontract. Lower-tier subs may have simpler contracts appropriate to the risk.

Can a sub be in different tiers on different projects?

Yes. A sub doing structural work on one project might be Tier 1, while doing minor repairs on another might be Tier 2 or 3. Tier assignments should be project-specific, not vendor-global.

Should I tell subs what tier they're in?

Not necessarily by name, but the compliance requirements make the tier obvious. A sub who sees a 30-item required document list knows they're being treated as high-risk.

Does tiering reduce my overall compliance exposure?

Only if you apply higher rigor to Tier 1 subs than you would have without tiering. The point isn't to reduce total compliance work; it's to apply the right level of scrutiny to the right risk.

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This article is for educational purposes only and does not constitute legal or insurance advice. Consult a construction attorney or risk management professional for tier design specific to your operation.