What Should a Custom Homebuilder Require in a Subcontractor Agreement and COI?

Start With the Agreement, Not the Certificate

Custom homebuilding is not one trade on one job. A builder may coordinate framing, roofing, electrical, plumbing, HVAC, excavation, masonry, and finish carpentry across several homes at different stages of completion. Each trade can create different liability exposures.

A subcontract sets out the scope of work and the parties’ obligations. A certificate of insurance, or COI, reports certain policy details. An endorsement may change who receives protection and when. These documents work together, but they are not interchangeable.

What the Subcontract Should Actually Require

The right provisions depend on the trade, project, owner requirements, and the builder’s own insurance program. Before a subcontractor starts, the written agreement should address:

• Required insurance and limits. Identify commercial general liability and any other coverage relevant to the work, with clear minimum limits.
• Additional insured status. Identify the parties intended to be added and the scope of required protection.
• Ongoing and completed operations. Explain whether protection is needed during work and after the work is finished, including duration where required.
• Primary and noncontributory wording. Clarify the intended order of response where the relevant policy and endorsements support it.
• Waiver of subrogation. Identify whether a waiver is required and for whose benefit, subject to policy terms.
• Indemnification. Have construction counsel review responsibility allocation and enforceability under North Carolina law.
• Verification and renewals. State what evidence must be delivered before mobilization and how expiration dates and deficiencies will be handled.
• Changes in scope and lower-tier trades. Trigger a new review when the work, project, or subcontracting arrangement changes.

A blanket form applied to every trade may create unnecessary friction for a lower-hazard operation while still missing a meaningful exposure on excavation, roofing, or structural work.

Review General Liability Beyond the Dollar Limit

Commercial general liability (CGL) may respond to qualifying third-party bodily injury or property damage claims, subject to policy terms, limits, conditions, and exclusions. It is not a warranty that every defect or the cost of correcting faulty work will be covered.

When reviewing subcontractor CGL requirements, pay attention to the each-occurrence limit, general aggregate, products-completed operations aggregate, deductibles or self-insured retentions, exclusions that affect the trade, and whether additional limits are needed through umbrella or excess insurance.

For high-value custom homes, a loss can reach beyond the immediate area where the trade was working. That is a reason to review severity and contract requirements, not a reason to impose an arbitrary universal limit on every subcontractor.

Additional Insured: Ongoing Work Is Not the Same as Completed Work

A builder may require additional insured status for certain liability claims arising out of the subcontractor’s work. The actual additional insured endorsement controls the protection available, along with the rest of the policy.

Ongoing operations

These provisions address certain claims during the subcontractor’s active operations, subject to their wording and exclusions.

Completed operations

These provisions can matter when damage allegedly connected to a subcontractor’s work is discovered after the job is finished. For example, an alleged installation issue may not become apparent until after closing. That does not mean every workmanship claim is covered.

Review the actual endorsement, the designated additional insured parties, and the required length of completed operations protection. A certificate description is not a reliable substitute.

Coordinate Indemnification, Primary Wording, and Waivers

These provisions are often grouped together but have different functions. Indemnification concerns contractual responsibility for specified losses. Primary and noncontributory language addresses the intended relationship between applicable insurance programs. A waiver of subrogation can limit an insurer’s recovery rights following a paid covered loss, when applicable.

North Carolina General Statute § 22B-1 restricts certain construction-contract indemnification arrangements involving another party’s negligence. Have qualified construction counsel review the agreement rather than assuming a broad clause is enforceable.

Workers Compensation Is a Separate Exposure

North Carolina generally requires workers compensation coverage for employers with three or more employees, with exceptions and special rules. Subcontracting arrangements can create obligations that differ from a simple employee-count test. Calling a worker a 1099 contractor does not automatically settle the issue.

North Carolina General Statute § 97-19 addresses potential liability of certain principal and intermediate contractors when work is sublet without obtaining required evidence of workers compensation compliance.

Review the contracting entity, current coverage evidence, workforce arrangement, and lower-tier subcontractors when applicable. Your subcontract may require coverage even when the legal minimum would not independently require it.

Commercial Auto and Umbrella Requirements Should Fit the Trade

Some subcontractors have pickups, trucks, trailers, and regular equipment deliveries. Others have very little vehicle exposure. Require commercial auto liability where the operations and contract call for it, and consider hired and non-owned auto exposure when employees or owners use vehicles in the business.

Similarly, umbrella or excess liability can provide additional limits above qualifying underlying policies. Whether it is necessary depends on project requirements, potential claim severity, and how the excess coverage responds over underlying insurance.

COI and Endorsement Checklist Before a Trade Starts

A useful process is specific enough to catch deficiencies and simple enough to repeat across multiple projects.

When something does not match, ask the subcontractor and its insurance representative to resolve it before mobilization. A missing endorsement is harder to fix once there is a claim.

Build a Process That Keeps Up With Multiple Homes

As a custom homebuilder grows, subcontractor compliance becomes a workflow issue as well as an insurance issue. A centralized record should identify the trade, approved project, scope of work, document receipt date, coverage requirements, endorsements received, expiration dates, unresolved issues, and who is responsible for follow-up.

Recheck documentation when a policy renews, a trade’s scope changes, a lender or owner requires different terms, or a lower-tier subcontractor is introduced. Someone should have authority to stop a deficient subcontractor from starting work.

For builders involved with North Carolina Home Builders Association programs, local Home Builders Associations, or Parade of Homes projects, a disciplined document workflow can help manage the additional coordination that comes with busy project schedules. The insurance requirements themselves should still be based on the actual contracts and work.

Common Mistakes Custom Homebuilders Can Avoid

• Collecting a COI without checking the subcontract. A reported limit is not proof that every contractual requirement is met.
• Assuming a certificate creates additional insured status. Verify applicable endorsements.
• Forgetting completed operations. Think about claims that surface after the home is occupied.
• Using identical requirements for all trades. Match them to the operations and project.
• Missing policy renewals. A document that was current last spring may have expired.
• Starting work with open deficiencies. Establish clear approval rules before mobilization.