Choosing the right contract structure is one of the most consequential decisions a builder or contractor makes before breaking ground.
Most discussions about the difference between fixed-price and cost-plus contracts focus on cash flow, profit margins, and client relationships, but fewer address the piece that can make or break a project if something goes wrong: how your contract type directly shapes the way your builders insurance responds to a claim.
This guide breaks down the core differences between these two contract models, how each one affects your builders risk coverage and liability exposure, what insurers need from you at the outset, and where coverage disputes most commonly arise.
What distinguishes fixed-price contracts from cost-plus contracts?
A fixed-price contract sets the project’s total cost at the outset. A cost-plus contract calculates expenses, but the final price is only established once the project is finished.
Fixed-price contracts impose greater risk on the contractor, as they are responsible for any unforeseen expenses. Cost-plus contracts transfer the financial risk to the project owner, who is responsible for all actual expenses along with an extra fee.
Fixed price contracts tend to work well when a project’s scope is well-defined. Cost-plus arrangements suit larger or more complex builds where the full scope of work is harder to pin down from the start.
How Contract Type Affects Builders Insurance Coverage
Fixed Price Contracts and Policy Valuation
Under a fixed-price contract, the total project value is spelled out in the agreement, giving an insurer a clear baseline for setting coverage limits. That said, builders still need to proceed carefully.
A builders risk policy should encompass the original contract amount, along with the value of any modifications and change orders made afterward, as well as the costs of materials provided or installed by third parties, reflecting the total project value.
Change orders are common even on fixed-price jobs. If the policy limit doesn’t keep pace with those changes, a builder can find themselves underinsured when they need coverage most.
Cost-Plus Contracts and Moving Targets
Cost-plus contracts present a more complicated picture for builders’ insurance. Because costs accumulate over time and the final project value isn’t fixed, the insurable value of the project shifts throughout construction.
Under a reporting form policy, the insurer requires regular updates on the property’s actual value at risk, typically monthly. Failing to report on time may lead to penalties, and any gap between the report’s due date and the actual submission time is likely to result in inadequate insurance coverage.
This is one of the more significant risks in the fixed-price versus cost-plus builders insurance conversation. Builders working under cost-plus arrangements must stay on top of their reporting obligations or risk gaps in coverage when a claim arises.
Policy Valuation: Understanding Insurers’ Expectations
Builders risk insurance can be offered based on either a completed value or a reporting form approach. Regardless of the option chosen, the estimated completed value of the project serves as the insurance limit.
When a loss settlement is issued and the coverage limits fall below 100% of the total completed value of the insured structure, the insurer will apply a penalty, resulting in only a portion of the loss being compensated.
One frequent trouble spot arises when builders sometimes leave out soft costs. Architect’s fees, engineering costs, and other indirect expenses can represent a meaningful portion of total project value and should be factored into the coverage limit.
The Oregon Department of Administrative Services guidance notes that soft costs, including additional interest on borrowed funds, architects’ and engineers’ fees, and insurance premiums for the extended reconstruction period, may be covered by endorsement and are worth reviewing with your agent.
Liability Exposure by Contract Type
Fixed price contracts place the financial burden of unexpected costs on the contractor. That pressure can affect quality decisions, and if a defect results in damage or injury, general liability exposure can follow.
It’s important to highlight that builders risk coverage pertains to any physical loss or damage sustained by the project itself. Many builders risk policies exclude liability coverage, which is why contractors should seek protection through general liability policies.
Under cost-plus arrangements, the project owner assumes most or all of the risk of cost overruns. However, contractors are not without exposure.
Disputes over documented costs and billing transparency are common and can evolve into claims or litigation. Builders working under cost-plus contract insurance coverage arrangements should make sure their professional and general liability policies are current and properly scoped.
What Builders Must Disclose to Their Insurer
Clear disclosure to your insurance provider is essential, regardless of contract structure. Insurers need accurate information to set appropriate limits and issue a policy that will respond when something goes wrong. Builders should share:
- A copy of the construction contract so the insurer can assess project value and risk
- The anticipated total completed value, including labor, materials, and overhead
- A schedule of known change orders or expected scope changes
- Reporting obligations under a cost-plus arrangement, so the right policy form is selected
- Information about subcontractors and suppliers who may have an insurable interest
The premiums for builders risk policies are determined by the total cost of the completed project, and these policies are issued with the stipulation that any changes in project costs must be communicated to the insurance company.
This is particularly true of cost-plus contracts, where project costs can escalate well beyond the original estimate.
Talk to Burton & Company Before You Sign
The contract you sign and the policy you carry need to work together. At Burton & Company, we’ve been helping Virginia builders and contractors get that alignment right for more than 100 years. Whether you’re working under a fixed-price agreement or managing a cost-plus build, our team can help you assess your coverage needs, identify gaps, and make sure your builder’s insurance is structured to respond as you expect.
Don’t wait for a claim to arise to discover that your coverage doesn’t meet the requirements of your contract. Reach out to Burton & Company online or call (888) 652-1046 for a straightforward conversation about builders insurance that fits the way you actually work.
