Builder's Risk Insurance for Tower Contractors
A tower build puts $200,000 to $2M+ in materials on a job site before the tower owner takes possession. Builder's risk insurance covers loss or damage to those materials during construction, protecting the contractor from catastrophic financial exposure on every project.
Builder's risk vs. installation floater
Builder's risk and installation floater are closely related coverages that protect property during construction. Builder's risk typically covers structures being built — the tower itself, equipment shelters, and foundations. An installation floater covers equipment and materials being installed into or onto an existing structure — antennas, coax, RRUs, and other carrier equipment mounted on an existing tower. For tower contractors, the distinction matters because new tower construction needs builder's risk while antenna installation on an existing tower needs an installation floater. Many carriers write a combined policy that covers both scenarios.
What is covered during construction
Builder's risk for tower construction covers the tower structure (steel sections, bolts, guy wires), foundations and grounding systems, equipment shelters and cabinets, antenna systems and mounts, coaxial cable and fiber runs, power and telco feeds, generators and battery backup systems, fencing and compound improvements, and all materials stored on site awaiting installation. Coverage applies from when materials arrive at the site through project completion and acceptance by the tower owner. Materials in transit to the site may also be covered depending on policy terms.
Perils covered and common exclusions
Builder's risk policies are typically written on an all-risk (special form) basis, covering all perils of physical loss unless specifically excluded. Common covered perils include fire, wind, hail, lightning, theft, vandalism, vehicle damage, and collapse during construction. Common exclusions include flood (requires separate coverage), earthquake (available by endorsement), faulty workmanship (the work itself, not resulting damage), normal settling and shrinkage, and wear and tear. Wind and hail deductibles may be percentage-based in coastal or high-wind zones.
Project-specific vs. annual policies
Builder's risk can be purchased on a per-project basis or as an annual policy covering all projects during the policy year. Project-specific policies are appropriate for large, standalone tower builds with defined start and end dates. Annual policies (also called master builder's risk or rolling builder's risk) are more efficient for contractors building multiple towers throughout the year. Annual policies avoid gaps between projects and eliminate the administrative burden of purchasing individual policies for each build. The premium is based on total annual project values.
Determining coverage limits
Builder's risk limits should reflect the completed value of the project — the total cost of materials, equipment, and labor at the point of maximum exposure. For a new tower build, this includes the full value of the tower structure, shelter, antenna systems, cabling, site work, and all installed components. Underinsuring creates a coinsurance problem — if the limit is less than the completed value and a loss occurs, the policy may pay only a proportional share of the claim. Work with your broker to calculate accurate completed values for each project type in your portfolio.
Frequently asked questions
Who buys builder's risk on a tower project — the contractor or tower owner?
This depends on the contract. On new tower builds, the tower owner often purchases builder's risk and includes the contractor as a named insured. On modification and installation projects, the contractor may be responsible for carrying an installation floater. The MSA or contract specifies who bears the insurance obligation. When the tower owner provides builder's risk, verify that the policy covers your materials and work in progress before starting the project.
Does builder's risk cover equipment stored off-site?
Some builder's risk policies include coverage for materials stored at your warehouse or yard that are designated for a specific project. This coverage may be limited to a percentage of the total policy limit (typically 10-25%). Materials in transit between your storage facility and the job site may also be covered. Review your policy for off-site storage and transit provisions to avoid gaps.
What happens when the project is complete?
Builder's risk coverage terminates when the project is completed and accepted by the owner, when the structure is put to its intended use, or at the policy expiration date — whichever comes first. After termination, the structure is covered under the owner's commercial property policy. Delays in project completion can extend beyond the builder's risk policy period, requiring a policy extension endorsement to maintain coverage.
Does builder's risk cover weather delays?
Standard builder's risk covers physical damage from weather events (wind, hail, lightning) but does not cover financial losses from weather-related delays. Delay in completion or soft cost coverage can be added by endorsement to cover additional expenses incurred when weather damage delays project completion, including extended general conditions, additional labor costs, and liquidated damages.
Related coverage types
Coverage by work type
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