According to the Fiber Broadband Association's 2025 report, median costs are $8 per foot for aerial builds and $18 per foot for underground installations. Learn the real cost of underground fiber optic cable installation, including trenching, materials, labor, and infrastructure requirements. This breakdown gives you real numbers to build better estimates. Total Project Costs: For commercial installations, expect costs ranging from $5,000 to $20,000 per mile for underground projects and from $40,000 to $60,000 per. Business owners planning network upgrades often want to know the fiber optic cable installation cost per foot. A fiber optic cable is made up of ultra-thin strands, each capable of carrying huge amounts of data at the speed of light.
[PDF Version]