Home and business fiber optics projects typically range from a few hundred to several thousand dollars, depending on run length, fiber type, and labor needs. The main cost drivers are materials, installation time, and environmental factors that affect trenching, conduit, and terminations. 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. The cost of fiber optics installation varies widely based on project scope and site conditions.