Pole attachment timelines across 17 states averaged 9 to 16 months in 2025, according to Pew Charitable Trusts research on broadband expansion and utility pole processes. That range is the difference between a network lighting customers on schedule and one that misses its BEAD reporting window entirely.
Aerial: The Speed Assumption That Breaks Budgets
Aerial builds look faster on paper. The reality is that make-ready work, the process of preparing existing poles to accept new fiber, is where aerial timelines collapse. Each pole owned by a different utility or telecom carrier requires a separate attachment agreement, a separate inspection, and a separate work order. In dense corridors with shared pole ownership, that process does not run in parallel. It runs sequentially.
Make-ready costs on shared poles can reach 150% of the underlying construction budget when rearrangement or replacement is required [Pew Charitable Trusts, Broadband Expansion and Pole Attachment Timelines, 2025]. ISPs entering their first aerial build rarely price this into their feasibility model.
Underground: The Cost Assumption That Is Often Correct
Underground builds carry higher upfront costs, specifically bore and conduit, but the permitting picture is different. Municipal right-of-way permits for underground work are typically issued at the project level rather than the pole level, which means a single permit covers hundreds of addresses rather than requiring individual approvals per pole.
In geographies with soft soil and limited existing pole congestion, underground is frequently the faster path to construction start. Rocky soil and high water tables reverse that calculus entirely. Soil classification belongs in feasibility modeling, not as a discovery during construction.
What This Changes on Monday Morning
The aerial vs. underground decision should not be resolved in the design phase. It should be resolved in the feasibility phase, informed by specific data: pole ownership by corridor, local make-ready history, soil conditions, and municipal permitting timelines for that specific jurisdiction.
Permit timeline variance is not a project management problem. It is a site selection and service area sequencing problem. Sequences that start with low-contention corridors and build toward complex ones reduce overall program risk regardless of build method.
The ISPs that hit their activation targets are the ones that modeled permitting before they modeled splice charts.