2026 BNi Square Foot Costbook

The 2026 BNi Square Foot Costbook provides reliable and practical construction cost data available, based entirely on actual completed projects. Organized by building type, each case study includes detailed CSI cost breakdowns, square foot costs, and insightful project narratives. This edition also features hundreds of updated unit-in-place costs, labor and material rates, assemblies data, and regional modifiers to ensure accurate, location-adjusted estimating. Whether you’re developing early-stage budgets or refining line-item estimates, this costbook remains a trusted resource across the AEC industry.