The BNi DATA Interiors Square Foot 2026 Costbook 2026 Edition CSI Master Format is a comprehensive workbook designed for mechanics and those in the construction industry. Published by Publications, this cost book provides detailed information and data for interior design projects in a CSI Master Format. With a publication year of 2026, this practical guide offers valuable insights and calculations to assist in estimating and budgeting projects accurately. Ideal for professionals and students alike, this costbook is a reliable resource for navigating complex interior design projects.