Trillium Advisory Group is a specialized advisory firm based in Calgary, Alberta, focused on enhancing the design, construction, and operation of facilities in the construction industry. Founded in 2018 and acquired by Zachry Group in 2021, Trillium has established itself as a leader in construction advisory services.

The company offers a variety of services aimed at improving project delivery and operational outcomes. Key areas include the deployment of best practices like Advanced Work Packaging and Lean Construction, process optimization for increased efficiency, and support for digital transformation through tools such as data analytics and digital twinning. Trillium serves a diverse clientele across sectors including commercial, energy, infrastructure, and heavy industrial, providing both short-term consulting and long-term embedded roles within client teams. The firm is also active in industry communities, contributing to advancements in construction practices and standards.