Sustainable Investment Group (SIG), a Company of TÜV SÜD

Sustainable Investment Group (SIG) is a leading U.S.-based sustainability, engineering, and ESG consulting firm that helps property owners and managers improve building performance, achieve industry-recognized green building certifications, and meet evolving regulatory and investor expectations. SIG provides full‑service support for LEED, WELL, Fitwel, BREEAM, ENERGY STAR, and other certification frameworks, along with ESG strategy, data assurance, energy audits, commissioning, climate finance advising, and healthy building solutions. Their multidisciplinary team of accredited sustainability experts, engineers, and real estate specialists collectively manages over 300 projects annually, supports more than 75 million square feet of green building services each year, and contributes to $34 billion in real estate asset value.

Founded in 2008, SIG has grown into a nationally recognized provider in the green building industry and, as of 2024, is part of the TÜV SÜD America family—an international leader in testing, inspection, and certification services. This partnership expanded SIG’s resources, reach, and ability to deliver comprehensive sustainability services across the full lifecycle of new and existing buildings. With a history of certifying 500+ LEED projects across more than 80 million square feet and performing extensive energy studies, SIG continues to advance environmental performance and operational excellence for properties across the U.S.