September 8, 2025 – Columbus, GA – McMillan Pazdan Smith, a regional architecture and advisory firm, welcomes Hecht Burdeshaw Architects, a 60‑year‑old Columbus, Georgia‑based architecture firm, into its Southeast expansion. The merger boosts McMillan Pazdan Smith’s presence in Columbus and the Auburn‑Opelika region, adds 19 team members, and strengthens capacity for public, commercial, education, healthcare, and civic projects through enhanced local leadership and resources.

September 3, 2025 – Toronto, ON – SLR Consulting (Canada) Ltd., a sustainability and environmental consultancy, has welcomed Powerhaus Consulting, a Toronto‑based engineering and design firm specializing in renewable energy (including utility‑scale solar, battery energy storage systems, EV infrastructure, and overhead distribution), into its global network. This move strengthens SLR’s clean energy capabilities and grid infrastructure reach, and positions the combined organization to accelerate growth in high‑potential markets such as solar, storage, electricity transmission, EV charging, and sustainable infrastructure.

September 3, 2025 – Orlando, FL – Qualus Corporation, a leading pure‑play power solutions firm, acquires dk Engineering, a multidisciplinary engineering and consulting company based in Walnut Creek, California. dk provides advisory, planning, engineering, geospatial services, modeling, feasibility studies, and construction management, primarily for utilities and renewable and energy‑storage developers in the western U.S. The acquisition expands Qualus’ capabilities across the full project lifecycle in power infrastructure, including grid modernization, resiliency, security, and sustainability, and furthers its reach into engineering and consulting services in key Western markets.

September 2, 2025 – Nashville, TN – Ardurra Group, Inc., a national engineering and design firm, acquires J.R. Wauford & Company Consulting Engineers, Inc., a Nashville‑based water and wastewater engineering firm with nearly 70 years of service to municipalities in Tennessee and Kentucky. Founded in 1956, J.R. Wauford provides planning, consulting, design, and construction services for all phases of water and wastewater systems, operating from offices in Nashville, Jackson, and Maryville, Tennessee. The acquisition brings 35 new professionals into Ardurra, expanding technical capacity and regional presence in high-end water infrastructure across the region.

September 2, 2025 – Norwood, MA – GZA GeoEnvironmental Inc., a multi‑disciplinary firm providing geotechnical, environmental, ecological, water, and construction management services, acquires the assets of Siefert Associates, LLC, a national construction engineering firm with offices in Connecticut, New York, and New Jersey. The employees of Siefert Associates join GZA. The acquisition strengthens GZA’s Contractor Services practice, bringing enhanced expertise in large‑scale infrastructure projects and means‑and‑methods engineering across the Northeast and beyond.

For a full list of PSMJ’s transactions please click here.