Treadwell & Rollo | A Langan Company, is a certified Green Business. We provide environmental, geotechnical, site/civil and earthquake consulting services from our California offices in San Francisco, Oakland, Sacramento, San Jose, and Irvine.
Langan Engineering & Environmental Services, a privately-held consulting firm with 500 employees in 20 offices around the world, recently joined forces with Treadwell & Rollo. The acquisition firmly establishes a nationwide footprint for the company of now nearly 600 employees, with additional offices throughout the United States including New York City; Philadelphia, Pittsburgh, Bethlehem, and Doylestown, PA; New Haven, CT; Trenton, NJ; Arlington, VA; Miami, FL; and Las Vegas, NV.
Our expanded services now include Traffic and Transportation, Surveying and 3D Scanning/BIM, Data Management and Visualization, Landscape Architecture and Planning, Natural Resources and Permitting, and Sustainable Design.
Treadwell & Rollo | A Langan Company, is committed to providing practical and cost-effective solutions for the problems and challenges faced by our clients. To meet that commitment, we are structured to assure the technical involvement of senior professionals on each project. We are proud of our past and confident about our future and we look forward to continuing to help our clients achieve the best results for their projects.