Our Company Overview

Treadwell & Rollo | A Langan Company, is a certified Bay Area Green Business, providing environmental, geotechnical, site/civil and earthquake engineering services from our California offices in San Francisco, Oakland, Sacramento, and San Jose. As a member of Langan Engineering & Environmental Services, a privately held consulting firm headquartered in Elmwood Park, New Jersey, Treadwell & Rollo has access to 600 employees in additional offices located in New York City; Philadelphia, Pittsburgh, Bethlehem, and Doylestown, PA; New Haven, CT; Trenton, NJ; Arlington, VA; Miami, FL; Las Vegas, NV; and Irvine, CA.

Our services also 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 provides practical and cost-effective solutions for the problems and challenges faced by our clients. 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.