Sellers Treybal Structural Engineers


Sellers Treybal Structural Engineers (STS) is an experienced consulting engineering firm operating in Vermont and licensed in several states. STS serves both public and private clients and offers service from their main office in Williston, Vermont and part-time office in Middlebury, Vermont.

Greg Sellers and John Treybal founded STS in January 2014 and both bring expertise in a wide range of projects and building methods and materials to STS, including timber framing and structural insulated panel enclosure systems.

We believe that working in a collaborative approach with the other consulting and construction team members leads to a successful project for the client and owner. We offer this approach with the capabilities of a larger firm, while delivering the hands-on principal involvement of a small practice. Our experience, insight, and a willingness to use state of the art ideas allows us to arrive at the appropriate structural systems and solutions for a given project.


Structural Engineering and Consulting Services


277 Blair Park Rd, 220
Williston, VT 05495
United States