Serving our clients in 5 core areas

Structural Engineering

Civil Engineering

Repair and Restoration

Construction Support / Inspection and Testing


Cathedral of the Immaculate Conception


Ryan Biggs | Clark Davis offers a complete range of structural restoration services including nondestructive testing, investigations, state-of-the-art masonry restorations, timber rehabilitation, and renovations of historic structures. The firm has provided structural engineering services for:

  • Over one dozen Save America’s Treasures properties
  • Over two dozen National Historic Landmarks
  • Nearly 150 structures listed on the National Register of Historic Places

It is our policy to provide services consistent with the Secretary of the Interior’s “Standards for the Treatment of Historic Properties” for all historical projects whether they are listed as historical landmarks or not.

We have a long history of working cooperatively with and for historical groups and agencies in New York, Connecticut, Vermont, Rhode Island, Massachusetts, New Jersey, Pennsylvania, and Maryland. Much of our work comes by way of referral, especially restoration work. Many of our preservation projects have received funding through grants and have been well received by preservation groups.