Our Companies

Schnabel Engineering DC, Inc. (SEDC), a wholly-owned subsidiary of Schnabel Engineering, is a District of Columbia Certified Business Enterprise (CBE #L61061042023). Located in the heart of Tenleytown in Washington, D.C., the company provides geotechnical and geostructural design and construction phase services. SEDC’s staff has more than 30 years of experience working in the District, Maryland and Virginia on a broad range of building types, as well as transportation and water/wastewater infrastructure projects, for government, institutional, educational, commercial and industrial clients.

Lachel & Associates (Lachel) specializes in design and construction management services for tunneling and other heavy civil construction projects in the areas of transportation, water and wastewater infrastructure, and hydroelectric power. Our goal is to meet the needs of clients by providing fully integrated management and technical services that are objective, thorough, and effective.

Deere & Ault (D&A) specializes in civil engineering with a focus on water resources, geotechnical, dam, slurry wall, tunnel, and mine reclamation projects. D&A is supported by skillful and dedicated personnel with over 30 years of experience. Our objective is to fully integrate management, staff, and services to effectively meet the needs of clients and partners.