ECS Limited

ECS Limited is an engineering consulting firm working in four practice areas: geotechnical engineering, construction materials, environmental consulting, and building science and infrastructure. Its clients are developers, contractors, and property owners who need subsurface information before they build and testing and inspection while they build.

Geotechnical work covers due diligence and planning, subsurface exploration, geotechnical lab testing, geostructural and retaining wall design, earth retention systems, instrumentation and monitoring, and natural disaster evaluations. Construction materials services include soil lime and cement mix design, third-party code compliance, tilt-up construction observation, and non-destructive testing such as rebound hammer, Windsor probe, magnetic particle, and liquid dye penetrant testing.

Environmental work runs from due diligence and brownfields redevelopment through soil and groundwater assessments, vapor intrusion evaluation and mitigation, PFAS assessment and monitoring, storage tanks, remedial investigations and feasibility studies, NEPA and state environmental policy reviews, wetland assessment and permitting, and indoor air quality and HUD risk assessments. Building science covers property and facility condition assessments, building enclosure commissioning and design, roofing design and assessments, accessibility compliance surveys, parking structure assessments, structural forensics, Florida milestone inspections, third-party plan review, and building code inspection programs.

ECS was founded in 1988 and is employee-owned, with more than 3,200 employees in over 125 offices and testing facilities across the country. It reports being ranked #60 on Engineering News-Record's Top 500 Design Firms (April 2026), #148 on ENR's Top 200 Environmental Firms (October 2025), and #38 on the Zweig Group Hot Firm List (June 2026). Fee schedules and office-level contacts are not published, so confirm which ECS office covers your market and which services it performs in your state.