Since 1910, LLI Engineering has been consistently recognized for providing top-quality engineering design with rock-solid integrity.

LLI has an exceptional track record of completing more than 10,000 major projects, representing over $3.5 billion in construction spending. Excellent reviews and an extensive list of repeat clients confirm LLI’s long history of providing straightforward communication, meticulous contract management, completing jobs on schedule, insuring cost effectiveness, and providing clients with plans and construction coordination requiring minimal revisions.

Located in Pittsburgh, Pennsylvania, LLI Engineering specializes in commercial, critical facilities, infrastructure upgrades, Green building design, energy conservation modifications, project engineering, and engineering estimates. LLI provides electrical, mechanical, piping, and structural engineering services.