Knight Engineering Services offers foundation evaluations, real-estate inspections and foundation repair work, as well as engineering letters for permitting and completion of repair work and tunnel backfilling. Certified Backfill (Tunnel) letters and other letters are provided within 24 hours upon request. Knight Engineering Services has proudly served the Houston area since 1983. Knight Engineering began as a forensic engineering investigation company, and soon after began operating a soils testing laboratory. This experience led to involvement in foundation related work in the mid 1980's, which included: Analyze foundation for repair needs Develop an appropriate repair plan Inspecting the repair work Multiple ideas and patents have been developed in this field by Knight Engineering who have become specialists in foundation repair.