BOB'S A1 RETAINING WALLS based in Missouri and cover all areas. BOB'S A1 RETAINING WALLS has been working throughout the Missouri state for many years and has many years of experience working in Architectural & Engineering Services. BOB'S A1 RETAINING WALLS offer a full Architectural & Engineering Services. The Staff have expert Architectural & Engineering Services skills, which enable them to carry out minor to major Architectural & Engineering Services projects. Formed in 1993 , BOB'S A1 RETAINING WALLS specializes in Architectural & Engineering Services.