Simpson Unlimited, established in 1992, is a full-service firm that specializes in the areas of commercial exterior restoration. The firm offers concrete, stone and window replacement services. It provides waterproofing, roofing, cleaning, power washing and painting services. Simpson Unlimited employs a staff of more than 120 people. The firm offers sealant application and repair services. It provides epoxy injection, patching, sealing and reconstruction services. The firm offers services for Jones Lang LaSalle, Legum & Norman, Prentiss Properties and Lerner Corporation. It provides sheet metal fabrication and installation services. The firm is a member of the National Roofing Contractors Association and the Washington Area Roofing Contractors Association. Simpson Unlimited additionally offers routine maintenance services.