When procuring shop design services, you must prioritize CAD/3D Rendering capabilities to visualize the space before production. Ensure the provider offers detailed floor plans, elevation drawings, and electrical layouts. For physical fixtures, specify materials such as E1 grade MDF, tempered glass (BS EN 12150-1 standard), and high-output LED lighting (CRI >80) to ensure durability and visual appeal. If the design includes custom shelving, verify load-bearing capacities (typically ≥50kg per shelf) to prevent structural failure.