Yes, dumbwaiters are legal in most areas, provided they comply with local building codes and safety regulations. It's important to ensure that any dumbwaiter you install meets current safety standards and has the necessary third-party certifications. Avoid DIY or homemade systems, as these won't pass inspections and can be very dangerous.
Always work with a reputable manufacturer and a professional installer to ensure your dumbwaiter is safe and legal. This way, you can enjoy the convenience it offers without worrying about compliance issues.