How should I design an under-counter washer/dryer cabinet?

The most important aspect of a design for an under-counter washer-dryer cabinet is to ensure that there is enough space for easy operation as well as cleaning of the cabinet. The advantage of an under-counter cabinet is that the top is an option and not a necessity. The cabinet could be just made of frames surrounding the machines and made to merge with the existing counter. Measure out the door frames. You can opt between sliding and conventional doors. Ensure you make arrangements for securing the machines firmly to the wall and create a base that can be moved out for cleaning.