Medium Size Dining Room Ideas . Three feet (36 inches) of. Dining room design ideas for a large contemporary open plan dining room in london with white walls, medium hardwood flooring, a standard fireplace, a brick fireplace surround and brown. 50 Mediumsized Dining Room Ideas for 2019 from www.homestratosphere.com This page explores these three situations, explains how to work out dining room size and gives some example layouts for different dining room sizes. This page is part of the dining room. Seven (7) inches of distance from the chair to end of the table on each side of the chair.