A bench between 42 and 52 inches in length will seat two adults comfortably. A booth-style table with a 48-inch bench on each side will fit a family of three children and two adults. On average, benches have a height of 18 inches and a depth of approximately 17 1/2 inches. Depth should not exceed 20 inches for comfort.Click to see full answer. Subsequently, one may also ask, how deep should the seat of a bench be? 15-20 inches what is a good height for a bench? Height: Standard bench height for decks and outdoor benches is typically between 18″ and 20″. Keep in mind that is assuming the table you’re building the benches for hovers around 29-30 inches, the standard height for tables. Likewise, people ask, how much should a table overlap a bench? The depth of the benches should be at least 24 inches, because you will want to leave space for an angled back or upholstered seating. The table should overlap each bench by three inches or so.What is a good size for a shower bench?Your custom shower seat or bench should not infringe upon the shower floor space allotted to your shower. In addition to floor space, the National Kitchen & Bath Association reveals that a shower seat height of 17” to 19”, and a depth of 15” is the standard size.