What is the average size of a double wall oven?

A double-wall oven takes up slightly more than twice the space required for a single-wall oven. Standard widths for single-wall ovens are 24, 27 and 30 inches, but these standards can vary by up to an inch from brand to brand.

Most wall ovens have less interior usable space than a conventional oven, averaging 3.5 cubic feet to the conventional oven average of 5 cubic feet. This means that while a double-wall oven has more useful space than a single-wall oven, it is not comparable to having two conventional ovens. However, a total usable interior space of 4 cubic feet is sufficient for most four-person households.