Anybody who has ever bought a sofa knows that the excitement of choosing the style, color, and fabric can be dashed by the not-so-simple task of getting the sofa through the front door.

This dilemma prompted Jeff Frank to launch Simplicity Sofas in 2007, a company that builds high-quality couches that are delivered in parts so easy to assemble that an unaided eight-year-old can build one in less than five minutes.