The U.S. saw its first modern sofa-in-a-box company, Campaign, launch in 2015 and several competitors, like Floyd, Burrow and Elephant in a Box, have since followed.

Renters rejoice. Ikea furniture now has a wedge dowel that makes it quicker and easier to assemble and take apart — without an Allen key in sight. The news comes as a three-part BBC 2 series ...