Modular furniture is a lifesaver no matter if you live in a one-bedroom (that’s really a studio with wobbly plywood pretending to be a wall) or a sprawling estate with a pool house. Think of it as Build-A-Bear for furniture like sofas, bookshelves, and even bed frames. As someone who’s had to carry (and pivot) a traditional couch up four flights of cramped stairs and sell a too-big bed frame that wouldn’t fit into her next space, modular.