Yes! Most modular sofas are created to be expanded later on. They may sell individual modules that you can purchase at a later date to add to your setup, so make sure to note where you bought the modular sofa from so you can add pieces if you need to. Keep in mind, though, that many companies change their designs regularly, and your particular modular sofa may not be manufactured, so if you really think you want to expand, it may make sense to buy all the pieces at once.