Yes, some reclining sofas require assembly, but this is not the case for all the models present in the market. Some recliners are delivered to you in parts that have to be set up while others are brought when ready for use. For those that need installation, the manufacturer provides a manual with detailed instructions on how to go about it. For some producers of reclining seats, the instructions are availed in a downloadable version on their official website. You need to research about the brand you are interested in to know if you will have to assemble it or not.