A sectional sofa is the biggest sofa on the market. It's shaped like an "L," making it ideal to put in the corner of your living room where it can hug your walls, although some people place them in the center of the room. These sofas usually total five or six seat cushions and can have sections that range from 9 to 14 feet long.
A love seat is the smallest type of sofa. These can accommodate two average-size adults comfortably and are usually sold as a smaller complement to a full-size sofa. They're used with sectionals and are also often paired with a sofa. Love seats range from 5 to 6 feet in length on average, although the depth can vary. A love seat's depth will usually match that of an accompanying regular-size sofa.
The most popular piece of living room furniture is the main sofa. An average-size sofa is traditionally designed to seat three people. The average length of a traditional sofa is 6 to 8 feet. Just like love seats, they come in various depths. The depth of a traditional sofa typically ranges from 34 to 40 inches.
Besides the length and depth of the sofa frame itself, cushion size and depth also affect the overall size of the piece of furniture. The types of arms and design of the sofa frame can add several inches to the overall length of the couch, as well. Measure your living room space and take those measurements with you whenever you go shopping for furniture. Bring a measuring tape as well to size up a potential purchase.