\Sunrooms are often unheated rooms primarily made up of windows and designed to let you enjoy the weather without having to be out in it. It can be a great place to keep your outdoor plants safe during extreme weather conditions. They are simple to install because they do not require any additional heating or cooling routing, though you might need an electrician to run wires to power any lights or ceiling fans you choose to install. An unheated sunroom can cost around $15,000, though the price goes up depending on the materials you use. Wood framed sunrooms are less expensive than aluminum ones—those can run upwards of $22,000.

A four-season room is similar to a sunroom but is hooked into the home’s heating and cooling systems. This requires an additional contractor to set up the room’s HVAC. Collectively, these rooms tend to run around $20,000, making them slightly cheaper than a high-end sunroom.