If you are pricing out a year-round sunroom, the first number you want to know is simple: four season sunroom kits cost between $15,000 and $55,000 for a typical 12-by-15-foot build, with most homeowners landing around $30,000 to $40,000 installed. On a per-square-foot basis, expect to pay $120 to $300 installed or $50 to $100…
The sunroom cost per square foot you will pay depends almost entirely on what kind of room you are building. For a standard prefabricated or three-season sunroom, expect to pay roughly $120 to $300 per square foot for a turnkey project. A four-season room with real HVAC, structural glass, and a conditioned foundation lands higher,…
The average sunroom cost to build lands between $20,000 and $70,000 in 2025, with most homeowners spending roughly $35,000 for a standard 12-by-12-foot three-season room. That’s a wide range because a sunroom is not one product — it can be a simple prefab kit screwed onto an existing deck or a fully insulated, climate-controlled four-season…
