The typical cost to build a sunroom ranges from $20,800 to $72,600, while the national average cost is $47,000. The main factors that affect the cost to build a sunroom include the type and size of the sunroom, the cost of labor and permits, and the cost of materials.

The average cost of a new sunroom installation ranges from $20,800 to $72,600, though some converted sunrooms may cost as little as $5,000 to build, while larger, more luxurious sunroom additions could cost as much as $140,000.