average per square foot cost of building a sunroom
1 The above figures place the sunroom addition at $360 per square foot. 2  This pricing structure assumes that carpenters charge an average of $70 per hour, electricians between $65 to $85 per hour, and painters between $20 and $35 per hour. Install bead board ceiling-Average price per bundle (6 boards at 8' lengths) $30. 2  Total cost $240, plus installation time of roughly 12 hours; 3  Moldings-Average of $3.00 per foot of installed molding for a total of roughly $750 to complete framing around all doors, windows, and skylights;