Sunroom Addition Cost
Sunroom additions cost $8,000–$80,000+ depending on size, materials, and whether you choose a three-season or four-season design.
Cost by Sunroom Type
Three-Season Sunroom
$8K – $25K
No HVAC, single-pane glass, used spring through fall.
Four-Season Sunroom
$25K – $80K+
HVAC, insulated glass, usable year-round.
Frequently Asked Questions
How much does a sunroom addition cost?
A three-season sunroom averages $8,000–$25,000. A four-season sunroom with insulation, HVAC, and foundation runs $25,000–$80,000+.
Is a sunroom a good investment?
Sunrooms typically return 50–70% of their cost at resale. They add living space without the expense of a full room addition.
How long does it take to build a sunroom?
A prefab sunroom kit can be installed in 2–4 weeks. Custom-built sunrooms take 6–12 weeks including foundation, framing, and finishing.