Sunroom Cost Calculator
Three-season or four-season sunroom build cost.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Estimated total
- $37,100.00
- Room size
- 192 sq ft
- Structure & glazing
- $28,800.00
- Foundation
- $4,800.00
- Heating & cooling
- $3,500.00
- Cost per sq ft
- $193.23
Quick answer
Sunrooms cost roughly $80–200 per square foot: three-season kits at the low end and insulated four-season rooms with HVAC at the top.
cost = area × rate + foundation + HVAC
At a glance
| What it does | Three-season or four-season sunroom build cost. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Length, Width, Sunroom type, Foundation, HVAC add-on |
| Main output | Estimated total |
| Formula | cost = area × rate + foundation + HVAC |
| Cost | Free — no sign-up, no download |
How to use the Sunroom Cost Calculator
- 1Enter the planned room footprint.
- 2Choose the sunroom type — screened through to full conservatory.
- 3Pick the foundation and add HVAC for year-round use.
Inputs explained
- Length(ft)
- Enter the length you are working with.
- Width(ft)
- Enter the width you are working with.
- Sunroom type
- Choose one of: Screened porch, Three-season, Four-season insulated, Conservatory / custom.
- Foundation
- Choose one of: Existing deck or slab, New concrete slab, Crawl space / footings.
- HVAC add-on($)
- Enter the hvac add-on you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Length16 ft
- Width12 ft
- Sunroom typeFour-season insulated
- FoundationNew concrete slab
- HVAC add-on3500 $
Results
- Estimated total$37,100.00
- Room size192 sq ft
- Structure & glazing$28,800.00
- Foundation$4,800.00
- Heating & cooling$3,500.00
- Cost per sq ft$193.23
Frequently asked questions
How much does a 12x16 sunroom cost?
About $25,000–35,000 for a four-season insulated room on a new slab, or $15,000 for a three-season build.
Does a sunroom add home value?
A four-season room typically returns 45–60% of its cost at resale and much more in usable living space.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.