Where:
• SC = Total Sunroom Cost
• A = Area (square feet)
• m = Cost per square foot
• W = Number of windows
• w = Cost per window
• D = Number of doors
• d = Cost per door
• E = Extra features cost
• F = Foundation upgrade cost
2025 Average Costs by Type:
• Three-Season Room: $80-$240 per sq ft ($10,000-$50,000 total)
• Four-Season Room: $250-$450 per sq ft ($25,000-$80,000 total)
• Conservatory: $200-$400 per sq ft ($20,000-$80,000 total)
• Glass Solarium: $300-$500 per sq ft ($30,000-$150,000 total)
• Prefab Kit: $30-$160 per sq ft ($5,000-$30,000 total)
Key Differences:
• Three-Season: Single-pane windows, minimal insulation, no HVAC
• Four-Season: Double/triple-pane windows, full insulation, HVAC integration
• Conservatory: Traditional glass structure with peaked roof
• Solarium: All-glass construction with structural glazing
Additional Costs to Consider:
• Building permits: $500-$3,000
• Foundation/footings: $5,000-$15,000 (if needed)
• Electrical work: $1,500-$5,000
• HVAC extension: $3,000-$8,000 (four-season only)
• Flooring: $3-$15 per sq ft
• Insulation upgrade: $2-$8 per sq ft
ROI & Value:
• Sunrooms typically add 50-80% of their cost to home value
• Three-season rooms offer better ROI than four-season
• Popular sizes: 12×12 (144 sq ft) and 16×20 (320 sq ft)
• Construction timeline: 2-8 weeks depending on complexity
A sunroom is a perfect way to expand your home, bring in more natural light, and create a cozy space for relaxation or entertainment. Whether you’re considering a 3-season sunroom for summer enjoyment or a 4-season sunroom for year-round use, costs can vary greatly.
The Sunroom Cost Calculator helps you estimate your total project expense by factoring in square footage, materials, labor rates, and custom add-ons like HVAC or flooring. This tool gives you a clear idea of what to expect before hiring a contractor or committing to a design.
How the Sunroom Cost Calculator Works
The calculator considers:
- Size (sq ft): Larger sunrooms require more materials and labor.
- Sunroom Type: 3-season (lower cost) vs. 4-season (insulated, higher cost).
- Materials: Standard, premium, or luxury finishes.
- Labor Costs: Based on contractor rates per square foot.
- Extra Features: HVAC, skylights, windows, flooring, roofing, etc.
Formula: Total Cost=(Size (sq ft)×(Material Cost + Labor Cost))+Extra Features\text{Total Cost} = (\text{Size (sq ft)} \times (\text{Material Cost + Labor Cost})) + \text{Extra Features}Total Cost=(Size (sq ft)×(Material Cost + Labor Cost))+Extra Features
Step-by-Step: Using the Calculator
- Select Sunroom Type – Choose between a 3-season or 4-season build.
- Enter Square Footage – Input the size of your planned sunroom.
- Choose Material Quality – Standard, mid-range, or luxury finishes.
- Enter Labor Costs – Based on local contractor pricing.
- Add Extra Features – HVAC, insulation, flooring, skylights, etc.
- Get Estimate – See a cost breakdown instantly.
Example Calculations
Example 1: Small 3-Season Sunroom
- Size: 150 sq ft
- Material Cost: $120/sq ft
- Labor Cost: $40/sq ft
- Extra Features: $2,000
(150×(120+40))+2,000=26,000(150 \times (120+40)) + 2,000 = 26,000(150×(120+40))+2,000=26,000
✅ Estimated Total = $26,000
Example 2: Large 4-Season Sunroom
- Size: 250 sq ft
- Material Cost: $180/sq ft
- Labor Cost: $60/sq ft
- Extra Features: $8,000 (HVAC + premium flooring)
(250×(180+60))+8,000=68,000(250 \times (180+60)) + 8,000 = 68,000(250×(180+60))+8,000=68,000
✅ Estimated Total = $68,000
Benefits of the Calculator
✔ Fast Estimates – No need for manual math.
✔ Budget Planning – Know your range before contacting contractors.
✔ Customizable – Adjust based on design and location.
✔ Decision-Making – Compare 3-season vs. 4-season costs.
✔ Transparency – Avoid surprise expenses.
Cost Breakdown by Sunroom Type
- 3-Season Sunroom: $15,000 – $40,000
- 4-Season Sunroom: $25,000 – $70,000+
- Prefab Sunroom Kits: $8,000 – $30,000
- Luxury Solarium/Glass Room: $50,000 – $100,000+
Tips for Saving on Sunroom Costs
- Build a 3-season sunroom if year-round use isn’t needed.
- Use prefabricated kits instead of custom builds.
- Get at least 3 contractor quotes before starting.
- Install energy-efficient windows to reduce long-term bills.
- Schedule construction in the off-season to save on labor rates.
FAQs – Sunroom Cost Calculator
1. What is the average cost of building a sunroom?
Most sunrooms range between $15,000 and $70,000, depending on size and type.
2. Is a 3-season sunroom cheaper than a 4-season sunroom?
Yes, 3-season sunrooms are cheaper because they don’t require insulation or HVAC.
3. How much does a sunroom add to home value?
A well-built sunroom can add 50–80% of its cost to your home’s resale value.
4. Do I need a permit to build a sunroom?
Yes, in most areas, a building permit is required. Always check local codes.
5. How long does it take to build a sunroom?
Typically 2 to 6 weeks, depending on complexity.
6. Can I finance a sunroom?
Yes, many contractors and banks offer financing plans.
7. Are prefabricated sunrooms worth it?
They are cheaper and quicker to install, but offer fewer customization options.
8. What’s the cost per square foot for a sunroom?
On average, $100–$300 per sq ft, depending on design and features.
9. Do sunrooms need heating and cooling?
Only 4-season sunrooms require HVAC.
10. Can I DIY a sunroom installation?
Small prefab kits may be DIY-friendly, but most large builds require professional installation.
Conclusion
The Sunroom Cost Calculator is a powerful tool for anyone considering adding a sunroom. By inputting size, materials, labor, and features, you can get an accurate budget estimate before starting construction.
Whether you want a simple 3-season retreat or a luxurious 4-season sunroom, this calculator helps you plan smarter, avoid hidden costs, and make informed decisions.