Sunroom Cost Calculator
Estimated Sunroom Cost
$30,000 – $60,000
$150 – $300 per sq ft (all-in)
Structure
$30,000 – $60,000
Foundation
Included
Features
None
Size
200 sq ft
Tip: A 4-season sunroom adds livable space year-round and typically recoups 50–70% of its cost at resale. A 3-season room costs much less but can only be used in mild weather.
Disclaimer: Estimates are for budgeting purposes only. Actual costs vary by location, contractor, material availability, and project complexity. Always get professional quotes for exact pricing.
Sunroom Cost Breakdown
| Sunroom Type | Cost per Sq Ft | 150 Sq Ft | 250 Sq Ft |
|---|---|---|---|
| 3-Season | $80 – $160 | $12,000 – $24,000 | $20,000 – $40,000 |
| 4-Season | $150 – $300 | $22,500 – $45,000 | $37,500 – $75,000 |
| Solarium | $250 – $500 | $37,500 – $75,000 | $62,500 – $125,000 |
* Structure cost only. Foundation, HVAC, electrical, and flooring are additional.
How We Calculate
Our sunroom cost calculator estimates total project cost based on room size, sunroom type, foundation requirements, and add-on features.
How the math works: Total cost = (sq ft × per sq ft rate by type) + foundation cost + feature costs. Costs vary widely based on construction quality, glass type, and local labor rates.
Sunroom Types
3-season ($80–$160/sq ft) uses single-pane glass or screens. 4-season ($150–$300/sq ft) has insulated walls, dual-pane windows, and year-round climate control. Solarium ($250–$500/sq ft) features all-glass construction for maximum light.
Foundation Options
Building on an existing patio saves $2,000–$8,000 in foundation costs. A new concrete slab costs $2,000–$5,000 extra. A raised/pier foundation costs $3,000–$8,000 extra but is necessary for elevated homes or uneven terrain.
Common Add-ons
HVAC extension ($2,000–$6,000), electrical work ($800–$2,500), and flooring upgrades ($1,000–$4,000) are common but not always included in base sunroom pricing. Mini-split systems are popular for sunrooms since they don't require ductwork.
Data Sources
Pricing data is compiled from HomeAdvisor, Angi, HomeGuide, and sunroom contractors across multiple US regions (2025–2026). Custom-built sunrooms vary significantly based on design, materials, and local labor costs.
Last updated: 2026-02-08
Frequently Asked Questions
How much does a sunroom cost? +
A sunroom costs $16,000–$75,000+ depending on type and size. A 200 sq ft 3-season sunroom costs $16,000–$32,000. A 4-season insulated sunroom costs $30,000–$60,000. A premium glass solarium costs $50,000–$100,000+. Foundation, HVAC, and electrical are additional.
What is the difference between a 3-season and 4-season sunroom? +
A 3-season sunroom has single-pane glass or screens with minimal insulation ($80–$160/sq ft). It's comfortable in spring, summer, and fall but not heated/cooled. A 4-season sunroom has insulated walls, dual-pane windows, and HVAC ($150–$300/sq ft), making it usable year-round as true living space.
Does a sunroom add value to a home? +
A well-built 4-season sunroom typically recoups 50–70% of its cost at resale. A 3-season room returns 40–50%. The ROI is highest in areas with mild climates and where the sunroom is consistent with the home's style and quality.
Do I need a permit to build a sunroom? +
Yes, most municipalities require building permits for sunroom additions. Permits cost $500–$3,000 and ensure compliance with building codes for structural integrity, electrical, HVAC, and energy efficiency. Expect the permitting process to take 2–6 weeks.
Can I build a sunroom on my existing patio? +
Yes, building on an existing concrete patio eliminates the $2,000–$8,000 foundation cost. The patio must be level, structurally sound, and at the correct height relative to the house. A contractor can assess your patio's suitability.
How long does it take to build a sunroom? +
A prefabricated 3-season sunroom can be installed in 1–2 weeks. A custom 4-season sunroom takes 4–8 weeks. A solarium or complex addition can take 8–12+ weeks. Weather delays and permitting can extend timelines.
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