Sunroom Addition cost breakdown
At a mid-range, national-average baseline, a typical sunroom addition project is estimated at $14,400 to $45,000. The table below breaks the cost down so you can see where your project is likely to land.
| Type | Cost per sq ft | Typical total (200 sq ft) |
|---|---|---|
| 3-season room | $60 to $150 /sq ft | About $12,000 to $30,000 |
| 4-season room | $80 to $250 /sq ft | About $16,000 to $50,000 |
| Conservatory | $150 to $350 /sq ft | About $30,000 to $70,000 |
| Solarium | $180 to $400 /sq ft | About $36,000 to $80,000 |
Sunroom Addition cost by project size
Most of your sunroom addition cost scales with size. Here is the estimated national-average range at a few common project sizes.
| Sunroom size (square feet) | Estimated total cost | Scale |
|---|---|---|
| 100 square feet | $7,200 to $22,500 | Smaller project |
| 200 square feet | $14,400 to $45,000 | Typical project |
| 350 square feet | $25,200 to $78,800 | Larger project |
What drives sunroom addition cost
- Size in square feet.
- 3-season versus insulated 4-season construction.
- Amount of glass and frame material.
- Foundation: existing slab or new.
- Heating, cooling, and electrical.
Key cost factors
3-season vs 4-season
A 3-season room is unheated and cheapest, used in mild weather. A 4-season room is insulated and climate-controlled for year-round use, which costs more.
Glass and structure
More glass and premium framing raise the cost. Full glass conservatories and solariums are the most expensive because of the glazing and structure.