2025 Cost Breakdown by Type
Prices reflect installed costs from licensed NJ contractors in Middlesex, Monmouth, and Ocean County. Material costs and contractor availability affect final pricing.
| Service / Item | Low | Avg (NJ) | High |
|---|---|---|---|
| 3-season screened room | $12,000 | $20,000 | $30,000 |
| 3-season glass room | $18,000 | $28,000 | $40,000 |
| 4-season room (insulated) | $28,000 | $40,000 | $60,000 |
| Prefab sunroom (DIY kit) | $8,000 | $15,000 | $25,000 |
| Foundation / deck base | $4,000 | $8,000 | $15,000 |
What Affects the Cost in NJ?
These are the key factors that will determine your actual project cost in Central NJ.
Size
Most NJ sunrooms are 150–300 sq ft. Per-foot costs decrease for larger rooms. The foundation and framing represent fixed costs that get amortized over more square footage.
3-Season vs. 4-Season
A 3-season room has no insulation or HVAC and is usable spring through fall. A 4-season room is a true living space usable year-round and adds significantly more home value.
Glass Quality
Standard dual-pane glass is adequate for 3-season. For 4-season rooms, Low-E triple-pane glass is recommended for NJ winters — add $3,000–$8,000 for premium glass packages.
HVAC Extension
Extending existing HVAC to a 4-season room costs $2,500–$6,000. Mini-split systems are a popular alternative at $2,500–$4,500 installed.
Permits & Setbacks
Sunrooms are permanent additions and require full building permits in NJ. Setback requirements (distance from property line) must be met. Budget $800–$2,000 for permits and inspections.
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