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 |
|---|---|---|---|
| Pressure-treated wood | $15/sq ft | $22/sq ft | $28/sq ft |
| Composite (Trex, TimberTech) | $28/sq ft | $38/sq ft | $55/sq ft |
| Azek / PVC decking | $35/sq ft | $48/sq ft | $65/sq ft |
| Hardwood (Ipe, Tigerwood) | $30/sq ft | $45/sq ft | $65/sq ft |
| Built-in seating / pergola | $1,500 | $3,500 | $8,000 |
What Affects the Cost in NJ?
These are the key factors that will determine your actual project cost in Central NJ.
Size & Shape
A simple rectangle is cheapest. Multi-level, angled, or curved decks add 20–40% to labor costs.
Material Choice
Pressure-treated is cheapest upfront but needs staining every 2–3 years. Composite costs more but requires almost no maintenance.
Ground Height
Elevated decks over 30" require more structural support, footings, and stringent NJ code compliance — adding $2,000–$5,000.
Railings & Stairs
Code-required railings run $150–$600 per linear foot for composite or cable rail. Stairs add $800–$2,500 depending on height.
Permits
NJ requires permits for all attached decks. Budget $400–$800 for permits and inspections, included by most reputable contractors.
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