Quick Answer: A custom deck in San Jose costs $18,000-$55,000 for composite decking (Trex, TimberTech, Fiberon) or $12,000-$35,000 for a pressure-treated wood deck, for a typical 400-600 sq ft deck. “Custom” refers to features like: multiple deck levels, built-in seating or benches, pergola or shade structure, built-in lighting, cable railing, outdoor kitchen integration, or a curved deck shape. Each of these custom features adds $3,000-$15,000 to the baseline cost. The deck materials (composite vs. wood) account for 40-50% of the total cost — the structural framing (posts, beams, joists), hardware, and labor are similar for both. Composite decking is more expensive upfront but requires no staining, painting, or sealing — a composite deck in San Jose typically lasts 25-30 years maintenance-free.
Custom Deck Cost by Feature — San Jose 2025
Helpful Resources:
| Feature / Material | Cost (Added to Base Deck) |
|---|---|
| Base composite deck (400 sq ft) | $18,000 – $30,000 |
| Base wood (pressure treated) deck (400 sq ft) | $12,000 – $22,000 |
| Second deck level (multi-level design) | Add $6,000 – $16,000 |
| Pergola or shade structure | Add $8,000 – $25,000 |
| Cable railing (vs. wood railing) | Add $3,000 – $8,000 |
| Built-in bench seating (per linear foot) | Add $200 – $400/LF |
| LED deck lighting (step lights, post caps) | Add $2,500 – $6,000 |
| Outdoor kitchen integration | Add $8,000 – $30,000 |
| Permit (San Jose) | $800 – $2,500 |
Quartz Construction builds custom composite and wood decks throughout San Jose. We design, permit, and build complete outdoor living spaces. Learn about deck services. CSLB #1003436 | Call (650) 749-7436.
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