The short version
Pressure-treated wood costs less to install but requires ongoing maintenance (sanding, staining, sealing every 1-2 years) and typically needs full replacement every 10-15 years in Florida's sun and saltwater exposure. Composite decking costs roughly 2-3x more upfront but eliminates routine maintenance and commonly lasts 25+ years, often backed by long manufacturer warranties.
Cost comparison
- Pressure-treated wood: roughly $8-$18 per square foot installed
- Tropical hardwood (e.g., ipe): roughly $20-$30 per square foot installed
- Composite decking: roughly $18-$35+ per square foot installed
Where wood still wins
If you're on a tighter budget, planning to sell in the next few years, or simply prefer the traditional look and feel of real wood underfoot, pressure-treated lumber remains a reasonable choice — as long as you're realistic about the maintenance commitment.
Where composite wins
For owners planning to stay long-term, composite's near-zero maintenance and resistance to splintering, graying, and rot make the higher upfront cost pay for itself over a 15-20 year horizon — especially for barefoot-friendly family docks.
A note on heat
Not all composite is created equal in direct Florida sun — lighter colors and capped composite boards stay noticeably cooler underfoot than dark, uncapped early-generation composite products. Ask to see samples in direct sunlight before choosing a color.