Cost to Build a 300 Sq Ft Deck
Estimated deck cost for 300 sq ft by material.
A 300 sq ft pressure-treated wood deck costs about $4,500 – $7,500 installed (avg $6,000).
| Material | Estimated cost (installed) |
|---|---|
| Pressure-treated wood | $4,500 – $7,500 |
| Cedar | $6,000 – $12,000 |
| Composite | $9,000 – $18,000 |
| Redwood | $9,000 – $15,000 |
US national-average installed estimates. Height, railings, stairs and footings add to the price. Get local quotes.
Have exact dimensions? Use the full Deck Cost Calculator to enter length, width and depth.
Last reviewed: November 2026
Data sources: Standard volume and area formulas.
Disclaimer: Quantities are estimates from the area you entered; measure your actual space and add a waste allowance. Material and labor costs vary by region.
Frequently Asked Questions
In pressure-treated wood, about $4,500 to $7,500 for pressure-treated wood. Composite costs more up front but lasts longer — see the table.
Composite costs more initially but needs little maintenance and lasts longer, which can make it cheaper over the deck's lifetime.