12x20 Deck Cost
A 12 by 20 foot deck is 240 square feet. In 2026, building one typically costs $5,450 – $17,300 installed, depending mostly on the decking material you choose.
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12x20 deck cost by material
| Material | Estimated installed cost |
|---|---|
| Pressure-treated pine | $5,450 – $13,940 |
| Cedar / redwood | $5,690 – $14,660 |
| Composite (Trex, TimberTech) | $5,930 – $15,860 |
| PVC / capped polymer | $6,650 – $16,100 |
| Exotic hardwood (Ipe) | $7,130 – $17,300 |
Includes decking, framing, labor, railing, a short flight of stairs, and a permit for a ground-level deck. Building it yourself (pressure-treated, materials only) drops to roughly $3,530 – $8,660.
Customize this estimate in the Deck Cost Calculator →
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What goes into the price of a 12x20 deck
- Material — the single biggest swing, from budget pressure-treated to premium composite or hardwood.
- Height — a raised or second-story 12x20 deck costs more than a ground-level one.
- Railing & stairs — included above; removing them lowers the price.
- Labor vs DIY — labor is often close to half the total.
Plan your 12x20 deck
- Deck Cost Calculator — adjust material, height, and features.
- Deck Board Calculator — boards and screws for 240 sq ft.
- Footing & Concrete Calculator — posts and concrete.
Other popular deck sizes
- 10x10 deck cost
- 12x10 deck cost
- 12x12 deck cost
- 12x16 deck cost
- 14x20 deck cost
- 16x16 deck cost
- 16x20 deck cost
- 20x20 deck cost
- 8x12 deck cost