Deck Building Cost (2026)
By the Home Repair One data team · Updated July 2026 · Ranges from our estimator engine
Short answer: In 2026, a new deck typically runs $4,000–$12,000, set mainly by size and material. Pressure-treated wood is the budget option; cedar costs more; composite (like Trex) costs the most up front but needs almost no maintenance and often wins on total cost over 15+ years. Railings, stairs, height off the ground, footings, and built-in features add to the base. Anything attached to the house or above a certain height usually needs a permit, which ensures proper footings and ledger attachment, the two most common failure points in a poorly built deck.
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Deck cost by size
Decks are priced roughly per square foot of deck surface. Here are 2026 national ranges by deck size at standard material, computed from our cost model. Run the estimator for a range tuned to your ZIP.
| Scope | Typical range |
|---|---|
| Small deck (~150 sq ft) | $4,300–$6,500 |
| Average deck (~300 sq ft) | $8,500–$12,750 |
| Large deck (~450 sq ft) | $13,000–$19,250 |
Wood vs. composite
Pressure-treated wood is cheapest to build but needs sealing every year or two and eventually rots at the posts. Composite costs more up front but resists rot and fading and rarely needs more than a wash. Over the life of the deck, composite often costs less once you count maintenance and replacement.
| Material / finish | Typical range |
|---|---|
| Standard material | $8,500–$12,750 |
| Premium material | $12,500–$18,500 |
What adds to the base
Railings and stairs, height off the ground (which drives footing depth and structure), built-in benches or lighting, and difficult soil for post holes all add cost. A ground-level platform is far cheaper than an elevated deck with a long stair run.
What changes your price
- Deck size in square feet and height off the ground.
- Material, pressure-treated wood, cedar, or composite.
- Railings, stairs, footings, and built-in features.
- Permits and structural requirements for elevated decks.
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FAQ
How much does a deck cost?
A new deck typically runs $4,000–$12,000 by size and material. Pressure-treated is the budget option; composite costs more up front but needs little upkeep. Our estimator ranges it by size.
Is composite decking worth it?
Composite costs more to build but resists rot and fading and needs only a wash, so over 15+ years it often wins on total cost versus wood that needs regular sealing.
Do I need a permit for a deck?
Usually yes for anything attached to the house or above a certain height, a permit ensures proper footings and ledger attachment, the two most common failure points. A licensed builder pulls it.