Deck Sizes Explained
The minimum deck that comfortably seats four people at a table with room to walk around is 12×12. Anything smaller is a landing. Below are the deck dimensions we cover, each with structural specs (joist spacing, beam count, footing count), material cost comparisons between pressure-treated, composite, and hardwood, and full materials lists.
Click any size for structural details, material options, and cost breakdowns.
All Deck Sizes (3)
| # | Size | Sq Ft | Cost Range | Searches/mo |
|---|---|---|---|---|
| 1 | 16×20 Deck | 320 | $4,800–$12,800 to build | 900 |
| 2 | 8×10 Deck | 80 | $800–$2,400 to build | 600 |
| 3 | 12×20 Deck | 240 | $3,200–$8,400 to build | 500 |