DeckMath
Programmatic · 20 sizes

Deck Cost by Size

20 popular deck sizes from 8×10 (80 sqft) to 30×30 (900 sqft) — each page has the deck-cost calculator pre-loaded with those dimensions plus a tier comparison ladder. Pricing reflects 2026-Q1 retail.

10×8
80 sqft
An 8×10 deck (80 sqft) is the smallest practical deck size — barely fits a 4-person bistro set.
10×10
100 sqft
A 10×10 deck (100 sqft) is the typical entry-level deck — good for a 4-seat dining set with grill space.
12×10
120 sqft
A 10×12 deck (120 sqft) is the median small-deck size in the US — the most-permitted deck size for first-time builders.
12×12
144 sqft
A 12×12 deck (144 sqft) gives you 6-person dining capacity with grill clearance.
14×12
168 sqft
A 12×14 deck (168 sqft) splits the difference between 12×12 and 12×16 — common for narrow yards.
16×12
192 sqft
A 12×16 deck (192 sqft) is among the most-searched deck sizes — fits a sectional + grill with room to walk around.
16×14
224 sqft
A 14×16 deck (224 sqft) gives you a generous L-or-U-shaped seating arrangement plus dining for 6.
20×12
240 sqft
A 12×20 deck (240 sqft) is a long, narrow deck — common for ranch-style homes with a long back wall.
16×16
256 sqft
A 16×16 square deck (256 sqft) is a popular 'big enough for a party' build — clean square geometry minimizes complexity.
20×14
280 sqft
A 14×20 deck (280 sqft) accommodates dining + lounge zones — popular mid-size build.
24×12
288 sqft
A 12×24 deck (288 sqft) is a long, runway-style deck — popular along long house elevations.
20×16
320 sqft
A 16×20 deck (320 sqft) is the canonical 'mid-large' deck — fits a full sectional, a 6-seat dining table, and a grill island.
20×18
360 sqft
An 18×20 deck (360 sqft) is upper-mid — generous for entertaining without fully committing to wraparound complexity.
24×16
384 sqft
A 16×24 deck (384 sqft) is a generous family deck with two distinct living zones — often built as L-shape or two-tier.
20×20
400 sqft
A 20×20 square deck (400 sqft) is a favorite for outdoor kitchens + dining + lounge — the smallest size where 3 zones comfortably coexist.
24×20
480 sqft
A 20×24 deck (480 sqft) is luxury-class — full outdoor kitchen + dining + lounge + grill island.
24×24
576 sqft
A 24×24 square deck (576 sqft) is a luxury build — typically commands a stamped engineer review for span requirements.
30×20
600 sqft
A 20×30 deck (600 sqft) is among the largest typical residential decks — often multi-tier with a kitchen wing.
30×24
720 sqft
A 24×30 deck (720 sqft) approaches commercial-restaurant patio scale — non-prescriptive design likely required.
30×30
900 sqft
A 30×30 deck (900 sqft) is an estate-class build — needs P.

How deck size drives cost

Deck cost scales near-linearly with square footage at any given finish tier. Going from a 12×12 (144 sqft) to a 16×20 (320 sqft) is 2.2× the area, 2.0× the cost (slightly less than linear because some fixed costs — permit, design, mobilization — don't scale with size).

Per-sqft pricing bands (national avg, 2026-Q1):

Multipliers that compound: shape (rectangle 1.0×, L-shape 1.10×, wraparound 1.22×), height (≤24″ 1.0×, >96″ 1.40×), site access (easy 1.0×, difficult 1.18×), and region (South 0.92×, West 1.28×). On a 16×20 deck, picking the wrong combination of multipliers can swing total cost by 50%.