L-shape deck · all 20 popular sizes
L-shape Deck Cost by Size
An L-shape deck wraps around two sides of a house — creating dining and lounge zones with a natural visual break between them. The most common upgrade from rectangular.
1.08× labor vs rectangular9% waste factor
Best for
Houses with a kitchen + family room that both back onto the yard. Lets each room have its own outdoor zone.
Watch-outs
The inner corner is a stress point — needs a 6×6 post or doubled 4×4 + cross-brace, not a single column.
Pick your l-shape deck size
10×8
80 sqftMid composite: $4,320-$6,912
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10×10
100 sqftMid composite: $5,400-$8,640
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12×10
120 sqftMid composite: $6,480-$10,368
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12×12
144 sqftMid composite: $7,776-$12,442
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14×12
168 sqftMid composite: $9,072-$14,515
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16×12
192 sqftMid composite: $10,368-$16,589
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16×14
224 sqftMid composite: $12,096-$19,354
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20×12
240 sqftMid composite: $12,960-$20,736
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16×16
256 sqftMid composite: $13,824-$22,118
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20×14
280 sqftMid composite: $15,120-$24,192
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24×12
288 sqftMid composite: $15,552-$24,883
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20×16
320 sqftMid composite: $17,280-$27,648
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20×18
360 sqftMid composite: $19,440-$31,104
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24×16
384 sqftMid composite: $20,736-$33,178
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20×20
400 sqftMid composite: $21,600-$34,560
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24×20
480 sqftMid composite: $25,920-$41,472
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24×24
576 sqftMid composite: $31,104-$49,766
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30×20
600 sqftMid composite: $32,400-$51,840
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30×24
720 sqftMid composite: $38,880-$62,208
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30×30
900 sqftMid composite: $48,600-$77,760
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Open the calculator with l-shape pre-loaded
Use the full cost calculator to dial in your exact material, railing, stair, and footing specs. Apply the 1.08× multiplier shown above to the rectangular baseline.