T-shape deck · all 20 popular sizes
T-shape Deck Cost by Size
A T-shape deck pushes a centered platform out from the main rectangle — typically housing a grill island, fire pit, or dining table set off from the lounge area.
1.10× labor vs rectangular10% waste factor
Best for
Mid-large lots where you want a 'destination' off the main deck (firepit, hot tub, kitchen) without committing to multi-level.
Watch-outs
The T-junction is structurally complex — most jurisdictions require an engineer-stamped plan for the splice connection.
Pick your t-shape deck size
10×8
80 sqftMid composite: $4,400-$7,040
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10×10
100 sqftMid composite: $5,500-$8,800
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12×10
120 sqftMid composite: $6,600-$10,560
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12×12
144 sqftMid composite: $7,920-$12,672
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14×12
168 sqftMid composite: $9,240-$14,784
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16×12
192 sqftMid composite: $10,560-$16,896
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16×14
224 sqftMid composite: $12,320-$19,712
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20×12
240 sqftMid composite: $13,200-$21,120
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16×16
256 sqftMid composite: $14,080-$22,528
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20×14
280 sqftMid composite: $15,400-$24,640
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24×12
288 sqftMid composite: $15,840-$25,344
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20×16
320 sqftMid composite: $17,600-$28,160
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20×18
360 sqftMid composite: $19,800-$31,680
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24×16
384 sqftMid composite: $21,120-$33,792
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20×20
400 sqftMid composite: $22,000-$35,200
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24×20
480 sqftMid composite: $26,400-$42,240
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24×24
576 sqftMid composite: $31,680-$50,688
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30×20
600 sqftMid composite: $33,000-$52,800
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30×24
720 sqftMid composite: $39,600-$63,360
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30×30
900 sqftMid composite: $49,500-$79,200
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Open the calculator with t-shape pre-loaded
Use the full cost calculator to dial in your exact material, railing, stair, and footing specs. Apply the 1.10× multiplier shown above to the rectangular baseline.