DeckMath
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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

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.