When do you need a landing on stairs?

The IRC does not mandate a specific maximum flight height before requiring a landing, but many local codes require one when vertical rise exceeds 12 feet (approximately 147 inches or about 19 steps). Landings are always required at the top and bottom of every staircase, and at any point where the stair changes direction. Exterior stairs connecting to a door also require a landing at least 36 inches deep.

How big does a stair landing need to be?

Per IRC R311.7.6, a stair landing must be at least as wide as the stairway it serves and at least 36 inches deep measured in the direction of travel. For a standard 36-inch wide staircase, the minimum landing size is 36 x 36 inches. For U-shaped stairs, the landing spans the full width of both flights plus the wall between them.

What is the difference between L-shaped and U-shaped stairs?

L-shaped stairs make a 90-degree turn at the landing, requiring a single square landing platform (typically 36x36 inches). U-shaped stairs make a 180-degree turn, with two parallel flights connected by a wider rectangular landing. U-shaped stairs take up more width but less length than straight stairs. Both types are common when there is not enough room for a full straight run.

How do you calculate stairs with a landing?

Divide the total rise by the ideal riser height (7 to 7.75 inches) to get the total number of steps. Split the steps equally between two flights. The landing height equals the number of steps in the lower flight multiplied by the actual rise per step. Total horizontal run equals the run of both flights plus the landing depth.

Does a landing count as a step?

No, a landing does not count as a step or tread. The landing is a flat platform at the same level as the last tread of the lower flight. The first riser of the upper flight rises from the landing surface. When calculating riser heights, the landing itself has no riser — it is simply a wider tread at the transition between flights.

How much does adding a landing to stairs cost?

Adding a landing increases staircase material costs by $200 to $800 for framing lumber, subfloor, and finish materials. Professional labor adds $300 to $1,000 for the landing alone, as it requires structural framing similar to a small floor section. Total additional cost for an L-shaped landing is $500 to $1,800 versus a straight stair, with U-shaped landings costing $800 to $2,500 extra due to the wider platform required.

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Comment utiliser ce calculateur

1Measure the total rise from finished floor to finished floor in inches.
2Enter the landing depth (minimum 36 inches per IRC, matching stair width).
3Enter the desired tread run per step (10 inches minimum per IRC).
4Click Calculate for total steps, steps per flight, landing height, and total run.

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À propos de ce matériau

Stair landings are intermediate platforms that break a long staircase into two or more flights. The IRC requires a landing at least as wide as the stairway and at least 36 inches deep in the direction of travel. Landings serve multiple purposes: they provide a rest point on long staircases, allow directional changes (L-shaped and U-shaped stairs), and improve safety by limiting the distance a person could fall. The IRC does not specify a maximum flight height before requiring a landing, but many local codes require a landing when the vertical rise exceeds 12 feet or 147 inches. Landings are framed like small floor sections, using joists, headers, and decking supported by posts or walls. For L-shaped stairs (90-degree turn), the landing is typically a 36x36-inch platform. For U-shaped stairs (180-degree turn), the landing is wider to accommodate the direction reversal — usually 36 inches deep by the combined width of both flights plus the wall between them. Landing framing uses 2x10 or 2x12 joists, supported by a ledger board on one wall and posts or a bearing wall on the open sides. The landing surface matches the tread material: plywood subfloor with carpet or hardwood for interior stairs, or pressure-treated decking for exterior applications. A landing adds $200 to $800 to the staircase material cost, plus $300 to $1,000 in labor for a contractor installation.

Étapes suivantes :

Stair Calculator →Stair Stringer Calculator →Rise Over Run Calculator →Deck Stair Calculator →

Conseils de pose

•Frame the landing as a miniature floor system — use 2x10 or 2x12 joists at 16 inches on center.
•Secure the landing to adjacent walls with a ledger board using lag bolts or structural screws.
•Ensure the landing surface is perfectly level — use a 4-foot level in both directions.
•Match the landing height exactly to the calculated rise of the lower flight to avoid uneven risers.
•For L-shaped or U-shaped stairs, frame the landing before cutting and installing the upper flight stringers.

Erreurs courantes à éviter

Making the landing too shallow — it must be at least 36 inches deep in the direction of travel (IRC R311.7.6).
Not treating the landing as a structural element — it needs proper joist framing, not just a sheet of plywood.
Unequal riser heights at the landing transition — the riser onto and off the landing must match all other risers.
Forgetting to account for landing thickness when calculating flight heights — the landing platform itself has height.

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