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Stairs Calc

Volute

The spiral scroll that terminates a handrail over the bullnose step.

A volute is the decorative spiral scroll that finishes the bottom of a handrail, curling around above the starting newel post — usually over a bullnose step. It is the most ornate of the handrail "fittings" (alongside turnouts and over-easings) and signals a traditional, formal staircase. Example: a right-hand volute spirals clockwise as you face up the stairs, sitting on a cluster of balusters that follow its curve. Because the volute caps the rail end, it can serve as the required graspable termination so the handrail does not stop abruptly in mid-air. It is decorative joinery, not a code element, but the rail it ends must still meet the 34–38 in (864–965 mm) height rule along the flight.

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Related terms

Bullnose step A rounded starting step, wider than the flight, that wraps past the newel. Handrail The graspable rail along a stair; code height 34–38 in above the nosing line. Newel post The sturdy anchor post at the end or turn of a railing. Handrail extension The code-required horizontal run a handrail must extend past the top and bottom steps.

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Written by the Stairs Calc editorial team. Methodology and code references: see our methodology.

Built and maintained by builders, drafters and engineers who plan stairs for a living — every code limit is transcribed from the published standard and cited to its exact section.

Last reviewed 2026-06-20 against IRC 2021/2024

Stairs Calc gives accurate geometry and checks it against published building-code limits, but results are estimates for planning. Codes are adopted and amended locally and change over time. Always confirm dimensions against your local adopted code and a licensed professional before you build.