Nosing return
The mitred end-cap that finishes an open-side tread nosing flush with the skirt.
A nosing return is the short, mitred return piece that caps the exposed open end of a tread on a stair with a balustrade down one side. It continues the nosing profile around the end of the board so you do not see raw end-grain, and it dresses the line where the balusters meet the tread. Example: on an open-string stair, each tread gets a return nosing mitred at 45° to wrap the front nosing neatly around the side. It is finish joinery, not a structural or code element, but a clean return is the mark of a quality staircase and the same profile the skirt board on the closed side carries. Open-riser stairs sometimes also return the nosing underneath.
Related terms
Stair calculators
Use this term in a calculator
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.