Newel Post
/ ˈnjuːəl pəʊst /
Also known as: newel, starting newel, landing newel, half-newel
Definition
A newel post is the principal vertical post at the foot, head, and any landing of a staircase, to which the handrail and balustrade are anchored. Typically 90-100mm square section, much larger than the 32-41mm square balusters between them. The newel is the structural anchor of the entire balustrade assembly and must resist a horizontal point load of 0.36 kN at handrail height (Approved Document K). Poor newel fixing - the most common stair fault - causes wobbly or unsafe balustrades. The handrail must be a minimum of 900mm above the stair pitch line in domestic properties.
In practice
Newel post fixings are frequently inadequate in both new and older houses. A common failure is screwing the newel post down through the bottom tread or into the floor surface with a few long screws - this rarely provides adequate lateral resistance. The correct method depends on the stair type and position: for an open-plan stair with the bottom newel on a solid concrete floor, a bolt-down post base (proprietary stainless steel fixing) is used; for a timber floor, the newel can be bolted through the trimmer joist at the staircase opening from below, or the post can extend down into the floor structure. Testing the rigidity of a newel post by applying lateral force at the top quickly reveals whether the fixing is adequate.
The gap between balusters is a common non-compliance - Approved Document K requires that a 100mm sphere cannot pass through any gap in the balustrade. Standard baluster spacings of 100mm or more (common in older or budget installations) fail this test. New staircases must be designed with baluster centres of typically 90-95mm maximum to ensure compliance. For landing balustrades adjacent to a staircase opening, the height requirement increases to 900mm measured from the landing floor level.
See also