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Newel
The upright post of a staircase which supports the handrail – often turned and decorated.
Nogging
Either infill of masonry laid as panels between a timber wall-frame or small horizontal pieces of timber fixed between the wall studs.
Nosing
A moulding fixture with a rounded edge.
Notch
A groove formed in the side of timber to fix into the matching side of another.
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Obscured Glass
Glass through which light can pass but objects are blurred.
Offset
A distance measured from a survey mark.
Ogee
S-shaped or double curve comprising a convex and a concave section, often seen in decorative archways.
Oil Trap
A sump to capture and prevent oils and greases entering drainage systems.
Open Drain
An open channel by which surface water is carried away.
Oriel
A bay window suspended above