| Natural finish |  A "natural finish" typically refers to a surface treatment or appearance that maintains the inherent characteristics and aesthetics of the |
| Newels | "newels" refer to the vertical posts that support the handrail of a staircase. They are critical components in the |
| Nogging | Nogging or "noggin" refers to horizontal bracing pieces, typically made of timber or metal, that are installed between vertical studs Synonyms - Noggin
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| Nominal Size | In Australian commercial construction projects, the term "nominal size" refers to the standard or typical size of a building component, |
| Nosing | "nosing" refers to the protruding edge or lip of a stair tread or landing. It is the part of |
| OC | An Occupation Certificate is a formal document issued by a certifying authority, such as a local council or a private Synonyms - occupancy certificate
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| Off Form Concrete | "off-form concrete" refers to concrete that is left exposed after the formwork is removed, without any additional finishing or cladding. |
| Open hole inspection | In the context of Australian commercial construction projects, "open hole inspection" refers to the examination and assessment of excavated areas |
| Ordinance | In the context of Australian commercial construction projects, an ordinance refers to a local law or regulation that governs the Synonyms - Regulations
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| Orthogonal Projection | In the context of Australian commercial construction projects, "orthogonal projection" refers to a method of representing three-dimensional objects in two Synonyms - Orthogonal
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| Outside corner | An "outside corner" refers to the external angle or edge where two walls or surfaces meet. This is typically seen |
| Overflashing | In the context of Australian commercial construction projects, "overflashing" refers to the installation of additional flashing material over existing flashing |
| Overhang | The term "overhang" refers to an extension or protrusion of a building's structure beyond its main walls or foundation. This |
| Overloading | In the context of Australian commercial construction projects, "overloading" typically refers to the practice of placing excessive weight or stress |
| P trap | A P-trap is a plumbing fixture that serves an essential function in drainage systems. It is a U-shaped or P-shaped |
