Defined terms: Dimensional and technical measurements

Surface width – the width of a stair or ramp, measured at the tread of a flight or the surface of a ramp, between any enclosing walls, strings, upstands, kerbs or guarding. Terminal fitting – a water outlet device providing water to a sanitary appliance. Usable (with respect to buildings and parts of buildings) – convenient for independent use. Wheelchair accessible – suitable access to and usable by wheelchair users.