The construction or installation of a farm building or other structure used for the purpose of an agricultural activity is development specified for this code if it is:(a) constructed or installed on land in Zone RU1, RU2, RU3 or RU4, and(b) not constructed or installed on or in, or in relation to, a heritage item or a draft heritage item.
State Environmental Planning Policy (Exempt and Complying Development Codes) 2008