External alterations to existing residential accommodation (other than a dwelling house) or existing ancillary development to residential accommodation (other than a dwelling house) is development specified for this code if the development is--
(a) on land that is not within a heritage conservation area or a draft heritage conservation area, and
(b) on land that is not identified as being within a flood control lot, and
(c) not the erection of a new balcony, deck, patio, terrace or verandah.