11 Where a development consent has discrete components and the challenge to validity succeeds in relation to only one component, it may be proportionate and reasonable to make a declaration of invalidity only in relation to that component: Canyonleigh Environment Protection Society Inc v Wingecarribee Shire Council (1997) 95 LGERA 294 at 321-322, 324. In that case a declaration was made that a development consent was "invalid but only to the extent that it approves the construction of the proposed golf course and associated golf club house". Similarly, a condition of a development consent may be severed and declared invalid, without affecting the balance of the development consent, if that would not result in the balance of the consent operating in a manner different to that in which the whole would have operated or if the condition is not fundamental to the development or does not go to the root of the consent itself: Maitland City Council v Anambah Homes Pty Ltd [2005] NSWCA 455, 64 NSWLR 695 at [162] - [167], [176]; Wechsler v Auburn Council (1997) 130 LGERA 134 at 137-138. A construction certificate has been declared invalid only insofar as it refers to certain work: Carriage v Stockland Development Pty Ltd [No 7] [2004] NSWLEC 148 at [21] and [30].