I don't think you'll be able to extend Dazzler, you might encroach on the boundary setback. Not sure if its 900 or 1800mm setback on that boundary and you have to stay 6m from the front boundary. I kinda sorta maybe might've been the estimator/contract manager for that build and part of the existing additions, it started life as a 2 bed 1 bath cottage.
Anstey homes built it, they're still around as far as I know in Byron bay, Mike Matthewson is/was the draftsman and general dude to get the DA's done guy. He'll be able to tell you if you can or can't.
A mate of mine was chief hammer swinger and supervisor for the builds, he is just across town, has his own building company now, highly recommended tradesman. Matt Pedlow, Pedlow building 0402 363 378. Yes I would recommend Matt over the other mob to do any extension if it is even possible.....but I don't think it will...unless you go up?.
I'm retired. Nuff said?

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