Newcastle boat yard charged me $618.20 incl GST in 2023 to lift my boat, clean the hull, and put her back in the water. Rate at the time was $12 per foot ex GST for the lift and $82 per hour ex GST for one hour of hull cleaning.
Also, have you considered joining a club? Sydney Amateurs Sailing Club has a slipway.
sasc.com.au/facilities/#Moorings "The Club offers a slipway and shipwright services at discounted rates to members. We also provide weekend slipping for members who wish to work on their vessels."
Admittedly membership fees ("joining fee: $734.00 (which can be paid in three stages over three years). Annual subscription: $786.00.") would likely offset any initial savings in slipping costs, but if you expect to be based in Sydney and slipping your boat every year or so, being able to do your own work in the slip yard on weekends might be worth it?
