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ah28(Newbie)Newbie
21 Apr 2026

Hi I intend to do a knockdown/rebuild & move into (PPOR) a previously rented out property. Do i need to get a valuation prior to the knockdown (existing house & land) for CGT calculation purposes if/when we sell later? If so, is a bank valuation suitable?

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3 replies
43 views
3 replies

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Bruce4Tax(Taxicorn)Taxicorn
21 Apr 2026

Do i need to get a valuation prior to the knockdown (existing house & land) for CGT calculation purposes if/when we sell later?


Only if you are going to develop the site for sale - then proper advice required.


If so, is a bank valuation suitable?


No


ah28(Newbie)Newbie
22 Apr 2026

Ok thankyou, are you able then to demonstrate how the GST is calculated under the following example scenario:

  1. Owned a rental property from Jan-2015 to Feb-2020, purchased for $450k.
  2. We move into the rental property (tenant exited) and use as holiday house (not PPOR) from Feb-2020 till now. The current holiday house market value is approximately $1.2m.
  3. We demolish the holiday house Oct-2026 & build a new house which then becomes our PPOR, completed Jun-2027. The estimated build cost is $1.1m.
  4. We sell the property in Jun-2046 (~20 years from now). Lets say its value at that time is $6.0m.

I have reviewed similar questions on this forum and am still confused (including the formulas). I have been also recommended by my financial advisor to get a valuation prior to the knockdown, to assist with later calculations which contradicts your above response?

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