You need to check your insurance Product Disclosure Statement (available online to download) and see what it says mines says
POLICY 1
up to 15% of your building sum insured for temporary accommodation costs and loss of rent (see Special Benefits 1a and 1b of Policy 1);
SPECIAL BENEFITS
1 Temporary accommodation / rent / contributions / storage a Temporary accommodation
When You occupy Your Lot/Unit
We will pay the reasonable cost of Temporary Accommodation You necessarily incur if Your Lot/Unit is made unfit to be occupied for its intended purpose by:
i loss or damage that is admitted as a claim under Policy 1; or
My understanding would be that if you have an insurance claim it’s the insurer you would talk to and if they have agreed relocation it is up to them to pay for you to be relocated (as per your policy) and for them to claim it back from the builder. Let the builder and insurance fight it out just ask for your rights under the insurance policy.