Sorry to hear seems not much progress on any definitive answers on determining original source of water or even if there was one.
The previous moisture conditions, trees, fill etc. may be playing a secondary role but from what you've posted it just 'feels' like something has been missed somewhere and that is what needs to be found.
Reading over the past posts, the attention has been on leaking pipes, water coming into site, poor drainage etc. which is understandable. Just curious, has the house wall cavity drainage (if present) been discounted yet? Weep holes functioning, no irregularities with relative heights of slab checked out? This would have required holes drilled through the external walls and a look around with pinhole camera.
If slab construction possibly dubious someone should also check that concrete hasn't been lost externally into the rolled fill around deepened detail at front-will anchor slab if lost 'unseen'.
Checking the above may not reveal the answer but are cheap and simple to do and will provide more information which seems a bit short at moment. Currently you have gained enough information for each party to deny liability and are awaiting a fix without being able to clearly define the cause. Understandable that you are over it.
Hi donovanjd,
Now I got same issues like you. I built my new house with Carlisle three years ago in Werribee. I found many cracks on ceiling and wall few months ago. The builder inspected my house and then he said I need to remove footpath and reinstall because it hasn't proper angle according to Victoria building regulations. And then he needs to monitor the house heaving. So I asked him if I replace the footpath, is the slab heaving going to be steady? But he never answered about my question and keeps talking about other things. I'm so frustrated now. I just need a clear solution about my problem.
Can you share your situation with the builder at the moment? And please recommend me a expert solicitor in the slab heaving in Victoria if you know.
Thank you.