Concrete slab over deck footings (pour at same time)
I don't really see why you need footings and a slab.
If it were me I would
Forget the three footings holes on the left
Leave the slab where it is.
Swimming Pool construction in Sydney prior building construc
I recently posted about this on my blog at :
How much emphasis should you put into your R Value?
probably the biggest change for me has been to limit the window sizes. This was a no cost change and increased my last house by almost a one star rating.
Solar Power Energy
Sorry..... try this http://anewhouse.com.au/2017/02/review- ... -benefits/
What is the best window covering to protect your bedroom?
Probably a shade sail in front of window. Could be less than $100 including fixing for a large window
Or reflective window film see link for price https://www.bunnings.com.au/pillar-prod…
Retaining wall responsibility
Check this link for some information on fairness.
http://anewhouse.com.au/2012/06/retaini ... -fairness/