Alex all very good points, one you missed though is that you are also guaranteed a much better finish with precast as the walls are poured in controlled conditions…

You would need to have roof on before putting the services in and the load bearing layer is inner layer.

You can't really put much of services into the cavity as services are generally deployed during rough-in stage, when both layers of bricks are already finshed and roofing is deployed.

2. Double brick will still require chasing for services, however, chasing in brick is easier than chasing in concrete.
3. For double brick set up rigid insulation can be placed…

I can't see any single advantage of monolith concrete house:
1) it is overly expensive and requires 7-9 months of just formwork;
2) it is hard to put the services in;
3) it…

So I spoke to one of my formworkers this morning about your home. He just finished another home similar in Vaucluse.
For Class 1 formwork, which is what you are…

this can be helpful:

"Most common 2nd storey addition requested consists of a new master bedroom, WIR, ensuite, 2 other bedrooms plus a small sitting room or lounge room. The construction…