HELP! Electrical work after handover?

Single or Double storey?

That makes it much easier to do work after as they can get into the roof for things like lights (and can run additional stuff down walls if needed.

I think anything that needs to be mounted on a brick wall you should get the builder to do. Chasing through brick veneer is possible, but time consuming.

The rest you could do later.

Speaking as a comms/data/alarm installer it's 1000% easier to run cables on external facing walls in a brick veneer house, even if there is insulation in the walls - cables can be run from bottom OR top, so after cutting out the plaster for an plate my options were either using a yellowtounge or dropping a string.

If you must have extra outlets on internal cavity walls, consider that the sparky will need to drill through noggins and risk penetrating out of the plaster. In my time it thankfully only happened to me twice, but not a good feeling making a mistake on a new house - and more so if it's a feature wall.

For internal walls think about locating stuff on the back side of built in robes or where there is a box void (but not the heating return air void) - it gives the installer a perfect place to conceal the cabling.

Personally I am planning my build at the moment and my only real change to the electrical design is adding a double GPO on the island bench in the kitchen and extra outlets in the splashbacks (make any mistakes the builders problem, not yours). Everything else I am looking at adding after handover goes in an external wall, above a noggin or in a box void.

TV outlets are a no brainer - cable to whereever the TV is located. Take a look around the area to get an idea on the size of antenna that is suited for the location. A single antenna can typically handle 2 or 3 outlets without amplification as long as it is suitable for the area, but anything more than that should use a small distribution amplifier.

For data cabling think about where you would usually do things in the house before going overboard and putting 2 or 3 sockets in each room!

My rule of thumb is to not worry about data in bedrooms unless you plan to use an apple TV or other media player - they may have inbuilt wifi but nothing is more reliable than (new) copper (please don't flame me anti-FTTN peeps!)

Same goes for the TV positions in the living areas, gaming on consoles (PS/Xbox/Wii) is another that benefits on cabled connections so look at doing 2 or 3 sockets there.

I am getting my builder to install a NBN hub (http://builtboards.com.au/nbn-enclosures/) for me so the NTD and router goes in that inside the garage so I can patch either the data or voice as needed to the outlets around the house.

I would add conduits onto all light switches on single brick walls (even in the bathrooms).
If you are going to be installing downlights, ask the builder if they can just leave the junction boxes in the ceiling cavity instead of drilling through. If they cant, then choose a position where you would potentially have an LED light.
I suggest installing all the double powerpoints with your builder, especially those on internal brick walls.