Gap in wall skirting, window frames, cabinet and garage door
Some gap fillers, silicone, "no more gaps", should address most issues.
For the garage wall you need a combination of brush type door seals
Assuming the NBN connection is Fibre-To-The-Premises (FTTP) -
Once the NBN Co contractors have installed an NBN PCD (external fibre junction box) on the outside wall of your property, you…