The costs of migration can vary a lot and there are many factors to consider.
From person to person and from family to family - there are always individual circumstances and factors that can play a role in the overall costs.
Each migrant has his or her own standards and requirements. One migrant takes up residency in Sydney, the other in Adelaide - all of these factors greatly influence the cost of migration.
Visa costs also vary a lot, and depends on the specific visa class - costs can be from AU$ 200 to as much as AU$ 70 000 (for a parent contributory visa).
In most cases, the total visa costs (including all government fees as well as professional fees) are +- AU$ 5000 - 7000 for a family unit.
When looking at migration costs, there are four major costs to consider:-
The migration application costs
The physical move to Australia (air fares, entries to validate the visa, shipping costs of household goods etc)
Cost of settling in Australia (rent, buying cars etc)
Other discretionary and misc costs.
As rough guideline the minimum you should budget and have available is:-
This includes ALL costs (1) to (5)
Single migrant : AU$ 12 – 18 000
Couple : AU$ 20 – 30 000
Family of 3 or 4 : AU$ 30 – 40 000
Family of 5+ : AU$ 50 000+