Generally their usual charging rates. If it is a straightforward estate like you say, appointing a child might be fine, it just depends on your circumstances. E.g. how many kids do you have, do they get along, are you excluding any, is there a risk of a claim? There is often more work to do than people realise as well: notifying everyone one that you have passed away and closing accounts including banks, government bodies, super funds, insurers, ambulance cover, share registries, and utility suppliers.