Between July last year and June this year $213 million was withdrawn from KiwiSaver accounts to do just that.
"However, the other eligibility criteria is that the member must never have owned property before, either on their own or jointly with others," says Singleton.
"As your son is the co-owner of the property, unfortunately he will not be eligible to make a KiwiSaver first-home withdrawal."
Unless your son gets into real financial difficulty or decides to permanently live overseas in any country other than Australia, his KiwiSaver funds are tied up until he hits retirement age. There are some circumstances where a person who has owned a home before but no longer does can apply to buy a house using their KiwiSaver funds.
This is aimed at people who, through a change in monetary circumstances - maybe a relationship break-up or a failed business - are back to square one financially.
In this case Housing New Zealand, rather than the KiwiSaver provider, will assess whether a person is in the same financial position as someone buying a house for the first time.
Disclaimer: Information provided is stated accurately to the best of the respondent's knowledge at the time of publication. It is general in nature and should not be construed, or relied on, as a recommendation to invest in a particular financial product or class of financial product. Readers should seek independent financial advice specific to their situation before making an investment decision.
To have your KiwiSaver questions answered by the NZ Herald's panel of industry players, email Helen Twose.
Helen cannot answer all questions, correspond directly with readers, or give financial advice.