In a judgment issued yesterday, the Court of Appeal said the property was bought for $375,000 in 2007.
"In this particular case, the facts were very much in our favour, in that Mrs Hayward was an innocent wife, knowing nothing about her husband's criminal activity, which is unusual in this area of law," her lawyer Richard Gay said.
"The Court of Appeal rightly stated that her interests should be construed in terms of the Property Relationships Act, and given the 50 per cent share in the untainted equity of the home," he said.
"Sadly, the couple will lose their home but it will mean that from the sale proceeds Mrs Hayward receives something in excess of $200,000 rather than the $52,000."
Earlier, authorities alleged Mr Hayward made $404,293 from selling cocaine. But in the High Court, Justice Geoff Venning fixed the Crown's maximum recoverable amount at $382,259.
Mr Hayward was part of a high-profile cocaine ring centred on Auckland nightlife hot spot Ponsonby.
He has since been released from jail. The couple are still married.