"Vandalism of new homes, while uncommon, has implications on our ability to house families that are in real need of warm and dry housing in Napier."
Housing Minister Phil Twyford declined to comment, stating it was an "operational decision for Housing New Zealand".
A police spokeswoman said properties that hadn't yet been moved into were often targeted by thieves.
She said they hadn't seen a spike in thefts from these sorts of sites in the Hawke's Bay recently.
Police Minister and Napier MP Stuart Nash said the fact HNZ needed a guard was "terrible".
"Here we are building houses for the most vulnerable in our communities and we have got real ratbags out there ripping off the most vulnerable to the point where we need security ... that's disgusting."
Since 2015/16, Housing New Zealand has paid for security to guard 68 properties around the country.
Three homes in Auckland and one in Christchurch required those services for more than a month.
How many HNZ properties have needed security since 2015/16?
Auckland - 43
Far North District - 6
Hawke's Bay - 1
Lower Hutt City - 1
Whangarei District - 17