Residents have been asked to be on the lookout for a black Volvo Saloon registration GQA1. The occupants are described as male Europeans. One is aged 50 but looks younger and two others are younger men.
The group are from Ireland or the UK but came to New Zealand via Australia.
If they turn up at a property, police say they should be turned away at the front gate or door and to ring 111.
They sometimes try to intimidate and if that happens people should call 111 immediately and advise the men of that fact.
General advice from the police is to never accept work from "tradespeople" who cold call. People needing work done should arrange it with reputable companies or contractors that can be checked out.
Websites are available to check the quality of work provided and word-of-mouth with friends and family is as good a quality-control option as exists.