Council community services general manager Simon Pickford confirmed it had more than 20 complaints about nearby addresses with Building Act non-compliances and most if not all resulted in the discovery of structures which had to be altered or removed.
It started with a neighbour issuing a complaint about Mr Anderson's property.
Council policy meant the property of the person who made the complaint was also checked and non-compliant structures were found there also, Pickford said.
This person later sent a list to the council of houses in the area with similarly non-compliant structures.
This was accompanied by photographs which seemed to have been taken from a drone.
New Zealand law requires consent from owners of properties over which drones are being flown and drones are usually not allowed to be used within 4km of an aerodrome, which this area is.
The council considered whether or not this meant it could accept the information, given it was possibly gathered illegally, he said.
It decided it could act on the list of addresses.
The council did not seek out these properties, but had to act on complaints, Pickford said.
"The way this developed is a complaint between two neighbours. The council was brought in as a weapon, unfortunately."
It was an issue of "pettiness" between neighbours.