A Midwest construction company has refused further work on a public housing unit complex in Geraldton after repeated damage, theft and threats to workers.

Builder David Crothers said he was frustrated at the behaviour of community members, after contractors were terrorised during a nine-month period while trying to restore derelict housing in Spalding.

"One of our apprentices was hit in the head with a rock thrown by a child," Mr Crothers said.

"The mother chose not to do anything about it when confronted with our site manager.

"Other than that, we had tools pinched out of our container, out of vehicles through the course of the day, damage done to fencing in an ongoing situation."

The work is part of the $9 million Spalding Revitalisation Project to upgrade public housing, roads and parks to discourage anti-social behaviour.

"It got very, very severe towards the end of the contract, and it was quite disturbing for us as part of the community of Geraldton," he said.

"We had considerable, ongoing damage done in relation to the renovations in repairing the 12 units."

Mr Crothers said the night his construction company handed the completed units back to the Department of Communities, they were trashed before tenants could move in.

"A group of individuals managed to kick their way into the eaves of the buildings, get up into the ceilings push gyprock ceilings down, pull electrical cables," he said.

"There were clothes lines damaged and the kicking in of the metal fences between the units."

Mr Crothers said he rejected a request by the Department of Communities to repair the units.

"They asked us to repair the damage and we said that we would not wish to do it, because it [damage] would probably continue," he said.

"They know they need to get people in as quick as possible once completed because that then restricts the damage that could happen."

A spokesperson for the Department of Communities said tenants had began moving into the new homes on Bogle Way this month.

"The Department of Communities is committed to providing safe, secure and appropriate housing for its tenants," it said.

"Communities has issued maintenance orders with our head contractor to rectify all damages."

Police said they are investigating the incident and ask any witnesses to contact Crime Stoppers. 

Residents of the Spading units — some who had been homeless for up to two decades — did not want to be identified but spoke to the ABC and said they were grateful to finally have a home.