Residents are arguing that the tree roots are causing severe cracks in walls and ceilings, but Casey Council has so far refused to accept responsibility.

A fortnight ago, the council sent out an arborist to assess the state of the trees.

Following the assessment, the residents were told they would have to self-fund a further geotechnical engineer's investigation into soil moisture and crack assessment before the council would take further action.

Resident Brett Sutherland said he still couldn't see an end to the 18-month battle to have the problem trees removed.

Meanwhile cracks have continued to spread throughout his house.

He has resorted to contacting the Ombudsman and asking them to intervene.

"They won't do anything until we go and spend more money. The soil testing is not cheap - it would be well over a grand. Then there is no guarantee if we get it done that they will take action," he said.

"We could spend a $1000 just to get another letter saying we have to do something else."

Casey councillor Paul Richardson said he was willing to take the matter as far as was required to get a result for the residents.

He said the council had a duty of care to the residents that it had so far not met.

"They have to be responsible for the costs associated with the damage the trees have caused in the street," he said.

"I know it is the trees that have caused it, there is no doubt."

Cr Richardson encouraged local accountants to get behind the residents and offer free advice on how to take legal action against the council.

"They have been negligent and shown no duty of care."

Casey Parks and Reserves manager Trevor Griffin confirmed the independent arborist report had been completed.

He said the council was now waiting for additional information from residents before the issue would be considered any further.