In a statement issued by the organsation late on Wednesday afternoon, NSW/ACT state manager Nicole Jones said testing of the soil and air around the centre had returned negative results for Amosite fibres.

But despite this, Ms Jones said the centre would still permanently shut down, as it was too much of a risk to leave open.

"Our first priority must be to ensure the safety and wellbeing of our children, staff and families. While the soil and air is clear, we know there are Amosite fibres in the walls," she said.

The Bindel Street centre was originally closed on July 4 after pinholes and nail holes were found inside the walls of the building during a routine inspection, which led to fears the centre may be contaminated with asbestos.

A Goodstart Early Learning spokesman had previously said on Wednesday the centre had closed as a precaution and would not to reopen this week, but left open the possibility of a re-opening at a later time.

However a second announcement on Wednesday afternoon confirmed the centre would be closing for good.

Ms Jones said given the nature of their business, Goodstart Early Learning believed they could not continue running the Aranda centre knowing there were Amosite fibres in the walls.

"This may pose an ongoing risk and significant disruption to families that we are not prepared to take. In addition, the ongoing management of this type of Asbestos places unrealistic responsibilities onto our staff, whose primary focus should be on the care and education of our children," she said.

She said they didn't take the decision lightly and Goodstart would be determining placements at their other Canberra centres according to Federal government guidelines.

ACT Work Safety Commissioner Mark McCabe said the childcare centre had certainly been put through every test imaginable in the last two weeks although it is impossible to give a 100 per cent guarantee of the future.

“A business has to do everything they can reasonable and practically do and Goodstart have been doing everything they can to give that guarantee,” he told ABC Radio.

Goodstart had been a tenant of the Bindel Street building since 2010 although management had no record on any installation or removal of any amosite asbestos from the childcare centre.

"It does appear very likely that the Amosite asbestos located in the wall cavities would be as a result of the building having “Mr Fluffy” loose fill insulation installed in the ceiling cavity at some time in the past," said the Goodstart spokesman.

"While this was removed in the 1980’s as part of the Commonwealth Government’s asbestos program there are some dust remnants behind our walls in the cavities, cornices and joists."

Non-invasive inspections of the building were carried out in 2010, 2011 and 2013 although those inspections did not break into the walls and ceilings of the building, and as such the amosite absestos was not expected.

"The Worksafe ACT inspection carried out in May 2014 however, was an “invasive” survey that did penetrate the walls and the ceiling and led to remnants of loose fill Amosite insulation being detected in areas that are otherwise inaccessible during everyday use of the building," said the spokesman.

Mr McCabe said in early July there was no evidence there had been any asbestos exposure to people at the centre after the discovery insulation reminants

“They’ve had their monitoring done and there are no fibres in the air within the building and they’ve found no fibres within the precinct of where the children are playing,” he said. “So it’s all a precautionary measure at this stage.”

Mr McCabe said that, while the holes were considered very low risk, it was always best not to take any chances when it came to dealing with asbestos.