Children in preschool, kindergarten, the Montessori school, grade 3/4 and after school care have been relocated while deep cleaning is being completed to reduce lead levels.

CJ Copeland said her kindergarten child was learning in the corridor and had to use portable toilets because their classrooms and toilet block weren't safe.

"It's worrying how far behind these kids could fall because of all these disruptions," she said.

"We can't let things fall through the cracks like this, it's unacceptable."

Lizzie Christiansen Young pulled two of her children out of school at the beginning of Term 3 when she learned about the ongoing lead paint remediation and makeshift classrooms.

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She said the teachers had been brilliant during the upheaval but the school buildings had been neglected for many years.

"I think the government need to sit back and have a good look at these schools and say they are part of the community and they need some investment," she said.

Opposition spokesperson for education Elizabeth Lee criticised the delay to taking action.

"After the challenges of COVID and disruptions to children's education, to be left without a classroom in the middle of winter because of this government's failure shows a complete lack of care and respect for our school communities," Ms Lee said.

"Canberra should have the best schools in Australia. Instead results are lagging behind and this government can't even be trusted to deal with an avoidable major health risk to our students."

Ms Berry said the situation did not pose a major health risk because it was being managed appropriately.

"There is lead based paint in many older buildings," she said.

"The Education Directorate has responded to this situation in line with expert advice and responded to the recommendations in the April 2019 report by mid 2019."