Education Directorate deputy director-general David Matthews said all classrooms were available for use by the school community as of Monday after the replacement of lead-painted windows in eight classrooms in the July school holidays led to the closure of 11 classrooms.

However, one room in the Montessori preschool has been filled with furniture and access has blocked off, meaning two classes are sharing the remaining classroom for the first half of the school day.

The Montessori school kitchen facilities also remain off-limits and an estimated $10,000 worth of teaching resources have been destroyed.

Some of the resources include irreplaceable items used by the Montessori school since the early 1980s.

The Education Directorate has confirmed the work to replace the lead-painted windows cost about $250,000, however a spokesman could not say how much had been spent on environmental cleaning.

"The total cost of the environmental cleaning is not yet finalised, and thus is unknown at this stage," he said.

Tests results returned on July 21 found 13 areas near the windows that were replaced were above the target threshold, which the Education Directorate considers to be 0.11 milligrams per square metre.

The highest reading of 1.1 milligrams per square metre was found on a table top in the Montessori playroom, which is 10 times the acceptable threshold.

Mr Matthews said it was regrettable that children were in the contaminated classrooms in the Gambari centre for two days before the rooms were closed.

A series of lead clearance reports have been made available at the Yarralumla Primary School office but parents and community members are only permitted to view these reports in person with the supervision of a directorate representative.

Mr Matthews said the reports were too technical to be read without assistance.

"The objective around offering to meet with people is to answer any questions and to be highly transparent about any of the material that's available in those reports."

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Greens candidate for Murrumbidgee Emma Davidson said the reports needed to be made publicly available and accessible to restore community confidence.

"This is the digital age and we've got a lot of parents who are juggling paid work and caring responsibilities and taking care of their children and to put to put barriers in the way, such as you can only access it in person during the available hours of an education spokesperson, is not helpful," she said.

"In a strong and healthy democracy government information must be easily accessible and widely available."

Sam Mudge, who has a child enrolled in the Montessori preschool, said parents wanted to see the specific lead levels and a clear remediation plan going forward.

"Either they fix what we have or come up with a plan to knock it down and build something else," he said.

Mr Matthews said the lead management plan would be updated by October but did not say if there were plans to replace any buildings at the school.

He said future remediation work would be completed during the school holidays to minimise disruption to learning.