The development is expected to offer 89 new parking spaces for the construction workforce tasked with completing the war memorial's controversial $500 million redevelopment project, which is still subject to final approval by the National Capital Authority.

The site, located on Treloar Crescent on Campbell High School grounds, will be used to house the temporary parking spaces with the ACT government leasing the unused land to the memorial for three years before it is returned to the school.

The ACT Education Directorate said the memorial approached the school last year to seek permission to build its temporary car park.

It agreed to offer the land with the school and its community supporting the initiative.

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Campbell High School's Parents and Citizens' group said it welcomed the additional parking spaces.

"The P&C understands that the car park will be a welcome addition to the school's facilities," a spokesperson for the group said.

"The project management team for the upgrade of the war memorial recently met with the P&C to discuss the car park and other planned construction activities.

"No major issues were raised and we are confident that effective processes are in place to address any issues that might arise in the future."

The car park's construction will be paid for by the memorial without any cost to the school or ACT government.

Once the three-year lease is finished, it will be returned to the school, which will be able to decide whether to upgrade the facility to a more permanent structure or retire it.

"The car park is being built to a temporary standard," a directorate spokesperson said in a statement.

"The Education Directorate will determine closer to the end of the AWM use period whether to upgrade and retain this car park or to have the AWM return it to its former state.

"There are no direct financial costs for the school or the Education Directorate associated with the construction or operation of the car park during the construction of the extension to the AWM."

It added there would be no visual impact on the school's facade.

Construction for the new car park is expected to begin during the mid-year school holiday period with plans for completion by July 23.

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