The keys to the courthouse were officially handed over to the successful tenderer for the redevelopment, Project Coordination, by member for Wagga Daryl Maguire, on Monday.

Project Coordination project manager Denis Cauduro is envisaging stage one of the redevelopment, which encompasses the construction of a new two-storey courthouse, will be completed by the end of next November, with stage two to follow six months later.

Stage two of the project will involve the renovation of the existing courthouse after services are transferred to the new building.

Around 100 mainly Wagga-based construction workers will be involved in the redevelopment on site at its peak.

The first works on the site involved the installation of temporary toilets on Monday, ahead of demolition works scheduled for next week, which will see the removal of old doors and benchtops, which will be recycled.

More extensive demolition will take place in the weeks following, Mr Cauduro said.

"In about two weeks' time, we'll start actual demolition of the buildings and pulling up concrete and asphalt," he said.

"Then we'll start excavation works - during those works we'll have an archaeologist here and Aboriginal persons so they can see if there are any remnants found, which they'll record and take anything they do find away for recording purposes."

The courthouse is located on what is believed to be an Aboriginal burial ground, according to Wiradjuri elders.

Mr Cauduro doesn't believe the possibility of excavating more artifacts will further delay the construction of the new courthouse.

"They have already done some testing, they've found some remnants but it hasn't been of great significance," he said.

"They believe they will find some more but it will be (a matter of) simply recording it and moving on."

The other major challenge facing the team will be the proximity of the courthouse to adjoining buildings, with the site's present footprint encroaching on its boundaries.

When complete, the courthouse's footprint will more than double, from its present size of 1535sqm to 3655sqm, and the number of courtrooms will increase from four to six.

The redevelopment up to now has been plagued by delays, with its development application originally sent to council in May last year and the plans for the new facility changed several times.

Initially slated to have three storeys, the new courthouse was cut back to two and the redevelopment was initially not going to increase the number of courtrooms available, until the government was lobbied by the South West Slopes Law Society to rectify that shortcoming.