"The moment they are appointed, the by-elections stop, no matter where they are in the process at that point."
The minister has indicated the term of the commission would start at the beginning of February.
While that would avoid electing "lame duck" members only to remove them, the timing would not avoid significant costs being incurred by both the council and election candidates.
The cost of the combined by-election to the council has been estimated at $285,000. The majority of these costs are incurred before voting opens.
They include advertising and the printing of envelopes, voting papers and candidate booklets.
Lampp said the council did not have any options to avoid incurring those costs.
"We are in a legislative process, it continues as is, the costs are the costs. The only option to delay the by-elections would be if there was another councillor resignation between now and when voting papers start to be delivered about January 22."
There are nine elected members at present, led by acting mayor Tina Salisbury. None have publicly indicated they intend to resign.
To date, no candidates have officially put their name forward to stand for either the mayoralty or the vacant councillor seat. Some have made public statements indicating they intend to run.