A "small-to-medium"-sized Federal Government agency will be moved to Gungahlin, if the Coalition wins the federal election.

The Coalition will today commit to shifting an agency into the area, most likely from the Parliamentary Triangle.

No agency has been earmarked for the move, with the decision to be left to the Department of Finance.

ACT Liberal senator Zed Seselja said given the rapid growth around the Gungahlin area a Commonwealth presence was "long overdue".

He said the Department of Finance would consider a number of factors when selecting an agency.

"Obviously they'll look at those whose leases are up for renewal, they will be looking to get best value for money," he said.

"But in doing that, it'll be a great win for the people of Gungahlin."

The Department of Immigration and Border Protection currently has a large presence in Belconnen, while the Department of Social Services is headquartered in Tuggeranong.

Jobs to be shifted from Parliamentary Triangle

Senator Seselja said it was important the agency came from within the Parliamentary Triangle so as to not take jobs from another town centre.

"We don't want to take from one town centre to deliver for another," he said.

"There's no doubt that it's important that we see that initial presence.

"By having that initial presence of a small-to-medium Commonwealth agency in Gungahlin, I think it will open up opportunities for other businesses - and down the track a bigger government presence, be it Commonwealth or ACT."

Senator Seselja had previously been critical of a controversial pledge from Deputy Prime Minister Barnaby Joyce to move the Australian Pesticides and Veterinary Medicines Authority from Canberra to Armidale.

He said this announcement was different.

"It's very different because these are Canberra residents and many of these residents would be already living in Gungahlin and working in the Parliamentary Triangle and this will bring employment to where they live," he said.

"I fundamentally believe that the public service should be remaining strongly in Canberra and this does that.

"But it ensures that our outer suburbs and town centres get the Commonwealth support that they deserve."