The galvanised silver metal building has been likened to a jail, World War I bunker and a shipping container after being attached to the 1904 brick heritage-listed hall.

Berrigan Shire mayor and Finley resident Matt Hannan said his council, which is funding the work, was advised the style of the School of Arts could not be matched with the toilet add-on.

"Our understanding from heritage consultants is you can't replicate what is already there, so that is the design that they came up with," Cr Hannan said.

He suggested when the red-toned School of Arts and adjoining War Memorial Hall were repainted in heritage cream and green the toilet extension would blend in more.

"We need to get it finished then people can judge the way it looks," Cr Hannan said.

"I'm going to wait until it's fully done then I'll pass comment, it would be foolish of me to pass judgement at the moment."

Save the Finley War Memorial Hall Association secretary Patricia Boyd is not holding fire.

"It's bloody disgraceful, it's absolutely disgusting," Mrs Boyd said.

"It doesn't conform and it destroys the heritage look of the building; it's just so wrong."

Mrs Boyd's scorn has been echoed in posts on the association's Facebook page following the uploading of photographs of male and female toilet building.

"Looks like a shipping container", "inspired by a Passchendaele bunker from WWI" and "should rightly be named Finley detention centre" were some remarks.

The new toilets are part of a nearly $630,000 revamp of the Newell Highway complex being undertaken by Rutherglen company Ultra Project Services.

Cr Hannan said the work was appreciated.

"The user groups of the community are quite pleased with what's going on," Cr Hannan said.

"They're getting some new facilities, they're getting a new paint job inside and out."