A Rotorua architecture firm is behind the designs for a memorial for the Christchurch mosque attack victims.

But it's been subject to public blowback because of the multimillion-dollar cost which comes with the proposal.

Apa Architects has drawn conceptual images of a memorial which include a water feature, education and conference centre and playground and estimates the project will cost between $10 million and $15m to build.

Since the images were released a change.org petition has been launched by Usman Afzali calling for the memorial plans to be put on hold until the Christchurch Muslim population has been considered.