It comes in the wake of Port Macquarie-Hastings Council's rejection of revised designs put forward by the PCYC due to the "significant financial and reputation risk to the council" and concerns of user groups including the Port Macquarie Gymnastics Club.

The PCYC, which has written an open letter to the community and the council, has called a public meeting on Thursday night to discuss the council decision.

PCYC NSW chief executive officer Darren Black said the PCYC implored the council to re-engage in a productive dialogue around the facility design and allow PCYC to participate in the dialogue with the design team and preferred builder.

"The sooner it can be started, the sooner the community and young people of Port Macquarie can benefit," he said.

The project brings together $2.5 million from the state government for a PCYC and $2.8 million from the federal government for expanded stadium facilities.

The council endorsed the original design at last month's council meeting and hopes to be in a position to award a construction contract at its October 21 meeting.

Port Macquarie-Hastings mayor Peter Besseling said the process of design and development approval for the expansion of the Port Macquarie Indoor Stadium had been rigorous and robust.

"It includes the design by PCYC architects, approval by PCYC and the Community Reference Panel upon which they sat, public exhibition of the agreed plans and development approval by an independent authority," he said.

"This included child protection considerations relevant to community groups and the PCYC."

Cr Besseling said the process continued to be consistent with all council obligations and agreements with PCYC, which had been informed of the council's position through emails, letters, phone calls, face-to-face meetings and public reports.

In an open letter to the Port Macquarie community and councillors, the PCYC NSW chief executive officer said there had been no detailed rationale or costings from council staff to back their claim that accepting PCYC's design would create "significant financial and reputation risk to the council".

"The council needs to explain what these risks are," he said.

The PCYC believes the design changes it put forward will provide benefits to the facility's operation, the users of the centre and the community.

"This [council] decision ignored essential considerations in child protection and compromised best-practice design principles," Mr Black said.

All councillors have been invited to the public meeting.

Interested members of the public are also invited to the meeting at Port City Bowling Club from 7pm on Thursday.

RSVP attendance to pmforum@pcycnsw.org.au