Peace Commissioners can't charge.
I've had reason to use them over the past few years and i've paid them. I just didn't give it to them but asked was there a charge and each time was told €20. I paid and didn't mind to tell you the truth. I certainly didn't know there was no charge.
It would be interesting to know if others have had a similar experience? Who appoints Peace Commissioners and what, if any, qualifications do they have or need? Any I know are politically minded though some would have you believe they're not.