I think it is not unreasonable to expect the person assisting (in exchange for remuneration) with the submission of the application to actually be able to answer what the requirements are. How can he/she actually correctly complete the process if not knowing (with reference to rules/legislation/bylaws) what is required?
Most places simply follow/ed/s what Cape Town did, so it is likely that the on paper requirements will look the same. Whether anyone at COJ will check whether the person is registered only time will tell.
Older info floating around online suggests ECSA registration would be required by COJ
from 2019
There is also the possibility of “Industry accredited installers” being able to sign-off the install but that requires SANS10142-1-2 to be published and I do not think it is yet.
EDIT: seems SANS10142-1-2 is published/active - this could possibly leave space to allow a municipality to require ECSA registration or another Industry accredited qualification. They (municipality) should still say what is required and person claiming to be able to sign-off should be able to reference this.