You can visit the Planning Dept at the majlis. They normally have accredited list of people to do the drawing and submission of plan.

Call few and compare quotes.

Any qualified architect can submit, not necessarily their "panel".
MPKJ has pelan setara/standard plan for terrace house (intermediate lot) back extension. Is cheaper and faster. Plan ready drawn, just fill form and purchase. If u go early morning, and wait maybe same day can get approval, else within 3 days should get approval. Owner can self submit, and self take responsibility. But no CCC ya; if want CCC need engage architect. Need construct following the drawing, ie. can't do concrete roof.