deposit the plans at the mavoko council offices near KMC. Include the site plan/survey plan. Pay the council fees around kes 50 per m2. Take the plans to Machakos town public health office for the public health approvals. Pay the Machakos fees, roughly 5 to 10k. Wait a few days as you play hide and seek with the approving authority. Finaly after approval, take the drawings back to Mavoko. If the drawings have issues, discuss with the planner. Its not easy to meet the planner since his office is always busy when he is in and when he is not in, he is the only aiuthority you will discuss with. Be patient till he listens to you and assists you. This should take roughly 1 to 2 months to get the final approval unless with the new Formr govt spokesman county govt, things will change. He looks the kind to straighten things out.
As Iron Sharpens Iron, So one Man Sharpens Another.