Step 1 · Planning and Permitting
The first and most critical step is to create a detailed plan and obtain the necessary permits. Begin by drawing a schematic of your home's plumbing system. Identify the location of every fixture (sinks, toilets, showers, washing machine, etc.), noting both hot and cold water lines. Decide on a central, accessible location for the PEX manifold, such as a utility room or basement wall. Plan the route for each PEX line from the manifold to its respective fixture, aiming for the most direct path with the fewest bends. Based on this plan, create a comprehensive materials list including the total footage of 1/2-inch and 3/4-inch PEX tubing, the number and types of fittings (elbows, tees, adapters), valves, pipe hangers, and the manifold itself. With your plan in hand, contact your local building department to apply for a plumbing permit. Do not begin work until the permit is approved.