Start with what the remodel will change
A kitchen or bathroom remodel in St. Louis is often the first time a homeowner looks closely at the water lines behind the walls. Old supply pipes, a refrigerator line that runs through a finished wall, and a shower valve that has never been serviced are all easier to address while the room is open. If you are thinking about adding a water treatment unit, the remodel is a practical window to plan it, but only if the plan comes before the drywall goes up.
Start by writing down what you want the water to do in each room. Maybe the kitchen faucet should feel softer on the hands, the ice maker should stop leaving white flakes, or the shower glass should stop collecting spots. Those goals point to different equipment, and some may be better handled at a single fixture rather than across the whole house. Knowing the goal keeps the remodel from becoming a set of guesses.
Test the water before you design anything
Water test results give you a baseline that a remodel plan can use. A hardness reading, an iron check, or a basic chemistry panel from a certified lab tells you what the system needs to handle. Ask whether the sample came from a cold tap that represents the whole house, and whether it was collected correctly. If you have a private well, the sampling rules are stricter and the result matters even more.
Keep the report with your remodel papers. A plumber or contractor who sees it early can size equipment and plan access without guessing. A home test with strips can give you a rough sense of hardness, but strips are not a substitute for a lab result when you are making equipment decisions.
Find a home for the equipment
Most whole-house treatment equipment lives in a basement, a utility closet, or a garage near where the main water line enters the home. In older St. Louis houses, that space may be tight, uneven, or shared with the water heater and furnace. Check the space before you choose a unit, and leave clearance on every side for filter changes, salt or media refills, and service access.
Look at the drain and electrical needs as well. Many units need a nearby drain for backwash or discharge, and some need an outlet. If the remodel moves a laundry or utility wall, that is a good time to place the equipment where it will be easy to reach later.
Plan the kitchen lines
Kitchens carry the most water-sensitive connections in the house: the sink supply, the dishwasher, the refrigerator line, and sometimes an under-sink filter. Decide before the cabinets go in whether the treated line will feed the cold side only, the whole kitchen, or only the ice maker and refrigerator. Each choice changes the valve layout and the length of pipe in the cabinet space.
Ask for shutoff valves at every fixture, including the refrigerator line, and make sure they sit where you can reach them without moving the cabinets. A bypass valve at the treatment equipment lets you skip treatment for outdoor taps or a single job without shutting the whole house down. Label every valve once the work is finished.
Plan the bathroom lines
Bathrooms bring their own questions. Shower valves, tub fillers, and vanity faucets each have cartridges and aerators that collect mineral buildup over time. If the bathroom is being rebuilt, this is a good time to choose fixtures that are easy to clean and replace, and to confirm the valve body will accept the cartridge you plan to use.
Think about the water heater too. A remodel that adds a second shower or a larger tub can change how hot water moves through the house. If you are adding treatment, confirm whether the heater sits on the treated side of the system so new hot water lines are handled the same way.
Coordinate the work in order
- Gather recent water test results and a rough sketch of the home's water layout.
- Decide which fixtures should get treated water and which can stay on the untreated line.
- Choose the equipment location and confirm clearance, drain, and power needs.
- Have a licensed plumber review the rough-in plan before the walls close.
- Test the water again after the system runs and the remodel is complete.
Retesting after the work is done confirms that the equipment is doing what you planned. Keep the new results with your home records so the next person who opens those walls knows what is behind them.
What to ask your contractor
- Where will the treatment equipment sit, and who will service it?
- Which lines are treated, and where are the shutoff and bypass valves?
- Does the layout leave room for filter changes or media refills?
- Are permits required for the plumbing changes in your St. Louis area?
A clear plan now saves rework later. Water work done during a remodel is far easier to get right than a retrofit after the tile is set.