Should I repipe before or after a remodel?

Two projects on a house built before the mid-1990s tend to arrive together. The kitchen is dated, the master bath is worse, and somewhere in the planning a plumber or inspector says the supply pipe is polybutylene, or galvanized, or CPVC that cracks when you look at it. Now there are two jobs, and the order you do them in decides how much of the new work gets cut open again.

The short answer is repipe first, or during demolition. Here is why, and how the sequence works with a general contractor, permits, and the tile you never want to cut twice.

Why the order matters

A repipe reaches every fixture in the house through small drywall openings: behind the shower valve, under the sinks, behind the toilets, at the washer, at the water heater. A remodel opens those same walls, and a lot more, down to the studs.

If the remodel comes first, the new shower gets tiled over a shower valve fed by pipe you already know is failing. The new vanity goes in over old supply stubs. The new backsplash covers the wall the kitchen line comes through. When the repipe happens a year later, the plumber is looking for a way to reach those spots without ruining the finish, and sometimes there is not one.

If the repipe comes first, the plumber runs the new lines while the walls are open, the inspector sees them, and the remodel closes over new pipe. Nothing gets opened twice.

The sequence that works

1. Plan both jobs before either starts. The plumber and the general contractor need to talk, because the plumbing rough-in has to fit between demolition and drywall.
2. Demolition. The remodel crew opens the walls in the rooms being redone. The repipe crew makes its own small openings in the rooms that are not.
3. Repipe rough-in. New lines through the attic and down to every fixture. In the remodeled rooms, this is also the moment to move a supply to a new location if a sink, shower, or washer is changing walls.
4. Rough inspection. The plumbing inspector sees every new run under pressure before anything covers it. Tile and drywall wait for this.
5. Close the walls. Drywall, backer board, tile, cabinets, in the remodel rooms. Patch and texture in the others.
6. Set fixtures and final inspection. Faucets, shower trim, toilets, the water heater connections. The plumbing final closes the permit.

That is one repipe, one set of openings, one patch job, and one inspection schedule, instead of two of each.

Moving fixtures while the walls are open

A remodel is the cheapest moment a fixture will ever move, and a repipe makes it cheaper still, because every supply line is being run new anyway. If you have ever wanted the washer in a different closet, a second sink in the master bath, or a pot filler over the range, this is when to say so. Once the lines are in and the inspection is passed, moving a fixture means opening finished work.

Drains are a different story. A repipe replaces the supply lines, not the drains, and moving a drain on a slab home means cutting concrete. That can be done during a remodel, but it is its own decision with its own cost, and it is worth knowing which side of the line a change falls on.

Working with the general contractor

Most general contractors are glad to have the repipe handled by a licensed plumber who does them every week. What they need from that plumber:

• A schedule. How many days for the rough-in, and when the crew needs the walls open.
• Inspection timing. The plumbing rough inspection gates the drywall and tile. The GC needs to know when to call for it and how long the wait tends to be.
• The permit arrangement. The plumbing may run under the remodel permit as a sub-permit or as its own plumbing permit. Either way, the plumber’s license number is on it. Confirm that before work starts.
• One point of contact for surprises. Old homes hide things. A plumber who opens a wall and finds a corroded drain, a rotted stud, or a live wire needs to know who decides what happens next.

What doing it later costs you

There are no dollar figures here, because they depend entirely on the house. But the shape of the cost is easy to describe. A repipe after a remodel means opening finished walls and a patch that will never quite match a new texture. It means the plumber working around a tiled shower valve from a closet on the other side, if there is a closet. It means new cabinets pulled to reach supply stubs. It means a second permit and a second inspection cycle. And it means a stretch of time with a known failing pipe feeding your new kitchen, where one leak can take out a cabinet run and a floor.

The reverse order costs nothing extra. It only costs planning.

Where a homeowner’s role ends

Sequencing, fixture placement, and finish decisions are yours, and the more of them you make before demolition the smoother both jobs run. The plumbing itself is permitted, inspected, licensed work, and so is most of the remodel. If a contractor proposes doing the repipe without a permit to keep the schedule moving, that is the moment to slow down; an unpermitted repipe under a permitted remodel is a problem at sale and at claim time.

If you are planning a remodel and are not sure what the pipes are made of, send us the year the house was built, the rooms you are redoing, and a photo of the lines at the water heater. We will tell you whether a repipe belongs in the plan and how to fit it into your contractor’s schedule.