How long does a whole-house repipe take?

A repipe follows the same broad steps no matter the material, and knowing the sequence helps you picture where the days go.

The first stage is protecting the home and opening access. The crew lays drop cloths and plastic over floors, furniture, and counters, then cuts small access holes in walls and ceilings to reach the existing pipe and route the new lines. This setup is methodical work, since every fixture run has to be mapped before anyone cuts.

Next comes running the new lines from a central point out to each fixture. With PEX, a plumber pulls flexible tubing through wall cavities and attic space with few joints, which is the main reason it goes quickly. With copper, the crew measures, cuts, and solders rigid sections and elbows at every turn, and that joint-by-joint work is what stretches a copper job to several days.

After the pipe is in, the system is pressure-tested to prove there are no leaks before anything is closed up. The plumber caps the lines, charges the system, and watches for any pressure drop. Only once it holds does the work move on.

A permit inspection follows. In many cases a city inspector visits while walls are still open, which is often a separate day that depends on the inspector's schedule rather than the crew's. Once the work passes, the final stage is to patch, tape, texture, and prime the drywall so the walls are ready to paint. Texture and paint can add their own drying time on top of the plumbing days.

The gap between a 1-to-2-day PEX job and a 3-to-5-day copper job comes down to how each material is joined. PEX ships in long flexible coils, so a plumber can run a single line from a manifold to a fixture with few or no joints hidden in the wall. Fewer joints means less labor and fewer points to test.

Copper is rigid. It needs a fitting and a soldered joint at every bend, tee, and connection, and each of those is hand-work: clean the pipe, flux it, heat it, and feed solder. Multiply that across a whole house with several bathrooms, a kitchen, and a laundry, and the joint count climbs into the hundreds. That is the labor that adds days.

The Plastics Pipe Institute describes PEX as offering "flexibility, durability, and ease of installation," and the install-speed difference is the practical result. Both materials are accepted by plumbing code, so the choice is about speed, lifespan, and cost rather than whether the work will pass. There is also a Phoenix angle on durability: the Department of Energy notes that "southern states" generally start having frozen-pipe problems near 20 degrees Fahrenheit, and because PEX can expand under ice it is more forgiving at exposed hose bibs and attic runs during a hard cold snap. For a deeper look at material trade-offs and pricing, see our page on whole-house repipe cost: PEX vs copper.

Most families can stay in the home during a repipe. The water is shut off only during active work and is usually turned back on by evening, so you have running water overnight even while the project is in progress. A crew will typically confirm with you when the supply goes off in the morning and when it comes back on each evening.

There are stretches during the day when one or more fixtures are out of service while their lines are being changed, so it helps to plan around the work zone. If a single bathroom is being repiped on a given day, the crew can often keep another bath running. On a fast PEX job the disruption is brief; on a longer copper job you live with a few more days of partial water service.

Expect noise, dust, and people moving through the house. The crew opens walls, runs tools, and tests the system, so the days are active. Clearing the area under sinks, around the water heater, and along interior walls before the crew arrives speeds up the access stage and can shave time off the schedule.

Yes. A whole-house repipe alters the water distribution system, which is permitted plumbing work. In Phoenix, that work falls under the city's Planning & Development permitting process, and the licensed plumber doing the job normally pulls the permit and coordinates the inspection. Building the inspection into the plan is why the calendar can run a day past the hands-on plumbing.

The inspection exists to confirm the new system meets code before the walls are sealed. Two code points drive what the inspector looks for. First, the system has to pass a pressure test: the International Plumbing Code requires the water distribution piping to be tested and proved tight, so the lines are charged and held before sign-off. Second, the materials and connections have to meet the code's water-supply rules in IPC Chapter 6, which lists PEX and copper among the approved options for potable water.

Because the inspector works on a city schedule, the visit may land the day after the pipe is run, not the same afternoon. A reputable plumber sequences the work so the system is ready and accessible when the inspector arrives, then closes the walls only after the work passes. Skipping the permit is a real risk: unpermitted plumbing can surface during a home sale and force rework, so the inspection day is time well spent.

Several factors push a job toward the short or the long end of these ranges. The biggest ones:

• Home size. More square footage means more linear feet of pipe and more fixture runs, which adds hours or days.
• Number of bathrooms and fixtures. Each bath, the kitchen, the laundry, and outdoor spigots is a tie-in point, and every connection is labor. A three-bath home takes longer than a one-bath home.
• Slab vs. attic access. When the old lines run through an open attic or crawlspace, the crew can reroute overhead with limited wall opening. When the original pipe is buried in a concrete slab, the common fix is to abandon the slab lines and run new pipe through the attic and down the walls, which changes the labor mix.
• Number of stories. Vertical runs between floors and extra drops into wall cavities add time on a two-story home.
• Material. PEX is the fastest; copper's soldered joints take the most time.
• Finish repair. Patch, texture, and paint are a separate trade and can extend the project past the plumbing days, especially with tile or stucco walls.

Set your expectations as a typical range, not a fixed promise. A small single-story PEX job may wrap in a day, while a large two-story copper repipe with slab routing and many bathrooms can run the better part of a week once the inspection and finish work are counted. The honest timeline comes after a plumber walks the home, confirms the existing pipe material, and checks how the lines are routed. If you are weighing whether a repipe is even due yet, our pages on the signs of old, failing pipes and on PEX vs CPVC pipe can help you sort the options before scheduling the work.