Whole-Home Repipe San Antonio: PEX vs Copper
Whole-home repipe San Antonio guide — signs you need one, PEX vs copper for hard water, permits, timeline, and cost drivers. Licensed plumber RMP46592.
Whole-home repipe in San Antonio: when to act, why PEX wins in hard-water conditions, how permits work, and what the process looks like start to finish. This guide is part of the C.S.W. Power Solutions San Antonio homeowner library. Use the related links on this page to move from research into the matching licensed service page, compare connected trade requirements, and request a written estimate when the project needs plumbing, electrical, HVAC, generator, remodeling, restoration, or general-contractor coordination.
Whole-Home Repipe San Antonio: What to Know Before You Commit
A whole-home repipe replaces every supply line in your house — from the meter to every fixture — with new pipe. For most San Antonio homeowners, the decision comes down to one question: have the leaks, the pressure drops, and the rusty water reached a point where patching individual pipes costs more than fixing the system? If the answer is yes, a repipe is typically faster, cleaner, and cheaper over the next decade than chasing failures one at a time. Our licensed San Antonio plumbing team under RMP46592 performs full repipes with permits pulled from the City of San Antonio Development Services Department.
Four Signs Your San Antonio Home Needs a Repipe
Recurring slab or wall leaks are the clearest signal. If you have had two or more pinhole leaks in a three-year window, the pipe material itself is failing, not just isolated spots. Low pressure at multiple fixtures — not just one showerhead — points to heavy mineral buildup inside the pipes blocking flow. Discolored water with a brownish or reddish tint is galvanized steel shedding rust into the supply stream; beyond the cosmetic problem, that corrosion is narrowing the pipe wall from the inside. Finally, pipe material matters: galvanized steel and polybutylene (the gray plastic used heavily in 1980s and early 1990s construction) are both past their engineering lifespan and do not have viable repair paths. If your home still has either material, a repipe is not a question of if, but when. You can also request a leak detection inspection if you suspect hidden failures before committing to the full scope.
PEX vs Copper: Which Is Right for San Antonio's Hard Water
San Antonio sits in one of the hardest water regions in Texas. Water hardness in the Edwards Aquifer range routinely runs above 200 mg/L as calcium carbonate, and that mineral load accelerates pitting corrosion in copper pipe — particularly Type M copper, the thinner-wall grade used in most residential construction. PEX (cross-linked polyethylene) does not corrode, does not pit, and does not build up mineral scale the same way metal pipe does. It also expands slightly under a freeze event rather than splitting the way copper does, which matters during the rare but damaging hard-freeze weeks San Antonio gets every few years. PEX is also easier to route through existing walls with minimal drywall cuts, which reduces repair time and finish work. Copper remains a strong choice for gas lines and some outdoor applications, but for interior supply-line repiping in a San Antonio home with hard water, PEX-A or PEX-B is what most licensed plumbers reach for today.
The Whole-Home Repipe Process and Timeline
A typical whole-home repipe on a single-story San Antonio home takes one to three days of active plumbing work. The process starts with a full walkthrough to map every supply line, fixture location, and access point. Before pipe work begins, we pull a plumbing permit with the City of San Antonio Development Services Department — this is not optional and any contractor skipping permits is leaving you with uninspected work that can create title and insurance issues later. Day one is usually rough-in: running new PEX lines through attic space or walls, connecting at the manifold or trunk lines, and capping the old pipe. Day two is connection and testing: hooking up every fixture, pressure-testing the entire system, and walking you through before we call for inspection. The City inspector closes the permit after approving the rough-in and final. Drywall patching for any access cuts is handled as part of the scope when you work with a general contractor who holds trades in-house. If an active slab leak is driving the decision, read our slab leak repair cost guide for San Antonio 2026 for more detail on how slab access decisions interact with repipe scope.
Permits and Inspections: What San Antonio Requires
San Antonio Development Services requires a plumbing permit for any whole-home repipe. The permit triggers a rough-in inspection before walls are closed and a final inspection at completion. Working without a permit is a code violation and can void homeowner's insurance coverage for water damage related to unpermitted work. Our team files the permit, schedules both inspections, and coordinates access so the process does not drag out your project timeline. The permit record also protects you at resale — a buyer's inspector will ask, and a closed permit on file answers that question cleanly.
Hard Water, CPS Energy, and Long-Term Pipe Health
San Antonio's water supply comes primarily from the Edwards Aquifer and the Guadalupe-Blanco River Authority system, both of which deliver hard, mineral-rich water. Over years, that mineral load deposits inside copper pipe, narrowing the effective flow diameter and creating the conditions for pinhole leaks. Homes on well water in the Hill Country communities like Helotes, Boerne, and Spring Branch often see even harder water with higher iron content. If you are repiping and also concerned about long-term water quality, a whole-home water softener or filter installed at the point of entry is worth discussing during the repipe scope — the access and rough-in coordination is easier to do at the same time than as a separate project later. CPS Energy does not directly regulate plumbing, but gas-line work that touches water heater supply, tankless heater installation, or generator fuel lines that run alongside supply work may require coordinated permits.
Cost Drivers for a San Antonio Whole-Home Repipe
Repipe cost ranges vary based on house size, number of bathrooms, pipe accessibility, and finish work required. A small single-story home with one bathroom costs significantly less than a two-story four-bathroom home where lines must be routed through insulated exterior walls. Other factors that affect the total: whether the old pipe is galvanized (which adds labor for corrosion at fittings), how much drywall access is needed, whether the water heater or fixtures are being replaced at the same time, and whether a manifold-style PEX layout or a trunk-and-branch layout fits the existing structure better. We provide written estimates after a site walkthrough — we do not quote repipes over the phone because the access picture matters too much to the number. Slab leak repair work, when it overlaps with a repipe decision, is quoted as part of the same assessment so you see the full picture before committing.
What Happens If You Wait
Delaying a needed repipe is not a neutral choice. Galvanized pipe under pressure does not hold its failure pattern — one pinhole repaired today does not stop the next one from opening six feet away next quarter. Each emergency repair call carries a service fee, drywall damage, and the possibility of water damage to flooring, cabinets, or insulation. More seriously, a pipe failure at a slab penetration or behind a vanity wall while a house is unoccupied can result in significant structural water damage. If you are already dealing with active leaks, the emergency plumbing line at CSW is the fastest path to stop the damage while the repipe assessment gets scheduled.
Frequently Asked Questions
How do I know if my San Antonio home needs a whole-home repipe?
The clearest signs are recurring pinhole leaks in multiple locations, low water pressure at several fixtures, brown or rusty discolored water, and pipe materials like galvanized steel or polybutylene that are past their service life. If you have had more than one leak in the past few years or your home was built before 1995 with original plumbing, a licensed plumber can inspect the system and tell you whether spot repairs or a full repipe makes more financial sense.
Is PEX or copper better for San Antonio's hard water?
For San Antonio's hard water conditions, PEX is generally the better choice for interior supply lines. San Antonio water is high in calcium and magnesium, which accelerates pitting corrosion in copper pipe over time. PEX does not corrode, handles the occasional hard-freeze event better than copper, and is easier to route through existing walls with fewer drywall cuts. Copper remains the standard for some outdoor and gas-adjacent applications.
Does a whole-home repipe in San Antonio require a permit?
Yes. The City of San Antonio Development Services Department requires a plumbing permit for a whole-home repipe. The permit includes a rough-in inspection before walls are closed and a final inspection at completion. Skipping permits can create insurance coverage issues and complications at resale. Any reputable licensed plumber will pull the permit as a standard part of the job.
How long does a whole-home repipe take in San Antonio?
Most single-story San Antonio homes can be repiped in one to two days of active plumbing work, with an additional day or two for City inspection scheduling and any drywall patching. Larger two-story homes or homes with four or more bathrooms typically run two to three days. Your water is usually restored to service the same day the new lines are connected and pressure-tested, even before the final inspection closes the permit.
C.S.W. Power Solutions is a veteran-owned, licensed general contractor serving San Antonio, TX and surrounding communities including Boerne, New Braunfels, Schertz, Stone Oak, Helotes, Alamo Ranch, Converse, Universal City, Live Oak, Leon Valley, Castle Hills, Cibolo, Seguin, and Southtown. Plumbing, electrical, HVAC, generator, EV charger, and remodeling trades all held in-house under one general-contractor license umbrella.
Call 210-504-9796, book online for a written estimate, or text photos so CSW can route plumbing, electrical, HVAC, generator, water heater, drywall, painting, restoration, or general contractor repair requests to the right crew.
Email cswpowersolutions@gmail.com. Located at 4931 Enterprise Drive, Suite 1, San Antonio, TX 78249. Business hours: Mon-Fri 7:00 AM - 6:00 PM, Sat 8:00 AM - 2:00 PM. Free written estimates within one business day.