How to repipe a house with pex involves draining the system, cutting out old pipes, running new pex lines, and connecting them to fixtures. This guide walks you through the entire process, from planning to final pressure testing. Whether you're tackling a DIY project or seeking a professional estimate, understanding the steps helps you make informed decisions.
Why Choose PEX for Repiping?
PEX (cross-linked polyethylene) tubing has become the go-to material for residential repiping because of its flexibility, resistance to corrosion, and ease of installation. Unlike rigid copper or CPVC, PEX can bend around corners without elbows, reducing the number of fittings and potential leak points. It also expands slightly in freezing conditions, lowering the risk of burst pipes. According to the International Association of Plumbing and Mechanical Officials (IAPMO), PEX meets modern plumbing standards and is widely accepted by local codes.
Materials and Tools Needed
Gathering the right supplies before you start will save time. Here is a checklist of what you'll need for a typical repipe:
- PEX tubing – type A, B, or C (common sizes: 1/2\" and 3/4\")
- PEX fittings – couplings, elbows, tees, and adapters
- Crimp rings or cinch clamps – depending on connection style
- Crimping tool or cinch tool – for securing rings
- Pipe cutter – for clean cuts
- Stub-out brackets – to secure piping at fixture locations
- Manifold system (optional) – simplifies routing
- Safety gear – gloves, goggles, and a dust mask
Step-by-Step Repiping Process
Follow these key stages for a successful repipe. Always consult local codes and obtain necessary permits.
| Step | Action | Important Notes |
|---|---|---|
| 1. Plan and Measure | Map out the existing plumbing layout, measure distances, and determine the PEX path. | Keep runs as straight as possible; avoid sharp bends. |
| 2. Shut Off Water and Drain | Close the main water valve, open all faucets to drain lines, and disconnect fixtures if needed. | Use leak detection tools to identify hidden water pockets. |
| 3. Remove Old Pipe | Cut out copper, galvanized, or CPVC piping using a tubing cutter. Be careful around walls. | Work in sections to avoid debris falling into the system. |
| 4. Install PEX Lines | Run PEX tubing from the water heater to each fixture. Use a manifold or trunk-and-branch layout. | Support PEX every 32 inches with hangers; avoid contact with sharp edges. |
| 5. Connect Fittings and Fixtures | Attach PEX to existing valves or new fixture shutoffs using appropriate adapters. | Use a crimp ring for Type A/B or cinch clamp for Type B/C. |
| 6. Pressure Test | Pressurize the system to 100 psi (or per local code) and check for leaks over 30 minutes. | If leaks appear, mark them and re-crimp or replace fittings. |
The EPA WaterSense program encourages efficient plumbing layouts; consider adding insulation to hot water lines to reduce heat loss.
Permits and Local Codes
Most municipalities require a permit for repiping a whole house. Contact your local building department to understand requirements. Codes often specify pipe support spacing, burial depth for exterior runs, and backflow prevention. Following IAPMO guidelines ensures your installation meets national standards. Failing to obtain proper permits can complicate insurance claims and future home sales.
When to Call a Professional
Repiping is a major project. While experienced DIYers can handle straightforward single-story homes, older structures with limited access or complex layouts often benefit from professional help. If you encounter pipe repair issues like corroded fittings or unknown materials, a licensed plumber can assess the situation. Additionally, connecting to a new water heater repair or upgrading components may require specialized knowledge. Professional plumbers have the tools and expertise to complete the job efficiently and safely.
Cost of Repiping a House with PEX
The cost to repipe a house with PEX varies widely. Typical US ranges fall between $2,000 and $15,000 for an average home, but prices vary by region, home size, labor rates, and accessibility. Material costs for PEX are generally lower than copper, but you may need additional fittings, manifold systems, or drywall repair. For a custom estimate, reach out to a local plumber.
Frequently Asked Questions
We've compiled common questions about repiping with PEX below.
How long does PEX last in a house?
PEX is rated for a service life of 50+ years when installed correctly. The U.S. Department of Energy notes that PEX resists corrosion and scale buildup better than metal pipes.
Can I repipe one room at a time?
Yes, partial repipes are possible, but you must ensure compatibility with remaining pipes. Mixing metals can cause galvanic corrosion without proper dielectric unions.
Does PEX affect water pressure?
PEX typically maintains water pressure comparable to copper. Because it bends easily, you can avoid restrictive fittings that might reduce flow. Always size the tubing correctly (1/2\" for branch lines, 3/4\" for mains).
Do I need to use a manifold?
Manifolds simplify routing and allow independent shutoffs for each fixture, but they are optional. A trunk-and-branch layout is also code-compliant and may be cheaper for small homes.
Is PEX safe for drinking water?
Yes. PEX tubing is certified under NSF/ANSI 61 for potable water. The CDC Healthy Water site confirms that properly installed PEX does not leach harmful chemicals into drinking water.
Can I bury PEX underground?
PEX can be buried, but it must be rated for underground use (typically with a UV-resistant jacket). Follow local building codes regarding burial depth and sleeving.
Ready to repipe your home? Contact MyTownPlumber for a professional estimate. Get your plumbing offer today.
Article by MyTownPlumber Editorial Team