What Is Whole Home Repiping?
Whole home repiping is the process of replacing all or most of the water supply lines in a house with new piping material. This typically includes the hot and cold supply lines running to every fixture in the home, bathrooms, kitchen, laundry, and any outdoor connections.
The most common materials used in modern pipe replacement are copper and PEX (cross-linked polyethylene). PEX has become the preferred choice for most residential repiping jobs due to its flexibility, freeze resistance, and ease of installation.
Repiping is not a small job, but it is often the most cost-effective long-term solution when a home’s plumbing has reached the point where repairs are happening on a regular basis.
When Tunneling Is Used in Slab Homes
Homes built on concrete slab foundations present a specific challenge during pipe replacement. When supply lines run beneath the slab, accessing them for repair or replacement requires one of two approaches: cutting through the floor from above, or tunneling beneath the foundation from outside the home.
Tunneling under the home is generally the preferred method, and here is why:
- It preserves your flooring, tile, and finished surfaces above the slab
- It avoids the dust, noise, and mess of jackhammering through concrete inside living spaces
- It gives plumbers full access to run new pipe lines without navigating finished walls or cabinets
- The tunnel can be used for future access if additional work is ever needed
The tunneling process involves digging an access tunnel beneath the perimeter of the foundation, typically from outside the home’s exterior. Plumbers then work through this space to remove old pipe and run new lines. Once the work is complete, the tunnel is filled and the exterior is restored.
Not every slab home requires tunneling. The location of the pipes, the layout of the home, and the scope of the repiping job all factor into which approach is the right call. A proper evaluation will determine what makes sense for your specific situation.
Signs You Need Pipe Replacement
- Frequent leaks appearing at different locations throughout the home
- Rusty or discolored water, particularly at the start of a faucet run
- Noticeably low water pressure throughout the house or in specific areas
- Visible corrosion, green oxidation, or flaking on exposed pipe sections
- Your home has original galvanized steel pipes from the 1970s or earlier
- You have polybutylene pipes, a material widely recalled due to failure rates
- You recently discovered a slab leak and the pipes are aging throughout
- Your homeowner’s insurance has flagged your plumbing as a coverage risk
Benefits of Whole Home Repiping
- Eliminates repeated repair calls: New pipes do not corrode, pit, or leak the way aging galvanized lines do
- Improved water quality: No more rust particles or metallic taste caused by degraded pipe interiors
- Better water pressure: Decades of mineral buildup inside old pipes restricts flow; new pipes restore full pressure
- Increased home value: Updated plumbing is a meaningful selling point, especially in older homes
- Peace of mind: One job resolves a category of problems rather than managing them one at a time
- Longer lifespan: PEX and copper pipes are rated for 50 or more years under normal conditions
The Process: How Repiping Works
- Inspection and assessment. A plumber evaluates your current pipe material, condition, and layout to determine the scope of work and the best method for access and replacement.
- Access planning. For slab homes, the plumber determines whether tunneling under the home or another access approach is appropriate. For homes with crawl spaces or basements, access is often simpler.
- Water shutoff. Water service to the home is turned off at the main. This is typically a one to two day process for a full repipe, so planning around it is important.
- Old pipe removal and new pipe installation. Plumbers remove the failing lines and run new ones through the planned access routes. PEX is run in long, flexible sections that reduce the number of joints and potential failure points.
- Connections to fixtures. New supply lines are connected to each fixture, water heater, and appliance throughout the home.
- Pressure testing. Before water service is restored, the entire new system is pressure-tested to confirm there are no leaks at any connection point.
- Restoration. Any wall openings, tunneling access, or exterior work is closed up and restored. Your home is returned to its pre-project condition.
Cost of Whole Home Repiping
Pipe replacement is a significant investment, and the cost reflects the scope of the work. Most whole home repiping projects range from $4,000 to $15,000 or more, depending on home size and complexity.
Key factors that affect total cost include:
- Square footage and number of fixtures in the home
- Pipe material chosen (PEX vs. copper)
- Whether the home is on a slab, has a crawl space, or has a basement
- Whether tunneling under the home is required and the length of tunnel needed
- Accessibility of the existing lines and complexity of the layout
- Local permit and inspection requirements
Many homeowners find that the total cost of repiping compares favorably to years of ongoing leak repairs, water damage claims, and the disruption that comes with them.
Why Hire a Professional for Repiping
Whole home repiping is not a project for weekend repairs. The scope, code compliance requirements, and consequences of mistakes make this one of the most important jobs to get right the first time.
A licensed plumber will:
- Pull the required permits and schedule inspections
- Evaluate slab conditions and determine whether tunneling is safe and appropriate
- Install pipe to code and manufacturer specifications
- Pressure-test the entire system before closing up walls or tunnels
- Identify and address any additional plumbing issues discovered during the project
Improperly installed supply lines can fail within years, and the damage from a hidden leak inside a wall or under a slab can far exceed the cost of the original job.
