Repiping a House: What You Need to Know

Repiping a house replaces the old plumbing system with new water, drain, or gas piping. Most homeowners want to know what to expect, what needs to be prepared before installation, how permits work, and how long the job will take.

Here is a clear breakdown of the full process from start to finish.

Before Installation Day

Areas That Need to Be Cleared

To install new piping, access openings must be made in walls and sometimes ceilings. Clearing specific areas helps the project move quickly and safely.

• Clear cabinets under sinks
• Remove items from bathroom vanities
• Clear access around water heater
• Clear garage walls where piping may run
• Provide access to crawl space entry if applicable

Furniture should be moved a few feet away from walls where plumbing fixtures are located. Fragile items should be secured.

Permits and Processing Times

Most cities require plumbing permits for full house repipes. Permit processing time depends on the city. Some municipalities issue over the counter permits the same day. Others may take a few business days.

Inspections are scheduled after installation and pressure testing. Approval is required before final patching in permitted areas.

Installation Day: What Happens

Water Shut Off

The main water supply is shut off during active installation. Temporary water can sometimes be restored at the end of the first day depending on scope.

Controlled Access Openings

Small access openings are cut in strategic locations to route new piping. The goal is minimal disruption while allowing proper installation.

Installing the New Piping

Old piping is disconnected and abandoned in place. New piping is installed through attic, crawl space, or wall cavities depending on home layout.

• Main lines are routed first
• Branch lines are connected to each fixture
• Valves and shutoffs are upgraded as needed
• All piping is secured and supported per code

Water lines are sized based on pressure, fixture demand, friction loss, and total developed length.

Pressure Testing

All new water or gas piping is pressure tested before walls are closed. This confirms there are no leaks and the system holds properly.

Completion Time

Most full house water repipes are completed in 1 to 2 days depending on size and accessibility. Larger homes or multi system projects may take longer.

Drain and gas repipes vary depending on whether trenching or slab work is required.

Patching and Restoration

After installation and inspection, access openings are professionally patched. Surfaces are left ready for paint. Work areas are cleaned before project completion.

What You Gain After Repiping

• Improved water pressure
• Reduced risk of leaks
• Updated shutoff valves
• Code compliant plumbing system

Repiping restores the plumbing system from the inside out. Proper planning, correct pipe sizing, and professional installation ensure long term performance.

For a free estimate and fast 1 to 2 day repipe service, contact SoCal Repipes.