Repiping & Whole-Home Pipe Replacement in Altadena, CA

Repiping is the wholesale replacement of a home's water supply lines, drain lines, or both. It's a one-time fix for systems that have aged past the point where ongoing repair makes sense. Most Altadena repipe work targets two specific situations: failing galvanized supply lines in early 1900s craftsman bungalows and post-war homes built before 1960, and aging cast iron drain lines in homes built before 1970. Both materials had design lives shorter than the time they've already been in service, and both fail in ways that turn into expensive recurring problems if not addressed.

IMAGE: Repipe work in progress with PEX lines

When repiping is the right call for Altadena homes

Altadena's housing stock concentrates several housing types and eras that share specific pipe-failure patterns.

Early 1900s craftsman bungalows with original galvanized

The Mariposa Street craftsmans, the Lincoln Avenue cottages, the original Janes Village bungalows from the early 1900s through the 1920s often still have their original galvanized steel water supply pipes. Galvanized was the standard residential material for almost 60 years. The zinc coating protects the steel for 40-60 years, after which the zinc is depleted and the steel rusts from the inside out. Lines installed in 1925 are well past 100 years old. They're narrowing from rust deposits, reducing flow, releasing rust into the hot water, and starting to fail at fittings.

Post-war bungalows and tract homes

The neighborhoods built out from the late 1940s through the 1950s — including the Meadows, large portions of east and west Altadena, and adjacent SGV expansion — typically have either galvanized (in the earlier waves) or original copper that's now 65-75 years old. Galvanized in this vintage is failing for the same reasons as the earlier homes. Original 1950s copper is approaching end-of-life and showing pinhole failures in some cases, particularly hot water lines.

Cast iron drain lines

Cast iron was the dominant residential drain material from the 1930s through the 1970s. Cast iron corrodes from the inside out, develops channelization (wear along the flow line), and eventually develops holes that release wastewater into wall cavities and crawlspaces. A 70-year-old cast iron drain stack in an Altadena two-story home is often at or past the point of needing replacement.

Polybutylene supply lines

Polybutylene gray plastic supply lines installed in some homes between 1978 and 1995 are known to fail unpredictably. Anyone with polybutylene in an Altadena home should plan for repipe; insurance increasingly excludes coverage for polybutylene-related damage.

Materials we use for repipe

PEX (cross-linked polyethylene)

PEX is the dominant residential repipe material today. It's flexible (which means fewer fittings and easier routing through complicated craftsman and bungalow framing), freeze-resistant, less prone to scale buildup, and significantly less expensive to install than copper. Modern PEX-A and PEX-B carry 25-year warranties from major manufacturers. We use color-coded red (hot) and blue (cold) PEX for clear identification.

Type L copper

Copper remains an excellent choice for repipe, especially in homes where exposed runs (in mechanical rooms, basements, or under-house crawlspaces) will be visible. Type L copper has a 100+ year track record in California. We use it where the application calls for it, including some historic homes where preservation of period appropriate materials is part of the project brief.

PVC and ABS for drain replacement

For cast iron drain replacement, we use either PVC or ABS depending on the inspector's preference and the specific application. Both materials outlast the cast iron they replace and resist corrosion entirely.

Our repipe process

Repipe work follows a structured sequence designed to minimize disruption.

Day 1: Setup and rough. We protect floors and furniture, locate the optimal pipe routes through wall cavities and ceilings to minimize wall openings, make access openings, and start running new pipe. By end of day we typically have main lines roughed in.

Days 2-3: Branch runs and tie-ins. Branch lines to each fixture get routed and connected. The new system gets tied into the existing fixtures one at a time so water service can be restored at the end of each day.

Day 3-4: Pressure testing and inspection. The new system is pressure-tested to verify no leaks. We call for LA County or municipal inspection. Inspector verifies materials, sizing, slope (for drains), and pressure test results.

Day 4-5: Insulation and close-up. Pipes get insulated where required. Wall openings are prepared for drywall patching by your finish contractor (we coordinate but don't typically handle drywall finishing).

Total elapsed time for a typical 2-bath Altadena home: 3-5 working days for plumbing, plus 2-3 days of finishing work for drywall and paint, which we coordinate but typically subcontract or hand off to homeowner-selected finishers.

IMAGE: Old galvanized pipe being removed and new PEX installed

Cost of repipe in Altadena

Price depends on home size, number of bathrooms, accessibility of wall and ceiling cavities, complexity of the existing layout, and material choice. We give a firm quote after walking the property and reviewing the existing system.

Other related work we handle

Beyond core repipe, we install new pressure regulators when system pressure issues are part of the picture, install water hammer arrestors at quick-closing fixtures, integrate water softeners and filtration systems during repipe (often a good time to add them), upgrade undersized supply lines from the street to the meter when service is limited, and handle the gas line modifications that often accompany major plumbing work. For California plumbing code reference, see the California Building Standards Commission.

Frequently asked questions