NYC has thousands of buildings with 50–100 year old galvanized pipes. These corrode from the inside out, restricting flow and leaching rust. Full replacement pays for itself in improved water quality and pressure.
Most of the repiping on this page is work done inside a building — replacing supply and drain lines behind walls and under floors. The water line itself is different: it's the underground pipe that runs from the street main to your building, and when that line fails, the fix isn't inside the walls, it's underground.
Trenchless replacement pulls a new line through the path of the old one using a small access pit at each end, rather than digging up the full length of yard, sidewalk, or driveway between them. For older NYC properties where the underground line is original galvanized or lead pipe, trenchless is usually the less disruptive way to replace it — especially where the line runs under a driveway, sidewalk, or mature landscaping that would be costly to restore after a full trench dig.
Signs the underground water line itself may be the problem, rather than interior plumbing: low pressure that traditional pipe repair inside the building doesn't resolve, discolored water right at the point where the line enters the building, or a noticeably wet spot in the yard between the street and your foundation. A camera or pressure test on the incoming line, not just the interior plumbing, is what confirms it. This is the supply side specifically — if the issue is with the outgoing waste or sewer line instead, see our sewer line service, which covers trenchless replacement for that separate system.
For most NYC repiping jobs we recommend PEX: it's flexible enough to snake through existing walls without major demolition, resists freezing better than copper, and costs less both in materials and labor. Copper has a longer track record and is the more traditional choice — some buildings and some co-op boards specifically require it, so that's worth checking before deciding.
Neither is objectively better in every situation. PEX is generally the more practical choice for repiping an occupied building where minimizing wall damage matters. Copper is sometimes the right call for exposed runs, code requirements in a specific building, or where a board or property manager has an existing standard. We'll tell you which fits your situation rather than defaulting to one material regardless of the job.
Pre-war NYC buildings were mostly plumbed in galvanized steel, which corrodes from the inside over decades — the pipe can look intact from outside while its interior diameter has narrowed significantly, cutting water pressure long before it actually leaks. That's why chronic low pressure across an entire building, not just one fixture, is one of the strongest signs it's time for a full repipe rather than another isolated repair.
In multi-unit buildings, repiping is usually done in phases rather than shutting off water to the whole building at once — floor by floor or unit by unit, coordinated with residents and building management. Co-op and condo boards often need to review or approve larger repiping projects, particularly anything touching shared risers, so that's worth raising early rather than after work is scheduled.
A spot repair on a single accessible section is generally the fastest and least involved job. A full repipe scales with the size of the building and how many fixtures need to be reconnected — a single-family home is usually a matter of days, while a multi-unit building done in phases takes longer overall, even though no single unit is without water for more than a day or two at a time.
Access matters as much as scope. Pipes that are exposed or easy to reach cost less to replace than pipes buried behind finished walls or under slab, since more demolition and patching is involved either way. Trenchless water line work is priced by the length of line being replaced and how deep it sits, not by how much yard or driveway sits above it — which is exactly the disruption trenchless is built to avoid in the first place.
We inspect the system, identify problem areas, and recommend repair vs. full repipe honestly.
We recommend the right material — PEX for flexibility, copper for longevity — based on your building.
We work in sections, restore walls as we go, minimize daily life impact.
Full pressure test, clean worksite, full documentation, 1-year warranty.
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