Multi-family and apartment repiping
Repiping an apartment or multi-family building is as much about planning as plumbing, because the work has to happen around tenants and shared walls. The right contractor phases it to keep water on and disruption down. Call now to connect with a contractor experienced with multi-family repiping.
Why multi-family repiping is its own challenge
The plumbing in an apartment or condo building fails for the same reasons a house does: galvanized steel corrodes, old copper develops pinhole leaks, and polybutylene grows brittle. What makes a multi-family repipe different is everything around the pipe. Units are occupied, walls and risers are shared between units, and a leak in one unit can damage the one below. The work has to be scheduled, communicated, and phased so residents keep water and the building keeps running.
A contractor who does multi-family work plans the job around those realities, rather than treating a building like a large single-family home.
What a building owner weighs
- Keeping units occupied and water on during the work
- Access to shared risers and interior walls
- Phasing the job building by building or stack by stack
- Clear notice and coordination with residents
- Permitting and inspection for the whole project
- Matching the material to the building and the water
Phasing the work to keep a building running
The goal is a repiped building with the least disruption to residents.
A well-run multi-family repipe is phased. The contractor often works one stack of stacked units or one building of a complex at a time, replacing the risers and the branch lines to each unit, with water shut off only in short, scheduled windows that residents are told about in advance. Access is planned to limit how much of each unit is opened, and finishes are protected and patched. Phasing lets a large building be repiped over a planned schedule without emptying it. The specifics depend on the building's layout and how the plumbing is stacked, which a contractor assesses up front.
Material choices for a building
As with a house, the new pipe is usually PEX or copper, and the choice depends on the building, the water, and the budget. PEX installs with fewer joints and less wall opening, which is a real advantage in occupied units, and it absorbs movement and freeze well. Copper has the long track record some owners prefer. For a large building, the labor savings and lighter disruption of PEX often weigh heavily, but a contractor recommends the material after seeing the building. Read more on PEX repiping and copper repiping.
Why owners repipe before they have to
In a multi-unit building, one failing pipe can damage several units at once.
The risk
- Water damage and freezing claims average about $13,954 each (Insurance Information Institute).
- About 1 in 60 insured homes files a water or freezing claim each year (Triple-I).
The fix
Replacing a building's aging supply system on a planned schedule costs less and causes far less disruption than a burst riser flooding multiple units. A repipe resets the whole building and ends the stream of in-unit leak calls.
Related services
This page covers the pressurized water supply. For the drain, waste, and vent side of a building, see multi-family DWV repipe. For offices, retail, and other non-residential buildings, see commercial repiping. The specific materials being replaced are covered on galvanized, polybutylene, and copper pages. A contractor can assess the building and lay out a phased plan.
Communication is half the job
In a multi-family repipe, the plumbing is only part of the work; the other part is keeping residents informed. A well-run project gives tenants clear written notice ahead of any shutoff, posts the schedule so people know when water will be off in their unit, and coordinates access so a crew is not knocking on a locked door. Good contractors treat resident communication as a core part of the job rather than an afterthought, because a building full of people whose water is interrupted without warning becomes a building full of complaints to the owner. The smoothest projects are the ones where every resident knows what is happening and when. A contractor experienced in multi-family work brings that process with them, which is one of the main reasons to choose someone who does this kind of building regularly rather than a contractor who only works single-family homes.
A planned repipe versus a stream of emergency calls
For an owner, the choice is rarely repipe or nothing; it is repipe now or keep paying for failures.
A building on aging supply pipe does not fail all at once. It fails one leak at a time, each one an emergency call, a water shutoff, a damaged unit, and often a frustrated tenant. Those costs add up quietly, and they come at the worst moments rather than on a schedule. Water damage and freezing claims average about $13,954 each, according to the Insurance Information Institute, and in a stacked building a single failed riser can damage several units before the water is off. A planned repipe trades that unpredictable stream of failures for one scheduled project, done on the owner's timeline with the building kept occupied. It also resets the asset: a repiped building is easier to insure, easier to sell, and no longer generating the in-unit leak calls that wear on tenants and management alike. A contractor can assess the building and lay out what a phased plan would look like.
Aging pipe across a whole building?
Multi-family repiping needs a contractor who can phase the work around tenants. Talk it through with one who does this kind of job. Call now.
Common questions
Do tenants have to move out during a repipe?
Usually not. A multi-family repipe is phased so water is off only in short, scheduled windows, and the crew works unit by unit or stack by stack. Residents are given notice. A contractor plans the phasing to keep the building occupied.
How is a building repipe scheduled?
The contractor typically works one stack or one building at a time, replacing risers and branch lines on a planned schedule with clear resident notice. The phasing depends on how the plumbing is stacked, which the contractor assesses up front.
What pipe is used in a multi-family repipe?
Usually PEX or copper. PEX installs with fewer joints and less wall opening, which helps in occupied units, while copper has a long track record. A contractor recommends the material after seeing the building and the water.