# Whole-House Repiping in Philadelphia

> Whole-house repiping in Philadelphia and nearby suburbs: every hot and cold supply line replaced to the City code, pressure tested before walls close.

URL: https://philadelphiafreedomrepipe.com/whole-house-repiping/

Every hot and cold supply line from the main shutoff to the fixtures, replaced in the material the Philadelphia code allows for the building and pressure tested before the walls close.

Last Updated: October 26, 2026

**$50** L&I plumbing permit for alterations in a one- or two-family dwelling, first 7 fixtures; $22.50 for each one after that

**55.6%** Share of Philadelphia housing units that are single-family attached homes: rowhouses and twins, by Census figures

**4 ft** Minimum developed length of copper or similar metallic pipe at a water heater's inlet and outlet under Philadelphia's EZ permit standards

**39.9%** Share of Philadelphia housing units built in 1939 or earlier

[Philadelphia Freedom Repipe](https://philadelphiafreedomrepipe.com/) replaces the water supply piping in Philadelphia rowhouses, twins and detached houses, and in nearby Delaware, Montgomery and Bucks County suburbs. A whole-house repipe takes every hot and cold line out of service from the main shutoff to the fixtures and replaces it in the material the code allows for the building. Inside the city, a licensed master plumber oversees the work and pulls the L&I permit, and the job is planned around the plaster, the people living in the house and the inspection.

The case for replacing all of it at once is practical. Galvanized steel corrodes from the inside along its whole length, so a leak or a weak shower in one spot says something about the rest. Fixing one section at a time keeps old pipe in service next to new, with more cutovers and more openings over the years. If the trouble is confined to one bathroom group or one riser, a [partial repipe](https://philadelphiafreedomrepipe.com/partial-repiping/) can be the better scope, and the [Philadelphia repipe cost guide](https://philadelphiafreedomrepipe.com/guide/repiping-cost-philadelphia/) shows how the two compare.

## What happens on the first visit

The first visit follows the water from where it enters the house. In a Philadelphia rowhouse the service line often comes through the front foundation wall to a meter and main shutoff inside the house; L&I service line permits are routinely written “curb to meter” or “sidewalk to front wall”. Whoever walks the house notes what that service line is made of, because a lead or galvanized service line can be the real limit on flow, and replacing it is a separate project covered on the [lead service line replacement](https://philadelphiafreedomrepipe.com/lead-service-line-replacement/) page.

From the meter, the walk-through traces the main to the water heater and up to each floor. It records what the pipe is on every level, where earlier repairs already switched sections to copper or PEX, and how many fixtures each branch feeds. Static pressure is read at a hose bibb or test point, and flow is compared at the lowest and highest fixtures with two taps open. Those numbers separate a house where old pipe chokes the flow from one where a half-closed valve, the service line or the fixtures are to blame.

The visit also maps routes: open basement joists, closets stacked above one another, the back of a kitchen cabinet, a chase beside the chimney. It ends with a written scope that names what gets replaced, where walls would open and what stays. Drains, vents and the sewer lateral stay out of a supply repipe unless the quote names them; the guide to [whether repiping includes drains](https://philadelphiafreedomrepipe.com/guide/does-repiping-include-drains/) shows where that line falls.

## Why supply pipe gives out in Philadelphia houses

Philadelphia’s housing is old. By Census figures, 39.9% of the city’s housing units were built in 1939 or earlier, 64.9% before 1960, and the median year built is 1949. In inner ZIP codes such as 19134 the pre-1940 share passes 70%. Houses of that age were plumbed with galvanized steel or have had decades of patch repairs in mixed materials.

Galvanized pipe fails from the inside. The zinc coating wears through, the steel rusts, and scale builds on the pipe wall, so the bore narrows year by year while the outside can still look sound. The first sign is often flow, not a leak: the second-floor shower fades when the kitchen tap opens, or the first draw after a weekend away runs brown. Threaded joints are the weak point because the threads cut away part of the wall, so a joint inside a ceiling rusts through before the straight run beside it. Turning one corroded fitting to make a repair can crack the next one, which is how a small fix turns into a conversation about the whole system. The Philadelphia Water Department also notes that, over decades, lead from a property’s plumbing can collect on the corroded walls of galvanized pipe, one more reason owners look at replacing it rather than patching it. The [guide to old water pipes in Philadelphia homes](https://philadelphiafreedomrepipe.com/guide/old-water-pipes-philadelphia-homes/) goes deeper into telling the materials apart.

Copper is not immune, and water chemistry is part of the reason. PWD’s tap water runs moderately hard to hard depending on the treatment plant: about 6 grains per gallon from the Baxter plant on the Delaware and 9 to 10 grains from the Schuylkill plants. PWD adds zinc orthophosphate to form a protective coating inside pipes, which helps both copper and old steel, but it does not make any pipe last forever. Pinhole leaks in copper can come from chemistry, water velocity or how the original joints were made.

None of these symptoms proves the cause on its own. Low pressure can come from the pipe, the service line, the main shutoff or a pressure-reducing valve, and brown water can come from the water heater or work on the street main. That is why a repipe is never sold here as a guaranteed pressure fix, and why the first visit measures before anyone describes a result.

## Routing new pipe through a rowhouse

More than half of Philadelphia’s housing units, 55.6%, are single-family attached homes, and in ZIP codes such as 19134, 19148 and 19149 the share passes 77%. A rowhouse has party walls on both sides, so new pipe can only rise through the house’s own interior walls, closets and chases. That, and where the bathrooms sit relative to the kitchen, decides the layout.

Where there is a basement, its joists carry the new hot and cold mains from the shutoff to the water heater and toward the back of the house. From there, one of two layouts takes over. A trunk-and-branch layout runs larger mains with smaller branches teed off to each fixture group, which keeps the pipe count low through tight floor framing. A home-run manifold layout gives each fixture its own line from a central manifold with its own shutoff, which makes service easier later but needs more lines up through the walls. The two can be combined: a manifold in the basement for the first-floor fixtures and a trunk up to the second-floor bathroom.

The Philadelphia code adds a rule that matters in attached housing: water distribution pipe may not cross adjoining property lines, and each building on a street with a main needs its own connection. New pipe stays inside your own walls, and a line found running through the party wall to the neighbor is a problem to resolve, not a route to reuse. The [rowhouse repiping](https://philadelphiafreedomrepipe.com/rowhouse-repiping/) page covers attached-house layouts in more detail.

Where walls are plaster on wood lath, openings are cut as clean rectangles at the points where a fitting or a turn has to be made, rather than along the whole run. Tile around a shower is the hardest wall to open, so the plan tries to reach a shower valve from a closet or the room behind it. The [guide to repiping plaster walls](https://philadelphiafreedomrepipe.com/guide/repiping-plaster-walls/) explains how openings are planned and closed.

Winter shapes the routing too. Philadelphia averages 77.3 days a year with a low at or below freezing, by NOAA’s 1991 to 2020 normals. Lines to a rear addition or an enclosed porch can cross cold floor framing, so the new route stays inside heated space where it can, away from outside walls, and is insulated where it cannot. New material alone does not remove freeze exposure.

## PEX, copper and the Philadelphia material rule

The Philadelphia Plumbing Code, amended effective April 1, 2024, allows nonmetallic water piping such as PEX in one- and two-family dwellings and apartments. Section P-605.4 requires metallic piping for any water supply piping that serves or sits within any other occupancy, and P-605.4.1 requires metallic piping where an occupied floor is more than 75 feet above fire-access level. In practice, a rowhouse or twin can be repiped in PEX or copper, while a corner property with a store on the ground floor needs copper or another metallic pipe for the commercial space.

L&I’s own permit records show which way houses go. Of 52 whole-house or explicit water piping replacements permitted from October 26, 2023 to October 25, 2026, 32 named PEX and one named copper. Neither material is the right answer for every house. PEX bends around framing with fewer fittings and can be fished through plaster cavities with fewer openings. Copper is rigid, metallic, and required where the code calls for metal. The [guide to whether PEX is allowed in Philadelphia](https://philadelphiafreedomrepipe.com/guide/is-pex-allowed-in-philadelphia/) and the [PEX repiping](https://philadelphiafreedomrepipe.com/pex-repiping/) page cover the choice in full.

A few details apply whichever pipe is chosen. Philadelphia’s EZ permit standards call for at least 4 feet of copper or similar metallic pipe at the water heater’s inlet and outlet, so a PEX system meets the heater through a metal section. Where a pressure-reducing valve, check valve or backflow assembly sits on the incoming supply, thermal expansion control is required. Press-connect and push-fit joints are allowed above ground only, and flexible water connectors are allowed only in one- and two-family dwellings and apartments, where they stay accessible. In the suburbs, townships enforce the statewide Pennsylvania Uniform Construction Code, which adopted the 2021 International Plumbing Code effective January 1, 2026.

## Pressure testing, flushing and closing the walls

Before any wall or ceiling is closed, the new piping is pressure tested with the fixtures isolated, so a weak joint shows on a gauge rather than behind new plaster. After the cutover from old pipe to new, the lines are flushed to clear debris, and aerators and fixture screens are cleaned, because scale knocked loose from old valves can travel to the first faucet downstream. Shutoffs at the main and at each fixture group are labeled. Only then do the openings close, to the finish the quote names: rough patch, finished plaster or drywall, and paint are three different scopes.

## Permit, inspection and paying for the work

Replacement plumbing in Philadelphia needs an L&I permit; only minor same-material repairs and stopping a leak are exempt. A repipe in a building with four or fewer dwellings and up to four stories can usually go through the EZ permit without plans. For a one- or two-family dwelling, L&I lists the alteration fee at $50 for the first 7 fixtures and $22.50 for each one after that, plus a $100 filing fee applied toward the final fee and small city and state surcharges. A Philadelphia licensed master plumber has to oversee the work. The [Philadelphia repipe permit guide](https://philadelphiafreedomrepipe.com/guide/philadelphia-repipe-permit/) walks through the application and the inspection.

On price, a whole-house repipe of a single-family house or rowhouse typically runs $4,000 to $15,000+ around Philadelphia, and larger homes and copper jobs can pass $20,000. No City, state or federal program was found that pays for an interior repipe. PWD’s HELP loan and its free replacement programs are built around service line and exterior plumbing defects, not an interior repipe, so the owner pays for the piping inside. Planning the two together still helps, because a new service line decides where the main shutoff sits and what the new interior pipe connects to. The [repipe cost estimator](https://philadelphiafreedomrepipe.com/tools/repipe-cost-estimator/) works from the same published ranges.

## Related resources

- [How much repiping costs in Philadelphia](https://philadelphiafreedomrepipe.com/guide/repiping-cost-philadelphia/), with the factors that move a quote
- [Living through a repipe](https://philadelphiafreedomrepipe.com/guide/living-through-a-repipe/): water-off windows, dust and access
- [Galvanized pipe replacement](https://philadelphiafreedomrepipe.com/galvanized-pipe-replacement/) when steel is the main problem
- [Who can do plumbing work in Philadelphia](https://philadelphiafreedomrepipe.com/guide/who-can-do-plumbing-work-philadelphia/) and what the master plumber license requires
- [Do I need a repipe?](https://philadelphiafreedomrepipe.com/tools/do-i-need-a-repipe/), a short check of the signs

## What's included

- Hot and cold distribution piping from the main shutoff to every fixture connection
- Connections at the water heater, with the metallic section the Philadelphia code requires
- Kitchen, bathroom, laundry and hose bibb connections the piping serves
- New shutoff valves at each fixture group, labeled
- A listed transition anywhere new pipe meets pipe that stays
- The L&I plumbing permit, pulled by a licensed master plumber, and its inspection
- Pressure test before walls close, then a full flush after cutover
- A written list of wall and ceiling openings and who closes each one

## How a whole-house repipe changes by building type

|  | Single-family rowhouse | Twin or detached house | Mixed-use corner property |
| --- | --- | --- | --- |
| What the repipe covers | Main from the shutoff where the service enters, the basement trunk, a riser to the upstairs bathroom and the kitchen branch | The same, plus longer runs to fixtures on outside walls and any rear addition | The commercial space and the dwelling above, often on separate branches from the same main |
| Pipe material | PEX or copper; the Philadelphia code allows nonmetallic pipe in one- and two-family dwellings | PEX or copper, the same rule | Metallic pipe for anything supplying or running through the commercial space; confirm the apartment side with L&I |
| Routing limits | Party walls on both sides; pipe may not cross into the house next door | One party wall on a twin, none on a detached house, so more exterior wall to keep pipe away from | Store ceilings, fixtures and business hours set where and when walls open |
| L&I permit fee | $50 for the first 7 fixtures, $22.50 each after | $50 for the first 7 fixtures, $22.50 each after | Other-occupancy column: $189 for the first 7 fixtures, $22.50 each after |
| Typical cost | Within the $4,000 to $15,000+ area range | Within the same range; more floors and fixtures push it up | No published range; priced from the scope after a walk-through |

## Guides for this work

- Cost Guide [How Much Does Repiping Cost in Philadelphia?](https://philadelphiafreedomrepipe.com/guide/repiping-cost-philadelphia/)Typical ranges for a whole-house and a PEX repipe, what sits inside the price, the City's permit fees, and why two quotes for the same rowhouse can differ.
- Learn [What Old Water Pipes Are in Philadelphia Homes, and When Do They Need Replacing?](https://philadelphiafreedomrepipe.com/guide/old-water-pipes-philadelphia-homes/)A plain guide to the water pipes inside an older Philadelphia rowhouse or twin: how to tell lead, galvanized steel, copper and plastic apart, how each one fails, who owns which part, what the city's code and permits require, and how to decide between a repair, a partial repipe and a whole-house repipe.
- Learn [How Do You Repipe a House With Plaster Walls?](https://philadelphiafreedomrepipe.com/guide/repiping-plaster-walls/)Plaster on lath can be opened and closed cleanly if the openings are planned. Where the cuts go, how routing keeps them few, the three levels of patching, and what keeps the dust in one room.
- Learn [How Long Does a Repipe Take When You Are Living in the House?](https://philadelphiafreedomrepipe.com/guide/living-through-a-repipe/)The schedule depends on floors, fixtures, access and the plaster, not on a standard number of days. How the work is staged so the water is off only at cutovers, and what to get ready before the first day.
- Learn [Do You Need a Permit to Repipe a House in Philadelphia?](https://philadelphiafreedomrepipe.com/guide/philadelphia-repipe-permit/)How the L&I plumbing permit works for a repipe in Philadelphia: when one is needed, who can apply, what the EZ permit covers, the published fee lines and surcharges, and what happens at inspection.
- Learn [Is PEX Allowed in Philadelphia?](https://philadelphiafreedomrepipe.com/guide/is-pex-allowed-in-philadelphia/)What the Philadelphia Plumbing Code says about PEX water pipe: where it is allowed, where metal is required, the rules at the water heater and the fittings, the pending code bill, and how the suburbs differ.

## 

1. First call You describe the house: rowhouse, twin or detached, how many floors and bathrooms, what the pipe looks like where you can see it, and what made you call. That sets up the walk-through.
2. Assessment The walk-through starts at the meter and main shutoff, traces the pipe up every floor, checks pressure and flow, and maps the routes and the openings. You get a written scope that says what is replaced and what stays.
3. The work A licensed master plumber pulls the L&I permit. New lines go in while the old ones keep the house running, then each section is cut over during a planned water-off window.
4. Completion The new piping is pressure tested and inspected, then flushed. Shutoffs are labeled, openings are closed to the finish the quote names, and you get a list of anything old that stayed in service.

## What this work looks like

New copper trunk lines and branches on hangers along the joists of a whitewashed rowhouse basement

A closet wall opened to the studs with new red and blue PEX lines rising through the framing

A pressure test gauge on a brass fitting on a new copper water line in a basement

Separate hot and cold brass PEX manifolds on a plywood board with red and blue lines

Before

After

## Whole-house repiping questions

### What does a whole-house repipe replace in a Philadelphia rowhouse?

The pressurized hot and cold water piping from the main shutoff to each fixture: the basement main, the trunk lines, the riser to the upstairs bathroom and the branches to every sink, tub, toilet, laundry hookup and hose bibb. Drains, vents, the sewer lateral and the service line from the street are separate work, and the quote should say so.

### Does a building with a shop on the ground floor need copper pipe?

For the commercial part, yes. Philadelphia's code section P-605.4 requires metallic water piping for anything supplying or located within an occupancy other than a one- or two-family dwelling or apartment. Approved L&I scopes for mixed-use buildings spell it out as all supply piping for the commercial space being metallic. Ask L&I how the apartment side is treated before materials are ordered.

### Can the old galvanized pipe stay inside the walls after a repipe?

Often, yes. Old pipe that cannot be pulled out without opening more plaster is cut, capped and abandoned in place, disconnected from the water supply. Exposed basement pipe is usually removed. The quote should say which runs come out and which stay in the walls, so a future owner or plumber is not misled by pipe that looks live.

### Can a whole-house repipe be done one floor at a time?

Yes. The work can be staged floor by floor, with old and new piping joined at temporary transitions until the last section is cut over. Each stage is still pressure tested, and the permit covers the whole scope. Staging adds cutovers and can lengthen the job, so ask how it changes the schedule and the price before agreeing to it.

### Who carries out a whole-house repipe in Philadelphia?

Philadelphia Freedom Repipe offers and manages the work, and licensed and insured contractors carry it out. Inside the city, a Philadelphia licensed master plumber oversees the job and pulls the L&I permit. In Montgomery, Delaware and Bucks County townships, each municipality's own contractor registration and permit rules apply, and the quote should name who holds the permit.

## Related services

### Galvanized pipe replacement

Corroded steel water lines taken out of service, replaced in PEX or copper, joined to anything that stays with a listed transition, then flushed so loosened scale does not end up in the faucets.

### PEX repiping

Flexible PEX supply lines run through a house's own walls and joists, in the occupancies where Philadelphia's code allows plastic water pipe, with metal where the code requires it.

### Rowhouse repiping

A repipe planned around the rowhouse itself: a service through the front wall, a long narrow basement, party walls on both sides and a bathroom one floor up.