# Row Home Repiping in Philadelphia

> Row home repiping in Philadelphia: new supply lines routed inside your own party walls, from the front-wall meter to the second-floor bath, to the City code.

URL: https://philadelphiafreedomrepipe.com/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.

Last Updated: October 26, 2026

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

**80.2%** Attached share in ZIP codes 19134 and 19149, the highest in the city

**125** L&I service line permits over 36 months that name the front or foundation wall where the line enters

**47.7%** Attached share in Upper Darby Township, the highest of the inner-ring suburbs reviewed

[Philadelphia Freedom Repipe](https://philadelphiafreedomrepipe.com/) repipes rowhouses across Philadelphia and in suburbs where attached houses are common, such as Upper Darby and Norristown. A rowhouse repipe replaces the same supply pipe as any [whole-house repipe](https://philadelphiafreedomrepipe.com/whole-house-repiping/), but the house shapes almost every decision: where the water comes in, where the new pipe can climb, which walls are off limits and how much plaster has to open. It gets its own page because those decisions are different from a twin or a detached house, not because the job has a different name. Licensed and insured contractors carry out the work; inside the city, a Philadelphia licensed master plumber oversees the job and pulls the L&I permit.

## Why rowhouses get their own plan

More than half of Philadelphia’s housing units, 55.6%, are single-family attached homes: rowhouses and twins. In ZIP codes 19134 and 19149 the attached share is 80.2%, and it passes 70% in 19148, 19142, 19120, 19138, 19132, 19145 and 19140. Outside the city, attached houses make up 47.7% of Upper Darby’s housing and 47.1% of Norristown’s, both close to inner-city levels.

A rowhouse is long, narrow and shares a wall with a neighbor on one or both sides. That leaves fewer places to put pipe than in a detached house, and usually one realistic path to the upper floor. Plan that path first and the rest of the repipe follows. Get it wrong and the job opens more plaster than it needs to. Neighborhood detail is on the [North Philadelphia](https://philadelphiafreedomrepipe.com/service-areas/north-philadelphia/), [South Philadelphia](https://philadelphiafreedomrepipe.com/service-areas/south-philadelphia/) and [West and Southwest Philadelphia](https://philadelphiafreedomrepipe.com/service-areas/west-southwest-philadelphia/) pages.

## The party wall rule

Philadelphia’s plumbing code has two rules that matter more in attached housing than anywhere else. Section P-603.3 says water distribution pipe may not cross adjoining property lines, except for engineered private infrastructure. Section P-602.1.1 says each building on a street with a main shall have a separate connection to the public water main; a common pipe is allowed only on the same deeded property, after the meter, and not under a building. Both appear in L&I’s [summary of the plumbing code amendments](https://www.phila.gov/media/20240226150355/PB_022_FAQ_Summary-of-2018-Philadelphia-plumbing-code-amendments.pdf).

In practice, new supply pipe stays inside your own house. It does not run through a party wall to reach a fixture, and it does not borrow a chase that belongs to the house next door. Older rows sometimes turn up surprises: a line that enters through one basement and feeds two houses, or an abandoned pipe through the party wall that is still connected. Those are problems to fix, not routes to reuse, and fixing them usually means new service line work for one house. The guide to [who owns the water line in Philadelphia](https://philadelphiafreedomrepipe.com/guide/who-owns-the-water-line-philadelphia/) explains where the owner’s responsibility runs.

## Where the water comes in

In most Philadelphia rowhouses the service line enters through the front foundation wall to a meter and main shutoff inside, in the basement or cellar. L&I’s service line permits show it: of 2,555 issued over 36 months, 281 name the meter, 125 name the front or foundation wall and 52 the basement, with scopes written “curb to meter” or “sidewalk to front wall”.

That puts the start of every rowhouse repipe at the front of the house, often the farthest point from the kitchen and the water heater. The walk-through starts there. It records what the service line is made of where it comes through the wall, whether the main shutoff still closes, and whether the valve is a type that restricts flow even when open. An old shutoff is often replaced during the repipe, since the water is off anyway; the [main water shutoff replacement](https://philadelphiafreedomrepipe.com/main-water-shutoff-replacement/) page covers that work.

## Routing through a narrow plan

From the shutoff, new hot and cold mains run along the basement joists toward the back of the house, where the water heater and the kitchen usually sit. A rowhouse basement is long and open, which makes this the easy part. Joists usually run side to side, between the party walls, so pipe running front to back crosses them and is hung below or drilled through within the limits for notching and boring.

The layout depends on where the bathroom is. When the second-floor bathroom sits over the kitchen or close to the back wall, one riser near the kitchen can feed both floors. When the bathroom is at the front of the house, over the living room, the job needs a second vertical path, often a front closet or a chase beside the old chimney. A rowhouse with two bathrooms stacked one above the other on separate floors can share a riser; bathrooms at opposite ends cannot.

Flexible [PEX](https://philadelphiafreedomrepipe.com/pex-repiping/) suits these runs because it bends around framing and comes in long lengths, so a riser can go up a stud bay from one opening at the top with no hidden joints. A home-run manifold in the basement can feed first-floor fixtures directly, with a trunk up to the bathroom. Where the ground floor is a store or office, the code requires metal pipe for that space, and [copper repiping](https://philadelphiafreedomrepipe.com/copper-repiping/) explains that case.

## Second-floor runs and plaster

Most upstairs plumbing in a rowhouse is a bathroom, sometimes with a laundry or a second bath in the back bedroom. The run reaches it either up an interior wall or across the ceiling between floors. Plaster on wood lath is common in older rows, so openings are cut as clean rectangles at the points where a fitting, a turn or a valve must be made, not along the whole run. Tile around a tub is the hardest wall to open, so the plan tries to reach the tub 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 placed and closed.

Houses without a full basement need a different route. Mains may run in a crawl space, along a first-floor wall behind cabinets or baseboard, or in the ceiling. Each option means more openings or more insulation, and the walk-through shows which fits.

## Rear additions and cold walls

Many rowhouses have a kitchen or bathroom in a rear addition with its own foundation, sometimes over a crawl space or a slab. Pipe to those rooms crosses from the main basement into colder construction. Philadelphia averages 77.3 days a year with a low at or below freezing on NOAA’s 1991 to 2020 normals, so new pipe there stays inside insulated space where possible and is insulated where it cannot. The [winter pipes in a Philadelphia rowhouse](https://philadelphiafreedomrepipe.com/blog/winter-pipes-philadelphia-rowhouse/) post covers the cold-weather side.

## Permit, testing and price

A rowhouse repipe is a one-family alteration in Philadelphia, usually eligible for an EZ permit without plans, at $50 for the first 7 fixtures and $22.50 for each additional one. The new system is pressure tested before any wall closes, flushed after the cutover, and every shutoff is labeled. A rowhouse repipe falls within the $4,000 to $15,000+ whole-house range for the Philadelphia area; there is no separate rowhouse range, and the [repiping cost guide](https://philadelphiafreedomrepipe.com/guide/repiping-cost-philadelphia/) explains what moves the number. The [guide to living through a repipe](https://philadelphiafreedomrepipe.com/guide/living-through-a-repipe/) covers water-off windows in an occupied house.

## Related resources

- [What a Philadelphia rowhouse repipe looks like](https://philadelphiafreedomrepipe.com/blog/what-a-philadelphia-rowhouse-repipe-looks-like/), an illustrative walkthrough
- [Galvanized pipe replacement](https://philadelphiafreedomrepipe.com/galvanized-pipe-replacement/), since many rows still run on steel
- [Old water pipes in Philadelphia homes](https://philadelphiafreedomrepipe.com/guide/old-water-pipes-philadelphia-homes/)
- [Repiping in Upper Darby](https://philadelphiafreedomrepipe.com/service-areas/upper-darby/) and [repiping in Norristown](https://philadelphiafreedomrepipe.com/service-areas/norristown/)

## What's included

- A walk-through from the meter at the front wall to the top floor, with routes marked
- A check that no supply pipe crosses the party wall into a neighboring house
- New basement mains from the main shutoff to the water heater and toward the rear
- A riser to the second floor through a closet, chase or wall the house owns
- Branches to the kitchen, bathrooms, laundry and hose bibb
- Insulation where pipe passes a rear addition, enclosed porch or outside wall
- Pressure test before walls close, flush, and labeled shutoffs
- A written list of openings and who closes each one

## How the rowhouse plan changes the routing

|  | Basement rowhouse, bath over the kitchen | Basement rowhouse, bath at the front | Rowhouse with a rear addition |
| --- | --- | --- | --- |
| Basement run | Short: meter at the front, water heater and riser near the back | Short to the heater, then back toward the front for the riser | Long: mains carried past the original back wall into the addition |
| Route to the second floor | One riser near the kitchen wall feeds both floors | A separate riser through a front closet or chase | Riser in the main house; addition fed at floor level |
| Openings | Fewest; the kitchen wall often serves both | More; a second vertical path through plaster | More, and the addition floor may be over a crawl space |
| Freeze exposure | Low if the riser stays off the rear wall | Low | Higher: addition floors and walls are often colder |

## Guides for this work

- 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 [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.
- 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 [Who Owns the Water Service Line in Philadelphia?](https://philadelphiafreedomrepipe.com/guide/who-owns-the-water-line-philadelphia/)Where the Water Department's pipe ends and yours begins, from the ferrule at the main to the last fixture upstairs, and why the line is drawn differently across the city limit.

## 

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 water lines on hangers along the joists of a rowhouse basement

A rowhouse bathroom wall opened behind the toilet showing new red and blue PEX lines to shutoff valves

A water meter between two brass valves on new copper pipe along the wall of a narrow rowhouse basement

A fresh rectangular plaster patch on a rowhouse hallway wall, with a drop cloth on the floor

## Rowhouse repiping questions

### How does new pipe get to the second-floor bathroom of a rowhouse?

Through a vertical path the house owns: a closet stacked over another closet, the wall behind the kitchen sink, a chase beside the chimney or the back of a cabinet. Party walls are off limits. Flexible PEX can be fished down a stud bay from one opening at the top, which keeps plaster openings few.

### Does a rear kitchen addition change a rowhouse repipe?

Yes. The mains have to run past the original back wall into the addition, which often sits over a crawl space or slab and has colder walls and floors. That means a longer basement run, more insulation and sometimes an opening in the addition floor or wall to get the pipe to the sink.

### Can a rowhouse without a basement be repiped?

Yes, with a different route. Without basement joists to carry the mains, lines run in a crawl space, along a first-floor wall behind trim or cabinets, or in the ceiling between floors. Each of those needs more openings or more care about cold, and the walk-through shows which works for the house.

### Where is the water meter in a Philadelphia rowhouse?

Usually inside, in the basement or cellar just behind the front wall, where the service line comes in from the street. L&I service line permits are routinely written curb to meter or sidewalk to front wall. The main shutoff sits beside the meter, and that is where a repipe starts.

### Does a rowhouse repipe cost less than a detached house repipe?

Often, because a rowhouse tends to have fewer fixtures, shorter runs and fewer outside walls, but there is no separate published range. A rowhouse repipe falls within the $4,000 to $15,000+ whole-house range for the Philadelphia area. Fixture count, floors, plaster, a rear addition and patching move it within that range.

## Related services

### 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.

### 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.

### 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.