# Plumbing Riser Replacement in Chicago

> Plumbing riser replacement in Chicago condos and apartments: risers vs unit branches, the riser drawing, association letter and phased shutoffs. Ask for a plan.

URL: https://chicagolakerepiping.com/riser-replacement/

Plumbing riser replacement in condo and apartment buildings, stack by stack in copper, with each unit's tie-in, the association's approval and the City permit planned before the first shutoff.

Last Updated: October 25, 2026

**286** City of Chicago Express plumbing permits since October 2023 that include replacing risers in existing chases

**+$150** Added to the Express plumbing permit for each dwelling unit a replaced riser serves

**27.0%** Share of Chicago housing units in buildings of 20 or more units, by the American Community Survey

**1 letter** A signed condominium association approval, required for Express permit work on condo property

In a condo or apartment building, the water that reaches a kitchen on the eighth floor climbs there through risers: vertical hot and cold pipes that run up a chase and feed every unit stacked along them. [Chicago Lake Repiping](https://chicagolakerepiping.com/) offers and manages plumbing riser replacement in Chicago condo and apartment buildings, with licensed and insured plumbing contractors holding the City of Chicago plumbing license doing the work. A riser job is planned around the whole stack, the association or owner who controls it, and the residents who lose water while it is cut over.

The building stock makes this a city-scale question. By the American Community Survey, 16.2% of Chicago’s housing units are in buildings of 5 to 19 units and 27.0% in buildings of 20 or more. The City’s own permit records show riser work happening: since the Express Permit Program launched in late 2023, 286 plumbing permits include repair or replacement of risers in existing chases, and earlier free-text permits describe projects such as a galvanized-to-copper replacement of thirty 30-story water risers on the Near North Side in 2023 and a 2025 riser replacement serving 143 residential units.

## What happens on the first visit

A riser survey starts at the meter and main shutoff, where the building’s water enters, and follows the main to the base of each stack. It records what each riser is made of, its size, where the shutoff valves at its base are and whether they still close. From there it goes up: which units each stack feeds, where the chase can be reached from inside a unit or a corridor, and where earlier repairs already put copper into a run of galvanized.

Static pressure is read at a test point near the base, and flow is compared at the lowest and highest fixtures on the same stack. A top-floor unit with weak flow while the second floor is fine points up the riser; weak flow across the building points back to the main, a pressure-reducing valve or a booster system. The visit ends with a stack-by-stack scope and the openings each unit would see.

## Risers versus the piping in a unit

The distinction matters because it decides who owns the decision and what a repair can achieve. The branch piping inside a unit leaves the riser at a tie-in and runs to that unit’s sinks, tub, toilet and appliances. Replacing it is a unit project: a [partial repipe](https://chicagolakerepiping.com/partial-repiping/) of one apartment, still subject to the association’s letter in a condo. It does nothing for the riser it hangs from.

The riser itself serves every unit on the stack. If it is corroded galvanized steel, every household on that stack shares the restriction and the leak risk, and new copper branches in one unit still draw from the old pipe behind the wall. Unit owners ask whether they can replace the galvanized under one sink along with the valves and the faucet. They can, as a branch repair, but where the riser is the problem the fix is a stack project.

## Why risers give out

Galvanized steel risers corrode from the inside. The zinc coating wears through, the steel rusts, and scale narrows the bore year by year. Threaded joints fail first because cutting the threads removes part of the pipe wall. In a riser, those joints sit inside a chase between floors, so a failure can show up as a stain on a ceiling one unit below the leak. The [galvanized pipes guide](https://chicagolakerepiping.com/guide/galvanized-pipes-chicago-homes/) explains the corrosion in detail.

Hot water risers can show it first, since warm water speeds corrosion. Copper risers are not immune either: water chemistry, velocity and the way the original joints were made all affect them, and the [copper pinhole leaks guide](https://chicagolakerepiping.com/guide/copper-pinhole-leaks/) covers those mechanisms. None of these signs proves a cause on its own, which is why the survey reads pressure and flow before anyone prices new pipe.

## The full-riser drawing and the association letter

The City of Chicago’s Express Permit Program covers repairing or replacing existing risers inside a building, and it asks for two documents that a unit-level job does not. Riser work needs a plumbing contractor’s drawing of the entire riser, as a two-dimensional or isometric diagram showing its size and material. Work on condominium property, including inside an individually owned unit, needs an approval letter signed by someone authorized to sign for the association.

Those documents shape the project. The drawing forces the stack to be surveyed top to bottom before the application goes in, and the letter means the board has agreed to the scope. Homeowners report that condo managers ask for a certificate of insurance and the plumber’s license before anyone enters a unit, and that those requirements push up the minimums on small condo plumbing jobs. A riser program spreads that overhead across the whole stack.

## Phasing a riser program in an occupied building

A building-wide program runs one stack at a time, so the rest of the building keeps running on its existing piping. Water is off only while a stack is cut over from old risers to new, and only the units on that stack are affected. The association or manager gets the schedule of water-off windows by stack, in writing, to send to residents before the first shutoff. The [guide to living through a repipe](https://chicagolakerepiping.com/guide/living-through-a-repipe/) lists what residents can ask about dust, access and water-off time.

Each unit on the stack needs access days for the openings and the tie-in. Chases are reached from the side that does the least damage: a closet, the back of a kitchen cabinet or a corridor wall where one is available. Plaster is cut in clean rectangles at fittings and turns, and tile walls are reached from the back where possible; the [plaster walls guide](https://chicagolakerepiping.com/guide/repiping-plaster-walls/) covers how openings are planned and closed. The Express permit does not allow new or enlarged openings through the walls and floors separating units, corridors or stairways, and it requires firestopping where new pipe passes existing openings, so a riser stays in its existing chase. Each stack is pressure tested before its chase closes, then flushed after cutover, with aerators and screens cleaned, because scale from old valves travels to the first faucet downstream.

## Copper, sizing and pressure in taller buildings

Inside the City of Chicago, new risers are copper. Table 18-29-605.5 of the Chicago Plumbing Code lists copper and copper-alloy tube, brass and galvanized steel for water distribution, with no entry for PEX, and every drinking-water pipe, fitting and valve must meet NSF 372 at 0.25% weighted average lead or less. Press-connect fittings are allowed when pressed with a tool the fitting maker certifies, which avoids an open flame inside a chase packed with old framing. The [copper repiping](https://chicagolakerepiping.com/copper-repiping/) page covers tube types and joints.

Sizing is engineering, not habit. The City’s latest code changes removed the old rule that no riser may be smaller than 3/4 inch, while keeping a 1 1/4-inch riser where 1-inch flushometer valves are used. In a tall building, pressure changes with height, and the code requires a pressure-reducing valve where static pressure exceeds 80 psi for permit applications from December 1, 2026. Riser replacement is the moment to check how the building’s pressure is managed floor by floor; the [Chicago water pressure and PRV guide](https://chicagolakerepiping.com/guide/chicago-water-pressure-prv/) explains the valve. The same code changes require check valves or other provisions where hot and cold water can cross, a point to review wherever a stack feeds mixing valves.

## Permits and fees for riser work

Under the Department of Buildings’ Express Permit Program, replacing existing piping is $150 per dwelling unit, and replacing risers in an existing chase adds $150 for each dwelling unit the riser serves. Work that alters, reconfigures or extends the system is not eligible for Express and goes to plan review, which starts with a $600 non-refundable deposit. The licensed contractor named on the permit has to accept the job before it is issued, and work must begin and the inspection be requested within 365 days. The [Chicago repiping permit guide](https://chicagolakerepiping.com/guide/chicago-repiping-permit/) and the guide to [who can repipe in Chicago](https://chicagolakerepiping.com/guide/who-can-repipe-in-chicago/) cover the licensing side.

## What sets the price of a riser job

No published range covers riser replacement, so a riser job is priced from its own survey. The drivers are the number of stacks and floors, the riser sizes, how the chases can be reached, how much finished wall and tile each unit has, how many units sit on each stack and how the phasing has to work around residents. Whether the scope stops at the riser tie-ins or continues into unit branches changes it again. The association should expect the quote to list the openings in each unit, who closes them, where old pipe stays in the chase and the water-off windows by stack.

Smaller buildings follow the same logic on a smaller scale: a [two-flat repipe](https://chicagolakerepiping.com/two-flat-repiping/) has one or two risers and a shared main, and mixed-use buildings with a storefront below the apartments are covered under [commercial repiping](https://chicagolakerepiping.com/commercial-repiping/). For a building on the [Near North Side](https://chicagolakerepiping.com/service-areas/near-north-side/) or anywhere else in the city, the starting point is the same walk from the meter to the top of each stack.

## What's included

- Hot and cold risers in the stack, from the basement or zone main to the top unit they serve
- A shutoff at the base of each riser and a tie-in to each unit's branches, with a unit shutoff where the layout allows
- A riser drawing showing the whole stack, its sizes and its material, for the City permit
- The City Express permit, with the riser fee for each unit served, and the inspection
- Firestopping where the new risers pass through existing floor openings
- Pressure test of each stack before chases close, and a flush after each cutover
- A written schedule of water-off windows by stack, for the association or manager to send to residents
- A list of openings in each unit and who closes them

## Unit branches, one stack or the whole building

|  | In-unit branch repipe | One riser stack | Building-wide riser program |
| --- | --- | --- | --- |
| What gets replaced | Piping inside one unit, from its riser tie-in to its fixtures | The hot and cold risers in one stack and each unit's tie-in | Every stack, in phases, plus the mains feeding them where the scope includes them |
| Who decides | The unit owner, with the association's letter | The association or building owner | The association board or building owner |
| Who is affected by shutoffs | That unit, plus the stack if the riser must be shut to cut over | Every unit on the stack | One stack at a time, so each resident is affected only during their stack's phase |
| City paperwork | Express permit at $150 for the unit, plus the association letter | Express permit with the riser fee per unit served, the full-riser drawing and the letter | The same per stack, or plan review if the work alters or extends the system |
| What stays old | The building's risers and mains | Other stacks and the mains | Only pipe abandoned inside chases, listed on the scope |

## Related resources

- Learn [Do you need a permit to repipe a house in Chicago?](https://chicagolakerepiping.com/guide/chicago-repiping-permit/)What the Department of Buildings' Express permit covers when repiping a Chicago building, what pushes a job into plan review, the documents a riser or condo job needs, and what the suburbs do differently.
- Learn [Galvanized pipes in Chicago homes: what to do about them](https://chicagolakerepiping.com/guide/galvanized-pipes-chicago-homes/)How to tell whether a Chicago bungalow, two-flat or greystone home still has galvanized steel supply pipe, what its symptoms do and do not prove, and how Chicago's code, permits and lead rules shape the fix.
- Learn [When does Chicago's plumbing code require a pressure-reducing valve?](https://chicagolakerepiping.com/guide/chicago-water-pressure-prv/)The City's updated threshold for a pressure-reducing valve, what the valve does at the meter, why high static pressure stresses old and new piping, and how it fits into a repipe.
- Learn [Can you stay home during a repipe, and how long is the water off?](https://chicagolakerepiping.com/guide/living-through-a-repipe/)Why the water stays on through the bulk of a repipe and goes off only when a section is switched over, what the quote should name in advance, and how to plan a house or a two-flat around it.
- Learn [Who is allowed to repipe a house in Chicago?](https://chicagolakerepiping.com/guide/who-can-repipe-in-chicago/)Why a state plumbing license is not enough inside the city limits, what the single-family owner exemption allows and doesn't, how to check the contractor on your permit, and why some plumbers turn the work down.

## How a repipe runs

1. First call What you are seeing, the building type, how many units and fixtures, and any inspection, sale or City notice.
2. Walk-through from the meter The service line material, the main shutoff, the pipe on each floor, and where walls, floors and ceilings can open.
3. Permit and repipe The permit filed for the address, new lines run and connected, then pressure tested and flushed before anything is closed.
4. Inspection and closing up The City or village inspection, labeled shutoffs, and the openings closed as the quote describes.

## What this work looks like

Four new copper risers rising from a main along a basement wall, each with a brass ball valve

Copper risers with branch tees and brass ball valves in an opening where a kitchen wall cabinet was removed

A section of old galvanized riser cut open to show rust scale, beside a short piece of new copper

A pressure gauge on a brass test fitting at the base of a new copper riser in an opened chase

Before

After

## Riser replacement questions

### What is the difference between a riser and the piping inside my unit?

A riser is the vertical pipe that carries hot or cold water up through the building and feeds several units stacked above one another. The branch piping inside a unit leaves the riser and runs to that unit's fixtures. The riser serves everyone on the stack; the branches serve one household.

### Who decides whether a condo building's risers are replaced?

The association does, through the board and whatever approval its declaration requires, because risers serve more than one unit. The City of Chicago also asks for an approval letter signed by someone authorized to sign for the association on any Express permit for condominium property, even for work inside a single unit.

### How long is each unit without water during a riser replacement?

There is no single figure. Water on a stack is off while that stack's risers are cut over, and a phased plan takes one stack at a time so the rest of the building keeps running. The association should get the water-off windows by stack, in writing, before the first shutoff.

### Who pays when a shared riser leaks into my unit?

That depends on the condominium's declaration and bylaws, which say which pipes are common elements and which belong to the unit, and on the insurance policies involved. Whether a riser that serves several units is a common element is something those documents decide. Ask the association for the language before paying for work yourself.

### What does the City charge to permit a riser replacement?

Under the Department of Buildings' Express Permit Program, replacing existing piping is $150 per dwelling unit, and replacing risers in an existing chase adds $150 for each dwelling unit the riser serves. Work that alters or extends the system goes to plan review, which starts with a $600 non-refundable deposit.

## Related services

### Two-flat repiping

The shared basement main, both units' risers and branches, and a shutoff in each apartment, planned around two households and one cutover.

### Commercial repiping

Commercial repiping for mixed-use buildings, small offices and restaurants, in copper, with the permit path, the shutoff windows and the business's hours settled before work starts.

### Partial repiping

A partial repipe replaces a defined part of the supply piping, such as one bathroom, one riser, the hot side or one floor, with every joint to the pipe that stays named on the quote.