# Whole-House Repiping in Oak Park, IL: PEX or Copper

> Repiping in Oak Park, IL: the Village follows the Illinois Plumbing Code, so PEX and copper are both options. Permit fees, lead lines and next steps.

URL: https://chicagolakerepiping.com/service-areas/oak-park/

Last Updated: October 25, 2026

**Village of Oak Park Development Services** Issues the plumbing permit (Village of Oak Park)

**Illinois Plumbing Code: PEX or copper** The code that decides the water pipe

**Village of Oak Park Water & Sewer** Water utility

**n/a** Water-piping permits in City records

## What starts a repipe in Oak Park

### Two quotes, two materials

One contractor prices copper, another prices PEX. In Oak Park both can be code-legal, so the difference is routing, wall openings and fittings, not one quote being wrong.

### A 1920s house with steel supply pipe

Over half of Oak Park's housing predates 1940. Where galvanized steel is still in the basement ceiling, it narrows from the inside, and the far fixtures feel it first.

### A lead or galvanized service line

The Village keeps a service line inventory. A line flagged lead or galvanized is a separate permit and a separate trench from the pipes inside the house.

### Moving to the next village

River Forest and Forest Park share Oak Park's streetscape but not every rule. River Forest limits where PEX can go, so a plan that works on one side of Harlem may not on the other.

## Services in Oak Park

### Whole-house repiping

Whole-house repiping replaces every hot and cold supply line from the main shutoff to the fixtures in the material the local code lists, then pressure tests it before the walls close.

### PEX repiping (suburbs)

PEX repiping for Chicago suburbs whose plumbing code lists it: a manifold or trunk-and-branch layout, joined to the copper service at the main shutoff.

### Copper repiping

Copper repiping replaces water supply piping in tube of the weight the design and local code call for, joined by an approved method and supported so it can move as it heats.

### Galvanized pipe replacement

Galvanized pipe replacement swaps restricted steel supply pipe for copper, with code-listed transitions wherever old pipe stays and a flush after every cutover to clear loosened scale.

### Lead service line replacement

A full replacement of the buried water service from the main to the building, with the City's free programs checked first and the new line's basement tie-in planned with the piping it feeds.

### 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.

An Oak Park repipe starts with a choice that a repipe a few blocks east, in Chicago, does not offer. The Village enforces the Illinois Plumbing Code, 77 Illinois Administrative Code 890, and that code’s table of materials for water distribution lists PEX alongside copper, so an Oak Park owner can actually weigh one against the other.

Oak Park homeowners can bring that decision to [Chicago Lake Repiping](https://chicagolakerepiping.com/), which offers and manages [whole-house repiping](https://chicagolakerepiping.com/whole-house-repiping/), [galvanized pipe replacement](https://chicagolakerepiping.com/galvanized-pipe-replacement/) and [lead service line replacement](https://chicagolakerepiping.com/lead-service-line-replacement/) in the Village. Licensed and insured plumbing contractors do the work and pull the Village permit.

## PEX or copper in an Oak Park house

The Village’s code amendments for permits applied for after January 1, 2026, change the state plumbing code in only two places, restroom fixture counts and WaterSense fixtures. Nothing in that document touches water distribution materials. The amendments are a highlights document, though, and the Village notes that other ordinances may apply, so the material on an Oak Park quote is confirmed with Development Services for the address before work starts.

Where both are allowed, the choice turns on the house rather than on a general ranking. [PEX](https://chicagolakerepiping.com/pex-repiping/) is flexible tube, so a run can be pulled through a closed plaster wall from one opening to the next instead of being cut and fitted at every turn. It can be laid out trunk-and-branch like copper or as home runs from a manifold, one line per fixture. [Copper](https://chicagolakerepiping.com/copper-repiping/) is rigid, so it needs more access at turns and fittings, but it handles exposed basement runs well and joins cleanly to copper that is staying. Copper costs more than PEX as material. Labor, wall openings and patching move the total as much as the pipe does, which the [PEX vs copper guide](https://chicagolakerepiping.com/guide/pex-vs-copper-repipe/) covers.

One detail travels with any change from metal pipe to plastic. If the old metal water piping was part of the house’s electrical grounding or bonding, removing it changes that path, so an electrician should confirm the grounding before the job closes. Homeowners also report plumbers who decline PEX even where a village allows it; a copper quote in Oak Park is a preference, not a code requirement.

## Permits and fees at Village Hall

Repipe permits in Oak Park come from the Village’s Development Services, not from the City of Chicago, and the fees follow the Village’s own schedule. The current construction fee schedule lists $100 per unit for a standalone plumbing alteration, repair or replacement of piping or fixtures, and $175 per system or unit for installing a new or replacement plumbing system. Which line a whole-house repipe falls under is the Village’s call when the permit is filed. Work started without a permit carries a penalty of at least $300 or twice the permit cost.

Service line work is separate again. The Village’s water service schedule lists a $250 permit for repairing or replacing a water service, waived for emergency leak repairs, and an upgraded service needs a new meter purchased from the Village: $475 for 5/8 inch, $520 for 3/4 inch and $635 for 1 inch, with a 1-inch tap at $950. Permit submittals include a Water Service Upgrade Worksheet. The [repiping cost guide](https://chicagolakerepiping.com/guide/repiping-cost-chicago/) sets these next to Chicago’s Express permit fees.

## Oak Park’s pre-war houses and where their pipe runs

Oak Park’s housing is older than Chicago’s as a whole. By the Census Bureau’s American Community Survey, as compiled by the Chicago Metropolitan Agency for Planning, 59.3% of the Village’s 24,872 housing units were built before 1940, against 38.8% citywide, and the median year built is 1938. About 39.7% are detached single-family houses, while 21.4% sit in buildings of 5 to 19 units and 25.4% in buildings of 20 or more, so a repipe here can mean a single house or a courtyard building with risers. The Frank Lloyd Wright-Prairie School of Architecture Historic District and the Ridgeland-Oak Park Historic District hold blocks of early twentieth-century houses with plaster walls and original trim, where every opening has to be planned and closed well; the [plaster walls guide](https://chicagolakerepiping.com/guide/repiping-plaster-walls/) explains how.

Age is context, not proof. A 1910s house near Unity Temple may have been repiped in copper decades ago, and a later house may still have steel. Where [galvanized steel](https://chicagolakerepiping.com/guide/galvanized-pipes-chicago-homes/) remains, it corrodes from the inside, and the restriction shows first at the fixtures furthest from the meter.

The water itself is Chicago’s. The Village’s water quality report says Oak Park’s Lake Michigan water arrives already treated from Chicago’s Jardine Water Purification Plant, with the same corrosion control, so the source does not change the material decision.

## The service line under the parkway

The Village publishes a service line inventory at leadfreeoakpark.com. Its water quality report says lead or galvanized lines are replaced with copper when the Village replaces the water main, or when an owner elects to replace the private side. Illinois has required full replacement of a lead service line, public and private sides, since January 2023, so a partial swap is no longer an option. New one- and two-family houses must get a new water service, a new meter and a new parkway buffalo box. A repipe that ends at the main shutoff can go ahead first, but if the service line is also coming out, planning both lets the new interior pipe meet the new service at a meter sized for it; see [repiping after lead service line replacement](https://chicagolakerepiping.com/guide/repipe-after-lead-service-line-replacement/).

## River Forest and Forest Park next door

River Forest, west across Harlem Avenue, also follows the state code but adds its own limit. Its code amendments allow PEX for water distribution in residential buildings only above grade and covered by at least 5/8-inch drywall or another approved protective material. Read plainly, that leaves out exposed basement runs and pipe below grade, so a River Forest job can be PEX in the finished walls and copper in the basement. The Village confirms how the rule applies to each house. River Forest’s 4,680 housing units are 87.7% owner-occupied, and 42.2% were built before 1940.

Forest Park, to the south and west, has a different housing shape: 47.8% of its units predate 1940 and 23.0% sit in buildings of two to four units, including 15.1% in two-unit buildings. For a Forest Park two-flat, the plan is the one on the [two-flat repiping](https://chicagolakerepiping.com/two-flat-repiping/) page, with the material and permit confirmed with the Village for the address.

## How an Oak Park repipe is planned

The first visit begins at the meter and main shutoff. Static pressure is read at a hose bibb, and flow is compared at the lowest and highest fixtures, which separates a supply problem from a problem in the pipe inside the walls. From there the walk-through follows the main to the water heater and each fixture group and marks where pipe can climb.

If the owner is choosing between materials, both are scoped against the same openings so the quotes compare like for like. Plaster is opened in clean rectangles at fittings and turns, and tile walls are reached from the back where possible. New pipe is pressure tested before walls close, the system is flushed after cutover, and aerators and screens are cleaned. Shutoffs are labeled. The quote lists every opening and who closes it, where any old pipe stays, and the working days and water-off windows; water is off only during cutovers. Across the city line, [Austin](https://chicagolakerepiping.com/service-areas/austin/) follows Chicago’s copper-only rule.

## Neighborhoods and coverage

- Frank Lloyd Wright-Prairie School of Architecture Historic District
- Ridgeland-Oak Park Historic District
- Gunderson Historic District

### Landmarks

- Frank Lloyd Wright Home and Studio
- Unity Temple
- Arthur Heurtley House
- Frank W. Thomas House
- Oak Park Village Hall

### Routes

- CTA Green Line: Ridgeland, Oak Park and Harlem/Lake stations
- CTA Blue Line (Forest Park branch): Austin, Oak Park and Harlem stations
- Metra Union Pacific West line: Oak Park station

1. 1. Auburn Gresham
2. 2. Austin
3. 3. Evanston
4. 4. Greater Grand Crossing
5. 5. Lake View
6. 6. Near North Side
7. 7. Oak Park
8. 8. Roseland
9. 9. South Shore
10. 10. Park Ridge
11. 11. Skokie

## Oak Park questions

### How much does a whole-house repipe cost in Oak Park?

A typical Chicago-area range for repiping a single-family house is $5,000 to $15,000+, and fully finished two- and three-story homes run higher. The Village's plumbing permit is separate: its fee schedule lists $100 per unit for a plumbing alteration, repair or replacement and $175 per system for a new or replacement plumbing system, and the Village decides which line applies.

### Is PEX allowed for a repipe in Oak Park?

Oak Park adopts the Illinois Plumbing Code, and the state's table of water distribution materials lists PEX as well as copper. The Village's published amendments do not change that table. Other Village chapters can still apply, so the material is confirmed with Development Services for the address before the permit is filed.

### Why would a contractor quote copper in Oak Park if PEX is allowed?

Because allowed is not the same as required. Some plumbers prefer copper for exposed basement runs, for the fittings they stock or for how the job ties into existing copper. Homeowners report plumbers declining PEX even where the village allows it. Compare the quotes on routing, openings and fittings rather than material alone.

### Does River Forest allow PEX the way Oak Park does?

Not in the same way. River Forest's amendments allow PEX for water distribution in residential buildings only above grade and covered by at least 5/8-inch drywall or another approved protective material. Exposed runs and pipe below grade fall outside that wording, and the Village confirms how it applies to a given house.

### Who replaces the lead service line at an Oak Park house?

The Village's water quality report says lead or galvanized service lines are replaced with copper when the Village replaces the water main, or when the owner chooses to replace the private side. An owner-initiated replacement needs its own water service permit, which the Village fee schedule lists at $250, plus a new meter where the service is upsized.

## Related guides

- Decision Guide [PEX vs copper: which is better for a repipe around Chicago?](https://chicagolakerepiping.com/guide/pex-vs-copper-repipe/)Neither pipe wins everywhere. Where your address sits decides whether there is a choice at all, and where there is one, routing, joints, exposure and budget decide it.
- 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 [How are plaster walls opened and patched during a repipe?](https://chicagolakerepiping.com/guide/repiping-plaster-walls/)How new supply pipe gets through a lath-and-plaster house, where the openings go and why, and how to read the restoration lines on a repipe quote so nothing is left to assumption.
- Decision Guide [Should you repipe after your lead service line is replaced?](https://chicagolakerepiping.com/guide/repipe-after-lead-service-line-replacement/)A lead service line replacement brings a new copper service to the basement wall. Whether the pipe it now feeds should go too depends on what that pipe is, where the new line comes in, and how the two permits fit together.

## Nearby service areas

- [Austin](https://chicagolakerepiping.com/service-areas/austin/)City of Chicago Department of Buildings permits, Chicago Plumbing Code: copper