Oak Park, IL
Oak Park plumbing permit cost
An Oak Park plumbing permit is a permit separate from the general construction permit — "because plumbing requires specialized skills and knowledge"
as the Village's page puts it, and because improper work "can cause significant water damage to a building". The schedule prices the PLUMBING section in four rows: alterations — piping, fixtures and similar work — at $100.00 per unit; system installations — water heaters, water softeners, lawn irrigation, grease interceptors, sewer systems, drain tile, RPZ devices — at $175.00 per system or unit; flood control and sewer backup protection at $200.00 per system or unit; and a sanitary or storm sewer connection or repair at a flat $250.00 (with a refundable $1,000.00 restoration deposit where a right-of-way opening is made). Owners of single-family homes may pull the permit themselves by affidavit.
How this fee is calculated
These are the components the schedule defines for this permit, as they applied on 2026-09-28. A component only applies to your project if its conditions match — read that column before assuming a figure. Want a figure for your own project? Estimate this fee with the permit fee calculator.
| Component | Formula | Applies when | Range |
|---|---|---|---|
| Plumbing alterations: $100.00 per unitPermit fee | $100 per fixture | plumbing scope is alteration and Fixtures is provided | — |
| Flood control and sewer backup control: $200.00 per system or unitPermit fee | $200 per fixture | plumbing scope is flood control and Fixtures is provided | — |
| Sanitary or storm sewer connection or repairPermit fee | $250.00 flat fee | plumbing scope is sewer connection | — |
| Plumbing system installations: $175.00 per system or unitPermit fee | $175 per fixture | plumbing scope is system installation and Fixtures is provided | — |
A real permit fee is these components added together. The department’s final calculation is the one that applies — this is the schedule it will be based on.
A worked example
Follow the arithmetic by hand. Every line is produced by the engine from the rules above, so the total cannot drift away from the schedule behind it.
Worked example
A basement flood-control project on a single-family home: interior overhead plumbing modification and a new exterior backwater valve, plus replacement of the water heater on the same plumbing permit.
| Input | Value |
|---|---|
| Fixtures | 1 |
| Plumbing scope | flood_control |
Example total
$200.00
An estimate, not an official fee. It is calculated from the published fee schedule as it applied on 2026-09-28. The permit office’s own calculation is the one that applies, and your project may fall under rules this schedule does not describe.
Fee schedule as of 2026-09-28Rules applied 1Rules considered 4
| Component | How it is calculated | Amount |
|---|---|---|
Flood control and sewer backup control: $200.00 per system or unitPermit feePLUMBING — "Flood control/sewer backup control (interior overhead modification, exterior backwater-valve and other applicable work)" at $200.00 per system/unit. The unit is the fixture, device or unit of work the job touches, and the Village requires this as a permit separate from a general construction permit: "A permit separate from a general construction permit is required because plumbing requires specialized skills and knowledge."Show the working
| $200 per fixture | $200.00 |
| Total | $200.00 |
Fees that do not apply here
Listed so you can see what was considered and left out, rather than wondering whether something is missing. A rule can also be left out because it is not published for this permit at all, and that is stated where it matters.
- Plumbing alterations: $100.00 per unit — This fee does not apply to the inputs provided.
- Sanitary or storm sewer connection or repair — This fee does not apply to the inputs provided.
- Plumbing system installations: $175.00 per system or unit — This fee does not apply to the inputs provided.
Assumptions
- Calculated from 1 fee rule in effect on 2026-09-28.
- Amounts are rounded to the nearest cent, once, at the end of each component.
Flood control is $200.00 per system or unit, and the project is one system: $200.00. The water heater is a separate row — system installations at $175.00 each — and the schedule names water heaters among its examples explicitly, so the whole permit is $200.00 plus $175.00 = $375.00.
The per-unit rows behave the same way: a job replacing fixtures across five bathrooms is five units on the $100.00 alteration row — $500.00. And a sewer connection or repair is the one flat row at $250.00, with the $1,000.00 restoration deposit named here but not charged, because the schedule marks it refundable.
What is different in Oak Park
Most of this schedule is priced per unit of what the job touches: replacing fixtures in five bathrooms is five units — $500.00 — on the alteration row, while one water heater is one $175.00 system. Flood control work (overhead plumbing, backwater valves) is the same structure at $200.00 per system. The sewer connection is the one flat row: $250.00, and the $1,000.00 restoration deposit that may accompany it is refundable, so it is named on the page rather than added to the fee. Where a job covers two kinds of plumbing work, each row is charged — a water heater replacement with a new backwater valve is $175.00 plus $200.00.
What this figure does not include
Impact fees, utility connections and other departments’ permits are the usual omissions, and in some jurisdictions they are larger than the permit fee itself.
Not included in these figures
This estimate is the plumbing rows of the 2026 Construction Fees that can be computed from a count the applicant gives. It excludes:
- Water service work, which the schedule defers to the Water & Sewer Division's separate *Schedule of Water Service Cost and Fees* — repairing or replacing an existing service and new water connections alike. Only the sanitary/storm sewer connection is priced here.
- The $1,000.00 ROW restoration deposit that may accompany the sewer connection. It is refundable if applicable, so it is a deposit and not part of the fee.
- Sump pumps and drain tile attached to flood control are on the flood-control row, but interior demolition to reach the plumbing is a building-alterations row priced "whichever is greater" between $300.00 per unit and $.35 × SF — a comparison this site names rather than computes.
- The permit application deposit — $100.00 residential or $200.00 commercial, applied to the permit fee rather than added to it.
- Re-inspection and penalty rows ($100.00 re-inspection after the second visit; work without a permit at a $300.00 minimum or double the fee), which are enforcement charges rather than the fee for the work.
What you need before applying
- A separate permit, with an affidavit route for single-family ownersRequired
Plumbing is permitted separately for the same reason the Village gives for electrical: "plumbing requires specialized skills and knowledge", and improper work "can cause significant water damage to a building". Owners of single-family homes may obtain the permit by signing an affidavit attesting to their intent to do the work themselves. Fees run $100.00 per unit for alterations, $175.00 per system for installations, $200.00 per system for flood control, and $250.00 flat for a sewer connection.
Common questions
How much is a plumbing permit in Oak Park?
Four published rows: $100.00 per unit for alterations and repairs (piping, fixtures, similar work), $175.00 per system for installations (water heater, softener, irrigation, grease interceptor, sewer system, drain tile, RPZ), $200.00 per system for flood control and sewer backup protection, and $250.00 flat for a sanitary or storm sewer connection or repair.
Village of Oak Park 2026 Construction Fees, PLUMBING
Can I do my own plumbing work in Oak Park?
If you own a single-family home, yes: the Village's page says owners "may obtain a plumbing permit by signing an affidavit attesting to their intent to do the work themselves." The fee is the same either way — the affidavit changes who does the work, not what the permit costs.
Village of Oak Park — Building Permits
Is a water heater replacement $100 or $175?
$175.00, on the system-installation row: the schedule names water heaters among its examples explicitly. The $100.00 per-unit row is for alterations and repairs to existing piping and fixtures. Replacing a heater that serves the building is a system installation, not a fixture alteration.
Village of Oak Park 2026 Construction Fees, PLUMBING
What is the $1,000 deposit on a sewer connection?
A refundable right-of-way restoration deposit. The schedule's sewer row reads "$250.00, plus $1,000.00 restoration deposit, if applicable", and the ROW section describes it as the Public Works refundable deposit for each opening. It comes back when the opening is restored, so this page names it rather than charging it.
Village of Oak Park 2026 Construction Fees, PLUMBING / PUBLIC WORKS
Does a plumbing permit cover the water service too?
No. The schedule defers water service work — repairing or replacing an existing service, new connections — to the Water & Sewer Division's separate *Schedule of Water Service Cost and Fees*. Only the sanitary/storm sewer connection and the drainage rows are priced on the construction fee schedule this page uses.
Village of Oak Park 2026 Construction Fees
Source and verification
The documents behind every figure on this page, with the dates that make them checkable.
- Fee schedule (PDF)CityPrimary source
Village of Oak Park 2026 Construction Fees (Annual Fee Ordinance §7-8-1)
One document, updated 01/26/2026 on its face, carrying the ordinance's own heading 'Construction Fee(s) Effective on March 1st, 2026'. Read with pdftotext; the ICC chart was transcribed cell by cell and re-checked against the schedule's own arithmetic (an R-3 Type IIIA building at $195.98 × .0194 × area). The chart and its footnotes are credited to ICC Building Valuation Data, August 2025.
- City websiteCityPrimary source
Village of Oak Park — Building Permits
The Village's permit information page, and the authority for the stand-alone trade structure: 'A separate permit from a general construction permit is necessary because electrical work requires specialized skills and knowledge', with the same reasoning for plumbing. It also records that owners of single-family homes may pull their own plumbing permit by affidavit.
Verification
Last verified against the official source in Sep 2026.