Oak Park, IL Zoning Overlays & Bonuses: Density Bonus Law (2026)
Key Facts
- Bonus ratio
- 1 market-rate unit per affordable unit built
- Applies to
- Covered developments of 25+ units in TOD areas
- Height overage
- Automatic variation for excess feet
- Fee-in-lieu bar
- Disqualifies developer from bonus
- Penalty
- $200-$500 per offense, per day
Summary
The Village of Oak Park grants a one-for-one density bonus under its Inclusionary Housing article: for every affordable dwelling unit built in a covered development, the developer earns one extra market-rate unit, and any resulting height overage is automatically variated.
12-5-9: DENSITY AND HEIGHT BONUS: A. A density bonus shall be permitted when affordable units are constructed within a covered development in accordance with section 12-5-3 of this article. One bonus market rate dwelling unit shall be permitted for each affordable unit constructed within the covered development. B. If the construction of the affordable unit(s) causes the covered development to exceed a height limitation set forth in the Village's Zoning Ordinance, a variation shall automatically be granted for the number of feet that the covered development exceeds the height limitation.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-9: Code current through: Ord. 26-159, passed - -2026).
Full Breakdown
Oak Park's inclusionary housing ordinance, Village Code Chapter 12, Article 5, applies to covered developments of 25 or more dwelling units seeking zoning relief in a TOD area near a CTA or Metra station (or along Madison Street west of Lombard Avenue). Village Code Section 12-5-9, Density and Height Bonus, ties the bonus directly to compliance with the affordable-unit requirement in Section 12-5-3: for each affordable unit a developer constructs within the covered development, the Village permits one additional bonus market-rate dwelling unit. If building the required affordable units pushes the development over a height limit set in the separate Zoning Ordinance of the Village of Oak Park, Section 12-5-9(B) requires the Village to automatically grant a variation for the number of feet by which the development exceeds that limit, so the developer does not need a separate variance hearing for that overage.
00) per unit and adjusted annually to the consumer price index, is expressly disqualified from the density or height bonus under Section 12-5-7(E). The bonus therefore rewards on-site construction of affordable units rather than the cash buyout. 00) per offense, with each day of continuing noncompliance a separate offense.
Violations & Fines
Violating the inclusionary housing article, including misuse of the density or height bonus, exposes a developer to Village injunction or mandamus action and a fine of $200.00 to $500.00 per offense under Section 12-5-10, with each day of continued violation counted as a new offense. A developer who accepted the fee in lieu is not eligible to also claim the bonus.
Frequently Asked Questions
How does Oak Park's density bonus work?
Does the bonus cover height limits too?
Can a developer pay a fee and still get the bonus?
Sources & Official References
Other rules in Oak Park
Compare Oak Park to another location·View the Illinois zoning overlays & bonuses overview
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Density Bonus Law in Nearby Cities
How other cities in Cook County handle density bonus law.