DuPage County, IL Building Setbacks & Zoning: Structure Height Limits (2026)
Key Facts
- Base height limit
- 36 feet for single-family homes
- Height bonus
- +1 ft per +1 ft added yard, on 40,000+ sq ft lots
- Absolute maximum height
- 72 feet, even with bonus
- How height is measured
- Average grade to highest roof point
- Base front/rear yards
- 40 ft front, 50 ft rear
- Where it applies
- Unincorporated R-1 district only
- Violation fine
- $100-$500 per week
Summary
DuPage County's R-1 single-family district caps building height at 36 feet under Sec. 37-701.4(A), but a lot of 40,000 square feet or more can add a foot of height for every foot all required yards are increased, up to a hard ceiling of 72 feet.
A.Minimum Yard, Height, FAR and Lot Coverage Required: Single-family detached dwelling 40′ 20′ 40′ 50′ 36′, (except that where a lot size is 40,000 sq. ft. or more, the height of a building or attached structure may be increased 1′ for each 1′ all required yards are increased. The required yard increase shall be measured from the portion of the building or attached structure which exceeds the maximum height. In no case shall the height exceed 72′). .20 NA
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 14 Update 1).
Full Breakdown
Sec. 4(A) sets the height column of the R-1 district's yard, height, FAR and lot coverage table at 36 feet for single-family detached dwellings, historic lots of record with a single-family home, schools, places of assembly, and every other permitted or conditional use in the district. The same subsection carves out a trade-off for larger parcels: on a lot of 40,000 square feet or more, the code lets an owner add one foot of building height for every foot that all required yards are increased beyond the district minimums (40-foot front, 20-foot interior side, 40-foot corner side, 50-foot rear).
The extra yard depth is measured only against the portion of the building that exceeds 36 feet, and no matter how large the lot or how deep the yards, Sec. 4(A) caps total height at 72 feet. 'Building height' is a defined term: Sec. 37-302 measures it as 'the vertical distance measured from average grade to the highest point of the roof,' so the limit runs to the roof peak rather than to a chimney, antenna, or other roof-mounted appurtenance. Like every other R-1 standard, this height limit reaches only unincorporated DuPage County; it does not apply inside Naperville, Wheaton, Downers Grove, Elmhurst, Lombard, Glen Ellyn, Woodridge, Carol Stream or the DuPage County portion of Bolingbrook, each of which sets its own building code.
A homeowner who builds taller than the table allows is subject to the same general zoning enforcement in Sec. 37-1417 that covers every other bulk violation in the ordinance.
Violations & Fines
Exceeding the 36-foot base limit (or the bonus-yard 72-foot maximum) violates Sec. 37-701.4(A) and is enforced under Sec. 37-1417: the zoning official serves a written notice of violation giving the owner 14 days to request an administrative appeal or comply, plus a $100 processing fee. A continuing violation exposes the owner to a court fine of $100 to $500 for each week it remains uncorrected.
Frequently Asked Questions
How tall can a house be in DuPage County's R-1 district?
Does the extra-yard height bonus apply to any house?
Does this 36-foot limit apply in Naperville or Wheaton?
What happens if a new home is built taller than the table allows?
Sources & Official References
Other rules in DuPage County
Compare DuPage County to another location·View the Illinois building setbacks & zoning overview
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