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Naperville, IL Building Safety: Anti-Mansionization (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Governing section
Naperville Municipal Code § 6-2-26
Max height
2.5 stories / 35 feet
Roof peak cap
40 feet maximum
Districts covered
R1, R1A, R1B, R2

Summary

Naperville caps teardown and infill homes in R1, R1A, R1B, and R2 districts at two and a half stories, 35 feet, with a 40-foot roof peak: even where the base zoning district would allow more.

It is the intent and purpose of this Section to regulate the height and building coverage of single-family detached dwelling units and duplexes in existing neighborhoods in R1, R1A, R1B and R2 zoning districts, in order to prevent the overcrowding of land...4.2.Maximum Height: The maximum height shall be two and one-half (2½) stories not to exceed thirty-five feet (35'). In addition, the maximum roof peak height shall be forty (40) feet to the peak of the roof.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 101).

Full Breakdown

Naperville Municipal Code § 6-2-26 governs single-family detached homes and duplexes built on lots resubdivided or platted before 1989, or resulting from demolition and large additions, once a building permit application was accepted after February 15, 2005 for single-family homes or July 5, 2005 for duplexes. Regardless of what the underlying R1, R1A, R1B, or R2 zoning district otherwise permits, these teardown and infill structures are capped at two and one-half stories and thirty-five feet, with a maximum roof peak of forty feet.

Violations & Fines

Building permits that exceed the height cap are denied at plan review; a structure built noncompliant is a zoning violation subject to Naperville's general penalty of $100 to $500 per day (§ 1-4-1).

Frequently Asked Questions

Can a new Naperville teardown home exceed 35 feet even in a district that normally allows taller houses?
No. Section 6-2-26 overrides the underlying district's height rules for qualifying teardown and infill homes, capping them at two and a half stories, 35 feet, with a 40-foot roof peak.
Which Naperville homes count as teardown or infill under the height cap?
Single-family and duplex projects from demolitions, large additions, or lots in pre-1989 subdivisions that are resubdivided or still vacant, once a building permit was accepted after the 2005 effective dates.

Sources & Official References

Other rules in Naperville

Building PermitsSome RestrictionsCarbon Monoxide DetectorsSome RestrictionsBuilding InspectionsSome RestrictionsElectrical PermitsSome RestrictionsPlumbing PermitsSome RestrictionsFire Sprinkler RequirementsHeavy RestrictionsElevator MaintenanceSome RestrictionsScaffold & Sidewalk ShedSome RestrictionsNoise Ordinances: Barking DogsSome RestrictionsParking Rules: Towing & Impound RightsSignificant RestrictionsParking Rules: Preferential Parking DistrictsSome RestrictionsParking Rules: EV ChargingSome RestrictionsFence Regulations: Fence Permit RequirementsSome RestrictionsAnimal Ordinances: Bird ProtectionSome Restrictions

All Naperville rules

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