Bolthole Index

DuPage County, Illinois

Building permits, zoning and land rules in Naperville, Illinois

Naperville, Illinois requires city building permits before new construction, additions and remodeling.1 Naperville sets its own zoning; septic permits for property in DuPage County come from DuPage County Health Department.23 Naperville also extends into Will County, so confirm the parcel’s county before arranging septic approval.3

At a glance

Building permits
Required from the City of Naperville before covered construction1
Zoning
City zoning applies inside Naperville city limits2
Septic permits
DuPage County Health Department for DuPage-side private sewage systems34
Residential camping
Allowed with the property owner’s permission; permanent RV occupancy remains unconfirmed5
Lot size
R3 single-family detached and duplex lots: 6,000 square feet, subject to district exceptions6
Owner-builder
Limited Illinois plumbing exemption; no general building-permit exemption established78

Who to call

Building permits

City of Naperville Building Permits, TED Business Group

City building permits, code questions and inspection scheduling

(630) 420-6100

[email protected]

400 S. Eagle St. Naperville, IL 60540

Septic permits

DuPage County Health Department Plan Review

New and repaired septic-system permit questions for DuPage County parcels

630-221-7045

111 N County Farm Road Wheaton, IL 60187

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

Going off-grid in Naperville means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Naperville, IL?

Naperville requires building permits before new buildings, additions, remodeling, decks, patios, fences and pools.1 Naperville may also require building permits for driveways, accessory outbuildings, lawn sprinklers and equipment installations.1 Some roofing and siding replacements are exempt when existing roof sheathing remains in place; ask Building Permits about the proposed materials before treating a replacement as exempt.1 Plans submitted on or after April 1, 2026 are reviewed under Naperville’s updated adopted codes and local amendments.9

Who issues building permits and schedules inspections in Naperville?

Naperville’s Building Permits office is the city counter for building-permit and code questions; contact the TED Business Group using the details below.10 Naperville directs building-permit applicants to its Permitting, Plans and Licensing Portal.10 For new single-family houses and duplexes, email [email protected] for submission instructions.10 Required construction inspections appear in the portal and can be scheduled online or by telephone; Naperville asks applicants to schedule at least 72 hours ahead.11 The city’s permit and approved plans become available online after issuance.12

Does Naperville have zoning, lot-size rules and setbacks?

Land inside Naperville city limits is governed by the city’s zoning regulations; direct parcel-specific zoning questions to the City Planning Division.213 In Naperville’s R3 district, single-family detached dwellings and two-family duplexes have a minimum lot area of 6,000 square feet, subject to the provision’s exceptions.6 For R3 residential uses other than multiple-family dwellings, the listed yards are 25 feet front, 6 feet interior side, 15 feet corner side and 25 feet rear.14 Those measurements are district-specific, so ask City Planning to identify the parcel’s district and applicable use category before designing a home.614

How do septic permits and wells work inside Naperville?

DuPage County Health Department handles private sewage systems serving Naperville property on the DuPage side, including areas without public sewer.3 Installing a new septic system or repairing an existing system in DuPage County requires a septic permit; Plan Review is the named contact.4 The published fees are $684 for a new private sewage system permit and plan review, and $344 for septic repair or renovation, with annual adjustments.4 New or repaired private wells in DuPage County also require a health-department permit.15 Naperville extends into Will County; the DuPage septic authority identified here does not establish the authority for Will-side parcels.3

Can you live in an RV or tiny home in Naperville?

Naperville allows camping on residential property with the property owner’s permission and consent.5 The residential camping permission does not establish permanent RV occupancy or permission to use a tiny home as a dwelling; we could not confirm those answers, so describe the proposed arrangement to the City Planning Division before relying on it.513 Naperville’s construction and zoning review still applies to covered building projects.112 Buyers planning rental income should also know that short-term residential rentals within Naperville’s corporate limits are prohibited.16

What are the steps to building a home in Naperville?

Start with Naperville City Planning to confirm the zoning district and applicable lot and yard requirements.13614 For a DuPage-side parcel needing private sewage disposal, arrange septic permit review with DuPage County Health Department.34 Contact Naperville Building Permits for new-house submission instructions, then submit the required application and plans for city review.1012 Correct any deficiencies the city identifies, and after issuance post the building permit visibly from the street and keep approved stamped plans on site for inspections.12 Schedule required inspections at least 72 hours ahead.11

What should you check before buying land in Naperville?

For land outside Naperville city limits, use the DuPage County guide for the county’s unincorporated building and zoning rules.1718 Inside Naperville, ask Building Permits for a project-specific fee estimate: the published residential schedule depends on scope and may involve additional land-development, utility-service and school or park charges.19 We could not confirm Naperville’s public-water or sanitary-sewer connection threshold; ask the city about service availability and required connections before choosing a private system.10 Illinois’s owner-occupant plumbing exemption is limited and does not establish a general exemption from local building permits or inspections.78

Watch-outs

  • Naperville’s R3 lot-size and yard measurements are not citywide defaults.614
  • DuPage County septic guidance does not establish the health authority for Naperville parcels in Will County.3
  • Permission to camp on residential property does not confirm permanent RV or tiny-home occupancy; ask Naperville City Planning.513

Sources

  1. Building Permits (Naperville), quoted and re-checked
  2. Code of Ordinances, Naperville (Naperville), quoted and re-checked
  3. DuPage County Health Department Fees (Naperville), quoted and re-checked
  4. Sewage, quoted and re-checked
  5. 10-2-1-2: Camping, Sleeping, or Storing Personal Property on Public Ways in the Downtown (Naperville), quoted and re-checked
  6. R3 Medium Density Multiple-Family Residence District (Naperville), quoted and re-checked
  7. HB5913 Enrolled — Illinois Plumbing License Law amendment (Illinois statewide rule), quoted and re-checked
  8. 225 ILCS 320/18 — Local regulation; Department standards (Illinois statewide rule), quoted and re-checked
  9. Building Codes (Naperville), quoted and re-checked
  10. City of Naperville Building Permits, TED Business Group (naperville.il.us)
  11. Building Permits (Naperville), quoted and re-checked
  12. Building Permits (Naperville), quoted and re-checked
  13. City of Naperville City Planning Division (naperville.il.us)
  14. R3 Medium Density Multiple-Family Residence District (Naperville), quoted and re-checked
  15. Water, quoted and re-checked
  16. naperville.il.us (Naperville), quoted and re-checked
  17. Building and Permits, quoted and re-checked
  18. DuPage County Zoning Portal, quoted and re-checked
  19. Building Permit Fee Schedule (Naperville), quoted and re-checked

Written October 11, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Naperville

Naperville’s own rules

  • Building permitRequired

    New construction, additions, remodeling, decks, patios, fences, pools, and other listed construction projects inside Naperville.

    • Some roofing and siding replacements are exempt when the existing roof sheathing remains in place.
    • Permits may also be required for water softeners, air conditioners, antennas, lawn sprinkler systems, driveways, and accessory outbuildings.
    “Residents are required to obtain the necessary building permits from the City of Naperville before beginning any new construction project. Construction projects include new buildings, additions and remodeling, decks, patios, fences and pools.”
  • Building code adoptedAdopted (with conditions)

    Plans submitted to Naperville on or after April 1, 2026.

    • The City reviews plans under the listed 2024 International codes, 2023 National Electric Code, 2018 Life Safety Code, current Illinois codes, National Fire Code, and local amendments.
    “Per Ordinance 26-010, passed by the City Council in February 2026, all plans submitted on or after April 1, 2026 will be reviewed based on:”
  • InspectionsRequired

    Permitted construction inside Naperville.

    • Required inspections are listed in the online portal.
    • Inspections may be scheduled online or by telephone.
    • Inspections should be scheduled at least 72 hours in advance.

    advance scheduling: >= 72 hours

    “Required inspections will be listed in the portal. Inspections can be scheduled through the online portal at any time, or by calling (630) 420-6100, option 1, Monday-Friday 9 a.m. to 4 p.m. (Closed daily from 1-2 p.m.) If all lines are busy, please remain on the lines. Calls are answered in the order they are received. Please schedule all inspections at least 72 hours in advance.”
  • Local zoningPresent

    Land inside Naperville city limits is governed by the City's Title 6 zoning regulations.

    “Farming shall be permitted in any zoning district. Dwelling units which are accessory to the farming uses shall also be permitted; provided, that the occupants of the dwelling units are engaged in agricultural activities on the premises as their principal means of livelihood.”
  • Camping on your landAllowed (with conditions)

    Camping on residential property inside Naperville.

    • The property owner must give permission and consent.
    • Camping or sleeping on public ways is prohibited in the defined downtown area, subject to listed exceptions.
    “Camping is permitted on residential property with the permission and consent of the property owner.”
  • Short-term rentalsProhibited

    Short-term residential rentals within Naperville's corporate limits.

    • The ordinance contains a limited pre-existing exception for agreements signed before August 19, 2020 and rental dates through October 19, 2020.
    • The City page states fines of $1,000 per day, increasing to $2,500 per day for subsequent offenses within 12 months.

    effective date: 2020-09-01 · fine: 1000 USD per day (subsequent offenses within 12 months may be $2,500 per day)

    “Effective September 1, 2020, it is unlawful to operate, use, offer for rent, or advertise for rent or use, any property within the corporate limits of the City of Naperville as a short-term residential rental.”
  • Permit feesPublished (with conditions)

    Residential building permits issued by Naperville.

    • Fees depend on project scope.
    • Additional land-development, utility-service, and school/park-donation fees may apply.
    • The schedule states it is a good-faith estimate.

    effective date: 2019-02-01 (per Ordinance 18-145) · new single-family/duplex clerical fee: 18 USD · new single-family/duplex permit fee: 182 USD · plan review fee: 25 USD per plan page (4-page minimum) · inspection fee: 50 USD per inspection

    “The following represents a good faith estimate of the building fees associated with construction permitting by the City of Naperville. The manner in which the fees are applied will be based on the scope of the proposed project and will be determined by Naperville’s Transportation, Engineering & Development group at the time of permitting.”
  • Permit processPublished (with conditions)

    Building permit applications inside Naperville.

    • Applications and required documents are reviewed by City staff.
    • Projects may be reviewed by multiple departments.
    • Deficiencies require resubmission.
    • Once issued, the permit must be posted visibly from the street and approved stamped plans kept on site during inspections.
    “The application and all required documents will be reviewed by City staff. Depending on the type and scope of the project, the application may be reviewed by many different departments to ensure the proposed work complies with all of the applicable building and zoning codes.”

Rules another office applies inside Naperville

Naperville does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Minimum lot sizeSpecified

    Single-family detached dwellings and two-family duplexes in Naperville's R3 district.

    • The cited R3 provision also contains different minimum-area rules for attached dwellings, multiple-family dwellings, mixed developments, schools, and other uses.

    minimum lot area: >= 6000 square feet per lot

    “Single-family detached dwellings; two-family duplexes except as otherwise provided in Subsection 6-6E-5:4 below; nursery schools, preschools, and daycare centers; clinics: Six thousand (6,000) square feet per lot.”
  • SetbacksSpecified

    Residential uses other than multiple-family dwellings in Naperville's R3 district.

    • The cited R3 provision contains separate yard rules for other permitted and conditional uses and special subdivision measurement rules.

    front yard: 25 feet · interior side yard: 6 feet · corner side yard: 15 feet · rear yard: 25 feet

    “Front yard | 25 feet Interior side yard | 6 feet Corner side yard | 15 feet Rear yard | 25 feet”
  • Who permits septicCounty (with conditions)

    Private sewage systems serving property in DuPage County, including Naperville areas not served by public sewer.

    • Naperville is located in DuPage County and also extends into Will County; this source establishes DuPage County Health Department permitting but does not establish which department handles parcels in Will County.
    “New Private Sewage Disposal System Permit and Plan Review | $684”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Naperville or DuPage County directly.

  • Owner-builder exemption — Owner-builder exemption from Naperville building permits or inspections.
  • Minimum dwelling size — Minimum dwelling size inside Naperville residential districts.
  • Lot coverage — Lot coverage inside Naperville residential districts.
  • Building height — Building height inside Naperville residential districts.
  • Tiny homes — Permanent occupancy of tiny homes inside Naperville.
6 more unanswered
  • Manufactured homes
  • Accessory dwellings
  • Septic inspection
  • Off-grid sanitation
  • Mandatory utility hookup
  • Subdividing land

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Naperville publishes no rule on the point, not that none exists. DuPage County’s page lists the county offices to call.

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