Bolthole Index

Madison County, Illinois

Building permits, zoning and land rules in Alton, Illinois

Alton, Illinois issues city building permits and enforces city zoning through its Code Enforcement Office.1 Inside Alton in Madison County, city sewer-connection rules can require public sewer; Madison County Planning & Development handles private sewage systems where sewer is unavailable and site conditions qualify.23 Alton requires qualifying dwelling units to have at least 800 square feet of habitable area, so a small-home plan needs an early size check.4

At a glance

Building permits
City-issued through Alton Code Enforcement1
Zoning
Alton has city zoning districts; requirements depend on the district5
Septic
Madison County Planning & Development; only where public sewer is unavailable and cannot be extended, with acceptable soils3
Minimum home size
At least 800 square feet habitable area and 600 square feet footprint for qualifying dwelling units4
Owner-builder
Qualifying owner-occupant plumbing work has a limited state exemption; local permit requirements remain67
Private wells
Madison County Health Department permit before construction or deepening; $100 non-refundable water-well fee8

Who to call

Building permits

Alton Code Enforcement Office — Building and Zoning

City building permits, zoning administration, plan review and construction and occupancy inspections

618.463.3500

[email protected]

101 E. Third Street Alton, IL 62002

Online permits →

Septic permits

Madison County Planning & Development — Private Sewage Permits & Inspections

Private sewage permits, installation inspections and installer licensing

(618)296-4663

[email protected]

157 N. Main Street, Suite 254 Edwardsville, IL 62025

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

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

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Do you need a building permit in Alton, IL?

Alton’s Code Enforcement Office issues building permits and reviews plans for new construction and renovations.1 Alton has adopted building, residential, existing-building, fire, mechanical and property-maintenance codes, alongside electrical and plumbing codes.9 Ask the city office which building and trade applications your project needs before starting work.1 Alton publishes separate fees by work category: residential mechanical and plumbing permits are $50, residential fence permits are $50, and reinspection costs $35.10 Those fees are not a flat price for an entire new home; the published schedule distinguishes permit categories and residential and commercial work.10

Who handles building permits and zoning in Alton?

The Alton Code Enforcement Office handles city building permits, zoning enforcement, plan review and construction inspections.1 Reach the office at 618.463.3500 or contact the Zoning Administrator at [email protected]; the office is at 101 E. Third Street, Alton, IL 62002.1 The city provides building-permit applications through its linked online application service.1 Ask that office about your proposed use and building layout; septic review stays with Madison County Planning & Development rather than the city building counter.13 For land outside Alton city limits, use the Madison County guide: the county’s building-permit requirement applies to unincorporated land.11

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

Alton has its own zoning districts, including single-family, mixed residential, manufactured-home, commercial and manufacturing districts.5 In Alton’s R-2 Single-Family Residential District, the minimum lot size is 6,000 square feet for uses other than single-family attached; the attached-use minimum is 4,500 square feet.12 The R-2 table requires a 30-foot front yard, 15-foot street-side yard, 5-foot side yard and 25-foot rear yard; single-family attached uses require only one side yard.13 These are R-2 requirements, so ask the Alton Zoning Administrator to identify the parcel’s district before drawing a footprint.131 Alton also regulates subdivisions and requires adequate sanitary-sewer provisions for subdivision approval.14

How do sewer connections and septic permits work in Alton?

Alton requires an owner-funded sewer connection when occupied or otherwise qualifying property abuts a street, alley, right-of-way or easement containing an available public sewer within 200 feet of the property line; connection is due within 90 days after official notice.2 Madison County Planning & Development permits and inspects private sewage systems, allowing them only where public sewer is unavailable and cannot be extended to the property line and acceptable soils are present.3 Call the county private-sewage office at (618)296-4663 before assuming a septic system is an alternative to sewer.3 Illinois requires plan approval before new private-sewage construction and at least 48 hours’ notice before covered work begins.15

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

We could not confirm Alton’s private-lot RV occupancy or temporary-camping rule; ask the Alton Zoning Administrator about living in a camper while building before relying on that arrangement.1 Alton’s dwelling-size rule requires at least 800 square feet of habitable area and a footprint of at least 600 square feet for individual dwelling units subject to the adopted residential code.4 A tiny-home proposal must therefore address those minimums; we could not confirm a separate tiny-home or accessory-dwelling provision, so take the proposed size and use to the city office.41 Illinois’s qualifying owner-occupant plumbing exemption does not establish a general exemption from local building permits or construction codes.6

What are the steps for building a home in Alton?

  1. Ask the Alton Zoning Administrator to confirm the district and review the proposed use and layout against the applicable zoning requirements.15
  2. Establish the sewer-connection requirement with the city; if private sewage is proposed, obtain Madison County’s system review and permit before installation.23
  3. Submit the city building-permit application and plans for review, and identify the electrical and plumbing applications needed for the project.1
  4. Arrange required construction inspections with Alton’s building official and leave required portions exposed until inspection and approval.16
  5. Apply for and receive Alton’s certificate of occupancy before occupying a newly constructed or covered remodeled building; issuance requires satisfactory proof or inspection of building and zoning compliance.17

What should you check before buying land in Alton?

For a private-water proposal in Alton, Madison County’s well ordinance requires a Health Department permit before construction or deepening and sets a non-refundable $100 water-well permit fee.8 Ask Madison County Health Department about the parcel and application requirements.8 Illinois floodway construction can require IDNR authorization; ask the Alton building office to identify the local floodplain review needed for your proposed site.181 Work within a state-maintained roadway right-of-way, including state-highway driveway access, requires an IDOT permit before work begins.19 We could not confirm Alton’s ordinary city-street driveway approval procedure; ask the city building office to direct the access review.1

Watch-outs

  • A small Alton dwelling must meet the applicable 800-square-foot habitable-area and 600-square-foot footprint minimums.4
  • A compost toilet does not eliminate Illinois’s requirement to dispose of other domestic wastes through a conventional private sewage disposal system.20
  • We could not confirm an Alton agricultural-building or general owner-builder exemption; ask the city Code Enforcement Office before treating a project as exempt.1

Sources

  1. Alton Code Enforcement Office — Building and Zoning (cityofaltonil.gov)
  2. 6-10-2: Connection to Public Sewer Required (Alton), quoted and re-checked
  3. Madison County Planning & Development — Private Sewage Permits & Inspections (madisoncountyil.gov)
  4. 9-1-3: Amendments to Building Codes (Alton), quoted and re-checked
  5. Chapter 5 District Regulations (Alton), quoted and re-checked
  6. HB5913 Enrolled — Illinois Plumbing License Law amendment (Illinois statewide rule), quoted and re-checked
  7. 225 ILCS 320/18 — Local regulation; Department standards (Illinois statewide rule), quoted and re-checked
  8. Madison County water well ordinance, quoted and re-checked
  9. 9-1-1: Official Building Code (Alton), quoted and re-checked
  10. 9-1-2: Building Permits; Fees (Alton), quoted and re-checked
  11. Building Permits & Inspections (2026 county census)
  12. 11-5-3: R-2, Single-Family Residential District (Alton), quoted and re-checked
  13. 11-5-3: R-2, Single-Family Residential District (Alton), quoted and re-checked
  14. 12-1-1: Title (Alton), quoted and re-checked
  15. 77 Ill. Adm. Code 905.190 Installation Approval (Illinois statewide rule), quoted and re-checked
  16. 9-1-3: Amendments to Building Codes (Alton), quoted and re-checked
  17. 9-1-3: Amendments to Building Codes (Alton), quoted and re-checked
  18. Permit Program (Illinois statewide rule), quoted and re-checked
  19. Highway Permits (Illinois statewide rule), quoted and re-checked
  20. 77 Ill. Adm. Code 905.130 Human Waste Disposal (Illinois statewide rule), quoted and re-checked

Written October 12, 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 Alton

Alton’s own rules

  • Building code adoptedAdopted

    Building construction inside Alton city limits.

    • Adopted codes include 2021 ICC International Building, Existing Building, Fire, Mechanical, Property Maintenance, and Residential Codes; 2020 National Electrical Code; 2015 Life Safety Code; and 2014 Illinois Plumbing Code.
    “There is hereby adopted as the Building Code of the City, the following codes: ICC International Building Code | 2021 edition ICC International Existing Building Code | 2021 edition ICC International Fire Code | 2021 edition”
  • InspectionsRequired

    Construction and covered work inside Alton city limits.

    • The building official may require inspections as necessary or upon notification by the permit holder or agent.
    • Required portions may not be covered until inspection and approval.
    “From time to time the building official, as he deems necessary, or upon notification from the permit holder or his agent, shall make or cause to be made any necessary inspections and shall either approve that portion of the construction as completed or shall notify the permit holder or his agent wherein he fails to comply with this code.”
  • Certificate of occupancyRequired

    Buildings or structures constructed or remodeled after March 27, 1974, inside Alton city limits.

    • Application and an executed certificate are required before occupancy.
    • After completion, the owner or representative must file the assessor receipt with the building official within five days, excluding Saturdays, Sundays, and holidays.
    • Issuance requires satisfactory proof or inspection that building and zoning requirements are met.
    “It shall be unlawful to occupy any building or structure constructed or remodeled after March 27, 1974, without first having made application for and received an executed certificate of occupancy as hereinafter provided.”
  • Zoning districtsPublished

    Zoning districts inside Alton city limits.

    • Published districts include CR, R-1, R-2, R-3, R-4, R-6, HE, MED, C-1, C-2, C-4, C-5, MR, MUT, M-1, M-2, M-3, and M-4.
    “11-5-2: R-1, Single-Family Residential District 11-5-3: R-2, Single-Family Residential District 11-5-4: R-3, Mixed Single-Family Residential District 11-5-5: R-4, Multiple-Family Residential District 11-5-6: R-6, Manufactured Home Residential District”
  • Minimum dwelling sizeSpecified

    Individual dwelling units inside Alton city limits subject to the adopted residential code.

    • The habitable area must be at least 800 square feet.
    • The footprint must be at least 600 square feet.
    • The minimum horizontal dimension must be at least 30 percent of the perpendicular horizontal dimension.

    minimum habitable area: >= 800 square feet · minimum footprint: >= 600 square feet · minimum horizontal dimension ratio: >= 30 percent

    “The minimum overall size of the habitable area of an individual dwelling unit shall be 800 square feet. The minimum footprint size shall be not less than 600 (six hundred) square feet. The minimum horizontal dimension of a dwelling unit shall not be less than 30 (thirty) percent of the horizontal dimension perpendicular to it.”
  • Mandatory utility hookupSewer (with conditions)

    Property used for human occupancy, employment, recreation, or another purpose inside Alton city limits when an available public or sanitary or combined sewer is located in the abutting street, alley, right-of-way, or easement and is within 200 feet of the property line.

    • Connection is at the owner's expense.
    • Connection must occur within 90 days after official notice.
    • A previously used lateral may serve new facilities only with a special variance from the City Plumbing Inspector and a recorded Madison County disclosure.

    maximum sewer distance from property line: <= 200 feet · connection deadline after official notice: 90 days

    “The owner of any house, building, structure or property used for human occupancy, employment, recreation or other purpose, within the City which abuts on any street, alley, right of way or public easement in which there is located or may in the future be located, an available public or sanitary or combined sewer in the City, is required hereby at his expense to install suitable toilet facilities therein, and to connect such facilities directly with such public sewer, in accordance with the provisions of this chapter, within ninety (90) days after date of official notice to do so, provided that said public sewer is within two hundred feet (200') of such owner's property line.”
  • Subdividing landRegulated (with conditions)

    Land subdivision inside Alton city limits.

    • The city's Land Subdivision Ordinance applies.
    • Subdivision approval requires adequate sanitary-sewer provisions.
    “No subdivision shall be approved unless provision is made for the construction of a sanitary sewer system that is adequate to serve the needs of the entire subdivision when fully developed.”
  • Permit feesPublished (with conditions)

    Alton building, demolition, electrical, plumbing, solar, fence, sign, and reinspection permits.

    • Published fees include residential and commercial distinctions and additional-thousand-dollar charges for several permit categories.
    • Fees are waived for qualifying Piasa Area Habitat for Humanity and Christmas in April properties, but those organizations must still obtain appropriate permits.

    residential mechanical and plumbing permit fee: 50 USD · residential fence permit fee: 50 USD · reinspection fee: 35 USD · accessory-structure demolition permit fee: 75 USD · residential dwelling or commercial building demolition permit fee: 100 USD

    “The fees for building permits issued for the erection, construction, alterations, repairs or removal of any wall, fence, building or structure, or part thereof, shall be as hereinafter provided:”

Rules another office applies inside Alton

Alton 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

    R-2 Single-Family Residential District inside Alton city limits.

    • Single-family attached uses have a separate 4,500-square-foot minimum.

    minimum lot size: >= 6000 square feet (4,500 square feet for single-family attached only)

    “Minimum lot size | 6,000 square feet (all uses except single- family attached) | 4,500 square feet for single-family attached only”
  • SetbacksSpecified

    R-2 Single-Family Residential District inside Alton city limits.

    • The district table separately provides street-side, side-yard, front-yard, and rear-yard requirements.
    • Single-family attached uses have a special side-yard rule.

    minimum front yard: >= 30 feet · minimum street side yard: >= 15 feet · minimum side yard: >= 5 feet (For single-family attached only one side yard is required) · minimum rear yard: >= 25 feet

    “Minimum front yard | 30 feet Minimum street side yard | 15 feet Minimum side yard | 5 feet (all uses except single-family attached) for single-family attached only 1 side yard is required Minimum rear yard | 25 feet”

Still unanswered

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

  • Owner-builder exemption — Owner-builders seeking exemption from Alton building permits or code requirements.
  • Lot coverage — Lot coverage inside Alton city limits, including the principal single-family residential district.
  • Living in an RV — RV occupancy on private land inside Alton city limits.
  • Camping on your land — Temporary camping on land inside Alton city limits.
  • Tiny homes — Tiny-home occupancy inside Alton city limits.
7 more unanswered
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Driveway access

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 Alton publishes no rule on the point, not that none exists. Madison County’s page lists the county offices to call.

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