Zoning, building permits and septic rules in Troy, Illinois

Troy’s own rules

• Building permitRequired

  New construction, additions, renovations and structural changes inside Troy city limits

  • Permit types on the city page include commercial building permit (new construction and additions), residential building permit (new construction, additions, garages), residential remodel permit, limited use permit (carports, decks, demolition, electric service upgrades, pools/hot tubs, roof coverings over decks, season rooms without heating/AC, sheds, solar installations) and mobile home permit.
  • Permit applications are submitted to [email protected] according to the city page.

  “building permits are needed for all new construction, additions, renovations, and structural changes.”

• Building code adoptedAdopted

  Construction inside Troy city limits

  • The city's notice says it has implemented new codes; the adopting ordinance is 2025-33 and the adopted list is a linked PDF that was not opened. Which specific codes (IBC/IRC/etc.) and the effective date were not confirmed.

  “ordinance 2025-33 (pdf) - adopting 2021 building and related codes”

• InspectionsRequired

  Permitted building work inside Troy city limits

  • Inspections must be requested 24 hours in advance per the city page ('all inspections are to be requested 24 hours in advance').
  • The list of required inspections is a linked PDF ('inspections (pdf)') that was not opened; which inspection types apply to which permits is not confirmed here.

  “all inspections are to be requested 24 hours in advance.”

• Local zoningPresent (with conditions)

  Land inside Troy city limits: Troy city administers its own Chapter 154 Zoning Ordinance

  • Chapter 154 (Zoning Ordinance) is part of the Troy, Illinois Code of Ordinances hosted by American Legal Publishing; section 154.002 is titled jurisdiction, but its text was not opened in this run.
  • Zoning-only topics for this municipality are answered from the Chapter 154 table of contents and remain largely unknown (see individual claims).

  “chapter 154: zoning ordinance editor's note: the zoning ordinance codified in full with the s-3 supplement was based upon ordinance 2004-21”

• Zoning districtsPublished

  Zoning districts and district map for land inside Troy city limits

  • The district schedule is section 154.032 (area and bulk regulations; parking) and 154.033 (permitted and special uses); their text was not opened.
  • The city site links a zoning map PDF on the Building Information page (not opened).

  “154.020 establishment of districts and zoning district regulations 154.021 zoning map and district boundaries”

• Subdividing landRegulated (with conditions)

  Division of land into lots inside Troy city limits

  • Chapter 153 is the Troy subdivision code; its requirements (plats, improvements, approvals) were not opened in this run.

  “chapter 152: mobile homes and mobile home parks chapter 153: subdivision code chapter 154: zoning ordinance general provisions”

• Permit processPartial

  Building permit submission and inspection requests inside Troy city limits

  • Process is partially published: the city lists permit applications and inspection forms as PDFs and gives a contact address and phone; the step-by-step process and fee schedule were not verified.
  • Building & Zoning office: 116 E Market Street, phone 618-667-8734 ext 4 (per the city page).

  “submit permits or request inspections via: [email protected].”

Still unanswered

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

• Owner-builder exemption — Owner-builder permit exemption inside Troy city limits
• Certificate of occupancy — Certificate of occupancy for new homes inside Troy city limits
• Minimum dwelling size — Minimum dwelling size in the main single-family residential district inside Troy city limits
• Minimum lot size — Minimum lot area for the main single-family residential district (R-1) inside Troy city limits
• Setbacks — Yard setbacks in the main single-family residential district inside Troy city limits

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.