Troy, Missouri Building Permit Guide

Inside Troy city limits, building permits come from the City’s Building Department, where the Building Commissioner enforces the building code; its SmartGov portal shows applications and inspection results (support 636-528-1254, building@cityoftroymissouri.com). Under Table I of the City Code a house up to 2,500 sq ft costs $0.51 per square foot plus a $50 plan review fee, so 2,000 sq ft is $1,070 before the $525 water and $4,000 sewer connection fees.

What requires a building permit in Troy?

City Code Section 405.670 makes it unlawful to build, rebuild, convert, alter, enlarge, extend, raise or move any building or structure without first applying to the Building Commissioner and receiving a building permit. Table I of the City Code also prices separate permits for:

Basement homes (all four walls concrete, more than half below grade, with a flat roof) are banned in Troy, and earth-contact homes need a pitched roof, at least one wall above grade and plan approval by the City Engineer.

Troy building department: who handles permitting

The Building Commissioner, designated by the Mayor, receives building permit applications, issues permits and certificates of occupancy and enforces the Troy Building Code; the City Building Official is also the floodplain administrator. The City Engineer is the Administrative Officer of the zoning ordinance, who checks zoning compliance and sends variance requests to the Board of Adjustment. The City permits only land inside its limits, in Lincoln County.

The City warns that it never asks for payment by wire transfer; treat any such request as a scam.

Troy applications and contractor licences

Applications go to the Building Commissioner in writing with a detailed set of plans in duplicate, showing the size of the building, its position on the lot, its materials and the type of construction; one set stays with the City and one is returned. Applicants track applications and inspection results in the SmartGov portal, which also posts a deck guide and the City’s refund policy. Under the City Code, information entered in a permit application is public under the Missouri Sunshine Law, although card details and personal contact information may be redacted.

Contractor licences: building and general contractors need a City business licence, $15 a year, which runs to the last day of August. Paid fees are not transferred or refunded without the Board of Aldermen’s consent, and when the City orders a third-party engineering review the applicant reimburses its cost.

Troy permit fees

Fees are set in Table I to Title IV of the City Code, last amended by Ordinance 1401 on November 17, 2025. The minimum fee for any Building Department permit is $50.

Each band’s rate applies to the whole floor area, and the bands do not join up (2,500 sq ft costs $1,275 at $0.51, while 2,501 sq ft costs about $1,225 at $0.49), so work out the fee in the band your project falls in. A 2,000 sq ft house pays $1,020 plus the $50 plan review fee. The water and sewer right-to-connect fees are paid before the connection is made; the City supplies the water meter and the contractor supplies the other materials. A drainage permit for a single-family lot under 2 acres is $25, a rezoning application $200 and a conditional use permit $150.

Electrical, plumbing and mechanical codes in Troy

Troy enforces the 2014 National Electrical Code and the 2015 International Plumbing, Mechanical and Fuel Gas codes; their permit fees follow Table I. Under the City’s plumbing amendments, building sewers must be at least 30 in deep and roof vents must extend 12 in above the roof, and work carried on without a required inspection is an offense with a $500 fine. Meter bases are permitted at $50.

Alliance handles electrical permit filing for contractors here. More on this: who pulls the electrical permit.

How to get a Troy building permit

Troy inspections and occupancy

Inspection results are posted to each applicant’s SmartGov account. Table I sets a $50 fee for a second re-inspection, and proceeding with work without a required inspection costs $500. No new building may be occupied, and no change of use in an existing building other than a single-family home may be made, until the Building Commissioner issues a certificate of occupancy, and lots must be seeded and mulched or sodded before an occupancy permit is issued. A permit expires if construction does not start within 6 months or is not completed within 2 years of issue.

A City land disturbance permit makes the developer inspect erosion controls at least every 7 calendar days and after rainfall that causes runoff, and grading that stops for more than 30 days must be covered with permanent grass. Applying for a grading or building permit also gives the City consent to inspect the site.

Floodplain rules and the data center moratorium

Floodplain: Troy takes part in the National Flood Insurance Program, and FEMA lists its current flood map date as October 5, 2018. Chapter 420 of the City Code applies to the A and AE zones on the Lincoln County flood maps (panels dated October 5, 2018 and September 29, 2010) and is administered by the City Building Official. New or substantially improved homes must have the lowest floor, including any basement, 3 ft above the base flood elevation; commercial and other non-residential buildings must be 3 ft above it or floodproofed. A floodplain development permit costs $75.

Radon: since Ordinance 1413 (March 16, 2026), Troy’s residential code includes Appendix F, radon control methods, for new homes.

Troy building codes

Chapter 500 of the Troy City Code adopts the 2015 International Building, Residential, Plumbing, Mechanical, Fuel Gas, Energy Conservation and Swimming Pool and Spa codes and the 2014 National Electrical Code, in force since September 1, 2016 (Ordinance 1223). Townhouses must have fire sprinklers, and builders of one- and two-family homes must offer buyers the option of sprinklers. Appendix F (radon control) was added on March 16, 2026.

Missouri has no mandatory statewide building code for private construction: a county, fire protection district or municipality may adopt one (usually by reference under RSMo 67.280), and in parts of the state none has. Building codes in Missouri

Troy permit FAQ

Who issues building permits in Troy, Missouri?

The City of Troy Building Department, where the Building Commissioner enforces the building code; follow applications in the City’s SmartGov portal (support 636-528-1254).

How much is a building permit for a new house in Troy?

$0.51 per square foot up to 2,500 sq ft, plus a $50 plan review fee: $1,070 for 2,000 sq ft, before water and sewer connection fees.

Do I need a permit for a deck or a pool?

Yes. Decks, pools, spas, hot tubs and basement finishes each take a $50 permit.

How high must a new home be built in the floodplain?

The lowest floor, including any basement, must be 3 ft above the base flood elevation.

How long is a Troy building permit valid?

Work must start within 6 months and be completed within 2 years of issue.

Can I get a permit for a data center?

Not while the 120-day moratorium adopted on August 17, 2026 is in force (through about mid-December 2026).

Troy permit search and official resources

These are the primary sources behind this guide. Codes, fee schedules and procedures change — confirm the position for your filing date.

• Troy SmartGov public portal
• Troy City Code Table I, building and connection fees
• Troy City Code Chapter 500, Building Regulations
• Troy City Code, planning administration and building permits
• Troy City Code Chapter 420, Floodplain Management
• Troy City Code Chapter 525, Erosion and Sedimentation Control
• Troy Ordinance 1439, data center moratorium (August 17, 2026)
• Troy Ordinance 1413, radon control appendix (March 16, 2026)

Simplify Troy permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Missouri. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Troy permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.