Dardenne Prairie, Missouri Building Permit Guide

In Dardenne Prairie, the City’s Building & Code Enforcement department reviews site and building plans and issues construction permits; St. Charles County does not issue building permits inside the city. New buildings pay 0.45% of the International Code Council building valuation plus 0.15% for plan review, while common home projects such as decks, basement finishes and pools have flat fees of $50–$150.

What requires a building permit in Dardenne Prairie?

City Code Section 500.030 requires a building permit for all building activity except ordinary repairs and the work listed as exempt in the building code. The City’s fee schedule shows the permits it issues:

Under the City’s building code amendments, retaining walls up to 4 feet high, measured from the bottom of the footing, are exempt unless they support a surcharge or impound flammable liquids; the fee schedule charges $75 for walls 4 feet or higher. Land disturbance of 5,000 sq ft or more needs a land disturbance permit; under one acre it can be included in the building permit, and over one acre it is a separate application.

Dardenne Prairie building department: who handles permitting

The Department of Building and Codes has a Building Division, which reviews residential and commercial site and building plans, issues construction permits and inspects work for building, energy, mechanical, drainage, erosion control, plumbing, electrical and zoning compliance up to the final certificate of occupancy, and a Code Enforcement Division for property maintenance and zoning. Zoning and conditional use questions go to the City Engineer.

The application forms ask for the general contractor and the electrical contractor with licence numbers, and any change of subcontractor after the permit is issued must be reported in writing with a $50 transfer fee. Fire protection districts may require their own permit, and the City’s forms tell applicants to check with the fire district.

Dardenne Prairie permit applications

The City publishes three application forms on its Permits & Licenses page:

• Residential New Construction: new houses, room additions, garages, accessory buildings and repair or remodel work, with occupancy, utility and floor-area details.
• Residential Updates: basement finishes, decks and porches, porch roofs, pools, hot tubs and spas, fences and retaining walls.
• Commercial Building & Occupancy: new construction, additions, alterations and trade-only work, plus change of occupant; a Dardenne Prairie business licence is also required.

The page also has fence, deck, retaining wall and pool guidelines and the Health and Safety Occupancy application. Applications are filed with the department at City Hall. The City Administrator reported on September 2, 2026 that new permitting software, Concourse, was about to start user testing with staff.

Dardenne Prairie permit fees

Fees are set in City Code Section 500.170 (Ordinance 2281, December 20, 2023). New residential and commercial buildings and new commercial additions are charged on the most recent International Code Council Building Valuation Data, which the City adopts:

For example, a new house with a building valuation of $400,000 pays a $1,800 permit fee and a $600 plan review fee.

Each fee covers the first inspection and one re-inspection; further re-inspections cost $35 each. Combined building, plumbing, electrical and mechanical permits are charged as the total of each part. All fees are paid before the permit is issued. The City’s web fee list shows $150 for a retaining wall of 4 feet or more, but the adopted code and the Residential Updates form charge $75.

Electrical, plumbing and mechanical work in Dardenne Prairie

The City enforces its own electrical, plumbing, mechanical and fuel gas codes: the 2020 National Electrical Code and the 2021 International Plumbing, Mechanical and Fuel Gas Codes, as amended. Commercial mechanical-only, electrical-only and plumbing-only permits are filed on the Commercial Building & Occupancy form; an electrical service upgrade at a house is a $75 permit.

Private septic systems fall under the City’s adopted 2021 International Private Sewage Disposal Code, and a septic permit costs $150. Before a property on a septic system or private well is sold, the seller must have it inspected by a third-party inspector licensed by St. Charles County and fix any violations, or the buyer must accept them in a signed affidavit backed by an escrow.

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

Application documents

Commercial and multi-family plans must carry a Missouri engineer’s or architect’s seal.

How to apply for a Dardenne Prairie building permit

Dardenne Prairie inspections

Once the permit is issued, schedule inspections by calling the Building & Codes Department at 636-755-5301 or in person at City Hall, with the permit number from the top of the permit. Inspections run Monday to Friday from 10 a.m. to 4 p.m. and are typically booked 48 hours ahead.

No pool may be used until its permanent barrier is installed and the City gives final approval.

Local Dardenne Prairie rules

Health and safety occupancy permit: no one may occupy a dwelling unit until the City issues a life, health and safety occupancy certificate. The application is required for a sale, rental or lease, costs $75 (cash or check), and there is no re-inspection fee. Chapter 525 does not apply to a change of ownership within a family with no change of occupant, or to a buyer who files a notarized statement that the building will be demolished within six months, and the Director may waive the inspection where a unit has at least a six-month history of compliance and was last inspected recently, generally within six months. Inspectors check items such as working, interconnected smoke detectors, GFCI outlets, a dedicated sump pump outlet, bathroom fans and range anti-tip devices.

Floodplain: the City is in the National Flood Insurance Program on flood maps dated January 20, 2016. The City Engineer is the floodplain administrator; a floodplain development permit is required for development in the mapped flood zones, and new or substantially improved homes need the lowest floor at least 1 foot above base flood elevation.

Energy code: the City’s code page lists the 2015 International Energy Conservation Code. Section 500.140 of the City Code adopts the 2021 IECC, but the City’s building code amendments send all energy references to the 2015 edition, so ask the department which edition your plans must show.

Missouri building code

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

Dardenne Prairie permit FAQ

Does St. Charles County issue building permits in Dardenne Prairie?

No. The City’s Building & Code Enforcement department issues residential and commercial building permits inside city limits.

How much is a building permit for a new house?

0.45% of the ICC building valuation for the permit plus 0.15% for plan review (at least $250). A house valued at $400,000 pays $1,800 plus $600.

How much is a deck or basement finish permit?

$150 each, including one inspection and one re-inspection; extra re-inspections are $35.

Do I need a permit for a fence or retaining wall?

Yes for any fence ($50). Retaining walls need a permit ($75) when they are 4 feet or higher.

Do I need an inspection to sell or rent my home?

Yes. A $75 health and safety occupancy permit is required for a sale, rental or lease, with narrow exceptions in the City Code such as a family transfer with no change of occupant.

How do I schedule an inspection?

Call 636-755-5301 or visit City Hall, usually 48 hours ahead, between 10 a.m. and 4 p.m. on weekdays.

Dardenne Prairie 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.

• Dardenne Prairie Building & Code Enforcement
• Dardenne Prairie permit applications and common fees
• Dardenne Prairie current building codes
• Dardenne Prairie: schedule an inspection
• Residential New Construction permit application
• Residential Updates permit application
• Health and Safety Occupancy Permit application (2026)
• Dardenne Prairie Code Section 500.170, permit and plan review fees
• Dardenne Prairie Code Chapter 525, occupancy permits
• Dardenne Prairie Code Chapter 415, flood hazard prevention

Simplify Dardenne Prairie 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 Dardenne Prairie permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.