Subdivision Improvement Plans

How Do I Submit Plans?

Please visit the Land Development & Zoning Applications Section of our Citizenserve Citizen Access Portal.

Submittal Requirements:

See below for additional construction, submittal and inspection information.

When Is a Plan Required?

A Subdivision Improvement Plan is required to be submitted and approved after preliminary plat approval and before the final plat can be recorded for residential, commercial, and industrial subdivision developments in accordance with Chapter 410 of the County Codes and the Design Criteria for the Preparation of Improvement Plans. A Land Disturbance-Major permit application will also be required in order to begin review of the Subdivision Improvement Plan.

A Flood Plain Development Permit application is also required where any portion of the project is located within the regulated flood plain.

Additional Construction, Submittal and Inspection Information

Subdivision Construction

Subdivision street construction shall be in accordance with the Standard Specifications for Subdivision Street Construction (PDF). Storm Sewer construction shall be in accordance with the Metropolitan St. Louis Sewer District’s Standard Construction Specifications for Sewers and Drainage Facilities, 2009. The St. Charles County Highway Department is responsible for the inspection of both private and public street and storm sewer construction and for any other construction proposed within the public right-of-way. The Development Review Division is responsible for the inspection of site grading and storm water detention and management facilities. All subdivision inspections will be coordinated through the Development Review Division.

Detention Basin & Stormwater Management Facility Maintenance Information

Performance Guaranty

Performance guaranty funds are required to be submitted in accordance with Section 410.180 of the County Codes before any final subdivision plats can be recorded. Funds must be sufficient to cover the costs of construction for the activities listed under Subdivision Construction.

Utility Construction

Construction of sanitary sewer, water, electric, gas, telephone, cable and any other utility are normally regulated by the utility service providers for the project area. Design approvals, fee collection, and construction inspections and approval must be arranged with the appropriate individual utility agencies. Contact the division if utilities will be provided and served by any other approved provider.

As-Built Plans and Final Inspections

Plans showing as-built locations, elevations, and volume of storm sewers and storm water detention and management facilities must be submitted for approval before the performance guaranty will be released and the improvements are accepted by the county. As-built plans must be sealed by a professional engineer or land surveyor registered in the State of Missouri.


Please contact the St. Charles County Development Review Division at 636-949-1814 or email Development Review.