Residential Site Development Process

A site development plan shows how a new home will be built on a lot. It includes things like building location, driveways, utilities, grading, and sidewalks. The City reviews the plan to make sure it meets local rules before construction begins.

You need a site development plan before building a new single-family home in the “A” Single-Family Dwelling District.

You do not need a site development plan if you are:

• Remodeling an existing home
• Expanding or adding onto an existing home
• Making interior or structural changes to an existing home

* Municipal zoning approval from Twin Oaks and building permits from St. Louis County are still required for remodeling, additions, interior updates

The plan must be prepared by a licensed architect, engineer, or land surveyor. Homeowners typically hire a professional to handle this step.

You submit:

• A completed site development plan application
• The required plans and documents

All materials are submitted to the City Administrator/Clerk.

The minimum time to receive approval is about 6–8 weeks, assuming your application is complete and no revisions are required. Delays are typically a result of incomplete applications.

1. Engineering Review – City engineers review the plans (about 2 weeks)
2. Planning & Zoning Review – The Commission reviews the project (2–4 weeks)
3. Public Hearing – The Board of Aldermen holds a public hearing and makes the final decision (minimum 15 days for public notice)

The public hearing allows residents to learn about proposed development and provide comments before the City makes a final decision.

Yes. If City staff or boards identify issues, you may be asked to revise your plans. This will extend the approval timeline.

You may apply for a building permit after the Board of Aldermen approves your site development plan.

A land disturbance permit for site work or grading may be issued before final approval if authorized by the Board of Aldermen. No building construction or land disturbance may begin without approval.

• You may move forward with building permits
• Construction must begin within 6 months of approval

The approval expires, and you will need to go through the site development plan approval process again.

No. Approval only applies to uses already permitted in the “A” Single-Family Dwelling District.