Master Plan Permit

What is a Master Plan Permit?

A master plan permit is used by developers to "master" a set of plans so when a contractor is ready to build such a plan, review time is cut to approximately three business days. Nearly any project can be mastered if the developer plans on building the project multiple times. Typical master plans include projects such as single-family detached residences and swimming pools.

Community Development will master a plan at no charge. However, at least one planned permit to be used off the master plan must be ready to submit at the time the master plan is approved.

How Do I Apply?

To apply for a residential building permit, please visit the Building Construction Permit section of our Citizenserve Citizen Access Portal.

What Will I Need to Submit?

  • Building plans (PDF format preferred) showing footing/foundation detail, framing member sizes, header sizes, door and window locations and sizes, truss or rafter design, flooring detail, and any electrical or plumbing. Also include floor plan, wall cut detail, elevations and any applicable stair details.
  • A detailed plot plan (PDF) showing the location of your home and proposed building or structure on the lot. Show distances to property lines and keep in mind that structures may not be located over easements or septic systems.
  • Estimated cost of construction

Fees and Plan Review

For a new master plan, the plan review process typically takes about 10 working days. If you have previously mastered this plan with Community Development but are re-submitting due to code year change, typical plan review time is three working days. When the permit is approved, you will be notified via email and your first permit from this master plan then can be applied for under either a residential or commercial building permit as applicable.


At least one inspection is required. When the permit is issued, the necessary inspections required will be listed on your permit card. At the inspector's discretion, some inspections may not be applicable to the particular permit in question. The inspector will note those inspections are "N/A" at a later date.

Inspections must be called in the Community Development office by 5 p.m. the business day prior to your requested inspection date. To schedule your inspection, call 636-949-7345. If it is necessary to cancel or change your inspection, please do so as soon as possible. Also, please remember to post your permit so that it is visible from the street.


If you have any questions, please contact the St. Charles County Building and Code Enforcement Division at 636-949-7345.