St. Charles County
St. Charles County Division of Building and Code Enforcement
In short
St. Charles County Division of Building and Code Enforcement issues 6 permits we publish for St. Charles County, last verified 2026-10-05. Each carries the fee as the agency publishes it, with a link to the schedule it was read from.
What this agency issues
| Permit | Issuing agency | Fee | Renews | Last checked |
|---|---|---|---|---|
| Plumbing Contractor Business License | St. Charles County Division of Building and Code Enforcement | $200 active-status fee per license for a two-year term; $25 initial application fee and $50 inactive-status fee | two-year terms beginning January 1 of even-numbered years | 2026-10-05 |
| Mechanical Contractor Business License (Class A or Class B) | St. Charles County Division of Building and Code Enforcement | $200 active-status fee per Class A or Class B license for a two-year term; $25 initial application fee and $50 inactive-status fee | two-year terms beginning January 1 of even-numbered years | 2026-10-05 |
| Electrical Contractor Business License | St. Charles County Division of Building and Code Enforcement | $200 active-status fee per license for a two-year term; $25 initial application fee and $50 inactive-status fee | two-year terms beginning January 1 of even-numbered years | 2026-10-05 |
| On-Site Wastewater Treatment System Installer Business License | St. Charles County Division of Building and Code Enforcement | $200 active-status fee per license for a two-year term; $25 initial application fee and $50 inactive-status fee | two-year terms beginning January 1 of even-numbered years | 2026-10-05 |
| Pool Installer Business License | St. Charles County Division of Building and Code Enforcement | $200 active-status fee per license for a two-year term; $25 initial application fee and $50 inactive-status fee | two-year terms beginning January 1 of even-numbered years | 2026-10-05 |
| On-Site Wastewater Treatment System Inspector Business License | St. Charles County Division of Building and Code Enforcement | $200 active-status fee per license for a two-year term; $25 initial application fee and $50 inactive-status fee | two-year terms beginning January 1 of even-numbered years | 2026-10-05 |
Fees shown as a range or formula are set that way by the issuing agency — we do not average them into a single number.
About each permit
Plumbing Contractor Business License
Chapter 625 of the St. Charles County Code requires a licensed plumbing contractor to hold a county business license. The initial application fee is $25, the active-status fee is $200 per license for a two-year term, and the inactive-status fee is $50 to renew a license in inactive status for two years. Two-year terms begin on the first day of January in even-numbered years and end on the last day of December in the following odd-numbered year. The license covers work in unincorporated St. Charles County and in any incorporated area whose governing body has consented to contract with the County to enforce the Code standard. The Division of Building and Code Enforcement administers it.
Mechanical Contractor Business License (Class A or Class B)
Chapter 633 of the St. Charles County Code, titled Mechanical Contractor Business License, sets a $25 initial application fee and a $200 active-status fee for each Class A or Class B license, for a two-year term. The inactive-status fee is $50 to renew a Class A or Class B license in inactive status for two years. Two-year terms begin on the first day of January in even-numbered years. The license covers work in unincorporated St. Charles County and in any incorporated area whose governing body has consented to contract with the County to enforce the Code standard. The Division of Building and Code Enforcement administers it, and the record is tagged contractor because the chapter licenses mechanical contractors.
Electrical Contractor Business License
Chapter 630 of the St. Charles County Code, titled Electrical Contractor Business License, requires a licensed electrical contractor to hold a county business license. The initial application fee is $25, the active-status fee is $200 per license for a two-year term, and the inactive-status fee is $50 to renew a license in inactive status for two years. Two-year terms begin on the first day of January in even-numbered years. The license covers work in unincorporated St. Charles County and in any incorporated area whose governing body has consented to contract with the County to enforce the Code standard. The Division of Building and Code Enforcement administers it.
On-Site Wastewater Treatment System Installer Business License
Chapter 627 of the St. Charles County Code, titled On-Site Wastewater Treatment System Installer Business License, sets a $25 initial application fee and a $200 active-status fee per license for a two-year term. The inactive-status fee is $50 to renew a license in inactive status for two years. The chapter requires applicants to furnish proof of registration as an On-Site Wastewater Treatment System Installer or an On-Site Sewage Disposal System Contractor, and the record is tagged contractor on that basis. The license covers work in unincorporated St. Charles County and in any incorporated area whose governing body has consented to contract with the County to enforce the Code standard. Two-year terms begin on the first day of January in even-numbered years.
Pool Installer Business License
Chapter 632 of the St. Charles County Code, titled Pool Installer Business License, sets a $25 initial application fee and a $200 active-status fee per license for a two-year term. The inactive-status fee is $50 to renew a license in inactive status for two years. The chapter requires each licensee to keep a contractor license bond of $20,000 on file with the Code Official, and the record is tagged contractor on that basis. Two-year terms begin on the first day of January in even-numbered years. The Division of Building and Code Enforcement administers the license.
On-Site Wastewater Treatment System Inspector Business License
Chapter 626 of the St. Charles County Code, titled On-Site Wastewater Treatment System Inspector Business License, sets a $25 initial application fee and a $200 active-status fee per license for a two-year term. The inactive-status fee is $50 to renew a license in inactive status for two years. The chapter requires each licensee to keep a contractor license bond of $10,000 on file with the Code Official, and the record is tagged contractor on that basis. Two-year terms begin on the first day of January in even-numbered years. The Division of Building and Code Enforcement administers the license.
Contact
- Jurisdiction
- St. Charles County
- Phone
- Not verified — use the website
Contact details are taken from the agency’s own site or its published fee schedule. Where we have not verified a phone number we leave it blank rather than guess.
Sources
Every fee and term above was read from one of these government pages on the date shown.
- St. Charles County Code, Chapter 625: Plumbing Contractor Business LicenseSt. Charles County, Missouri (eCode360, ST3436) · primary source · retrieved 2026-10-05
- St. Charles County Code, Chapter 626: On-Site Wastewater Treatment System Inspector Business LicenseSt. Charles County, Missouri (eCode360, ST3436) · primary source · retrieved 2026-10-05
- St. Charles County Code, Chapter 627: On-Site Wastewater Treatment System Installer Business LicenseSt. Charles County, Missouri (eCode360, ST3436) · primary source · retrieved 2026-10-05
- St. Charles County Code, Chapter 630: Electrical Contractor Business LicenseSt. Charles County, Missouri (eCode360, ST3436) · primary source · retrieved 2026-10-05
- St. Charles County Code, Chapter 632: Pool Installer Business LicenseSt. Charles County, Missouri (eCode360, ST3436) · primary source · retrieved 2026-10-05
- St. Charles County Code, Chapter 633: Mechanical Contractor Business LicenseSt. Charles County, Missouri (eCode360, ST3436) · primary source · retrieved 2026-10-05
Other offices serving St. Charles County
The full permit list for this jurisdiction
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