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Permitting Authorities / City of Wentzville, Missouri - Building Division

Do you need a permit to replace a roof in Wentzville, MO?

Adopted code

City of Wentzville, Missouri - Building Division

The permitting authority for the City of Wentzville, Missouri (St. Charles County). The Building Division, within Community Development, administers the city's adopted 2021 International Residential Code and processes permits through the SmartGov portal (as of Feb. 2026).

Jurisdiction
City of Wentzville, Missouri
Jurisdiction type
city
Address
1001 Schroeder Creek Boulevard, Wentzville, MO 63385
Contact
  • url: https://www.wentzvillemo.gov/departments/community-development/building-division/building-permits/
  • phone: 636-327-5101
  • email: [email protected]
Contractor registration required
Required
Registration details
  • license: City of Wentzville Building Permits page: "All contractors, generals and subs, are required to have a City issued contractors license prior to performing work in the City, this is required to be renewed every year by February 28. If your contractor's license is not valid, please fill out the Contractors License application and submit as directed on the application to assure efficient permit review times." Administered by the City Clerk's office ((636) 327-5101). This is a general contractor's license required of all contractors (generals and subs) performing work in the city, not a roofing-specific trade license; no separate roofing-specific license category was found. Annual renewal deadline: February 28.
Permit process note
Sec. 500.070/500.080 (2021 IRC as amended) does not list "reroofing" or "re-covering of asphalt shingle roofs" among the R105.2 Work Exempt From Permit "Building" items (the amended list covers only: (1) small detached accessory structures =120 sq ft; (2) fences, which the city's amendment affirmatively states DO require a permit ["All fences require a permit"]; and (11) flatwork other than driveways). No City of Wentzville document was found that either explicitly requires or explicitly exempts a permit for asphalt-shingle re-roofing specifically -- the Building Division's own "Building Permits" page lists a non-exhaustive "Miscellaneous Permits" list (accessory building, deck/ patio cover, driveway, fence, finished basement, pool/hot tub, electric/ plumbing/HVAC, retaining walls over 4', sewer/water, solar, remodels, building additions) that does not include roofing/reroofing, but the page states this list "is not all encompassing." Separately, Resolution No. 23-1953 (10-25-2023) sets workmanship/matching standards for repairs to damaged siding and shingles (see roof_layer_limit note) but does not state a repair-size permit threshold. ESCALATION: roofing_permit_required and repair_permit_threshold are OMITTED for Wentzville rather than guessed -- recommend an architect browser pass to check the SmartGov permit-type list directly or call the Building Division (636-327-5101) to confirm whether asphalt-shingle re-roofing requires a permit.
Adopted code
International Residential Code (IRC), 2021 Edition, adopted by Sec. 500.070 of the Wentzville Municipal Code (Ord. No. 3689, repealed and replaced/most recently amended by Ord. No. 4460, § 1, 1-24-2024), with local amendments in Sec. 500.080 (most recently amended by the same ordinance, 1-24-2024). ESCALATION/EDITION FLAG: the city's separate Resolution No. 23-1953 (adopted 10-25-2023, "Regarding the Policy of the City of Wentzville, Missouri, on Workmanship, Siding Repairs, and Water Resistive Barriers") cites "the 2015 International Property Maintenance Code (IPMC) and the 2015 International Residential Code (IRC)" -- that resolution predates the city's 1-24-2024 adoption of the 2021 IRC/IPMC editions (Sec. 500.070/500.270) by about three months and has not been updated to reference the current editions, even though it remains in effect. Its substantive content (workmanlike-repair standard, damaged plane/elevation matching requirement, fastener specs) does not depend on edition-specific section numbers that are known to have changed, but the citation itself is stale.
Drip edge
Required — Sec. 500.080(34), amending IRC R905.2.8.5 Drip Edge (currently codified, 2021 IRC as amended, most recently amended 1-24-2024): "A drip edge shall be provided at eaves and rake edges of shingle roofs. Adjacent segments of drip edge shall be overlapped not less than 2 inches (51 mm). Drip edges shall extend not less than 1/4 inch (6.4 mm) below the roof sheathing and extend up back onto the roof deck not less than 2 inches (51 mm). Drip edges shall be mechanically fastened to the roof deck at not more than 12 inches (305 mm) o.c. with fasteners as specified in Section R905.2.5. Underlayment shall be installed over the drip edge along eaves and under the drip edge along rake edges. Exception: Unless the drip edge is specifically required by the manufacturer's installation instructions, metal wrapped fascia extending 1 inch under the roof covering with the underlayment installed over it shall be deemed to meet the requirements of this section." This is a local amendment (adds overlap/deck-extension detail and the fascia exception beyond stock IRC language) -- current and Wentzville-specific.
Ice & water shield
Not required — Sec. 500.080(9), amending Table R301.2(1) Climatic and Geographic Design Criteria (currently codified, 2021 IRC as amended, most recently amended 1-24-2024): row "Ice Barrier Underlayment Required" = "NO." Sourced directly from the city's own currently codified table, not from a separate guidance document.
Wind design criteria
115 mph wind speed, topographic effects NO, special wind region NO, windborne debris zone NO, Seismic Design Category C, ground snow load 20 psf, weathering SEVERE, frost line depth 30 inches, termite NO (Table R301.2(1) Climatic and Geographic Design Criteria, Sec. 500.080(9), currently codified 2021 IRC as amended, most recently amended 1-24-2024): table row reads "20 | 115 (51) | NO | NO | NO | C | SEVERE | 30 | NO | NO | TBD | 1000 | 55.2" across the columns Ground Snow Load, Wind Speed (mph), Topographic effects, Special wind region, Windborne debris zone, Seismic Design Category, Weathering, Frost line depth, Termite, Ice Barrier Underlayment Required, Flood Hazards, Air Freezing Index, Mean Annual Temp.
Sales & use tax
Base combined sales tax rate for Wentzville, Missouri (St. Charles County) is 8.4500% (Missouri DOR jurisdiction code 78442-183-000), per the DOR's statewide Sales/Use Tax Rate Table for July/August/September 2026 (updated 5/22/2026). Numerous stacked CIDs and TDDs push the combined rate substantially higher on specific parcels: e.g. Wentzville Bluffs CID (78442-183-002) and Wentzville Parkway Regional CID (78442-183-011) raise it to 9.4500%; Bear Creek CID + Wentzville Parkway Regional CID (78442-183-001) raises it to 9.9500%; the most heavily stacked parcels found, Crown TDD + Crown CID (78442-183-009) and Junction CID + Junction TDD (78442-183-010), each reach 10.4500%. Missouri's own Contractors Tax Matrix (DOR Audit Services, Industry Guidance, eff. 10-24-2022, https://dor.mo.gov/taxation/business/documents/Contractors_000.pdf) treats a roofing contractor as the final consumer of materials incorporated into real property: "Contractor sales of tangible personal property where title passed to the customer after installation" is listed Exempt, while "Tangible personal property to be sold as an attachment to real property" is listed Taxable -- meaning the contractor owes sales/use tax on shingles, underlayment, etc. at the point of purchase from the supplier, and does not separately charge the homeowner sales tax on the installed roof or on labor.

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Roofing questions — Wentzville, MO

Is ice & water shield required in Wentzville, MO?

Not required — Sec. 500.080(9), amending Table R301.2(1) Climatic and Geographic Design Criteria (currently codified, 2021 IRC as amended, most recently amended 1-24-2024): row "Ice Barrier Underlayment Required" = "NO." Sourced directly from the city's own currently codified table, not from a separate guidance document..

Is drip edge required?

Required — Sec. 500.080(34), amending IRC R905.2.8.5 Drip Edge (currently codified, 2021 IRC as amended, most recently amended 1-24-2024): "A drip edge shall be provided at eaves and rake edges of shingle roofs. Adjacent segments of drip edge shall be overlapped not less than 2 inches (51 mm). Drip edges shall extend not less than 1/4 inch (6.4 mm) below the roof sheathing and extend up back onto the roof deck not less than 2 inches (51 mm). Drip edges shall be mechanically fastened to the roof deck at not more than 12 inches (305 mm) o.c. with fasteners as specified in Section R905.2.5. Underlayment shall be installed over the drip edge along eaves and under the drip edge along rake edges. Exception: Unless the drip edge is specifically required by the manufacturer's installation instructions, metal wrapped fascia extending 1 inch under the roof covering with the underlayment installed over it shall be deemed to meet the requirements of this section." This is a local amendment (adds overlap/deck-extension detail and the fascia exception beyond stock IRC language) -- current and Wentzville-specific..

Do roofing contractors need a license or registration in Wentzville, MO?

Required. City of Wentzville Building Permits page: "All contractors, generals and subs, are required to have a City issued contractors license prior to performing work in the City, this is required to be renewed every year by February 28. If your contractor's license is not valid, please fill out the Contractors License application and submit as directed on the application to assure efficient permit review times." Administered by the City Clerk's office ((636) 327-5101). This is a general contractor's license required of all contractors (generals and subs) performing work in the city, not a roofing-specific trade license; no separate roofing-specific license category was found. Annual renewal deadline: February 28..

What building code does Wentzville, MO use?

International Residential Code (IRC), 2021 Edition, adopted by Sec. 500.070 of the Wentzville Municipal Code (Ord. No. 3689, repealed and replaced/most recently amended by Ord. No. 4460, § 1, 1-24-2024), with local amendments in Sec. 500.080 (most recently amended by the same ordinance, 1-24-2024). ESCALATION/EDITION FLAG: the city's separate Resolution No. 23-1953 (adopted 10-25-2023, "Regarding the Policy of the City of Wentzville, Missouri, on Workmanship, Siding Repairs, and Water Resistive Barriers") cites "the 2015 International Property Maintenance Code (IPMC) and the 2015 International Residential Code (IRC)" -- that resolution predates the city's 1-24-2024 adoption of the 2021 IRC/IPMC editions (Sec. 500.070/500.270) by about three months and has not been updated to reference the current editions, even though it remains in effect. Its substantive content (workmanlike-repair standard, damaged plane/elevation matching requirement, fastener specs) does not depend on edition-specific section numbers that are known to have changed, but the citation itself is stale.