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Permitting Authorities / City of St. Peters, Missouri - Building Department

Do you need a permit to replace a roof in St. Peters, MO?

Adopted code

City of St. Peters, Missouri - Building Department

No — St. Peters, MO does not require a permit for like-for-like roof replacement (City of St. Peters, Missouri - Building Department). City of St. Peters "Residential Re-Roofing Requirements" (Building Department, "Revised 3/27/2024"): reroofing of one- and two-family dwellings and townhouses is governed by IRC Section R908 Reroofing. "Even though a building permit is not required to re-roof structures, the code includes a provision that the work must still be done in a manner that is not in violation of the provisions of the code (Refer to IBC Section 105.2 that is referenced through the IRC adopting ordinance). This means that all reroofing projects must be installed in accordance with IRC Reroofing Section R908 even when a permit and inspection are not required." A permit IS required when sheathing replacement exceeds 25%, the covering material type is changed, or spaced-board gaps require panel sheathing overlay (see repair_permit_threshold).

Jurisdiction
City of St. Peters, Missouri
Jurisdiction type
city
Address
1 St. Peters Centre Boulevard, St. Peters, MO 63376
Contact
  • url: https://www.stpetersmo.net/163/Building-Safety
  • phone: 636-477-6600
Roofing permit required
Not required
Contractor registration required
Required
Registration details
  • license: City of St. Peters Code Section 605.005 (License Required): "No person shall be engaged in, prosecute or carry on any business, trade, profession, vocation or occupation, either in whole or in part, in the City by maintaining an office in the City or by soliciting orders through such office, or by any other manner whatsoever, without having first paid a license fee where applicable ... and having been issued a license/certificate when applicable ..., under the power of Section 94.270, RSMo." Exemptions are limited to: professions listed in Sections 71.620 and 71.630, RSMo. (state-law-exempt professions such as certain licensed professionals); businesses/occupations exempt by state law from license taxes; not-for-profit organizations; home-based businesses operating 7 days or less per calendar year; budget-funded agencies; and political/government agencies. Roofing/ general contractors are not among these exemptions, so a roofing contractor doing business in St. Peters is subject to the general business license requirement. This is a general business license, NOT a roofing- or construction-trade-specific license. Section 605.007(B) additionally requires "proof of a certificate of insurance for workers' compensation coverage if said applicant for license is required to cover his or her liability under Chapter 287.061, RSMo." as a condition of issuance. Fee schedule (Section 605.013): "General business (605.030) $50" per year. NOTE: separate county/state trade-license requirements apply specifically to mechanical, electrical, plumbing, and drainlaying contractors (via St. Charles County or State of Missouri, per city-code cross-references found in web search of the Mechanical/Electrical/Plumbing code chapters) -- roofing/general contractors are not named among those specifically trade-licensed categories; only the general business license was confirmed to apply.
Permit process note
City of St. Peters "Residential Re-Roofing Requirements" (Building Department, "Revised 3/27/2024"): reroofing of one- and two-family dwellings and townhouses is governed by IRC Section R908 Reroofing. "Even though a building permit is not required to re-roof structures, the code includes a provision that the work must still be done in a manner that is not in violation of the provisions of the code (Refer to IBC Section 105.2 that is referenced through the IRC adopting ordinance). This means that all reroofing projects must be installed in accordance with IRC Reroofing Section R908 even when a permit and inspection are not required." A permit IS required when sheathing replacement exceeds 25%, the covering material type is changed, or spaced-board gaps require panel sheathing overlay (see repair_permit_threshold).
Adopted code
International Residential Code (IRC), 2021 Edition, as amended, including Appendices AE, AK, AM, and AP, codified as Chapter 504 (Residential Code for One- and Two-Family Dwellings) of the St. Peters Municipal Code (Ord. No. 7912, 12-21-2023). The city's own current-edition "Residential Re-Roofing Requirements" guide (Building Department, "Revised 3/27/2024") independently states: "The City of St. Peters has adopted the International Residential Code (IRC) with amendments," citing the same section numbers (R905, R908, R301.2) used in the 2021-edition ordinance -- edition of the guide and the codified ordinance match.
Drip edge
Required — "For asphalt shingle roofs, drip edges are required per IRC Section R905.2.8.5." (City of St. Peters "Residential Re-Roofing Requirements," Building Department, "Revised 3/27/2024," citing the currently adopted 2021 IRC.) R905.2.8.5 is not listed among the city's Chapter 9 amendments (only R905.2.8.2 Valleys is amended, per both ecode360 Section 504.040 and the guide itself), so this reflects unamended 2021 IRC baseline text as confirmed by the city's own current guide -- exact baseline wording (extension distance, fastener spacing) was not separately quoted in this source and was not independently verified against the 2021 ICC text.
Ice & water shield
Not required — "For asphalt shingle roofs, the ice barrier mentioned in IRC Section R905.2.7 Ice Barrier, is not required by IRC Table R301.2 as amended and adopted by the City of St. Peters." (City of St. Peters "Residential Re-Roofing Requirements," Building Department, "Revised 3/27/2024.") Directly corroborated by the currently codified Section 504.040(A)(25), which amends Table R301.2 and lists: "Ice barrier underlayment on the roof = none."
Repair permit threshold
City of St. Peters "Residential Re-Roofing Requirements" guide (Building Department, "Revised 3/27/2024"): "A building permit for the reroofing is required whenever any of the following is applicable: - more than 25% of the sheathing needs to be replaced, or - the type of roof covering is being changed to a different material (e.g. wood shingles changed to asphalt shingles, etc.) regardless of the slope, or the gaps/space between the existing boards are 1/2" or more -- panel sheathing needs to be installed[,] or - panel sheathing needs to be installed because the existing spaced boards have too large of gaps/spaces between the boards." By negative implication, ordinary like-for-like asphalt-shingle reroofing with =25% sheathing replacement does not require a permit; the document separately confirms: "Even though a building permit is not required to re-roof structures, the code includes a provision that the work must still be done in a manner that is not in violation of the provisions of the code."
Wind design criteria
Section 504.040(A)(25) (amending Table R301.2 Climatic and Geographic Design Criteria, Ord. No. 7912, 12-21-2023) states: "Wind speed = 115 M.P.H. Seismic design category for residential construction = 'C'." The amendment lists only these values plus ground snow load, weathering, frost depth, termite, winter design temp, flood hazards, air freezing index, and mean annual temp -- it does not separately restate topographic effects, special wind region, or windborne debris zone entries, so those three sub-fields are not independently confirmed for St. Peters and are omitted here rather than assumed to match the "No" values seen in neighboring St. Charles County jurisdictions.
Roof layer limit / recover
"In accordance with IRC Section R908.3, all existing layers of roof coverings must be removed down to the sheathing before reroofing. The only exception is when there is only a single layer of existing roof covering and the roof covering and sheathing below is an adequate base that is neither deteriorated and not water soaked." (City of St. Peters "Residential Re-Roofing Requirements," Building Department, "Revised 3/27/2024," citing the currently adopted 2021 IRC.)
Deck & sheathing requirements
"For asphalt shingle roofs, asphalt shingles are required to be fastened to solidly sheathed decks per IRC Section R905.2.1. Wood structural panel sheathing of the thicknesses and spans allowed under the building code in effect when the sheathing was installed is considered a proper base for reroofing installations provided the sheathing is not deteriorated, warped, cracked, or delaminated between supports. Similarly, existing wood sheathing boards having 1/2" spacing or less between boards, or sheathing boards having greater spacing or gaps overlaid with a minimum 3/8" thick panel sheathing product, will generally be considered a suitable alternative base for asphalt shingle reroofing." (City of St. Peters "Residential Re-Roofing Requirements," Building Department, "Revised 3/27/2024," citing the currently adopted 2021 IRC; R905.2.1 is not listed among the city's Chapter 9 amendments on ecode360, so this reflects unamended 2021 IRC baseline text as published by the city itself.)
Sales & use tax
Base combined sales tax rate for St. Peters, Missouri (St. Charles County) is 7.9500% (Missouri DOR jurisdiction code 65126-183-000), 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 higher on specific parcels: e.g. Suemandy Drive Two CID (65126-183-002), Suemandy Mid Rivers CID (65126-183-003), St. Peters Hotel CID (65126-183-007), and Shoppes of Mid Rivers CID (65126-183-008) each raise it to 8.9500%; Mid Rivers North TDD (65126-183-005) raises it to 8.4500%. 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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The permitting authority for the City of St. Peters, Missouri (St. Charles County). The Building Department publishes a Residential Re-Roofing Requirements guide and administers the city's adopted 2021 International Residential Code (Chapter 504 of the Municipal Code).

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Roofing questions — St. Peters, MO

Do you need a permit to replace a roof in St. Peters, MO?

Not required. City of St. Peters "Residential Re-Roofing Requirements" guide (Building Department, "Revised 3/27/2024"): "A building permit for the reroofing is required whenever any of the following is applicable: - more than 25% of the sheathing needs to be replaced, or - the type of roof covering is being changed to a different material (e.g. wood shingles changed to asphalt shingles, etc.) regardless of the slope, or the gaps/space between the existing boards are 1/2" or more -- panel sheathing needs to be installed[,] or - panel sheathing needs to be installed because the existing spaced boards have too large of gaps/spaces between the boards." By negative implication, ordinary like-for-like asphalt-shingle reroofing with =25% sheathing replacement does not require a permit; the document separately confirms: "Even though a building permit is not required to re-roof structures, the code includes a provision that the work must still be done in a manner that is not in violation of the provisions of the code."

Is ice & water shield required in St. Peters, MO?

Not required — "For asphalt shingle roofs, the ice barrier mentioned in IRC Section R905.2.7 Ice Barrier, is not required by IRC Table R301.2 as amended and adopted by the City of St. Peters." (City of St. Peters "Residential Re-Roofing Requirements," Building Department, "Revised 3/27/2024.") Directly corroborated by the currently codified Section 504.040(A)(25), which amends Table R301.2 and lists: "Ice barrier underlayment on the roof = none.".

Is drip edge required?

Required — "For asphalt shingle roofs, drip edges are required per IRC Section R905.2.8.5." (City of St. Peters "Residential Re-Roofing Requirements," Building Department, "Revised 3/27/2024," citing the currently adopted 2021 IRC.) R905.2.8.5 is not listed among the city's Chapter 9 amendments (only R905.2.8.2 Valleys is amended, per both ecode360 Section 504.040 and the guide itself), so this reflects unamended 2021 IRC baseline text as confirmed by the city's own current guide -- exact baseline wording (extension distance, fastener spacing) was not separately quoted in this source and was not independently verified against the 2021 ICC text..

Do roofing contractors need a license or registration in St. Peters, MO?

Required. City of St. Peters Code Section 605.005 (License Required): "No person shall be engaged in, prosecute or carry on any business, trade, profession, vocation or occupation, either in whole or in part, in the City by maintaining an office in the City or by soliciting orders through such office, or by any other manner whatsoever, without having first paid a license fee where applicable ... and having been issued a license/certificate when applicable ..., under the power of Section 94.270, RSMo." Exemptions are limited to: professions listed in Sections 71.620 and 71.630, RSMo. (state-law-exempt professions such as certain licensed professionals); businesses/occupations exempt by state law from license taxes; not-for-profit organizations; home-based businesses operating 7 days or less per calendar year; budget-funded agencies; and political/government agencies. Roofing/ general contractors are not among these exemptions, so a roofing contractor doing business in St. Peters is subject to the general business license requirement. This is a general business license, NOT a roofing- or construction-trade-specific license. Section 605.007(B) additionally requires "proof of a certificate of insurance for workers' compensation coverage if said applicant for license is required to cover his or her liability under Chapter 287.061, RSMo." as a condition of issuance. Fee schedule (Section 605.013): "General business (605.030) $50" per year. NOTE: separate county/state trade-license requirements apply specifically to mechanical, electrical, plumbing, and drainlaying contractors (via St. Charles County or State of Missouri, per city-code cross-references found in web search of the Mechanical/Electrical/Plumbing code chapters) -- roofing/general contractors are not named among those specifically trade-licensed categories; only the general business license was confirmed to apply..

What building code does St. Peters, MO use?

International Residential Code (IRC), 2021 Edition, as amended, including Appendices AE, AK, AM, and AP, codified as Chapter 504 (Residential Code for One- and Two-Family Dwellings) of the St. Peters Municipal Code (Ord. No. 7912, 12-21-2023). The city's own current-edition "Residential Re-Roofing Requirements" guide (Building Department, "Revised 3/27/2024") independently states: "The City of St. Peters has adopted the International Residential Code (IRC) with amendments," citing the same section numbers (R905, R908, R301.2) used in the 2021-edition ordinance -- edition of the guide and the codified ordinance match.