Adopted building code
The 2021 International Residential Code, as adopted by the State in the Pennsylvania Uniform Construction Code (UCC). 34 Pa. Code 403.21(a)(7) adopts "The 'International Residential Code of 2021,' except that:" followed by the State's list of exclusions and modifications, effective January 1, 2026 (55 Pa.B. 7701). None of the State's changes touches Chapter 9, Roof Assemblies, or Section R803, Roof Sheathing, so those apply as the International Code Council publishes them. Work on existing buildings is also pointed to the State's existing-building code: "The repair, alteration, change of occupancy, addition and relocation of existing buildings must comply with Chapter 34 of the 'International Building Code of 2021' or with the 'International Existing Building Code of 2021'" (34 Pa. Code 403.21(f)). The UCC is the minimum everywhere in the state: "no municipality may propose or enact any ordinance which is less than the minimum requirement of the Uniform Construction Code" (Pennsylvania Construction Code Act, Act 45 of 1999, section 503(b)). The Act also lists work it "shall not apply to", including "Alterations to residential buildings which do not make structural changes or changes to means of egress" or to "Repairs to residential buildings," in each case "except as might be required by ordinances" kept in force under section 303(b)(1) or adopted under section 503 (Act 45 section 104(b)(5) and (6); 34 Pa. Code 403.1(b)(8) and (9)). The Act defines a repair as "The reconstruction or renewal of any part of an existing building for the purpose of its maintenance." So whether the code's roofing rules reach a given house reroof depends on the municipality's own ordinances. Everything above is Pennsylvania state law, the same in every municipality. Locally, Carlisle Borough administers the code itself: Section 89-1 of the Borough Code says "The Borough hereby elects to administer and enforce the provisions of the code, as amended from time to time," Section 89-4 A provides for "the designation of an employee of the Borough to serve as the Building Code Official," and the Borough's Code Enforcement page says its Codes Office, part of the Sustainable Community and Economic Planning Department, "also handles construction inspection." Section 89-7 names Chapter 89 the "Carlisle Borough Building Code," and Section 89-9 amends Table R301.2(1) of the International Residential Code with the Borough's climatic and geographic design criteria, whose attached table marks ice shield underlayment required "Yes"; Chapter 89 changes nothing in the code's roofing provisions and names no code edition, and the Borough's pages name none.
Permit process
In the Historic Preservation District, Carlisle Borough issues no permit for exterior work, roofing included, until Borough Council grants a certificate of appropriateness; outside it, the Borough has published no statement on whether a house reroof needs a permit. Chapter 89 of the Borough Code, Building Construction (Sections 89-1 to 89-9), adopts the Pennsylvania Construction Code Act and its regulations and names no roof work as permit work or as exempt. The Borough's "When Do I Need a Permit?" guide (read October 7, 2026) lists work needing a building and zoning permit or a zoning permit only, does not name roofing, and says "This list is meant to provide you with a quick reference guide. To be absolutely certain if you need a permit of any kind, or if you have any questions, please contact the Borough's Codes Office at 717-240-6930." The Borough's permit fee schedule (Resolution No. 05-14-26-01) names "roof replacements" only in its COMMERCIAL "Miscellaneous Construction Project" category; its RESIDENTIAL categories are new dwellings and additions and solar systems. In the Historic Preservation District, Section 255-154 of the Zoning chapter says "A certificate of appropriateness is required for any erection, construction, reconstruction, exterior alteration, repair, restoration, sandblasting, demolition or razing of a building" where the work will affect the exterior seen from a public way, and "The Borough Zoning Officer shall not issue a permit or written authorization for any such work until the Borough Council has issued a certificate of appropriateness"; the Borough's HARB application lists "Roof" among types of work and places roofing replacement on its consent agenda where it "must be replaced with in-kind materials." The Borough has published no statement on whether a house reroof outside the historic district needs a permit, and this record does not state whether one is required. Under state law, Act 45 says the Act "shall not apply to" "Alterations to residential buildings which do not make structural changes or changes to means of egress, except as might be required by ordinances in effect pursuant to section 303(b)(1) or adopted pursuant to section 503" or to "Repairs to residential buildings, except as might be required by ordinances in effect pursuant to section 303(b)(1) or adopted pursuant to section 503" (section 104(b)(5) and (6)), and 34 Pa. Code 403.62(c) says "A permit is not required for the exceptions listed in § 403.1(b) (relating to scope) and the following, if the work does not violate a law or ordinance." Before starting a reroof, ask the Codes Office (717-240-6930) whether it requires a permit for the job. The Application for Work Permit asks "Is the property located in the Historic District?"; the HARB application fee is $50 and says "Any required building permit or sign permit application must be submitted at the time of HARB application." Read for this answer: Chapter 89 of the Borough Code, Building Construction, with its Table R301.2(1), in full; Chapter 120, Fees, Article II, in full; Article XXI of Chapter 255, Historic Preservation District (Overlay); Chapter 183, Property Maintenance; a search of the whole Borough Code for "roof" and for "reroofing," which found no permit provision naming roof work; the Code Enforcement, "When Do I Need a Permit?" and Forms and Applications pages; the Application for Work Permit; the HARB application packet; and the permit fee schedule. The Borough office, 53 West South Street, Carlisle, is open Monday to Friday, 7:30 AM to 4:30 PM.