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, The Borough of Hollidaysburg administers the code itself with retained inspection agencies: Section 101 of Chapter 5 of the Borough Code says the Borough "hereby elects to administer and enforce the provisions of the Pennsylvania Construction Code Act," the Borough's Community Development page says the Department "issues building, zoning, and other development permits and provides building inspections and plan reviews," and it lists building inspectors from Commonwealth Code Inspection Service and Middle Department Inspection Agency, the two choices of third-party inspector on the Borough's permit application. Section 102 adopts the Uniform Construction Code "as amended from time to time" and incorporates it by reference "as the Municipal Building Code of the Borough of Hollidaysburg," and Chapter 5 changes nothing in the code's roofing provisions. Neither Chapter 5 nor the Borough's pages name a code edition.
Permit process
No Borough of Hollidaysburg text read names reroofing as permit work or as exempt. The Community Development page (read October 9, 2026) says "Most projects require either a building permit or a zoning permit," lists new construction, additions, decks, swimming pools and accessory structures among work that requires permits, and under "Renovations (Commercial and Residential)" says "Only certain types of residential renovations require the issuance of a permit. Contact the Permitting Office for additional information." It does not name roof work either way. Part 1 of Chapter 5 of the Borough Code, Uniform Construction Code (Ord. 799, June 17, 2004), adopts the Uniform Construction Code "as amended from time to time" and adds no permit clause and no roof words of its own; Section 105 keeps in force building code ordinances adopted on or before July 1, 1999 "which equal or exceed the requirements of the Code," and no such building code appears in the Borough Code as published. The Borough's 2025 fee resolution (Resolution No. 2024-44) prices building code inspection services "As per the fee schedule attached hereto plus 20% administrative fee"; the published copy does not include that schedule and has no roofing line. Its zoning fees list "Permits for repairs and replacements (including sidewalks and driveways, excluding painting)" without naming roofs, and Section 702 of the Zoning Ordinance requires a zoning permit before any person may "Construct, reconstruct, move, alter, or enlarge any structure or building." Under state law, Act 45 section 104(b)(5) and (6) list "Alterations to residential buildings which do not make structural changes or changes to means of egress" and "Repairs to residential buildings" among work the Act does not apply to, "except as might be required by ordinances in effect pursuant to section 303(b)(1) or adopted pursuant to section 503," 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." Because the Borough's only general building permit clause is the state code's own, adopted by reference, the zoning permit clause names no roof work, and the Borough has published no statement on reroofs beyond its referral, this record does not decide whether the Borough requires a permit for an ordinary reroof. The page also says "All required permits must be applied for, reviewed, and approved prior to the commencement of any construction activity" and encourages residents and contractors "to contact this office before beginning any construction, renovation, or land development projects." Properties in the Historic Resources Overlay District have their own review under Part 3 of the Zoning Ordinance. The office is open Monday through Friday, 8:00 A.M. to 4:00 P.M., at (814) 695-7543. Read for this answer: Chapter 5 of the Borough Code, Code Enforcement, and Chapter 4, Buildings, in full; Chapter 27, Zoning, searched for every mention of roofs, whose roof references are design, height and historic-district standards and none of which names a permit for roof work; the Community Development and Code of Ordinances pages; the Building and Zoning Permit Application; and the 2025 fee resolution.