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, Nottingham Township administers the code itself: Section 155-1 of its Code (Ord. No. 77, adopted June 7, 2004) says the Township "hereby elects to administer and enforce the provisions of the Pennsylvania Construction Code Act," Section 155-2 adopts the Uniform Construction Code "as the municipal building code of the municipality," and Section 155-3 lets the Board of Supervisors choose by resolution among an employee, "one or more construction code officials or third-party agencies" and other arrangements. The Township's Staff page lists, under "BUILDING INSPECTOR & ELECTRICAL INSPECTOR," Municipal Consulting Services at 724-263-0377, its UCC Board of Appeals page says the Township "has elected to admininster and enforce the provisions of the Pennsylvania Construction Code Act," and the Township office is at 909 Sugar Run Road, Eighty Four (724-348-5622, "Office Hours: M-F 8AM - 4PM"). The Township's pages name no residential code edition; the building permit application it posts says the applicant agrees "all applicable provisions of the Township Codes, the Energy Conservation Act 222 of 1990 and the 2004 Uniform Construction Code shall be complied with," and Section 155-2 adopts the code "as amended from time to time." This record has not read any 2004 edition's text and does not decide which edition the Township applies.
Permit process
Nottingham Township's own pages name no residential reroof as permit work or as exempt. Its Forms and Fees page posts a one-page list headed "PERMIT ARE REQUIRED FOR" (read October 10, 2026) whose "Residential construction" list begins "Building permit approval is required prior to the construction of the following:" and runs from new homes through "Deck roof, Porch roof" and "Remodeling or alteration of the structure, which involves changing structural or supporting members"; it names no house roof covering. Its "Commercial construction" list includes "Roof – any work to an existing roof other than ordinary repairs," and its list of work that does not need a permit includes "Residential window replacement without structural change" and names no roofing. Section 425-129(A) of the Township's zoning chapter (Article XVII, Certificates and Permits) requires "A building permit ... prior to the razing, erection, enlargement and structural alteration of any building, structure or portion thereof" and adds "A building permit is not necessary for exterior painting or the removal and replacement of lights or roofing shingles, siding, windows, doors, chimneys or entrances." That sentence sits in the zoning chapter and speaks to the zoning chapter's building permit, and this record does not decide whether it answers for the Uniform Construction Code permit the Township's building inspector issues. The Township's fee resolution (Exhibit A, building permits, as posted) lists a residential "Repairs & Alterations" line by cost of construction and names no roof work, and its posted building permit application lists "ALTERATION" and "RENOVATION" among its types of construction and has no roofing line. 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." Ask the Township office (724-348-5622) or the building inspector (724-263-0377) before starting. Read for this answer: Chapter 155, Construction, Article I, Uniform Construction Code (Sections 155-1 to 155-7), in full; Chapter 425, Zoning, Article XVII (Sections 425-129 to 425-133) and the zoning officer's duties in Section 425-136; every page of a search of the whole Township Code for "roof" (28 results, none other than Section 425-129 naming a permit) and for "reroofing" (none); the Township's Staff, UCC Board of Appeals, Ordinance Information and Forms and Fees pages; the permit list, permit checklist and building permit application the Township posts; the zoning certificate packet; and the Township's fee resolution.