The Roofing Book

Permitting Authorities / Tredyffrin Township - Permits & Inspections Department

Do you need a permit to replace a roof in Township of Tredyffrin, PA?

Adopted code

Tredyffrin Township - Permits & Inspections Department

Yes, a permit is required to replace a roof in Township of Tredyffrin, PA, issued by Tredyffrin Township - Permits & Inspections Department. Tredyffrin Township's Permits & Inspections Department treats roof replacement beyond a small repair as permit work. The Permits & Inspections Department's Building & Construction Permits page (read October 6, 2026) says "Ordinary repairs to structures do not require a building permit" and lists among them "Replacement of existing roof material that does not exceed 25% of the total roof area performed within any 12-month period," so a full reroof is outside that list. The Township's 2026 Fee Schedule (approved by the Board of Supervisors January 5, 2026; read October 6, 2026) lists under BUILDING PERMITS a "Roofing/Stucco Siding" fee of "$54.50, plus $2.50/$85 of cost" for residential work. The department's page also says "Building permits are required to construct, enlarge, alter, repair, move, demolish, or otherwise change the occupancy of a building." Chapter 80 of the Township Code names no roof work either way. 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 of a municipal ordinance that adds to the code, section 503(c) says "An ordinance under this subsection shall not be effective nor enforceable unless subsections (d), (e), (f), (g), (h) and (i) have been satisfied." This record does not decide whether the municipality's requirement is one adopted under section 503 or kept in effect by section 303(b)(1). The Department of Labor and Industry's register of municipal code change ordinances lists a Tredyffrin Township ordinance that "Requires a building permit for all residential utility and miscellaneous use structures that have a building area of 120 sq. ft or more," with an approval letter mailed August 10, 2005, "Enacted 9 / 26 / 05," and later challenged and settled after the ordinance was amended; it does not name roof work. In practice, expect the Township to require a permit for a reroof of more than 25% of the roof area in 12 months; its fee schedule says of "Starting construction without proper permits" that the "Permit fee is doubled," and Section 80-7 sets a fine of "not more than $1,000" for building in violation of the code. All applications go through the Clariti portal ("Mailed and e-mailed applications/materials are no longer accepted"); fees are invoiced after plan review, permits "must be posted & visible from the street," and inspections are scheduled at 610-644-1400, option 4. Section 96-6 of the Township Code says "It shall be unlawful for any contractor, as defined herein, to do work for which a construction permit is required within Tredyffrin Township without first registering with the Township," and its definition of contractor names roofing; the 2026 registration fee is $75, and a homeowner working on his or her own primary residence is exempt (Section 96-8). Read for this answer: Chapter 80 of the Township Code, Building Construction (Sections 80-1 to 80-8), in full; Chapter 96, Contractors, Registration of, in full; a search of the whole Township Code for "roof," which found no other permit provision naming roof work; the department's Permits & Inspections and Building & Construction Permits pages; and the 2026 Fee Schedule.

Roof code checklist: Township of Tredyffrin, PA

ItemAnswerCode citeSourceVerified
Permit to replace a roofYestredyffrin.org2026-10-06
Repair permit thresholdPublishedpacodeandbulletin.gov2026-10-06
Layer limit / roof-overPublishedR908.3.1.1pacodeandbulletin.gov2026-10-06
Deck & sheathingPublishedR905.2.1pacodeandbulletin.gov2026-10-06
Drip edgeNot published
Ice & water shieldNot published
Mid-roof inspectionNot published
Impact-resistant (Class 4) roofingNot published
Wind design criteriaNot published
Adopted codePublishedSec. 80-1pacodeandbulletin.gov2026-10-06
Contractor license / registrationYespalegis.us2026-10-06
Sales & use taxPublishedpa.gov2026-10-06

Each row comes from the sourced record on this page; full wording is in the table below. "Not published" means no official source for that item was found when the record was last verified.

Jurisdiction
Township of Tredyffrin, Pennsylvania
Jurisdiction type
city
Address
1100 DuPortail Road, Berwyn, PA 19312
Contact
  • url: https://www.tredyffrin.org/Departments/Permits-Inspections
  • phone: 610-644-1400
Roofing permit required
Required
Contractor registration required
Required
Permit process note
Tredyffrin Township's Permits & Inspections Department treats roof replacement beyond a small repair as permit work. The Permits & Inspections Department's Building & Construction Permits page (read October 6, 2026) says "Ordinary repairs to structures do not require a building permit" and lists among them "Replacement of existing roof material that does not exceed 25% of the total roof area performed within any 12-month period," so a full reroof is outside that list. The Township's 2026 Fee Schedule (approved by the Board of Supervisors January 5, 2026; read October 6, 2026) lists under BUILDING PERMITS a "Roofing/Stucco Siding" fee of "$54.50, plus $2.50/$85 of cost" for residential work. The department's page also says "Building permits are required to construct, enlarge, alter, repair, move, demolish, or otherwise change the occupancy of a building." Chapter 80 of the Township Code names no roof work either way. 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 of a municipal ordinance that adds to the code, section 503(c) says "An ordinance under this subsection shall not be effective nor enforceable unless subsections (d), (e), (f), (g), (h) and (i) have been satisfied." This record does not decide whether the municipality's requirement is one adopted under section 503 or kept in effect by section 303(b)(1). The Department of Labor and Industry's register of municipal code change ordinances lists a Tredyffrin Township ordinance that "Requires a building permit for all residential utility and miscellaneous use structures that have a building area of 120 sq. ft or more," with an approval letter mailed August 10, 2005, "Enacted 9 / 26 / 05," and later challenged and settled after the ordinance was amended; it does not name roof work. In practice, expect the Township to require a permit for a reroof of more than 25% of the roof area in 12 months; its fee schedule says of "Starting construction without proper permits" that the "Permit fee is doubled," and Section 80-7 sets a fine of "not more than $1,000" for building in violation of the code. All applications go through the Clariti portal ("Mailed and e-mailed applications/materials are no longer accepted"); fees are invoiced after plan review, permits "must be posted & visible from the street," and inspections are scheduled at 610-644-1400, option 4. Section 96-6 of the Township Code says "It shall be unlawful for any contractor, as defined herein, to do work for which a construction permit is required within Tredyffrin Township without first registering with the Township," and its definition of contractor names roofing; the 2026 registration fee is $75, and a homeowner working on his or her own primary residence is exempt (Section 96-8). Read for this answer: Chapter 80 of the Township Code, Building Construction (Sections 80-1 to 80-8), in full; Chapter 96, Contractors, Registration of, in full; a search of the whole Township Code for "roof," which found no other permit provision naming roof work; the department's Permits & Inspections and Building & Construction Permits pages; and the 2026 Fee Schedule.
Adopted 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, Tredyffrin Township administers the code itself: Section 80-1 of the Township Code says "The Township's Inspections Department shall administer and enforce the Uniform Construction Code in Tredyffrin" and "As necessary, third-party agencies also may be retained for plan examination or inspections on behalf of the Township of Tredyffrin," and the Permits & Inspections Department at the Township Building takes permit applications through the Township's online portal, Clariti, and lists Barry Isett & Associates as its third-party inspectors. Section 80-1 adopts the Uniform Construction Code, "as amended," as the Township's construction code. The department's Building & Construction Permits page refers to systems "regulated under the 2021 International Building Code" and, for residential Use and Occupancy permits, to "the 2006 ICC Codes"; it names no edition of the International Residential Code, and Section 80-2 of the Township Code makes its local changes to the 2018 International Building Code and International Plumbing Code; this record has not read the earlier editions' roofing text. Chapter 80 changes nothing in the code's roofing provisions.
Repair permit threshold
Tredyffrin Township exempts only small roof repairs from its permit and charges a residential roofing permit fee. The Permits & Inspections Department's Building & Construction Permits page (read October 6, 2026) says "Ordinary repairs to structures do not require a building permit" and lists among them "Replacement of existing roof material that does not exceed 25% of the total roof area performed within any 12-month period," so a full reroof is outside that list. The Township's 2026 Fee Schedule (approved by the Board of Supervisors January 5, 2026; read October 6, 2026) lists under BUILDING PERMITS a "Roofing/Stucco Siding" fee of "$54.50, plus $2.50/$85 of cost" for residential work. 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 of a municipal ordinance that adds to the code, section 503(c) says "An ordinance under this subsection shall not be effective nor enforceable unless subsections (d), (e), (f), (g), (h) and (i) have been satisfied." This record does not decide whether the municipality's requirement is one adopted under section 503 or kept in effect by section 303(b)(1). The Department of Labor and Industry's register of municipal code change ordinances lists a Tredyffrin Township ordinance that "Requires a building permit for all residential utility and miscellaneous use structures that have a building area of 120 sq. ft or more," with an approval letter mailed August 10, 2005, "Enacted 9 / 26 / 05," and later challenged and settled after the ordinance was amended; it does not name roof work. State law sets no square-footage or percentage threshold for roof work; any threshold is set locally. The Uniform Construction Code "does not apply to" "Alterations to residential buildings which do not make structural changes or changes to means of egress, except as required by ordinances in effect under sections 303(b)(1) or 503 of the act" or to "Repairs to residential buildings, except as required by ordinances in effect under sections 303(b)(1) and 503 of the act" (34 Pa. Code 403.1(b)(8) and (9)), and "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" (34 Pa. Code 403.62(c)). For houses the regulation adds: "An ordinary repair does not require a permit." Its list of work that is not an ordinary repair names cutting away a load-bearing wall, "The removal or cutting of any structural beam or load-bearing support," changes to a required means of egress, and new or relocated piping, wiring or mechanical work (34 Pa. Code 403.62(d)); roofing is not named. A municipality may require more: under Act 45 section 503(c) it "may enact ordinances pursuant to this section which adopt additional code requirements for alterations or repairs to residential buildings," after a public hearing and after filing the proposed ordinance with the Department of Labor and Industry. These rules concern a "Residential building," which the regulation defines as "Detached one-family and two-family dwellings and townhouses which are not more than three stories above grade plane in height with a separate means of egress and their accessory structures" (34 Pa. Code 401.1). Everything above is Pennsylvania state law, the same in every municipality. Locally, Tredyffrin Township administers the code itself: Section 80-1 of the Township Code says "The Township's Inspections Department shall administer and enforce the Uniform Construction Code in Tredyffrin" and "As necessary, third-party agencies also may be retained for plan examination or inspections on behalf of the Township of Tredyffrin," and the Permits & Inspections Department at the Township Building takes permit applications through the Township's online portal, Clariti, and lists Barry Isett & Associates as its third-party inspectors. The department's threshold is the 25% line quoted at the start; Chapter 80 of the Township Code sets none of its own.
Roof layer limit / recover
Two layers at most where the state code reaches the job. Pennsylvania adopts the 2021 International Residential Code without changing its reroofing section, R908 (34 Pa. Code 403.21(a)(7); the State's list of changes names no Chapter 9 section). Section R908.3.1.1 says "A roof recover shall not be permitted where any of the following conditions occur," and the third condition is "Where the existing roof has two or more applications of any type of roof covering." So one existing layer may be covered once, and a roof that already has two layers is torn off to the deck. The same section also bars a recover "Where the existing roof or roof covering is water soaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing" and "Where the existing roof covering is slate, clay, cement or asbestos-cement tile." The existing-building code the State also adopts, the 2021 International Existing Building Code (34 Pa. Code 403.21(f)), carries the same three conditions in Section 705.2.1.1. These rules bind work the Uniform Construction Code reaches. The Act does not apply to "Repairs to residential buildings" or to alterations that make no structural change, "except as might be required by ordinances" (Act 45 section 104(b)(5) and (6)), so whether R908 binds a particular house reroof turns on that exclusion and on the municipality's own ordinances. Everything above is Pennsylvania state law, the same in every municipality. Locally, Tredyffrin Township administers the code itself: Section 80-1 of the Township Code says "The Township's Inspections Department shall administer and enforce the Uniform Construction Code in Tredyffrin" and "As necessary, third-party agencies also may be retained for plan examination or inspections on behalf of the Township of Tredyffrin," and the Permits & Inspections Department at the Township Building takes permit applications through the Township's online portal, Clariti, and lists Barry Isett & Associates as its third-party inspectors. Chapter 80 of the Township Code changes nothing in the code's roofing provisions, and the department's pages say nothing on roof layers. The department's Building & Construction Permits page refers to systems "regulated under the 2021 International Building Code" and, for residential Use and Occupancy permits, to "the 2006 ICC Codes"; it names no edition of the International Residential Code, and Section 80-2 of the Township Code makes its local changes to the 2018 International Building Code and International Plumbing Code; the text above is the 2021 edition's, and the earlier editions' reroofing text was not read for this record.
Deck & sheathing requirements
State rules from the base code, where the state code reaches the job. Pennsylvania adopts the 2021 International Residential Code without changing Section R803, Roof Sheathing (34 Pa. Code 403.21(a)(7); the State's changes to Chapter 8 are to ridge framing and attic ventilation). Lumber roof sheathing follows Table R803.1: over rafters or beams 24 inches apart it must be at least 5/8 inch net thick. Wood structural panels "shall be identified for grade, bond classification and performance category by a grade mark or certificate of inspection issued by an approved agency," and their spans "shall not exceed the values set forth in Table R503.2.1.1(1) or APA E30." For shingles, "Asphalt shingles shall be fastened to solidly sheathed decks" (R905.2.1), and on any reroof "The structural roof components shall be capable of supporting the roof covering system and the material and equipment loads that will be encountered during installation of the roof covering system" (R908.2). These rules bind work the Uniform Construction Code reaches; the Act does not apply to "Repairs to residential buildings" or to alterations that make no structural change, "except as might be required by ordinances" (Act 45 section 104(b)(5) and (6)). Act 45 section 104(b)(5) excludes alterations "which do not make structural changes or changes to means of egress" and says only that "a structural change does not include a minor framing change needed to replace existing windows or doors"; 34 Pa. Code 403.62(d)(2) lists "The removal or cutting of any structural beam or load-bearing support" as not an ordinary repair. Neither names roof sheathing; this record does not decide whether replacing it is either. Everything above is Pennsylvania state law, the same in every municipality. Locally, Tredyffrin Township administers the code itself: Section 80-1 of the Township Code says "The Township's Inspections Department shall administer and enforce the Uniform Construction Code in Tredyffrin" and "As necessary, third-party agencies also may be retained for plan examination or inspections on behalf of the Township of Tredyffrin," and the Permits & Inspections Department at the Township Building takes permit applications through the Township's online portal, Clariti, and lists Barry Isett & Associates as its third-party inspectors. Chapter 80 of the Township Code changes nothing in the code's roof sheathing provisions. The department's list of ordinary repairs excludes "the removal or cutting of any structural beam or load bearing support" and draws no line for roof sheathing. The department's Building & Construction Permits page refers to systems "regulated under the 2021 International Building Code" and, for residential Use and Occupancy permits, to "the 2006 ICC Codes"; it names no edition of the International Residential Code, and Section 80-2 of the Township Code makes its local changes to the 2018 International Building Code and International Plumbing Code; the text above is the 2021 edition's, and the earlier editions' sheathing text was not read for this record.
Sales & use tax
6% Pennsylvania sales and use tax, with a local tax added on purchases made in Allegheny County (1%) and Philadelphia (2%). On a reroof the roofer pays the tax on the materials and does not add it to the homeowner's bill. The Department of Revenue says: "The Pennsylvania sales tax rate is 6 percent. By law, a 1 percent local tax is added to purchases made in Allegheny County, and 2 percent local tax is added to purchases made in Philadelphia." Roof work is a construction activity: the rule's list of items "presumed to become a permanent part of real estate" includes "Roofing (repairs)" (61 Pa. Code 31.11). For construction activities, "A contractor shall pay tax upon the purchase price ... of all property, including materials, equipment, components and supplies, which he furnishes and installs" (61 Pa. Code 31.12(a)(1)), and the rule's example says the contractor "does not charge sales tax on this transaction to his customer. The contractor may include the tax he must pay in his bid proposal but not as a separately stated item." Apart from limited exceptions set out in the rule, the same holds on jobs for tax-exempt owners: "a contractor erecting a building, repairing a roof, replacing a door for a governmental agency, ... school district, charitable or religious organization, and the like, shall pay tax upon the property which he consumes" (61 Pa. Code 31.13(a)). Everything above is Pennsylvania state law, the same in every municipality. Tredyffrin Township is in Chester County. The department's pages and the 2026 Fee Schedule say nothing on sales tax.

More roof permit pages in Pennsylvania

Township of Unity, PARoof permit Township of Upper Allen, PARoof permit Township of Upper Darby, PARoof permit Township of Upper Dublin, PARoof permit Township of Upper Macungie, PARoof permit

Related guides

Denver-Metro Roofing Permits Filing a Hail Insurance Claim Colorado Hail Season Prep Hiring a Contractor

Tredyffrin Township's Permits & Inspections Department, at the Township Building, 1100 DuPortail Road, Berwyn, issues building permits for work in the Township through its online portal, and its fee schedule carries a residential roofing permit fee. The Pennsylvania Uniform Construction Code applies statewide, but Act 45 section 104(b) lists "Repairs to residential buildings" and alterations that make no structural or egress change among work it 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."

Working an insurance claim in Township of Tredyffrin, PA? Everything on this page (drip edge, ice & water shield, inspections, Class 4 rules) formatted as a claim-ready evidence pack: verbatim ordinance quotes, code section cites, verification dates, and official source links, ready to attach to a supplement. See a real sample pack (PDF, 4 pages, free).

Buy this jurisdiction's pack: $12 Delivered by email within minutes.

Questions about the Township of Tredyffrin, PA pack?

Not ready to buy, or need a different jurisdiction? Tell us and we’ll reply directly.

By submitting, you agree to our Terms of Use and Privacy Policy.

Sources

Roofing questions: Township of Tredyffrin, PA

Do you need a permit to replace a roof in Township of Tredyffrin, PA?

Yes, a permit is required to replace a roof in Township of Tredyffrin, PA. Tredyffrin Township exempts only small roof repairs from its permit and charges a residential roofing permit fee. The Permits & Inspections Department's Building & Construction Permits page (read October 6, 2026) says "Ordinary repairs to structures do not require a building permit" and lists among them "Replacement of existing roof material that does not exceed 25% of the total roof area performed within any 12-month period," so a full reroof is outside that list. The Township's 2026 Fee Schedule (approved by the Board of Supervisors January 5, 2026; read October 6, 2026) lists under BUILDING PERMITS a "Roofing/Stucco Siding" fee of "$54.50, plus $2.50/$85 of cost" for residential work. 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 of a municipal ordinance that adds to the code, section 503(c) says "An ordinance under this subsection shall not be effective nor enforceable unless subsections (d), (e), (f), (g), (h) and (i) have been satisfied." This record does not decide whether the municipality's requirement is one adopted under section 503 or kept in effect by section 303(b)(1). The Department of Labor and Industry's register of municipal code change ordinances lists a Tredyffrin Township ordinance that "Requires a building permit for all residential utility and miscellaneous use structures that have a building area of 120 sq. ft or more," with an approval letter mailed August 10, 2005, "Enacted 9 / 26 / 05," and later challenged and settled after the ordinance was amended; it does not name roof work. State law sets no square-footage or percentage threshold for roof work; any threshold is set locally. The Uniform Construction Code "does not apply to" "Alterations to residential buildings which do not make structural changes or changes to means of egress, except as required by ordinances in effect under sections 303(b)(1) or 503 of the act" or to "Repairs to residential buildings, except as required by ordinances in effect under sections 303(b)(1) and 503 of the act" (34 Pa. Code 403.1(b)(8) and (9)), and "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" (34 Pa. Code 403.62(c)). For houses the regulation adds: "An ordinary repair does not require a permit." Its list of work that is not an ordinary repair names cutting away a load-bearing wall, "The removal or cutting of any structural beam or load-bearing support," changes to a required means of egress, and new or relocated piping, wiring or mechanical work (34 Pa. Code 403.62(d)); roofing is not named. A municipality may require more: under Act 45 section 503(c) it "may enact ordinances pursuant to this section which adopt additional code requirements for alterations or repairs to residential buildings," after a public hearing and after filing the proposed ordinance with the Department of Labor and Industry. These rules concern a "Residential building," which the regulation defines as "Detached one-family and two-family dwellings and townhouses which are not more than three stories above grade plane in height with a separate means of egress and their accessory structures" (34 Pa. Code 401.1). Everything above is Pennsylvania state law, the same in every municipality. Locally, Tredyffrin Township administers the code itself: Section 80-1 of the Township Code says "The Township's Inspections Department shall administer and enforce the Uniform Construction Code in Tredyffrin" and "As necessary, third-party agencies also may be retained for plan examination or inspections on behalf of the Township of Tredyffrin," and the Permits & Inspections Department at the Township Building takes permit applications through the Township's online portal, Clariti, and lists Barry Isett & Associates as its third-party inspectors. The department's threshold is the 25% line quoted at the start; Chapter 80 of the Township Code sets none of its own.

Can you roof over an existing roof in Township of Tredyffrin, PA?

Two layers at most where the state code reaches the job. Pennsylvania adopts the 2021 International Residential Code without changing its reroofing section, R908 (34 Pa. Code 403.21(a)(7); the State's list of changes names no Chapter 9 section). Section R908.3.1.1 says "A roof recover shall not be permitted where any of the following conditions occur," and the third condition is "Where the existing roof has two or more applications of any type of roof covering." So one existing layer may be covered once, and a roof that already has two layers is torn off to the deck. The same section also bars a recover "Where the existing roof or roof covering is water soaked or has deteriorated to the point that the existing roof or roof covering is not adequate as a base for additional roofing" and "Where the existing roof covering is slate, clay, cement or asbestos-cement tile." The existing-building code the State also adopts, the 2021 International Existing Building Code (34 Pa. Code 403.21(f)), carries the same three conditions in Section 705.2.1.1. These rules bind work the Uniform Construction Code reaches. The Act does not apply to "Repairs to residential buildings" or to alterations that make no structural change, "except as might be required by ordinances" (Act 45 section 104(b)(5) and (6)), so whether R908 binds a particular house reroof turns on that exclusion and on the municipality's own ordinances. Everything above is Pennsylvania state law, the same in every municipality. Locally, Tredyffrin Township administers the code itself: Section 80-1 of the Township Code says "The Township's Inspections Department shall administer and enforce the Uniform Construction Code in Tredyffrin" and "As necessary, third-party agencies also may be retained for plan examination or inspections on behalf of the Township of Tredyffrin," and the Permits & Inspections Department at the Township Building takes permit applications through the Township's online portal, Clariti, and lists Barry Isett & Associates as its third-party inspectors. Chapter 80 of the Township Code changes nothing in the code's roofing provisions, and the department's pages say nothing on roof layers. The department's Building & Construction Permits page refers to systems "regulated under the 2021 International Building Code" and, for residential Use and Occupancy permits, to "the 2006 ICC Codes"; it names no edition of the International Residential Code, and Section 80-2 of the Township Code makes its local changes to the 2018 International Building Code and International Plumbing Code; the text above is the 2021 edition's, and the earlier editions' reroofing text was not read for this record.

Do roofing contractors need a license or registration in Township of Tredyffrin, PA?

Yes.

What building code does Township of Tredyffrin, PA use?

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, Tredyffrin Township administers the code itself: Section 80-1 of the Township Code says "The Township's Inspections Department shall administer and enforce the Uniform Construction Code in Tredyffrin" and "As necessary, third-party agencies also may be retained for plan examination or inspections on behalf of the Township of Tredyffrin," and the Permits & Inspections Department at the Township Building takes permit applications through the Township's online portal, Clariti, and lists Barry Isett & Associates as its third-party inspectors. Section 80-1 adopts the Uniform Construction Code, "as amended," as the Township's construction code. The department's Building & Construction Permits page refers to systems "regulated under the 2021 International Building Code" and, for residential Use and Occupancy permits, to "the 2006 ICC Codes"; it names no edition of the International Residential Code, and Section 80-2 of the Township Code makes its local changes to the 2018 International Building Code and International Plumbing Code; this record has not read the earlier editions' roofing text. Chapter 80 changes nothing in the code's roofing provisions.