The Roofing Book

Permitting Authorities / Borough of Mountainside - Construction Department

Do you need a permit to replace a roof in Borough of Mountainside, NJ?

Adopted code

Borough of Mountainside - Construction Department

Yes, a permit is required to replace a roof in Borough of Mountainside, NJ, issued by Borough of Mountainside - Construction Department. Mountainside's Construction Department states a permit requirement for roofing that the state rule does not make for a detached one- or two-family house. Its FAQs say "A construction permit is also required to do the following" and list "Replace siding or roofing." The state rule, N.J.A.C. 5:23-2.7(c), lists "The repair or replacement of existing roof covering on detached one- and two-family dwellings" among items that "are ordinary maintenance and shall be treated as such by every enforcing agency," and says "No permit for, inspections of, or notice to the enforcing agency of ordinary maintenance shall be required." The State Uniform Construction Code Act, N.J.S.A. 52:27D-123.1, says "Any law or regulation to the contrary notwithstanding," the "alteration, renovation, rehabilitation, repair, maintenance, removal, or demolition of all buildings or structures already erected shall be regulated pursuant to the 'State Uniform Construction Code Act.'" This record does not decide whether the department's demand is lawful under those provisions. In practice, a roofer should expect Mountainside's Construction Department to ask for a permit for roofing, as its FAQs state; the FAQs also say "State law mandates that the Construction Official issue a fine of up to $2,000 to any person who performs work without a permit." Reroofing a townhouse or other attached dwelling, or any other building, needs a permit under the state rule in any case. The department works from Borough Hall, 1385 US Highway 22 East, phone 908-232-2919. Applications are filed with the Construction Department and need "proof of registration" from a contractor; the department page says "Requests for online payments must be made through the construction office by calling 908.232.2919." All inspection appointments are made through the SDL Portal, building inspections run "Tuesday, Wednesday and Thursday -- 7:00 to 10am," inspectors "must have 24 hours advance notice," and "For renovations and projects other than new construction, contact the Construction Department for inspection requirements." The department page and FAQs publish no fee schedule.

Roof code checklist: Borough of Mountainside, NJ

ItemAnswerCode citeSourceVerified
Permit to replace a roofYesnjac_5_23_2.pdf2026-10-02
Repair permit thresholdPublishednjac_5_23_2.pdf2026-10-02
Layer limit / roof-overPublishednjac_5_23_6.pdf2026-10-02
Deck & sheathingNot published
Drip edgeNot published
Ice & water shieldNot published
Mid-roof inspectionNonjac_5_23_2.pdf2026-10-02
Impact-resistant (Class 4) roofingNo52_27D_119.pdf2026-10-02
Wind design criteriaNot published
Adopted codePublishednjac_5_23_3.pdf2026-10-02
Contractor license / registrationYespub.njleg.gov2026-10-02
Sales & use taxPublishedsu3.pdf2026-10-02

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
Borough of Mountainside, New Jersey
Jurisdiction type
city
Address
1385 US Highway 22 East (Borough Hall), Mountainside, NJ 07092
Contact
  • url: https://www.mountainside-nj.com/department/buildingzoningengineering/
  • phone: 908-232-2919
Permit portal
Permit portal
Roofing permit required
Required
Contractor registration required
Required
Registration details
  • state_level: New Jersey requires home improvement contractors to register with the Division of Consumer Affairs. The Contractors' Registration Act as enacted in 2004 (P.L.2004, c.16), C.56:8-138(a), reads: "No person shall offer to perform, or engage, or attempt to engage in the business of making or selling home improvements unless registered with the Division of Consumer Affairs in accordance with the provisions of this act." The Uniform Construction Code's permit rule, N.J.A.C. 5:23-2.15(b)9, reads: "If work involves a home improvement performed by a contractor, such contractor shall be registered pursuant to N.J.S.A. 56:8-136 et seq. The registration number of the contractor shall appear on the permit application."
  • city_level: The Mountainside Construction Department FAQs say "All contractors are required to be licensed by the New Jersey Department of Consumer Affairs and must provide proof of registration to the Construction Department in order to file and receive a construction permit." The department page posts no contractor licence or registration of the Borough's own.
Permit process note
Mountainside's Construction Department states a permit requirement for roofing that the state rule does not make for a detached one- or two-family house. Its FAQs say "A construction permit is also required to do the following" and list "Replace siding or roofing." The state rule, N.J.A.C. 5:23-2.7(c), lists "The repair or replacement of existing roof covering on detached one- and two-family dwellings" among items that "are ordinary maintenance and shall be treated as such by every enforcing agency," and says "No permit for, inspections of, or notice to the enforcing agency of ordinary maintenance shall be required." The State Uniform Construction Code Act, N.J.S.A. 52:27D-123.1, says "Any law or regulation to the contrary notwithstanding," the "alteration, renovation, rehabilitation, repair, maintenance, removal, or demolition of all buildings or structures already erected shall be regulated pursuant to the 'State Uniform Construction Code Act.'" This record does not decide whether the department's demand is lawful under those provisions. In practice, a roofer should expect Mountainside's Construction Department to ask for a permit for roofing, as its FAQs state; the FAQs also say "State law mandates that the Construction Official issue a fine of up to $2,000 to any person who performs work without a permit." Reroofing a townhouse or other attached dwelling, or any other building, needs a permit under the state rule in any case. The department works from Borough Hall, 1385 US Highway 22 East, phone 908-232-2919. Applications are filed with the Construction Department and need "proof of registration" from a contractor; the department page says "Requests for online payments must be made through the construction office by calling 908.232.2919." All inspection appointments are made through the SDL Portal, building inspections run "Tuesday, Wednesday and Thursday -- 7:00 to 10am," inspectors "must have 24 hours advance notice," and "For renovations and projects other than new construction, contact the Construction Department for inspection requirements." The department page and FAQs publish no fee schedule.
Adopted code
The 2024 International Residential Code, New Jersey edition, adopted by the State, with the Rehabilitation Subcode for work on existing buildings. New Jersey has one construction code, the Uniform Construction Code (N.J.A.C. 5:23), which every municipality enforces; municipalities do not adopt building codes of their own (N.J.S.A. 52:27D-123.1 and 52:27D-139). N.J.A.C. 5:23-3.21(a)1 adopts the International Code Council's "2024 International Residential Code known as the IRC/2024 as the one- and two-family dwelling subcode in New Jersey subject to the modifications stated at (c) below," and 3.21(b) applies it to "detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height." The section was rewritten by R.2026 d.086, "effective August 17, 2026," in the Department of Community Affairs' print of the rules "adopted and published through the New Jersey Register, Vol. 58 No. 16," and the Department's Current Construction Codes page lists the "International Residential Code/2024, NJ ed" with an adoption date of Aug 17, 2026. Other buildings fall under the building subcode, the International Building Code/2024, NJ edition (N.J.A.C. 5:23-3.14). Roof work on an existing building is held to the Rehabilitation Subcode: "Existing structures, when repaired, renovated, altered or reconstructed, shall conform to the requirements of N.J.A.C. 5:23-6, Rehabilitation Subcode" (N.J.A.C. 5:23-2.4(a)). A six-month grace period follows the adoption. N.J.A.C. 5:23-1.6(a): "For a period of six months following the operative date of a subcode revision, applicants may submit a complete permit application, including all prior approvals, to be reviewed under the code in force immediately preceding the subcode revision." The rule history gives R.2026 d.086 no date other than its effective date, so on that reading the window runs from August 17, 2026 until about February 17, 2027: a complete application filed inside it may be reviewed under either the prior edition or the 2024 edition, at the applicant's choice, and one filed after it closes is reviewed under the 2024 edition. Everything above is New Jersey state law, the same in every municipality. Locally, the Mountainside Construction Department FAQs say inspections are made to ensure "that all construction is in accordance with the Uniform Construction Code of New Jersey and its adopted codes" and name no edition.
Mid-roof inspection
Not required — No mid-roof inspection under state law. Reroofing a detached one- or two-family house is ordinary maintenance, and N.J.A.C. 5:23-2.7(c) says "No permit for, inspections of, or notice to the enforcing agency of ordinary maintenance shall be required." Where a reroof does need a permit, N.J.A.C. 5:23-2.18(b)1 says "Inspections of one- and two-family dwellings for which construction must cease until the inspection is made shall be limited to the following": footing trenches, foundations, utility services and a mid-point inspection, whose building item is "All structural framing, connections, wall and roof sheathing, and insulation." The list names no roof-covering or underlayment stage, and the rule does not say whether its sheathing item reaches a permitted reroof that replaces sheathing. Any further inspection a municipality requires "shall be of the type and nature that construction may continue without interruption" (5:23-2.18(b)3). Everything above is New Jersey state law, the same in every municipality. Locally, the Mountainside Construction Department FAQs list building inspections for new work, including a "Rough inspection which includes all structural walls, floors and roofs prior to covering with finish or infill materials," and say "For renovations and projects other than new construction, contact the Construction Department for inspection requirements"; they name no roof-covering or mid-roof inspection for a reroof.
Impact-resistant roofing
Not required — No impact-resistant roofing requirement under state law. The New Jersey Uniform Construction Code rules that reach a house reroof (the administrative rules in N.J.A.C. 5:23-1 and 5:23-2, the State's amendments to the 2024 International Residential Code at 5:23-3.21, and the Rehabilitation Subcode at 5:23-6) contain no UL 2218, Class 4 or hail-impact requirement for roof coverings. A municipality cannot add one: N.J.S.A. 52:27D-123.1 says "Any law or regulation to the contrary notwithstanding," the "alteration, renovation, rehabilitation, repair, maintenance, removal, or demolition of all buildings or structures already erected shall be regulated pursuant to the 'State Uniform Construction Code Act,'" and under 52:27D-139 local construction regulations were "deemed repealed and superseded" once the state code was promulgated. An owner may still choose an impact-rated roof covering. Everything above is New Jersey state law, the same in every municipality. The Mountainside Construction Department page and FAQs state nothing further on roof covering ratings.
Repair permit threshold
Mountainside's Construction Department FAQs (https://www.mountainside-nj.com/department/buildingzoningengineering/) say "A construction permit is also required to do the following" and list "Replace siding or roofing" among those jobs; the same FAQs give "Replacing gutters" as an example of "ordinary repairs which DO NOT require a permit" and do not list roofing there. The state rule below makes no such demand for a detached one- or two-family house, and this record does not decide whether the department's demand is lawful under it; in practice, expect the department to treat roofing as permit work, as its FAQs state. Under state law: No permit and no size limit for reroofing a detached one- or two-family house; a permit for every other building. N.J.A.C. 5:23-2.7(c) lists items that "are ordinary maintenance and shall be treated as such by every enforcing agency" and says "No permit for, inspections of, or notice to the enforcing agency of ordinary maintenance shall be required." Item 1.x is "The repair or replacement of existing roof covering on detached one- and two-family dwellings," with no square-footage or percentage cap. N.J.A.C. 5:23-2.14(b)1 carries this into the permit rule: "Ordinary maintenance as defined in N.J.A.C. 5:23-2.7 shall not require a permit or notice to the enforcing agency." Two limits apply. First, the item covers only detached one- and two-family dwellings. Reroofing a townhouse or other attached dwelling, or any other building, falls under the general permit rule, N.J.A.C. 5:23-2.14(a): "It shall be unlawful to construct, enlarge, repair, renovate, alter, reconstruct or demolish a structure ... without first filing an application with the construction official." Some of that work may be "minor work" under N.J.A.C. 5:23-2.17A, which still needs a permit, but "work may proceed, upon notice to the enforcing agency, before the permit is issued" (5:23-2.14(b)2). The fee is municipal: "The municipality, in accordance with this chapter, shall establish by ordinance enforcing agency fees" (N.J.A.C. 5:23-2.25; fee standards at 5:23-4.18). Second, ordinary maintenance does not include "Any work affecting structural or fire safety" (5:23-2.7(b)4), so roof work that reaches rafters, trusses or other structure needs a permit even on a detached house. The rule does not say whether replacing roof sheathing alone is such work. Everything after "Under state law:" is New Jersey state law, the same in every municipality.
Roof layer limit / recover
Two layers maximum, by state rule. Roof work on an existing building is held to the Rehabilitation Subcode (N.J.A.C. 5:23-2.4(a)), whose repair section, N.J.A.C. 5:23-6.4(e)7, reads: "Existing roof covering shall be removed before installing new roof covering when any of the following conditions occur: i. 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; ii. The existing roof covering is wood shake, slate, clay, cement or asbestos-cement tile; or iii. The existing roof has two or more applications of any type of roof covering." So one existing layer of asphalt shingles may be covered once; a roof that already has two layers, a wet or deteriorated roof, or a wood shake, slate, clay, cement or asbestos-cement tile roof must be torn off first. The answer is the same if a reroof is treated as renovation rather than repair: for work other than repair, N.J.A.C. 5:23-6.8(h)7 applies "All of Chapter 9 entitled 'Roof Assemblies', except Section R907" of the 2024 International Residential Code, and its reroofing section, R908.4, Exceptions, bars a recover "Where the existing roof has two or more applications of any type of roof covering." New Jersey's Chapter 9 amendments at N.J.A.C. 5:23-3.21(c)8 change only R903.4.1 and R905.1.2 and leave R908 as published. Everything above is New Jersey state law, the same in every municipality. The Mountainside Construction Department page and FAQs state nothing further on roof layers.
Sales & use tax
6.625% New Jersey Sales Tax; whether the roofing bill is taxed depends on the job. The Division of Taxation's guide Contractors and New Jersey Taxes (S&U-3, Rev. 5/25) refers to "New Jersey's 6.625% Sales Tax rate." A new roof is an exempt capital improvement: "New roof" is on the guide's list of "Exempt capital improvements," and "If the work results in an exempt capital improvement to real property, the contractor does not charge Sales Tax on the bill"; the owner gives the contractor a Certificate of Exempt Capital Improvement (Form ST-8). The roofer still pays tax on materials: "The contractor pays the Sales Tax on the cost of materials and supplies at the time of purchase." A repair is taxable. The guide lists "Fixing a leaky roof" among repairs and says "replacing a few loose bath tiles or a portion of a leaky roof is a repair to the existing real property. However, replacing all of the tiles or the entire roof with upgraded or improved materials would be an exempt capital improvement." On a taxable job the only deduction is a separately stated cost of materials, and "If the contractor does not itemize the materials and the labor for a taxable job, the entire receipt is subject to tax." Work for an exempt organization, a government agency or a qualified business in an Urban Enterprise Zone follows separate exemption rules. Everything above is New Jersey state law, the same in every municipality. The Mountainside Construction Department page states nothing further on sales tax.

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The Construction Department of the Borough of Mountainside, in Union County, works from Borough Hall at 1385 US Highway 22 East and issues building permits for residential, commercial and industrial construction in the Borough. Its Construction Department FAQs list replacing roofing among the jobs that need a construction permit, a demand the state rule does not make for a detached house. New Jersey's Uniform Construction Code, one code for the whole state, governs the work.

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Sources

Roofing questions: Borough of Mountainside, NJ

Do you need a permit to replace a roof in Borough of Mountainside, NJ?

Yes, a permit is required to replace a roof in Borough of Mountainside, NJ. Mountainside's Construction Department FAQs (https://www.mountainside-nj.com/department/buildingzoningengineering/) say "A construction permit is also required to do the following" and list "Replace siding or roofing" among those jobs; the same FAQs give "Replacing gutters" as an example of "ordinary repairs which DO NOT require a permit" and do not list roofing there. The state rule below makes no such demand for a detached one- or two-family house, and this record does not decide whether the department's demand is lawful under it; in practice, expect the department to treat roofing as permit work, as its FAQs state. Under state law: No permit and no size limit for reroofing a detached one- or two-family house; a permit for every other building. N.J.A.C. 5:23-2.7(c) lists items that "are ordinary maintenance and shall be treated as such by every enforcing agency" and says "No permit for, inspections of, or notice to the enforcing agency of ordinary maintenance shall be required." Item 1.x is "The repair or replacement of existing roof covering on detached one- and two-family dwellings," with no square-footage or percentage cap. N.J.A.C. 5:23-2.14(b)1 carries this into the permit rule: "Ordinary maintenance as defined in N.J.A.C. 5:23-2.7 shall not require a permit or notice to the enforcing agency." Two limits apply. First, the item covers only detached one- and two-family dwellings. Reroofing a townhouse or other attached dwelling, or any other building, falls under the general permit rule, N.J.A.C. 5:23-2.14(a): "It shall be unlawful to construct, enlarge, repair, renovate, alter, reconstruct or demolish a structure ... without first filing an application with the construction official." Some of that work may be "minor work" under N.J.A.C. 5:23-2.17A, which still needs a permit, but "work may proceed, upon notice to the enforcing agency, before the permit is issued" (5:23-2.14(b)2). The fee is municipal: "The municipality, in accordance with this chapter, shall establish by ordinance enforcing agency fees" (N.J.A.C. 5:23-2.25; fee standards at 5:23-4.18). Second, ordinary maintenance does not include "Any work affecting structural or fire safety" (5:23-2.7(b)4), so roof work that reaches rafters, trusses or other structure needs a permit even on a detached house. The rule does not say whether replacing roof sheathing alone is such work. Everything after "Under state law:" is New Jersey state law, the same in every municipality.

Can you roof over an existing roof in Borough of Mountainside, NJ?

Two layers maximum, by state rule. Roof work on an existing building is held to the Rehabilitation Subcode (N.J.A.C. 5:23-2.4(a)), whose repair section, N.J.A.C. 5:23-6.4(e)7, reads: "Existing roof covering shall be removed before installing new roof covering when any of the following conditions occur: i. 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; ii. The existing roof covering is wood shake, slate, clay, cement or asbestos-cement tile; or iii. The existing roof has two or more applications of any type of roof covering." So one existing layer of asphalt shingles may be covered once; a roof that already has two layers, a wet or deteriorated roof, or a wood shake, slate, clay, cement or asbestos-cement tile roof must be torn off first. The answer is the same if a reroof is treated as renovation rather than repair: for work other than repair, N.J.A.C. 5:23-6.8(h)7 applies "All of Chapter 9 entitled 'Roof Assemblies', except Section R907" of the 2024 International Residential Code, and its reroofing section, R908.4, Exceptions, bars a recover "Where the existing roof has two or more applications of any type of roof covering." New Jersey's Chapter 9 amendments at N.J.A.C. 5:23-3.21(c)8 change only R903.4.1 and R905.1.2 and leave R908 as published. Everything above is New Jersey state law, the same in every municipality. The Mountainside Construction Department page and FAQs state nothing further on roof layers.

Do roofing contractors need a license or registration in Borough of Mountainside, NJ?

Yes.

What building code does Borough of Mountainside, NJ use?

The 2024 International Residential Code, New Jersey edition, adopted by the State, with the Rehabilitation Subcode for work on existing buildings. New Jersey has one construction code, the Uniform Construction Code (N.J.A.C. 5:23), which every municipality enforces; municipalities do not adopt building codes of their own (N.J.S.A. 52:27D-123.1 and 52:27D-139). N.J.A.C. 5:23-3.21(a)1 adopts the International Code Council's "2024 International Residential Code known as the IRC/2024 as the one- and two-family dwelling subcode in New Jersey subject to the modifications stated at (c) below," and 3.21(b) applies it to "detached one- and two-family dwellings and townhouses not more than three stories above grade plane in height." The section was rewritten by R.2026 d.086, "effective August 17, 2026," in the Department of Community Affairs' print of the rules "adopted and published through the New Jersey Register, Vol. 58 No. 16," and the Department's Current Construction Codes page lists the "International Residential Code/2024, NJ ed" with an adoption date of Aug 17, 2026. Other buildings fall under the building subcode, the International Building Code/2024, NJ edition (N.J.A.C. 5:23-3.14). Roof work on an existing building is held to the Rehabilitation Subcode: "Existing structures, when repaired, renovated, altered or reconstructed, shall conform to the requirements of N.J.A.C. 5:23-6, Rehabilitation Subcode" (N.J.A.C. 5:23-2.4(a)). A six-month grace period follows the adoption. N.J.A.C. 5:23-1.6(a): "For a period of six months following the operative date of a subcode revision, applicants may submit a complete permit application, including all prior approvals, to be reviewed under the code in force immediately preceding the subcode revision." The rule history gives R.2026 d.086 no date other than its effective date, so on that reading the window runs from August 17, 2026 until about February 17, 2027: a complete application filed inside it may be reviewed under either the prior edition or the 2024 edition, at the applicant's choice, and one filed after it closes is reviewed under the 2024 edition. Everything above is New Jersey state law, the same in every municipality. Locally, the Mountainside Construction Department FAQs say inspections are made to ensure "that all construction is in accordance with the Uniform Construction Code of New Jersey and its adopted codes" and name no edition.

Is a mid-roof inspection required in Borough of Mountainside, NJ?

No. No mid-roof inspection under state law. Reroofing a detached one- or two-family house is ordinary maintenance, and N.J.A.C. 5:23-2.7(c) says "No permit for, inspections of, or notice to the enforcing agency of ordinary maintenance shall be required." Where a reroof does need a permit, N.J.A.C. 5:23-2.18(b)1 says "Inspections of one- and two-family dwellings for which construction must cease until the inspection is made shall be limited to the following": footing trenches, foundations, utility services and a mid-point inspection, whose building item is "All structural framing, connections, wall and roof sheathing, and insulation." The list names no roof-covering or underlayment stage, and the rule does not say whether its sheathing item reaches a permitted reroof that replaces sheathing. Any further inspection a municipality requires "shall be of the type and nature that construction may continue without interruption" (5:23-2.18(b)3). Everything above is New Jersey state law, the same in every municipality. Locally, the Mountainside Construction Department FAQs list building inspections for new work, including a "Rough inspection which includes all structural walls, floors and roofs prior to covering with finish or infill materials," and say "For renovations and projects other than new construction, contact the Construction Department for inspection requirements"; they name no roof-covering or mid-roof inspection for a reroof.