New Jersey runs a single statewide energy subcode under the Uniform Construction Code, not a home-rule patchwork - but several municipal construction offices enforce equipment-sizing documentation harder than the state minimum requires. Every claim on this page is checked against the state's own regulation text, bulletins, and posted local checklists - see the Verification Appendix.
Last verified September 5, 2026 against the sources linked above. Change log
New Jersey is structurally different from most of the states covered on this site. It is not a home-rule state for its base construction codes: the entire state builds to one Uniform Construction Code (UCC), codified at N.J.A.C. 5:23, administered by the Department of Community Affairs (DCA), Division of Codes and Standards. Municipal and county construction offices enforce the UCC locally - they do not adopt their own edition or their own amendments the way a city in Texas or Colorado can.
The UCC's energy subcode is set at N.J.A.C. 5:23-3.18. The current edition, adopted by rule amendment effective September 6, 2022 (R.2022 d.111), designates the 2021 International Energy Conservation Code (IECC/2021) as New Jersey's energy subcode, alongside ASHRAE Standard 90.1-2019 for the commercial side.1 The U.S. Department of Energy's own state profile confirms the same baseline from the federal side: Current State Code (Residential) = 2021 IECC, State Amendments = Yes, and "Can use COM/REScheck: Yes."2
Two separate provisions of the UCC govern a typical one- or two-family home project: the Energy Subcode (N.J.A.C. 5:23-3.18) for envelope and mechanical-efficiency compliance, and the One- and Two-Family Dwelling Subcode (N.J.A.C. 5:23-3.21), which is New Jersey's own edition of the 2021 IRC (the DCA refers to it internally as "IRC-N"). The energy subcode's residential provisions, IECC-R, parallel Chapter 11 of that IRC-N edition - so the numbers are the same whether you look them up through the energy subcode or through the dwelling subcode's own energy chapter.3
Every municipality in New Jersey has (or shares) a local construction office staffed by state-licensed construction officials and subcode officials, who review plans, issue permits, and perform inspections under the UCC. The Department itself performs plan review directly only in narrower cases - certain state-owned buildings and jurisdictions whose local officials lack the required certification class for a given project.4 For an ordinary residential project, your local construction office is the one reviewing your energy subcode documentation, and it is the one that decides which specific forms it wants attached to the application - more on that in Section 4.
New Jersey's energy subcode splits the state into two climate zones by county, spelled out directly in DCA's own Bulletin 22-1:5
DCA's own Construction Code Communicator notes that Mercer County moved from Zone 5A to Zone 4A under the 2021 code cycle - a small but real shift worth confirming if your project sits in central New Jersey and your design assumptions were built around the prior zone assignment.6
Because New Jersey is a single-code state, there is no city-by-city adoption table to build the way there is for Texas or Colorado. What actually varies here is narrower but still real: the grace period timing that applied during the 2021 code transition, and the specific documentation each local construction office wants attached to a permit application. Both are worth walking through in detail, because getting either wrong is exactly what produces a kicked-back submittal.
The 2021 IECC, along with the 2021 I-Codes generally and the 2020 National Electrical Code, was adopted September 6, 2022. DCA's own Fall 2022 Construction Code Communicator spells out the transition mechanics precisely: a six-month grace period applied from the adoption date, meaning any complete permit application submitted between September 6, 2022 and March 5, 2023 could still be reviewed under the prior code (the 2018 IECC-based subcode). March 5, 2023 was the last day to file under the old code; every permit application filed March 6, 2023 or later must use the 2021 IECC-R.7 If you are working from an older prototype plan set or an older REScheck run, this is the date that matters - not the September 2022 adoption date itself.
DCA's Bulletin 22-1 reproduces the prescriptive insulation and fenestration table directly, with the 2021 IECC's own published errata already applied. Here is what it requires for New Jersey's two climate zones:8
| Component | Zone 4A | Zone 5A |
|---|---|---|
| Fenestration U-factor, max | 0.30 | 0.30 |
| Skylight U-factor, max | 0.55 | 0.55 |
| Glazed fenestration SHGC, max | 0.40 | 0.40 |
| Ceiling R-value | R-60 | R-60 |
| Wood-frame wall R-value | R-30 or R-20+5ci or R-13+10ci or R-0+20ci | R-30 or R-20+5ci or R-13+10ci or R-0+20ci |
| Mass wall R-value | 8/13 | 13/17 |
| Floor R-value | R-19 | R-30 |
| Basement wall R-value | R-10ci or R-13 | R-15ci or R-19 or R-13+5ci |
| Slab R-value, depth | R-10ci, 4 ft | R-10ci, 4 ft |
| Crawlspace wall R-value | R-10ci or R-13 | R-15ci or R-19 or R-13+5ci |
Source: NJ DCA Bulletin 22-1, "Energy Subcode Compliance," Table R402.1.3 reproduction, revised June 2023.8 R-values are minimums; U-factors and SHGC are maximums. "13+10ci" means R-13 cavity insulation plus R-10 continuous insulation.
Mandatory air-leakage testing: for new construction other than an addition, documentation of an air leakage rate less than 3 air changes per hour at 50 Pascals (3 ACH50), tested per ANSI/RESNET/ICC 380, ASTM E779, or ASTM E1827, must be submitted with the project's envelope air-barrier and insulation inspection checklist (UCC Form F392).9 That checklist itself is a detailed, component-by-component air-barrier and insulation verification form your local subcode official signs off on.
Mandatory additional efficiency package: beyond the prescriptive or UA-trade-off envelope requirement, new construction other than additions must also include at least one energy-efficiency package selected from IECC Section R408: an enhanced envelope performance option, a more efficient HVAC equipment option, a reduced service water-heating energy option, a more efficient duct thermal distribution system option, or an improved air sealing and efficient ventilation system option.10 This is a real, easy-to-miss extra step: satisfying the envelope table alone is not sufficient for new construction.
The energy subcode compliance documentation generally must be signed and sealed by a design professional. Two exceptions exist: for Class 3 buildings (as defined at N.J.A.C. 5:23-4.3A(d)), the HVACR contractor may sign; and for a single-family detached dwelling where the homeowner resides or intends to reside, the homeowner may sign the energy code compliance documentation directly.11 That homeowner-signature allowance is unusually direct compared to many states and worth knowing if you are an owner-builder.
DCA's Bulletin 22-1 lists the accepted compliance methods for low-rise residential buildings directly, and they map closely to the paths used nationally:8
| Path | What it is | Best fit |
|---|---|---|
| Hand calculations | Calculate the U-value of each envelope component per the ASHRAE Handbook of Fundamentals and show each is at or better than code. | Simple assemblies where every component already clears the table on its own. |
| Prescriptive package | Meet every line of Table R402.1.3 for your climate zone directly, as published. | Standard framing, no unusual glazing, tight budget and timeline. |
| REScheck-web (UA trade-off) | Total envelope heat loss (UA) of the proposed design compared against a code-minimum reference home under Section R402.1.5; weak components can be offset by strong ones elsewhere. | 2x4 walls, large glazing packages, or a design that cannot clear every prescriptive line individually. |
| NJ Clean Energy Program | An above-code program (formerly NJ ENERGY STAR Homes) administered through the NJ Board of Public Utilities; a builder's acknowledgment letter is submitted with the permit, and Section R403 systems compliance is still verified by the local construction office. | Projects already pursuing NJ Clean Energy Program incentives. |
| Total Building Performance / ERI | Full simulated-performance path under Section R405, or the Energy Rating Index path under Section R406. | Custom homes or designs the prescriptive and UA paths cannot cleanly capture. |
DCA's own guidance is explicit that REScheck-web is the most commonly used method to demonstrate compliance with the energy subcode, and that other DOE-recognized building energy software tools can also be used as long as they determine compliance with the IECC-R's building envelope and HVAC requirements.8 For most residential projects moving through a New Jersey construction office, REScheck-web run against the 2021 IECC-R and the correct county climate zone is the fastest, most familiar path for a plan reviewer to check.
What about Manual J? New Jersey's One- and Two-Family Dwelling Subcode is New Jersey's own 2021-IRC-based edition, which carries the same equipment-sizing mandate as the national code: heating and cooling equipment sized per ACCA Manual S based on building loads calculated per ACCA Manual J or another approved method. That requirement sits in the dwelling subcode itself, independent of which envelope compliance path you choose for the energy subcode.
Manual S enforcement goes further than the state minimum in a number of New Jersey construction offices. This is the single most useful thing to know before you submit a New Jersey HVAC or new-construction permit application. The statewide dwelling subcode requires equipment sizing per Manual S based on Manual J loads (the same national baseline covered on every state page on this site) - but several New Jersey municipalities have built that requirement directly into their own posted permit checklists, and they check for it at the counter rather than waiting for a field question.
None of these are unusual or non-standard requirements - they are simply construction offices enforcing the equipment-sizing chain (Manual J loads feeding Manual S selection feeding Manual D duct design) as a documented submittal rather than a field spot-check. The practical lesson: do not assume a bare Manual J load calculation is sufficient paperwork for a New Jersey HVAC permit just because the state-level code text only names M1401.3. Check your specific construction office's posted checklist, or send us the plans and the municipality and we will confirm what that office wants attached.
The abridged NJ1AE form exists as an alternative to a full Manual J in some cases. Point Pleasant Borough's checklist names "Manual J1 or NJ1AE form" as an acceptable pairing - NJ1AE is a New Jersey-specific abridged energy/load worksheet some construction offices accept for straightforward replacement or smaller projects. Whether your project qualifies for an abridged form instead of a full room-by-room Manual J is a local-office judgment call, not a statewide rule; confirm it with your construction official before assuming either path.
New Jersey is not home rule - but the paperwork still isn't uniform. Because the energy subcode and dwelling subcode are single statewide editions, you will never encounter a New Jersey town enforcing an older or newer IECC edition than its neighbor the way you can in Texas or Colorado. What differs, construction office to construction office, is which specific forms, checklists, and submittal sequencing each one has built around the same statewide code - the Manual S-with-Manual-J pattern above being the clearest example.
The homeowner-signature allowance is genuinely useful for owner-builders. Where most states require a design professional's seal on energy code compliance documentation, New Jersey lets an owner-occupant of a single-family detached dwelling sign the energy code compliance paperwork directly, without an architect or engineer's seal. That does not remove the substantive requirement to actually comply with the 2021 IECC-R and the M1401.3 equipment-sizing mandate - it only changes who can sign the form.
What to ask your local construction office before you finalize a compliance strategy:
What energy code does New Jersey use for residential permits? New Jersey's UCC energy subcode, N.J.A.C. 5:23-3.18, adopted the 2021 IECC as the state's energy subcode on September 6, 2022.1 For one- and two-family dwellings, compliance follows the residential portion (IECC-R), which parallels Chapter 11 of the 2021 IRC. A six-month grace period let applications filed through March 5, 2023 use the prior code; every permit application filed on or after March 6, 2023 must use the 2021 IECC-R. New Jersey is not home rule for the base subcodes - this edition applies statewide.
Will a REScheck report be accepted for a New Jersey permit? Yes. DOE lists New Jersey as "Can use COM/REScheck: Yes,"2 and the state's own Bulletin 22-1 names REScheck-web directly as the most commonly used compliance method for low-rise residential buildings.8 Run it against the 2021 IECC-R with the correct climate zone (4A or 5A) for your county.
Does New Jersey require Manual S in addition to Manual J? The statewide dwelling subcode requires equipment sizing per Manual S based on Manual J loads under Section M1401.3, same as every state that has adopted a recent IRC edition. Several New Jersey construction offices - Point Pleasant Borough, Florham Park, Mendham Township, and Voorhees Township among them - go further and name Manual S and Manual D as required submittals on their own posted HVAC and mechanical-permit checklists, not just something to have available if asked.12
Is a Manual J load calculation required for a New Jersey HVAC permit? Yes. New Jersey's dwelling subcode is based on the 2021 IRC, which carries Section M1401.3: equipment sized per Manual S based on loads from Manual J or another approved method. Several municipal checklists require the Manual J (or the state's abridged NJ1AE alternative) submitted with the application itself.
Who prepares these reports? Travis Smith, The Plans Examiner. He holds the same certification your building department's plan reviewer holds; the specifics are at the end of this page.
My New Jersey municipality isn't named on this page - what do I do? New Jersey's energy subcode is a single statewide edition, so the code itself does not vary by town. What varies is which forms each local construction office wants attached to the application. Tell us your municipality and county when you order a report and we will confirm the local checklist and correct climate zone before we run anything.
Need a REScheck report matched to the 2021 IECC-R? The most common way a New Jersey REScheck submittal gets kicked back is an old code year still baked into a reused template - a report run against the pre-2023 subcode will not clear a construction office that has been reviewing under the 2021 IECC-R since March 6, 2023. We confirm your project's climate zone and the current subcode edition before running the report. A REScheck report is $149, delivered ready to attach to your permit application.
Need a Manual J load calculation, with Manual S? IRC M1401.3 ties equipment sizing to a documented Manual J everywhere in New Jersey, and a real number of municipal construction offices - Point Pleasant Borough, Florham Park, Mendham Township, and Voorhees Township among the ones checked for this page - expect Manual S (and Manual D, where ductwork is involved) submitted alongside it, not produced only if a reviewer asks. A room-by-room Manual J report gives you defensible equipment sizing your HVAC contractor and construction office can both stand behind. A Manual J report is $249.
Need both? The combined Manual J + REScheck package is $349 - one submission covering both the equipment-sizing requirement under the dwelling subcode and the envelope/compliance requirement under the 2021 IECC-R.
Every report comes with the same guarantee: accepted by your building department, or we revise it free until it clears.
Contact us with your plans and the municipality and county where you're pulling the permit, and we'll confirm the climate zone, the current subcode edition, and whether that construction office's checklist expects Manual S and Manual D submitted alongside Manual J.
Every claim on this page was checked directly against New Jersey's own regulation text, DCA bulletins and publications, or a municipal construction office's own posted checklist during this research pass - not a national aggregator or a secondary blog summary, except where explicitly noted below.
N.J.A.C. 5:23-3.18 adopts the 2021 IECC as New Jersey's energy subcode, effective September 6, 2022. VERIFIED (primary source). The regulation text itself (law.cornell.edu / rbl.ms reproduction) states the amendment adopting "International Energy Conservation Code/2021 (IECC/2021), as the energy subcode for New Jersey," amended by R.2022 d.111, effective September 6, 2022.1
DOE "Can use COM/REScheck" = Yes for New Jersey; Current State Code (Residential) = 2021 IECC, State Amendments = Yes. VERIFIED. energycodes.gov/status/states/new-jersey's own State Profile table.2
Six-month grace period; March 5, 2023 last day to file under the prior code; March 6, 2023 the 2021 IECC-R became mandatory. VERIFIED (primary source). NJ DCA Construction Code Communicator, Fall 2022, "Grace Period for 2021/2020 Model Codes" section, states this timeline directly, including the distinction between the I-Codes/NEC cutoff (March 5, 2023) and the NSPC cutoff (March 18, 2023).7
Climate zones 4A and 5A, with the county list including Mercer's move from 5A to 4A. VERIFIED (primary source). Both NJ DCA Bulletin 22-1 and the Fall 2022 Construction Code Communicator list the identical county-to-zone assignment and note the Mercer County change directly.5
Table R402.1.3 prescriptive values for Zones 4A and 5A. VERIFIED (primary source, state-reproduced). Pulled directly from NJ DCA Bulletin 22-1's own reproduction of the table, which states it reflects the 2021 IECC-R errata.8
3 ACH50 air-leakage threshold for new construction other than additions, tested per ANSI/RESNET/ICC 380, ASTM E779, or ASTM E1827. VERIFIED (primary source). Confirmed directly against UCC Form F392 (Air Barrier and Insulation Inspection Checklist), reproduced within Bulletin 22-1's supporting materials.9
R408 additional energy-efficiency package required for new construction other than additions, one of five options. VERIFIED (primary source). Bulletin 22-1 lists all five options by name directly.10
Design professional sign-off requirement, with exceptions for Class 3 buildings (HVACR contractor) and owner-occupied single-family detached dwellings (homeowner). VERIFIED (primary source). Bulletin 22-1 states this directly.11
REScheck-web named as the most commonly used compliance method; other DOE-recognized tools also acceptable if they check the IECC-R envelope and HVAC requirements. VERIFIED (primary source). Bulletin 22-1 states this directly, including the buildingenergysoftwaretools.com reference for alternative tools.8
Point Pleasant Borough HVAC System Plan Review Checklist requires Manual J1 or NJ1AE, Manual S, and Manual D, with a dedicated Manual S yes/no line under IRC 1401.3. VERIFIED (primary source), re-fetched directly for this page. ptboro.com's own posted PDF checklist.12
Florham Park requires Manuals J, S, and D submitted and on site for inspections for new construction and additions. VERIFIED (primary source), re-fetched directly for this page. florhamparknj.gov's own posted Air-Conditioning Replacement Packet PDF.13
Mendham Township requires Manuals J, S, and D on new HVAC applications, with a plain-language description of each manual. VERIFIED (primary source), re-fetched directly for this page. mendhamnj.org's own posted HVAC guidelines page.14
Voorhees Township residential permit checklist instructs applicants to submit Manual J, S, and D under mechanical subcode documents. VERIFIED (primary source), re-fetched directly for this page. voorheesnj.com's own posted checklist PDF.15
New Jersey's UCC subcodes (building, energy, dwelling, mechanical) are state-adopted and administered by DCA, not separately adopted by each municipality. VERIFIED, standing structural fact. Consistent across N.J.A.C. 5:23-2.15, the DCA plan review guidance, and every jurisdiction-level source checked for this page - no New Jersey municipality checked for this page enforces a different IECC or IRC edition than the state's own subcode.
What remains genuinely unconfirmed: the exact checklist requirements for New Jersey's hundreds of remaining municipal construction offices beyond the five checked directly for this page; whether every office that requires Manual S submission also requires it be produced in a specific software output format; and whether any New Jersey construction office has adopted the NJ Clean Energy Program above-code path as its de facto default rather than an opt-in. Confirm any of these directly with the relevant construction office before finalizing a compliance strategy.
This page summarizes New Jersey's statewide UCC energy subcode and five municipal construction-office checklists for general guidance. Because specific submittal requirements can still vary construction office to construction office even under a single statewide code, requirements for any specific municipality not named here may differ. Always confirm current requirements with your local construction official before finalizing design or bidding.
VERIFIED (primary source): N.J.A.C. 5:23-3.18, Energy subcode, amended by R.2022 d.111, effective September 6, 2022, adopting IECC/2021. ↩↩↩
VERIFIED (primary source): U.S. Department of Energy, Building Energy Codes Program, "New Jersey | State Profile," energycodes.gov/status/states/new-jersey. ↩↩↩
NJ DCA Bulletin 22-1, "Energy Subcode Compliance" (Revised June 2023), describing the relationship between the Energy Subcode's residential provisions (IECC-R) and Chapter 11 of the One- and Two-Family Dwelling Subcode. ↩
N.J.A.C. 5:23-2.15 and NJ DCA "Plan Review" guidance (nj.gov/dca/codes/forms/pdf_bcpr/pr_app_guide.pdf) describing the Department's Bureau of Construction Project Review role for Class I and Class II jurisdictions. ↩
VERIFIED (primary source): NJ DCA Bulletin 22-1, county-to-climate-zone list. ↩↩
NJ DCA Construction Code Communicator, Fall 2022, "Energy Subcode Updates for the 2021 Codes," noting Mercer County's move from Zone 5A to Zone 4A. ↩
VERIFIED (primary source): NJ DCA Construction Code Communicator, Fall 2022, "Grace Period for 2021/2020 Model Codes," nj.gov/dca/codes/publications/pdf_ccc/CCC_Fall_2022.pdf. ↩↩
VERIFIED (primary source): NJ DCA Bulletin 22-1, "Energy Subcode Compliance" (Revised June 2023), nj.gov/dca/codes/publications/pdf_bulletins/b_22_1.pdf. ↩↩↩↩↩↩↩
VERIFIED (primary source): UCC Form F392, Air Barrier and Insulation Inspection Checklist, reproduced within NJ DCA Bulletin 22-1's supporting materials; 3 ACH50 threshold per ANSI/RESNET/ICC 380, ASTM E779, or ASTM E1827 at 50 Pa. ↩↩
VERIFIED (primary source): NJ DCA Bulletin 22-1, R408 additional energy-efficiency package list (five options). ↩↩
VERIFIED (primary source): NJ DCA Bulletin 22-1, design professional sign-off requirement and exceptions (N.J.A.C. 5:23-4.3A(d) Class 3 buildings; owner-occupied single-family detached dwellings). ↩↩
VERIFIED (primary source), re-fetched directly for this page: Point Pleasant Borough, NJ, HVAC System Plan Review Checklist, ptboro.com/wp-content/uploads/2023/05/HVAC-PLAN-REVIEW-CHECKLIST.pdf. ↩↩↩
VERIFIED (primary source), re-fetched directly for this page: Florham Park, NJ, Air-Conditioning Replacement Packet, florhamparknj.gov/media/Building/Forms_Applications/Air-Conditioning-Replacement-Packet.pdf. ↩↩
VERIFIED (primary source), re-fetched directly for this page: Mendham Township, NJ, "Air Conditioner/HVAC Guidelines," mendhamnj.org/cn/webpage.cfm?tpid=18334. ↩↩
VERIFIED (primary source), re-fetched directly for this page: Voorhees Township, NJ, residential permit submittal checklist, voorheesnj.com/wp-content/uploads/2025/02/CHECK-LIST-FOR-RESIDENTIAL-PERMIT-Revised-2.pdf. ↩↩
Travis Smith, ICC-Certified Residential Plans Examiner. The same certification your building department's plan reviewer holds - working for you.