Half of the 877 homes in Frelinghuysen were built before 1983. What the code requires when that roof is replaced, and who signs off, is below.
New Roofing Costs connects homeowners with independent local roofing contractors. We do not perform roofing work.
This number connects homeowners who are planning a new roof or a full roof replacement with independent local roofing contractors. It is not for leak repairs or patch jobs. The call must come from the homeowner who decides on the roof. Calls may be recorded.
Permit
Under N.J.A.C. 5:23-2.7 a reroof of a detached one- or two-family house goes ahead without a permit or a notice to the construction office. In Frelinghuysen, 99% of homes are detached. An attached house, or work on rafters and beams, is not covered.
Source: N.J.A.C. 5:23-2.7
Layers
New Jersey deletes the IRC’s reroofing definitions (N.J.A.C. 5:23-3.21(c)2.xxii); its layer rule for existing houses is in the Rehabilitation Subcode, which this site has not read yet. With 43% of Frelinghuysen’s homes were built before 1980, ask the contractor to count the layers before quoting.
Source: N.J.A.C. 5:23-3.21
Ice barrier
Only Sussex County meets New Jersey’s 25 °F January test for a required ice barrier (N.J.A.C. 5:23-3.21; DCA Bulletin 07-3). In Frelinghuysen it is the installer’s and the manufacturer’s call; ask whether the quote includes it.
Source: N.J.A.C. 5:23-3.21; NJ DCA Bulletin 07-3
Rules as read on October 24, 2026. Code edition, permit and contract rules for the whole state: roof replacement in New Jersey.
Owners live in 781 of Frelinghuysen’s occupied homes, or 93%. By year built, 19% before 1940, 27% before 1960, 43% before 1980; 8% went up in 2000 or later. (ACS 2020–2024.)
By building type: 99% detached houses.
Of the 22 Warren County municipalities on this site, Frelinghuysen has the 19th largest share of homes built before 1980: 43%, against a county range of 24% to 89%.
ZIP codes: 07846
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Frelinghuysen | 1983 | 43% | 93% | 0% | 4 |
| Allamuchy | 1983 | 45% | 83% | 44% | 7 |
| Green | 1978 | 58% | 98% | 2% | 9 |
| Blairstown | 1975 | 62% | 95% | 2% | 9 |
| Independence | 1986 | 39% | 83% | 29% | 6 |
| Hope | 1972 | 62% | 88% | 2% | 4 |
Median built: median year the homes were built. Before 1980: share of homes built then. Owners: share of homes that are owner-occupied. Row, twin: share of homes that are rowhouses, twins or townhouses. Census ACS 2020–2024. Hail days: days with hail of 1 inch or larger within 10 miles, 2006–2025, NOAA Storm Prediction Center.
Within 10 miles of Frelinghuysen, hail of an inch or more was reported on 4 days between 2006 and 2025, the biggest stones 1 in on July 6, 2021.
That is fewer than most places in the state on this site (median 11 days).
Federal major-disaster declarations for storms in Warren County since 2006: 10, most recently DR-4725, Severe Storm and Flooding, declared August 2023. (OpenFEMA.)
A report says hail fell near Frelinghuysen, not that it damaged a roof. When wind or hail damage means a new roof.
Lifespans come from HUD’s capital-needs table, not from a brochure. More in the guides to shingles, metal, slate and flat roofs.
| Material | HUD useful life | Fits a house like | Watch for |
|---|---|---|---|
| Asphalt shingles | 20 years | Most pitched roofs; 99% of homes here are detached | Wind class set by the design wind speed (IRC Table R905.2.4.1) |
| Metal (standing seam, panels) | 50 years | Roofs that will carry solar later | Standing seam that carries its own loads can skip the tear-off (R908.3.1) |
| Slate | 75 years | Older houses; 19% here predate 1940 | Never a base for a new layer (R908.3.1.1); heavy |
| Flat roof: EPDM or TPO | 15 years | Porches, additions, low-slope rears | Where the roof meets a wall or parapet |
Any business offering home improvements in Frelinghuysen must be registered with the New Jersey Division of Consumer Affairs, with the number on its contracts and ads (N.J.S.A. 56:8-138, 56:8-144); 47,473 registrations were active in October 2026.
The price side is in what a new roof costs in New Jersey; the paperwork side in checking a roofing contractor.
No permit for a detached house. Under N.J.A.C. 5:23-2.7 a reroof of a detached one- or two-family house goes ahead without a permit or a notice to the construction office. In Frelinghuysen, 99% of homes are detached. An attached house, or work on rafters and beams, is not covered.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Frelinghuysen was built in 1983, 43% of homes were built before 1980, 93% are owner-occupied.
Hail of 1 inch or larger was reported on 4 days within 10 miles of Frelinghuysen from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
Any business offering home improvements in Frelinghuysen must be registered with the New Jersey Division of Consumer Affairs, with the number on its contracts and ads (N.J.S.A. 56:8-138, 56:8-144); 47,473 registrations were active in October 2026.
The full list: before you call.
Checked October 24, 2026. Laws and code editions change; the date says when these were last read at the source.