Hopewell Township has 6,612 homes, and half of them were standing by 1977. Below: what the code asks of a replacement here, the permit, and the town’s own records.
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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
Replacing the covering on a detached one- or two-family house needs no permit and no notice to the town (N.J.A.C. 5:23-2.7). That covers the 86% of Hopewell Township’s homes that are detached; twins, rowhouses, townhouses and structural work are outside it.
Source: N.J.A.C. 5:23-2.7
Layers
The state strikes the IRC reroof definitions from its code (N.J.A.C. 5:23-3.21) and leaves existing houses to the Rehabilitation Subcode, not yet checked here. 53% of Hopewell Township’s homes were built before 1980, so get the layer count and a tear-off price in writing.
Source: N.J.A.C. 5:23-3.21
Ice barrier
New Jersey requires the eave membrane only where January averages 25 °F or colder, which the state says is Sussex County (DCA Bulletin 07-3). In Hopewell Township 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. The state’s code edition and the rest of its rules: roof replacement in New Jersey.
Of 6,288 occupied homes in Hopewell Township, 5,735 (91%) are owner-occupied. By year built, 12% before 1940, 29% before 1960, 53% before 1980; 10% went up in 2000 or later. (ACS 2020–2024.)
By building type: 86% detached houses, 9% attached single-family houses (rowhouses, twins and townhouses).
Of the 12 Mercer County municipalities on this site, Hopewell Township has the 9th largest share of homes built before 1980: 53%, against a county range of 19% to 79%.
ZIP codes: 08525 · 08534 · 08560
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Hopewell Township, Mercer County | 1977 | 53% | 91% | 9% | 8 |
| Pennington | 1953 | 71% | 82% | 10% | 13 |
| Hopewell Borough | 1938 | 79% | 76% | 7% | 11 |
| West Amwell | 1975 | 54% | 89% | 2% | 10 |
| East Amwell | 1971 | 74% | 83% | 4% | 10 |
| Lawrence Township, Mercer County | 1979 | 51% | 68% | 19% | 10 |
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.
Since 2006 the National Weather Service has logged hail of 1 inch or larger on 8 separate days within 10 miles of Hopewell Township; the largest was 1.75 in on July 23, 2008. The most recent was April 1, 2023.
That is fewer than most places in the state on this site (median 11 days).
Remnants of Hurricane Ida (DR-4614, September 2021) is the latest of 9 federal storm declarations covering Mercer County since 2006. (OpenFEMA.)
A report says hail fell near Hopewell Township, 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; 86% 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 | Simple roofs with long, unbroken slopes | Standing seam that carries its own loads can skip the tear-off (R908.3.1) |
| Slate | 75 years | Older houses; 12% here predate 1940 | Can’t be roofed over; check the framing for the weight |
| Flat roof: EPDM or TPO | 15 years | Porches, additions, low-slope rears | Where the roof meets a wall or parapet |
Ask a roofer working in Hopewell Township for the New Jersey home improvement registration number, which the law requires on contracts and advertising (N.J.S.A. 56:8-138, 56:8-144), and look it up with the Division of Consumer Affairs.
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. Replacing the covering on a detached one- or two-family house needs no permit and no notice to the town (N.J.A.C. 5:23-2.7). That covers the 86% of Hopewell Township’s homes that are detached; twins, rowhouses, townhouses and structural work are outside it.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Hopewell Township was built in 1977, 53% of homes were built before 1980, 91% are owner-occupied.
Hail of 1 inch or larger was reported on 8 days within 10 miles of Hopewell Township from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
Ask a roofer working in Hopewell Township for the New Jersey home improvement registration number, which the law requires on contracts and advertising (N.J.S.A. 56:8-138, 56:8-144), and look it up with the Division of Consumer Affairs.
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.