The median home in Piscataway was built in 1975; there are 18,289 of them. What the code requires when that roof is replaced, and who signs off, is below.
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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 56% of Piscataway’s homes that are detached; twins, rowhouses, townhouses and structural work are outside it.
Source: N.J.A.C. 5:23-2.7
Layers
Which layers may stay is a Rehabilitation Subcode question in New Jersey (the IRC definitions are deleted by N.J.A.C. 5:23-3.21), and this site has not read that subcode yet. With 57% of Piscataway’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). For Piscataway, ask whether the quote includes one anyway.
Source: N.J.A.C. 5:23-3.21; NJ DCA Bulletin 07-3
Checked against the code text on October 24, 2026. Everything else the state requires: roof replacement in New Jersey.
64% of the occupied homes in Piscataway are lived in by their owners: 11,272 households, the people this line is for. Counting by decade, 5% before 1940, 22% before 1960, 57% before 1980 of the housing was in place, and 17% dates from 2000 on. (ACS 2020–2024.)
The housing is 56% detached houses, 8% attached single-family houses (rowhouses, twins and townhouses), 9% buildings of two to four units.
Of the 25 Middlesex County municipalities on this site, Piscataway has the 17th largest share of homes built before 1980: 57%, against a county range of 26% to 88%.
ZIP codes: 08854
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Piscataway | 1975 | 57% | 64% | 8% | 11 |
| Middlesex | 1965 | 73% | 74% | 9% | 11 |
| Dunellen | 1955 | 88% | 61% | 1% | 11 |
| South Plainfield | 1964 | 71% | 86% | 6% | 11 |
| Highland Park | 1962 | 73% | 40% | 7% | 10 |
| South Bound Brook | 1966 | 77% | 58% | 7% | 11 |
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 Piscataway, hail of an inch or more was reported on 11 days between 2006 and 2025, the biggest stones 1.75 in on September 9, 2023.
At the county level, Piscataway shares Middlesex County’s record of 8 storm disaster declarations since 2006, the newest DR-4614 (Remnants of Hurricane Ida, September 2021). (OpenFEMA.)
Storm reports are what observers logged, not a measure of damage to any roof. When wind or hail damage means a new roof.
HUD’s useful-life figures are for planning; a warranty is a separate promise. For Piscataway’s houses: 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; 56% 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 | Low pitches and long runs | A complete standing-seam system may go over the old roof (R908.3.1) |
| Slate | 75 years | Older houses; 5% here predate 1940 | Sound slate can be reused (R908.5); broken slate cannot |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | Coating is not a replacement |
New Jersey had 47,473 active home improvement registrations in October 2026; the one belonging to whoever quotes your roof in Piscataway should be on the contract (N.J.S.A. 56:8-144).
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in New Jersey.
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 56% of Piscataway’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 Piscataway was built in 1975, 57% of homes were built before 1980, 64% are owner-occupied.
Hail of 1 inch or larger was reported on 11 days within 10 miles of Piscataway from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
New Jersey had 47,473 active home improvement registrations in October 2026; the one belonging to whoever quotes your roof in Piscataway should be on the contract (N.J.S.A. 56:8-144).
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.