The median home in Robbinsville was built in 1992; there are 6,033 of them. 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
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 49% of Robbinsville’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 19% of Robbinsville’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
The state code’s ice barrier applies where the average January day is 25 °F or colder: Sussex County, per DCA Bulletin 07-3. Robbinsville is outside it, so whether to add one is up to you and the installer.
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.
80% of the occupied homes in Robbinsville are lived in by their owners: 4,673 households, the people this line is for. By year built, 6% before 1960, 19% before 1980; 29% went up in 2000 or later. (ACS 2020–2024.)
By building type: 49% detached houses, 27% attached single-family houses (rowhouses, twins and townhouses), 5% buildings of two to four units.
Of the 12 Mercer County municipalities on this site, Robbinsville has the smallest share of homes built before 1980: 19%, against a county range of 19% to 79%.
ZIP codes: 08561 · 08691
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Robbinsville | 1992 | 19% | 80% | 27% | 9 |
| Allentown | 1955 | 87% | 72% | 8% | 10 |
| East Windsor | 1976 | 60% | 61% | 23% | 10 |
| Hamilton Township, Mercer County | 1964 | 75% | 72% | 10% | 10 |
| Hightstown | 1950 | 76% | 72% | 9% | 10 |
| West Windsor | 1990 | 23% | 65% | 10% | 9 |
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 9 separate days within 10 miles of Robbinsville; the largest was 1.5 in on April 1, 2023.
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 Robbinsville, not that it damaged a 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 Robbinsville’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; 49% 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 | Standing seam that carries its own loads can skip the tear-off (R908.3.1) |
| Slate | 75 years | Older and historic houses | Never a base for a new layer (R908.3.1.1); heavy |
| Flat roof: EPDM or TPO | 15 years | Low-slope roofs and rear sections (27% of homes here are attached) | 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 Robbinsville should be on the contract (N.J.S.A. 56:8-144).
The price side is in what a new roof costs in New Jersey; the paperwork side in checking a roofing contractor.
None for a detached one- or two-family 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 49% of Robbinsville’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 Robbinsville was built in 1992, 19% of homes were built before 1980, 80% are owner-occupied.
Hail of 1 inch or larger was reported on 9 days within 10 miles of Robbinsville 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 Robbinsville 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.