Mount Olive has 11,418 homes, and half of them were standing by 1978. The rules below decide how much of the old roof has to come off and what goes under the new one.
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
New Jersey treats a new covering on a detached one- or two-family house as ordinary maintenance: no permit, no notice (N.J.A.C. 5:23-2.7). That covers the 59% of Mount Olive’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. 54% of Mount Olive’s homes were built before 1980: ask how many layers yours has and whether the price is for a tear-off to the deck.
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). Mount Olive 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. Code edition, permit and contract rules for the whole state: roof replacement in New Jersey.
Owners live in 6,821 of Mount Olive’s occupied homes, or 61%. By year built, 5% before 1940, 19% before 1960, 54% before 1980; 21% went up in 2000 or later. (ACS 2020–2024.)
By building type: 59% detached houses, 4% attached single-family houses (rowhouses, twins and townhouses), 8% buildings of two to four units.
Of the 39 Morris County municipalities on this site, Mount Olive has the 33rd largest share of homes built before 1980: 54%, against a county range of 42% to 87%.
ZIP codes: 07828 · 07836
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Mount Olive | 1978 | 54% | 61% | 4% | 11 |
| Netcong | 1954 | 87% | 58% | 4% | 13 |
| Stanhope | 1967 | 74% | 86% | 14% | 12 |
| Hackettstown | 1967 | 68% | 58% | 7% | 7 |
| Roxbury | 1971 | 65% | 88% | 4% | 14 |
| Allamuchy | 1983 | 45% | 83% | 44% | 7 |
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 11 separate days within 10 miles of Mount Olive; the largest was 1.75 in on July 7, 2013. The most recent was September 8, 2023.
Federal major-disaster declarations for storms in Morris County since 2006: 11, most recently DR-4614, Remnants of Hurricane Ida, declared September 2021. (OpenFEMA.)
A report says hail fell near Mount Olive, 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 Mount Olive’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; 59% 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 houses; 5% 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 | Seams at walls and drainage |
New Jersey had 47,473 active home improvement registrations in October 2026; the one belonging to whoever quotes your roof in Mount Olive 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.
Detached houses: no permit, no notice. New Jersey treats a new covering on a detached one- or two-family house as ordinary maintenance: no permit, no notice (N.J.A.C. 5:23-2.7). That covers the 59% of Mount Olive’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 Mount Olive was built in 1978, 54% of homes were built before 1980, 61% are owner-occupied.
Hail of 1 inch or larger was reported on 11 days within 10 miles of Mount Olive 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 Mount Olive 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.