Half of the 1,856 homes in Mendham Borough were built before 1972. 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
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 80% of Mendham Borough’s homes that are detached; twins, rowhouses, townhouses and structural work are outside it.
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 73% of Mendham Borough’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 Mendham Borough 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 1,548 of Mendham Borough’s occupied homes, or 86%. By year built, 17% before 1940, 30% before 1960, 73% before 1980; 9% went up in 2000 or later. (ACS 2020–2024.)
By building type: 80% detached houses, 14% attached single-family houses (rowhouses, twins and townhouses).
Of the 39 Morris County municipalities on this site, Mendham Borough has the 7th largest share of homes built before 1980: 73%, against a county range of 42% to 87%.
ZIP codes: 07945
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Mendham Borough | 1972 | 73% | 86% | 14% | 13 |
| Bernardsville | 1960 | 71% | 95% | 2% | 10 |
| Mendham Township | 1976 | 56% | 96% | 0% | 14 |
| Peapack and Gladstone | 1970 | 65% | 80% | 2% | 6 |
| Chester Township | 1981 | 48% | 96% | 5% | 10 |
| Chester Borough | 1971 | 63% | 79% | 5% | 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.
NOAA’s storm reports show 13 days since 2006 with hail of at least 1 inch inside a 10-mile circle around Mendham Borough, topping out at 1.75 in on July 7, 2013. The most recent was August 6, 2024.
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 Mendham Borough, 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 Mendham Borough’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; 80% 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; 17% 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 |
Ask a roofer working in Mendham Borough 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.
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 80% of Mendham Borough’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 Mendham Borough was built in 1972, 73% of homes were built before 1980, 86% are owner-occupied.
Hail of 1 inch or larger was reported on 13 days within 10 miles of Mendham Borough 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 Mendham Borough 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.