Randolph has 9,349 homes, and half of them were standing by 1977. 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). Attached houses (7% of Randolph’s homes) and any work that touches the structure fall outside the rule.
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. With 56% of Randolph’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. In Randolph 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
Checked against the code text on October 24, 2026. Everything else the state requires: roof replacement in New Jersey.
Of 9,110 occupied homes in Randolph, 7,092 (78%) are owner-occupied. Counting by decade, 20% before 1960, 56% before 1980 of the housing was in place, and 11% dates from 2000 on. (ACS 2020–2024.)
The housing is 74% detached houses, 7% attached single-family houses (rowhouses, twins and townhouses), 9% buildings of two to four units.
Of the 39 Morris County municipalities on this site, Randolph has the 32nd largest share of homes built before 1980: 56%, against a county range of 42% to 87%.
ZIP codes: 07869
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Randolph | 1977 | 56% | 78% | 7% | 12 |
| Mine Hill | 1966 | 71% | 90% | 11% | 11 |
| Mendham Township | 1976 | 56% | 96% | 0% | 14 |
| Victory Gardens | 1972 | 65% | 33% | 21% | 11 |
| Dover | 1954 | 76% | 46% | 14% | 12 |
| Wharton | 1965 | 72% | 59% | 16% | 13 |
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 12 days since 2006 with hail of at least 1 inch inside a 10-mile circle around Randolph, topping out at 1.75 in on July 7, 2013. The most recent was September 9, 2023.
Morris County has had 11 federal major-disaster declarations for storms since 2006; the latest was 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.
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; 74% 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 | Roofs that will carry solar later | A complete standing-seam system may go over the old roof (R908.3.1) |
| Slate | 75 years | Older and historic houses | Sound slate can be reused (R908.5); broken slate cannot |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | 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 Randolph 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.
None for a detached one- or two-family house. 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). Attached houses (7% of Randolph’s homes) and any work that touches the structure fall outside the rule.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Randolph was built in 1977, 56% of homes were built before 1980, 78% are owner-occupied.
Hail of 1 inch or larger was reported on 12 days within 10 miles of Randolph 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 Randolph 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.