Permit
Expect a building permit
The residential code’s permit-exempt list (R105.2) has no roofing line. In Mendon the building department takes the application, with the contractor’s home improvement registration on it.
Roof Replacement in Mendon, MA
The median home in Mendon was built in 1985; there are 2,240 of them. 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.
Call (833) 781-1806 Replacement and new roofs only · homeowners
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.
The rules for a reroof in Mendon
Layers
Two layers means a tear-off
IRC R908.3.1.1 forbids roofing over two existing layers, over slate or tile, or over a water-soaked roof. 36% of Mendon’s homes were built before 1980, so count the layers before comparing quotes.
Source: IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes); 780 CMR 51.00, Chapter 9 amendments
Ice barrier
Required in Mendon, as in every Massachusetts town
The state’s climate table marks the ice barrier “yes” statewide. Membrane or doubled underlayment, eave to 24 inches inside the wall line (IRC R905.1.2), is a line on every quote here.
Source: 780 CMR 51.00, Chapter 3 amendments (Tables R301.2(1) and R301.2(2)); IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes)
Wind and snow
120 mph design wind, 40 psf ground snow
Mendon’s code design values are a 120 mph ultimate design wind speed and a 40 psf ground snow load (35 psf minimum flat-roof snow load). At that wind speed the code calls for asphalt shingles labeled ASTM D7158 Class G or H (Table R905.2.4.1).
Source: 780 CMR 51.00, Chapter 3 amendments (Tables R301.2(1) and R301.2(2)); IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes) (780 CMR 51.00, Table R301.2(2))
Checked against the code text on October 24, 2026. Everything else the state requires: roof replacement in Massachusetts.
Homes and roofs in Mendon
87% of the occupied homes in Mendon are lived in by their owners: 1,840 households, the people this line is for. Counting by decade, 9% before 1940, 22% before 1960, 36% before 1980 of the housing was in place, and 18% dates from 2000 on. (ACS 2020–2024.)
The housing is 92% detached houses, 4% attached single-family houses (rowhouses, twins and townhouses).
Of the 59 Worcester County municipalities on this site, Mendon has the 58th largest share of homes built before 1980: 36%, against a county range of 35% to 79%.
ZIP codes: 01756
Mendon and the towns around it
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Mendon | 1985 | 36% | 87% | 4% | 11 |
| Hopedale | 1959 | 59% | 80% | 26% | 13 |
| Blackstone | 1967 | 62% | 73% | 6% | 9 |
| Bellingham | 1973 | 62% | 79% | 8% | 11 |
| Millville | 1974 | 57% | 87% | 13% | 9 |
| Milford | 1971 | 64% | 65% | 9% | 14 |
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.
Hail and storms near Mendon
Within 10 miles of Mendon, hail of an inch or more was reported on 11 days between 2006 and 2025, the biggest stones 2 in on June 28, 2020.
Worcester County has had 7 federal major-disaster declarations for storms since 2006; the latest was DR-4379, Severe Winter Storm and Snowstorm (July 2018). (OpenFEMA.)
Storm reports are what observers logged, not a measure of damage to any roof. When wind or hail damage means a new roof.
What goes on the roof next
HUD’s useful-life figures are for planning; a warranty is a separate promise. For Mendon’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; 92% of homes here are detached | Class G or H at 120 mph design wind (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; 9% here predate 1940 | Never a base for a new layer (R908.3.1.1); heavy |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | Coating is not a replacement |
Checking a contractor in Massachusetts
Two numbers to ask for in Mendon: the HIC registration (M.G.L. c. 142A, for owner-occupied homes of one to four units) and the construction supervisor license (CSL) with the roof covering specialty.
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in Massachusetts.
Questions about a new roof in Mendon
Does a roof replacement in Mendon need a permit?
Expect a building permit. The residential code’s permit-exempt list (R105.2) has no roofing line. In Mendon the building department takes the application, with the contractor’s home improvement registration on it.
Do the old shingles have to come off in Mendon?
IRC R908.3.1.1 forbids roofing over two existing layers, over slate or tile, or over a water-soaked roof. 36% of Mendon’s homes were built before 1980, so count the layers before comparing quotes.
When were most homes in Mendon built?
By the Census Bureau’s American Community Survey (2020–2024), the median home in Mendon was built in 1985, 36% of homes were built before 1980, 87% are owner-occupied.
Does Mendon get hail that damages roofs?
Hail of 1 inch or larger was reported on 11 days within 10 miles of Mendon from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
What license or registration should a roofer in Mendon have?
Two numbers to ask for in Mendon: the HIC registration (M.G.L. c. 142A, for owner-occupied homes of one to four units) and the construction supervisor license (CSL) with the roof covering specialty.
What they will ask on the phone
- Where the house is: the Mendon address or ZIP
- The number of stories, and whether the house stands alone
- What is on the roof now (asphalt shingles, metal, slate, tile, or a flat membrane) and roughly how old it is
- Whether there is one layer or more, if you know
- That the job is a full replacement or a new roof, and your timing
- Whether the house is in a historic district or an HOA
- That the house is yours and the decision is yours
The full list: before you call.