Permit
Expect a building permit
Roofing is not on the Massachusetts list of work exempt from a permit (780 CMR 51.00, R105.2). Amherst’s building department issues it, and the application carries the contractor’s HIC registration number.
Roof Replacement in Amherst, MA
The median home in Amherst was built in 1975; there are 10,925 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.
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 Amherst
Layers
No third layer
IRC R908.3.1.1 forbids roofing over two existing layers, over slate or tile, or over a water-soaked roof. With 61% of Amherst’s homes were built before 1980, ask what is under the newest layer.
Source: IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes); 780 CMR 51.00, Chapter 9 amendments
Ice barrier
Required in Amherst, as in every Massachusetts town
There is no local exception: the state table says “yes.” 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
114 mph design wind, 40 psf ground snow
Amherst’s code design values are a 114 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 D, 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))
Rules as read on October 24, 2026. Everything else the state requires: roof replacement in Massachusetts.
Homes and roofs in Amherst
Owners live in 4,288 of Amherst’s occupied homes, or 44%. By year built, 23% before 1940, 29% before 1960, 61% before 1980; 16% went up in 2000 or later. (ACS 2020–2024.)
By building type: 42% detached houses, 7% attached single-family houses (rowhouses, twins and townhouses), 14% buildings of two to four units.
Of the 16 Hampshire County municipalities on this site, Amherst has the 13th largest share of homes built before 1980: 61%, against a county range of 42% to 73%.
ZIP codes: 01002 · 01003
Amherst and the towns around it
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Amherst | 1975 | 61% | 44% | 7% | 16 |
| Hadley | 1971 | 63% | 73% | 2% | 15 |
| Pelham | 1958 | 73% | 79% | 5% | 15 |
| Hatfield | 1967 | 66% | 75% | 7% | 13 |
| Leverett | 1973 | 60% | 87% | 3% | 9 |
| Sunderland | 1979 | 53% | 42% | 5% | 11 |
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.
Storm record around Amherst
Since 2006 the National Weather Service has logged hail of 1 inch or larger on 16 separate days within 10 miles of Amherst; the largest was 1.75 in on July 14, 2021. The most recent was June 6, 2025.
That is more hail days than 90% of the places in the state on this site.
Severe Winter Storm, Snowstorm, and Flooding (DR-4110, April 2013) is the latest of 6 federal storm declarations covering Hampshire County since 2006. (OpenFEMA.)
A report says hail fell near Amherst, not that it damaged a 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 Amherst’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; 42% of homes here are detached | Class D, G or H at 114 mph design wind (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; 23% 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 | Coating is not a replacement |
Checking a contractor in Massachusetts
In Amherst the contractor’s HIC registration (M.G.L. c. 142A) and the CSL of the supervisor licensed for roof covering are the two numbers to look up before signing.
The price side is in what a new roof costs in Massachusetts; the paperwork side in checking a roofing contractor.
Questions about a new roof in Amherst
Does a roof replacement in Amherst need a permit?
Expect a building permit. Roofing is not on the Massachusetts list of work exempt from a permit (780 CMR 51.00, R105.2). Amherst’s building department issues it, and the application carries the contractor’s HIC registration number.
Can a new roof go over the old one in Amherst?
IRC R908.3.1.1 forbids roofing over two existing layers, over slate or tile, or over a water-soaked roof. With 61% of Amherst’s homes were built before 1980, ask what is under the newest layer.
How old are the houses in Amherst?
By the Census Bureau’s American Community Survey (2020–2024), the median home in Amherst was built in 1975, 61% of homes were built before 1980, 44% are owner-occupied.
How many hail days has Amherst had?
Hail of 1 inch or larger was reported on 16 days within 10 miles of Amherst from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
How do I check a roofing contractor in Amherst?
In Amherst the contractor’s HIC registration (M.G.L. c. 142A) and the CSL of the supervisor licensed for roof covering are the two numbers to look up before signing.
What they will ask on the phone
- Where the house is: the Amherst address or ZIP
- One story or two (or more), detached or attached
- What is on the roof now (asphalt shingles, metal, slate, tile, or a flat membrane) and roughly how old it is
- How many layers are on it, if you know
- That the job is a full replacement or a new roof, and your timing
- Any historic-district or HOA rules on the house in Amherst
- That the house is yours and the decision is yours
The full list: before you call.