Permit
Expect a building permit
Massachusetts exempts sheds, fences and finish work from permits (R105.2), not roofing. In Groton the building department takes the application, with the contractor’s home improvement registration on it.
Roof Replacement in Groton, MA
Groton has 3,818 homes, and half of them were standing by 1988. Below: what the code asks of a replacement here, the permit, and the town’s own records.
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 Groton
Layers
One old layer can stay; two cannot
On a roof that already carries two layers, or slate or tile, the code allows no recover: it is a tear-off (IRC R908.3.1.1). 36% of Groton’s homes were built before 1980; many have been reroofed before.
Source: IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes); 780 CMR 51.00, Chapter 9 amendments
Ice barrier
Required in Groton
Massachusetts answers “yes” to the ice barrier for every town. It runs from the eave to 24 inches inside the exterior wall, more on steep roofs (IRC R905.1.2); check that the quote lists it.
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
116 mph design wind, 60 psf ground snow
Groton’s code design values are a 116 mph ultimate design wind speed and a 60 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))
Checked against the code text on October 24, 2026. Code edition, permit and contract rules for the whole state: roof replacement in Massachusetts.
Homes and roofs in Groton
Owners live in 3,289 of Groton’s occupied homes, or 89%. Counting by decade, 17% before 1940, 25% before 1960, 36% before 1980 of the housing was in place, and 19% dates from 2000 on. (ACS 2020–2024.)
The housing is 80% detached houses, 6% attached single-family houses (rowhouses, twins and townhouses), 7% buildings of two to four units.
Of the 54 Middlesex County municipalities on this site, Groton has the 52nd largest share of homes built before 1980: 36%, against a county range of 29% to 87%.
ZIP codes: 01450
Groton and the towns around it
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Groton | 1988 | 36% | 89% | 6% | 13 |
| Ayer | 1977 | 54% | 69% | 10% | 8 |
| Pepperell | 1981 | 47% | 84% | 5% | 16 |
| Shirley | 1984 | 44% | 77% | 11% | 9 |
| Dunstable | 1987 | 37% | 97% | 1% | 19 |
| Littleton | 1977 | 52% | 84% | 3% | 8 |
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 Groton
Since 2006 the National Weather Service has logged hail of 1 inch or larger on 13 separate days within 10 miles of Groton; the largest was 2 in on August 4, 2015. The most recent was July 11, 2025.
At the county level, Groton shares Middlesex County’s record of 8 storm disaster declarations since 2006, the newest 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
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; 80% of homes here are detached | Class D, G or H at 116 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; 17% 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 | Seams at walls and drainage |
Checking a contractor in Massachusetts
For an owner-occupied home of one to four units in Groton, the contractor must be registered under the home improvement law (M.G.L. c. 142A), and a construction supervisor licensed (CSL) for roof covering supervises a permitted reroof. Ask for both numbers.
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 Groton
Is a permit required for a new roof in Groton, MA?
Expect a building permit. Massachusetts exempts sheds, fences and finish work from permits (R105.2), not roofing. In Groton the building department takes the application, with the contractor’s home improvement registration on it.
Do the old shingles have to come off in Groton?
On a roof that already carries two layers, or slate or tile, the code allows no recover: it is a tear-off (IRC R908.3.1.1). 36% of Groton’s homes were built before 1980; many have been reroofed before.
When were most homes in Groton built?
By the Census Bureau’s American Community Survey (2020–2024), the median home in Groton was built in 1988, 36% of homes were built before 1980, 89% are owner-occupied.
Does Groton get hail that damages roofs?
Hail of 1 inch or larger was reported on 13 days within 10 miles of Groton 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 Groton have?
For an owner-occupied home of one to four units in Groton, the contractor must be registered under the home improvement law (M.G.L. c. 142A), and a construction supervisor licensed (CSL) for roof covering supervises a permitted reroof. Ask for both numbers.
What they will ask on the phone
- Your address or ZIP code in Groton
- How many stories the house has, and whether it is detached or attached
- What covers the roof now and about when it went on
- 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 you own the home and decide on the roof
The full list: before you call.