Groton has 18,155 homes, and half of them were standing by 1974. 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.
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
Without a permit, Connecticut allows only:
Repairs that are limited to 25 percent of roof covering and building siding within one calendar year.
2022 CSBC, (Amd) R105.2, item 11
A whole new roof is more than that, so it goes to Groton’s building official.
Layers
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). 61% of Groton’s homes were built before 1980; many have been reroofed before.
Source: IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes); 2022 Connecticut State Building Code
Ice barrier
The state’s climate table marks the ice barrier “yes” statewide. That is a self-adhering membrane, or two cemented layers of underlayment, from the eave to at least 24 inches inside the wall line (IRC R905.1.2).
Source: 2022 Connecticut State Building Code; IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes)
Deck joints
Connecticut adds a 4-inch self-adhering strip over all joints of a plywood or OSB deck ((Amd) R905.1.1). It is not needed under a fully adhered membrane, or on board decks under 3 feet wide.
Wind and snow
Groton’s code design values are a 128 mph ultimate design wind speed and a 30 psf ground snow load; it is in Connecticut’s hurricane-prone region. At that wind speed the code calls for asphalt shingles labeled ASTM D7158 Class G or H (Table R905.2.4.1).
Source: 2022 Connecticut State Building Code; IRC 2021, Chapter 9 (Pennsylvania edition, UpCodes) (2022 CSBC, Appendix AY)
Rules as read on October 24, 2026. Code edition, permit and contract rules for the whole state: roof replacement in Connecticut.
Of 16,374 occupied homes in Groton, 8,739 (53%) are owner-occupied. By year built, 15% before 1940, 29% before 1960, 61% before 1980; 14% went up in 2000 or later. (ACS 2020–2024.)
By building type: 48% detached houses, 11% attached single-family houses (rowhouses, twins and townhouses), 15% buildings of two to four units.
Of the 21 New London County municipalities on this site, Groton has the 13th largest share of homes built before 1980: 61%, against a county range of 31% to 83%.
ZIP codes: 06340 · 06355
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Groton | 1974 | 61% | 53% | 11% | 6 |
| New London | 1945 | 83% | 36% | 5% | 4 |
| Ledyard | 1972 | 72% | 83% | 5% | 7 |
| Waterford | 1968 | 63% | 80% | 7% | 4 |
| Stonington | 1968 | 62% | 73% | 5% | 6 |
| Montville | 1971 | 61% | 82% | 1% | 7 |
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 6 days since 2006 with hail of at least 1 inch inside a 10-mile circle around Groton, topping out at 1.75 in on September 3, 2013. The most recent was August 15, 2024.
That is fewer than most places in the state on this site (median 9 days).
Remnants of Hurricane Ida (DR-4629, October 2021) is the latest of 10 federal storm declarations covering New London County since 2006. (OpenFEMA.)
A report says hail fell near Groton, not that it damaged a roof. When wind or hail damage means a new roof.
Useful life is HUD’s planning figure, not a warranty. 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; 48% of homes here are detached | Class G or H at 128 mph design wind (IRC Table R905.2.4.1) |
| Metal (standing seam, panels) | 50 years | Roofs that will carry solar later | Standing seam that carries its own loads can skip the tear-off (R908.3.1) |
| Slate | 75 years | Older houses; 15% here predate 1940 | Never a base for a new layer (R908.3.1.1); heavy |
| Flat roof: EPDM or TPO | 15 years | Porches, additions, low-slope rears | Seams at walls and drainage |
Connecticut registers home improvement contractors and their salespeople with the Department of Consumer Protection (C.G.S. § 20-420); 24,065 contractor registrations were active in October 2026. Ask for the number of anyone pricing a roof in Groton.
The price side is in what a new roof costs in Connecticut; the paperwork side in checking a roofing contractor.
The 25 percent line. A whole new roof is more than that, so it goes to Groton’s building official.
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). 61% of Groton’s homes were built before 1980; many have been reroofed before.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Groton was built in 1974, 61% of homes were built before 1980, 53% are owner-occupied.
Hail of 1 inch or larger was reported on 6 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.
Connecticut registers home improvement contractors and their salespeople with the Department of Consumer Protection (C.G.S. § 20-420); 24,065 contractor registrations were active in October 2026. Ask for the number of anyone pricing a roof in Groton.
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.