Harwinton has 2,273 homes, and half of them were standing by 1961. Below: what the code asks of a replacement here, the permit, and the town’s own records.
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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
Replacing the whole roof crosses that line; Harwinton’s building department issues the permit.
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). 72% of Harwinton’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
Connecticut 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: 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
Harwinton’s code design values are a 120 mph ultimate design wind speed and a 35 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)
Checked against the code text on October 24, 2026. The state’s code edition and the rest of its rules: roof replacement in Connecticut.
Of 2,146 occupied homes in Harwinton, 1,995 (93%) are owner-occupied. Counting by decade, 13% before 1940, 49% before 1960, 72% before 1980 of the housing was in place, and 10% dates from 2000 on. (ACS 2020–2024.)
The housing is 96% detached houses.
Of the 26 Litchfield County municipalities on this site, Harwinton has the 5th largest share of homes built before 1980: 72%, against a county range of 35% to 79%.
ZIP codes: 06791
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Harwinton | 1961 | 72% | 93% | 1% | 16 |
| Burlington | 1981 | 48% | 95% | 4% | 13 |
| Torrington | 1960 | 74% | 66% | 4% | 17 |
| New Hartford | 1975 | 56% | 89% | 5% | 14 |
| Plymouth | 1965 | 64% | 77% | 3% | 12 |
| Thomaston | 1961 | 69% | 78% | 4% | 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.
NOAA’s storm reports show 16 days since 2006 with hail of at least 1 inch inside a 10-mile circle around Harwinton, topping out at 2 in on June 26, 2009. The most recent was September 6, 2025.
That is more hail days than 97% of the places in the state on this site.
At the county level, Harwinton shares Litchfield County’s record of 9 storm disaster declarations since 2006, the newest DR-4820 (Severe Storm, Flooding, Landslides, and Mudslides, September 2024). (OpenFEMA.)
Storm reports are what observers logged, not a measure of damage to any roof. When wind or hail damage means a new roof.
HUD’s useful-life figures are for planning; a warranty is a separate promise. For Harwinton’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; 96% 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; 13% here predate 1940 | Can’t be roofed over; check the framing for the weight |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | Where the roof meets a wall or parapet |
Whoever quotes a roof in Harwinton should give you a Connecticut home improvement registration number (C.G.S. § 20-420); the state’s data portal listed 24,065 active ones in October 2026. Registration is not an endorsement of workmanship (§ 20-427(b)(6)).
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in Connecticut.
Needed beyond a quarter of the roof. Replacing the whole roof crosses that line; Harwinton’s building department issues the permit.
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). 72% of Harwinton’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 Harwinton was built in 1961, 72% of homes were built before 1980, 93% are owner-occupied.
Hail of 1 inch or larger was reported on 16 days within 10 miles of Harwinton from 2006 through 2025 (NOAA Storm Prediction Center). A report means hail fell nearby, not that a roof was damaged.
Whoever quotes a roof in Harwinton should give you a Connecticut home improvement registration number (C.G.S. § 20-420); the state’s data portal listed 24,065 active ones in October 2026. Registration is not an endorsement of workmanship (§ 20-427(b)(6)).
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.