Half of the 25,613 homes in Greenwich were built before 1963. 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.
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; Greenwich’s building department issues the permit.
Layers
A new roof may go over one existing layer; with two or more, or over slate, clay or cement tile, everything comes off to the deck (IRC R908.3.1.1). 69% of Greenwich’s homes were built before 1980, so count the layers before comparing quotes.
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, which matters in a town where 26% of homes predate 1940.
Wind and snow
Greenwich’s code design values are a 120 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)
Checked against the code text on October 24, 2026. Everything else the state requires: roof replacement in Connecticut.
Owners live in 16,162 of Greenwich’s occupied homes, or 70%. Counting by decade, 26% before 1940, 48% before 1960, 69% before 1980 of the housing was in place, and 16% dates from 2000 on. (ACS 2020–2024.)
The housing is 64% detached houses, 8% attached single-family houses (rowhouses, twins and townhouses), 14% buildings of two to four units.
Of the 23 Fairfield County municipalities on this site, Greenwich has the 8th largest share of homes built before 1980: 69%, against a county range of 53% to 84%.
ZIP codes: 06807 · 06830 · 06831 · 06870 · 06878
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Greenwich | 1963 | 69% | 70% | 8% | 7 |
| Stamford | 1973 | 58% | 49% | 8% | 4 |
| Darien | 1956 | 70% | 82% | 3% | 3 |
| New Canaan | 1967 | 66% | 84% | 11% | 4 |
| Norwalk | 1967 | 69% | 56% | 7% | 4 |
| Wilton | 1970 | 65% | 89% | 5% | 4 |
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.
Since 2006 the National Weather Service has logged hail of 1 inch or larger on 7 separate days within 10 miles of Greenwich; the largest was 3 in on August 1, 2011. The most recent was June 6, 2023.
That is fewer than most places in the state on this site (median 9 days).
At the county level, Greenwich shares Fairfield County’s record of 11 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 Greenwich’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; 64% 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 | Roofs that will carry solar later | A complete standing-seam system may go over the old roof (R908.3.1) |
| Slate | 75 years | Older houses; 26% 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 |
Whoever quotes a roof in Greenwich 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; Greenwich’s building department issues the permit.
A new roof may go over one existing layer; with two or more, or over slate, clay or cement tile, everything comes off to the deck (IRC R908.3.1.1). 69% of Greenwich’s homes were built before 1980, so count the layers before comparing quotes.
By the Census Bureau’s American Community Survey (2020–2024), the median home in Greenwich was built in 1963, 69% of homes were built before 1980, 70% are owner-occupied.
Hail of 1 inch or larger was reported on 7 days within 10 miles of Greenwich 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 Greenwich 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.