Half of the 9,839 homes in Guilford were built before 1974. 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
A full replacement in Guilford is past that line; the town building official 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). 60% of Guilford’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. 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
Guilford’s code design values are a 125 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.
Of 8,870 occupied homes in Guilford, 7,420 (84%) are owner-occupied. Counting by decade, 12% before 1940, 27% before 1960, 60% before 1980 of the housing was in place, and 10% dates from 2000 on. (ACS 2020–2024.)
The housing is 84% detached houses, 3% attached single-family houses (rowhouses, twins and townhouses).
Of the 27 New Haven County municipalities on this site, Guilford has the 17th largest share of homes built before 1980: 60%, against a county range of 38% to 87%.
ZIP codes: 06437
| Place | Median built | Before 1980 | Owners | Row, twin | Hail days |
|---|---|---|---|---|---|
| Guilford | 1974 | 60% | 84% | 3% | 3 |
| Madison | 1976 | 57% | 90% | 3% | 4 |
| North Branford | 1977 | 54% | 89% | 6% | 4 |
| Branford | 1972 | 62% | 70% | 12% | 4 |
| Killingworth | 1987 | 41% | 97% | 2% | 5 |
| North Haven | 1964 | 70% | 81% | 4% | 6 |
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 3 separate days within 10 miles of Guilford; the largest was 2 in on July 1, 2012. The most recent was August 26, 2024.
That is fewer than most places in the state on this site (median 9 days).
New Haven County has had 12 federal major-disaster declarations for storms since 2006; the latest was 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 Guilford’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; 84% of homes here are detached | Class G or H at 125 mph design wind (IRC Table R905.2.4.1) |
| Metal (standing seam, panels) | 50 years | Simple roofs with long, unbroken slopes | A complete standing-seam system may go over the old roof (R908.3.1) |
| Slate | 75 years | Older houses; 12% here predate 1940 | Sound slate can be reused (R908.5); broken slate cannot |
| Flat roof: EPDM or TPO | 15 years | Additions and porch roofs | Coating is not a replacement |
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 Guilford.
Contracts, deposits and the right to cancel: checking a roofing contractor. What moves the price: new roof cost in Connecticut.
The 25 percent line. A full replacement in Guilford is past that line; the town building official 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). 60% of Guilford’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 Guilford was built in 1974, 60% of homes were built before 1980, 84% are owner-occupied.
Hail of 1 inch or larger was reported on 3 days within 10 miles of Guilford 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 Guilford.
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.