Key numbers
67 verified hail storms with stones of 1.75 inches or larger reached Arapahoe County, which includes Centennial, from 1984 to 2026 in the storm records we keep; the largest measured 4.5 inches (softball size) on July 13, 2011 (NOAA NCEI).
| Hail storms by decade, 1984 to 2026 | 1980s: 1, 1990s: 3, 2000s: 21, 2010s: 31, 2020s: 11 Source: Storm library: Denver metro hail history |
|---|---|
| Largest hail | 4.5 in. (softball), July 13, 2011 Source: NOAA NCEI |
| Costliest hail storm | $2.3 billion insured losses (2017 dollars), May 8, 2017 Source: RMIIA |
| $4,699 | The average U.S. residential roof repair cost was $4,699 in 2025, up 25% from the prior four-year average. Source: Insurance Journal (reporting Verisk), 2025 |
| 80.6% | 80.6% of occupied housing units in Centennial were owner-occupied in 2020-2024. Source: U.S. Census Bureau, American Community Survey 5-Year Estimates, 2020-2024 |
| About 3.5 million | About 3.5 million U.S. households reported missing roofing material, 1.9 million a sagging roof and 1.5 million a hole in the roof in the 2023 American Housing Survey. Source: Roofing Contractor (reporting Instant Roofer analysis of 2023 AHS), 2023 |
A storm counts when the library lists Arapahoe County among the areas it hit. Each hail size is the storm's largest report, which may have fallen in a neighboring county, and insured losses cover every area the storm hit.
Hail history by ZIP (NOAA reports since 1996; linked ZIPs have a full page, method)
| ZIP | Area | 1 in.+ reports | Largest |
|---|---|---|---|
| 80015 | Centennial | 34 | 2.5 in. |
| 80112 | Centennial | 11 | 2 in. |
| 80122 | Centennial | 4 | 1.25 in. |
| 80121 | Centennial | 2 | 1 in. |
Local building code: Centennial roof code data: IRC edition, reroof permits, ice barrier
Roofers working in Centennial are required to get a permit for any re-roof and for repairs over 100 square feet, must strip every existing layer down to the deck on a replacement, and must install an ice barrier underlayment on every roof and drip edge on every edge. Repairs that grow past 25% of the roof area require a complete tear-off. Integrity’s Denver-area office is in Centennial, at 13275 E. Fremont Pl, Suite 340.
Centennial’s re-roof rules
| Topic | Centennial requirement |
|---|---|
| Code | 2021 International Residential Code, Section R908 for repairs and replacement |
| Small repair | Under 100 sq ft: no permit |
| Major repair | Over 100 sq ft on a roof or across slopes: permit required |
| Tear-off trigger | Repairs over 25% of the total roof area require a complete tear-off and re-roof |
| Replacement | All existing layers removed to the deck |
| Ice barrier | Required on all roofs |
| Drip edge | Required on all edges of the roof |
| Materials | No used materials, and nothing salvaged from another roof |
| Inspections | Mid-roof on every re-roof permit, plus a final. Photo inspections allowed under a waiver; in person, the city does not supply or set ladders |
| Permit card | Printed and posted before work begins |
If your neighborhood has an HOA, its architectural review approval is separate from the city permit. Bring the HOA’s color and material rules to the inspection and we will price options that fit them.
Why the rules matter after a hailstorm
Centennial’s ice barrier rule is stricter than Denver’s, which does not require one at the eaves, so a Centennial replacement scope should include it. If you are filing a claim, the claim stays yours; our photos make sure nothing in the code-required scope gets missed. Read Denver storm damage repair for the storm process and roof repair for smaller damage.
Next door, the rules shift again: Littleton calls anything over 100 square feet a full replacement on shingle roofs, and Aurora requires its own contractor license. Heading south, see Castle Rock.
Centennial roofing services
Roof replacement, repairs, asphalt shingles, metal, synthetic cedar and commercial roofing. Our Denver roof replacement cost guide covers pricing, and you can see every Denver-area town we serve.
Visit or call our Centennial office
We are veteran-owned, family-run since 1990, an Owens Corning Platinum Preferred contractor, with 650+ Google reviews. The office is open Monday to Friday, 8 AM to 5 PM, and we reply the same business day. Call (303) 209-0152 or book a free roof inspection.
Source: City of Centennial Building Division, Residential Roof Repairs and Re-Roofing.
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