Roof replacement, leak repair and hail & storm damage for homes in Florissant. In Florissant, the 2021 IRC is in force and 2% of the 23,064 homes went up before 1940. It starts with a free inspection that photographs every slope.
Florissant runs to about 12.86 square miles and roughly 52,533 people. It sits about 14 miles north of downtown St. Louis. The community dates back to 1785. We cover ZIP codes 63031, 63032, 63033 and 63034.
No completed roof in Florissant is logged in our job records yet.
Around 18,000 houses were built in Florissant between 1947 and 1980, as the city's population surged toward a mid-1970s peak near 76,000. That makes its housing overwhelmingly postwar and mid-century, aside from the older Old Town core.
That includes Old Town. Housing age and construction shift across Florissant, sometimes by decades within a few streets, which is why we look at the roof before we quote rather than after.
Florissant has a city Landmarks and Historic Districts Commission and a large historic core (Old Town and St. Ferdinand) with properties dating to the 1790s, surrounded by a huge ring of 1947-1980 postwar housing.
The postwar housing in Florissant is mostly simple to roof, which is why it gets done badly so often. Decking is usually 1x6 boards or early plywood, still sound but worth walking rather than assuming. The recurring problems are the low-slope sections — porch roofs, carport tie-ins, the flat bit over an addition — where a shingle was installed below its rated pitch and has been failing quietly ever since. Attic ventilation on houses of this era is also routinely short of what current shingle warranties require, and under-venting cooks a roof from underneath. We measure intake against exhaust before we quote rather than just nailing on a ridge vent and calling it solved.
The Census Bureau counts 23,064 homes in Florissant, with a median year built of 1963. 403 of them (2%) went up before 1940 — 33rd of 48 places on this site for pre-1940 share — and 588 (3%) in 2000 or later. The 1960s were the busiest decade, adding 8,874 of today's homes (38%). Across St. Louis County the pre-1940 share is 10%, so Florissant sits below it.
The rule of thumb from Missouri's Department of Commerce and Insurance is a useful life of usually about 25 years for a roof. On that yardstick the 22,476 homes in Florissant built before 2000 (97%) have outlived at least one roof, and the 17,628 built before 1970 (76%) are usually on a third covering or later. Homes from the 2000s (468 in Florissant) are reaching their first replacement, while the 120 built since 2010 are mostly still on the roof they were built with. On houses that old, the question worth asking is how many layers are up there: a roof laid over an old one hides the deck.
By building type: 18,162 detached houses (79%), 495 attached (2%). 2,583 homes (11%) sit in two- to nine-unit buildings and 1,728 (7%) in buildings of ten units or more, where a resident rarely gets to choose the roofer. Owners live in 67% of the 21,229 occupied homes. With houses like these, the jobs we expect most are full tear-offs on houses past two roof lives.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 403 | 2% | |
| 1940s | 908 | 4% | |
| 1950s | 7,443 | 32% | |
| 1960s | 8,874 | 38% | |
| 1970s | 3,024 | 13% | |
| 1980s | 1,411 | 6% | |
| 1990s | 413 | 2% | |
| 2000s | 468 | 2% | |
| 2010s | 99 | 0% | |
| 2020 or later | 21 | 0% |
Census ACS 2020–2024, tables B25034, B25035, B25024 and B25003: 23,064 homes, 21,229 occupied. Survey estimates.
From 2016 through 2025, NOAA’s Storm Prediction Center recorded 15 reports of hail of 1 inch or more within 5 miles of Florissant’s center, spread over 8 storm days. 4 of them were 1.75 inches or larger. The largest, 2 inches, came on May 19, 2025, about 0.7 miles north of the center. These are reports, not a full record: they come from spotters and the public, so busier areas log more.
| Latest reports | Size | From center |
|---|---|---|
| May 19, 2025 | 2 inches | 0.7 mi N |
| May 19, 2025 | 1 inch | 0.4 mi E |
| May 19, 2025 | 1.5 inches | 3.4 mi S |
| May 19, 2025 | 1.25 inches | 2.4 mi W |
| May 19, 2025 | 1.25 inches | 2.4 mi W |
Hail damage rarely shows from the ground; a storm inspection photographs each slope so you know either way.
Florissant publishes no rule either way on a like-for-like re-roof, so we ask the building department (314-839-7648) before we start and pull whatever it wants.
Florissant enforces the 2021 IRC. City Code Section 500.060 adopts the 2021 International Residential Code, including Appendices AA, AB, AC, AD, AE, AG, AH, AJ and AK.
The published number is 314-839-7648. The building official on record is Debra Irvin, Building Commissioner. The department page is here.
Wind 115 mph (ultimate) and ground snow 20 psf, the same across the metro; see the roofing code guide for what they govern.
Florissant borders Hazelwood, Ferguson, Black Jack and Old Jamestown.
Also in St. Louis County:
| City | Re-roof permit | Code | Median built |
|---|---|---|---|
| Florissant | Not published | 2021 IRC | 1963 |
| Affton | Conditional | 2015 IRC | 1958 |
| Ballwin | Yes | 2015 I-Codes (2024 I-Codes proposed for 2026) | 1976 |
| Brentwood | Not published | 2024 IRC | 1956 |
| Chesterfield | Not published | 2015 IBC / 2015 IRC | 1982 |
| Clayton | Not published | 2021 IRC | 1954 |
| Creve Coeur | Not published | 2009 IRC | 1980 |
All 21 St. Louis County cities side by side →
Florissant does not publish a clear answer either way. We confirm it with the building department before starting and pull whatever is required.
Florissant enforces the 2021 IRC. City Code Section 500.060 adopts the 2021 International Residential Code, including Appendices AA, AB, AC, AD, AE, AG, AH, AJ and AK.
Older than most people guess: the Census puts 97% of Florissant's homes before 2000 and 76% before 1970, with a median year built of 1963 (2020–2024 estimates). A roof usually lasts about 25 years, so the deck and the layers get checked before any quote.
The last report near Florissant of hail 1 inch or bigger came on May 19, 2025; NOAA's records hold 15 of them within 5 miles since 2016.
The building official on record is Debra Irvin, Building Commissioner. The department's own number is on this page, beside its name.
It can. Florissant has Florissant Old Town Historic District (locally designated, 1969), St. Ferdinand Central Historic District (National Register) and City of St. Ferdinand Multiple Resource Area (156 blocks, properties dating 1790-1940). Inside a designated district, changing a visible roof material or color can need preservation review before the permit is issued. Like-for-like replacement usually raises fewer questions, but we check before quoting.
Not yet: no completed roof in Florissant is in our job records, so this page shows no job count.
Researched 2026-09-09; housing, Census ACS 2020–2024; hail, NOAA SPC. Sources: www.florissantmo.com · ecode360.com · www.florissantmo.com · en.wikipedia.org · www.florissantmo.com · www.bestplaces.net · data.census.gov · www.spc.noaa.gov. Rules and staff change; check with the jurisdiction.
