What it actually takes to re-roof a house in O'Fallon — whether the city wants a permit, which code edition applies, who to call at the building department, and how old the housing here really is. No sales copy dressed up as local knowledge.
O'Fallon runs to about 15.7 square miles and roughly 32,289 people. It sits about 15 miles east of downtown St. Louis. There are around 13,225 housing units here, and every one of them has a roof with a clock on it. The community dates back to 1874. We cover ZIP codes 62269 and 62225.
We have not logged a completed roof in O'Fallon yet. We would rather say so than put a number on this page that is not real.
The typical home in O'Fallon dates to around the late-1990s. Most of these homes are at or past the first replacement. If yours still has its original roof, it is living on borrowed time.
Housing is spread across many named platted subdivisions (Thornbury Hill, Nolin Creek Estates, Fairwood Hills, Deer Creek, Forest Hills, Fairwood East), reflecting late-20th-century subdivision-driven growth after the city's 1854 founding.
We work across O'Fallon rather than one corner of it — Thornbury Hill, Nolin Creek Estates, Fairwood Hills, Deer Creek, Forest Hills and Fairwood East included. Age and construction change between them, sometimes by thirty years and a whole different framing method, which is why we look before we quote rather than after.
Founded in 1854 and incorporated as a village in January 1874 (city form of government adopted 1905), O'Fallon, IL sits near Scott Air Force Base, which has driven much of its subdivision growth.
Housing from this stretch in O'Fallon sits on plywood or OSB decking and was largely first roofed with three-tab shingles. Most are on their second covering by now. The things worth checking are the penetrations rather than the field: pipe boots from this era are the single most common leak we trace, because the rubber collar splits long before the shingles wear out. Ridge venting was inconsistent through these years, and OSB that has been damp for a season goes soft in a way plywood does not — you find it with your feet, not from the ground.
O'Fallon does not publish a clear answer either way on whether a like-for-like roof covering replacement needs a permit. We confirm it with the department before we start, every time, and we pull whatever is needed as part of the job. We would rather write that here than guess on your behalf.
O'Fallon has not published the edition it currently enforces anywhere we could verify, so this page does not name one. Editions across the metro run from the 2006 IRC to the 2024 IRC, which is a genuinely wide spread — worth asking your contractor which one they are building to.
The published number is 618-624-4500. O'Fallon does not publish the building official's name, so this page does not name one. Plenty of sites will show you one anyway. The department page is here.
Permitting is on us, not on you.
Unlike some states, Missouri does not assign each municipality its own wind and snow numbers — these are metro-wide.
| Criterion | Figure | What it drives |
|---|---|---|
| Ultimate design wind (Vult) | 115 mph | Fastener schedule and the manufacturer wind rating we specify |
| Nominal design wind (Vasd) | 89 mph (derived, not published locally) | The allowable-stress figure older specs quote |
| Ground snow load | 20 psf | Structure, and how much the eaves hold in a freeze-thaw |
| Frost depth | 30 in | Footings, not roof covering |
| Seismic design category | C residential / D commercial | Lateral bracing and structural connections — not shingles |
What each of these actually does to a roof, why New Madrid does not change how shingles go on, and the difference between the code minimum and the manufacturer minimum on nails per shingle, are all in the St. Louis roofing code guide.
Elsewhere in St. Clair County we also cover:
Missouri sets none of this at state level, so a specification that was right one municipality over is not automatically right here.
| City | Permit for a re-roof | Adopted code | Building dept. |
|---|---|---|---|
| Belleville | Not published | Not published | 618-233-6817 |
| Fairview Heights | Not published | Not published | 618-489-2060 |
| Swansea | Yes | 2006 IRC | 618-234-0044 |
Free inspection, a written scope, and photos you keep either way.
O'Fallon does not publish a clear answer either way. We confirm it with the building department before starting and pull whatever is required.
The typical home in O'Fallon dates to around the late-1990s, so most roofs here are on their second or third covering rather than their first. That figure is an ACS-derived median republished by housing-data services, not a survey of individual roofs.
Not yet. We have no completed roof logged in O'Fallon, and we would rather say so than put a number on this page that is not real.
Illinois licenses roofing contractors statewide under 225 ILCS 335, so any roofer working here needs a current IDFPR roofing licence. Missouri, across the river, does not licence roofers at the state level at all.
Permit and code details for O'Fallon come from the jurisdiction's own published pages and codified ordinances. Population, housing and neighbourhood detail come from census data and the sources below; housing-age figures are ACS-derived medians republished by housing-data services, so treat them as approximate. Sources: www.ofallonillinois.org · www.ofallon.org · codelibrary.amlegal.com · codes.iccsafe.org · en.wikipedia.org · www.bestplaces.net. Municipal staffing, phone numbers and adopted code editions change — confirm with the jurisdiction before relying on anything here.