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 30.51 square miles and roughly 94,074 people. It sits about 31 miles northwest of downtown St. Louis. There are around 34,426 housing units here, and every one of them has a roof with a clock on it. The community dates back to 1912. We cover ZIP codes 63366 and 63368.
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 mid-2000s. Most of these homes are at or past the first replacement. If yours still has its original roof, it is living on borrowed time.
First settled in 1856 and incorporated in 1912, O'Fallon's housing is dominated by rapid recent growth; the 1907-era St. Mary's Institute building (National Register, 2007) is a rare pre-20th-century holdover amid the newer subdivisions.
Newer construction in O'Fallon generally has OSB decking, architectural shingles and a proper ridge vent, so the roofs themselves start in better shape. The catch is what the shingle was: a great deal of the building through the 2000s went on with builder-grade shingles carrying a nominal warranty far longer than their real service life, and those are reaching the end now. Hail is the other factor — a newer roof is not a hail-proof roof, and a bruised mat can look perfect from the driveway for two years and then start failing all at once. If yours has never been looked at after a storm, that is the reason to have it looked at.
A permit is required for re-roofing. The city publishes a dedicated 'Residential Re-roofing Requirements' guidance document.
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 636-379-5660. The building official on record is Nathan Lacey, Building Official (636-379-5597, nlacey@ofallonmo.gov). 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.
O'Fallon borders Lake St. Louis and St. Peters. These are the ones we also cover, each with its own permit rule and code edition:
Elsewhere in St. Charles 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. |
|---|---|---|---|
| Cottleville | Not published | 2021 IRC | 636-498-6565 |
| Lake St. Louis | Not published | 2021 Construction Codes | 636-625-7984 |
| St. Charles | No | 2021 IRC | 636-949-3222 |
| St. Peters | Not published | 2021 IRC | 636-278-2244 |
| Wentzville | Not published | 2015 I-Codes | 636-327-5101 |
Free inspection, a written scope, and photos you keep either way.
A permit is required for re-roofing. The city publishes a dedicated 'Residential Re-roofing Requirements' guidance document.
The typical home in O'Fallon dates to around the mid-2000s, 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.
Missouri has no state-level roofing contractor licence. Licensing and registration are imposed municipally, and several St. Louis metro cities require it. Illinois does licence roofers statewide, so a contractor working the Metro East needs an IDFPR roofing licence.
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.ofallon.mo.us · www.ofallonmo.gov · codes.iccsafe.org · ecode360.com · en.wikipedia.org · www.bestplaces.net. Municipal staffing, phone numbers and adopted code editions change — confirm with the jurisdiction before relying on anything here.