Roof replacement, leak repair and hail & storm damage for homes in Mehlville. In Mehlville, the 2015 IRC is in force and 1% of the 13,994 homes went up before 1940. It starts with a free inspection that photographs every slope.
Mehlville runs to about 7.63 square miles and roughly 28,955 people. It sits about 12 miles south of downtown St. Louis. We cover ZIP codes 63125, 63128 and 63129.
No completed roof in Mehlville is logged in our job records yet.
Census data describes Mehlville as a fully urbanized, inner-ring St. Louis County suburb.
Mehlville is an unincorporated community and has never been a city. Census data counts it as 100% urban, and it covers areas also associated with the Lemay, Tesson Ferry and Oakville townships.
Postwar houses in Mehlville are plain to roof, which is exactly why so many get roofed carelessly. Expect 1x6 board decking or early plywood: usually sound, but it should be walked, not assumed. The weak spots are the shallow pitches — a porch roof, the join to a carport, the flat section over an addition — where shingles went on below their rated slope and have leaked slowly for years. Attics from this era rarely have the ventilation today's shingle warranties ask for, and a hot, under-vented attic ages a roof from below, so intake and exhaust get measured before the quote.
The Census Bureau counts 13,994 homes in Mehlville, with a median year built of 1969. 186 of them (1%) went up before 1940 — 40th of 48 places on this site for pre-1940 share — and 1,143 (8%) in 2000 or later. The 1960s were the busiest decade, adding 4,236 of today's homes (30%). That is below St. Louis County's 10%.
The rule of thumb from Missouri's Department of Commerce and Insurance is a useful life of usually about 25 years for a roof. By that measure, 92% of Mehlville's homes — the 12,851 built before 2000 — are past their first roof, and the 7,330 built before 1970 (52%) are usually on a third covering or later. Homes from the 2000s (552 in Mehlville) are reaching their first replacement, while the 591 built since 2010 are mostly still on the roof they were built with. Older houses are where a second layer laid over the first turns up, and that layer is what hides soft decking.
Detached single-family houses make up 59% (8,212); attached houses and townhouses 5% (689). 2,407 homes (17%) sit in two- to nine-unit buildings and 2,665 (19%) in buildings of ten units or more, whose roofs are normally an owner's or a board's call rather than a resident's. Owners live in 66% of the 13,507 occupied homes. With houses like these, the jobs we expect most are full tear-offs on houses past two roof lives and flat and low-slope sections, which turn up more on attached and multi-unit buildings.
| Built | Homes | Share | |
|---|---|---|---|
| Before 1940 | 186 | 1% | |
| 1940s | 630 | 5% | |
| 1950s | 2,278 | 16% | |
| 1960s | 4,236 | 30% | |
| 1970s | 2,569 | 18% | |
| 1980s | 1,786 | 13% | |
| 1990s | 1,166 | 8% | |
| 2000s | 552 | 4% | |
| 2010s | 580 | 4% | |
| 2020 or later | 11 | 0% |
Census ACS 2020–2024, tables B25034, B25035, B25024 and B25003: 13,994 homes, 13,507 occupied. Survey estimates.
Between 2016 and 2025 there were 37 reports of 1-inch-plus hail within 5 miles of Mehlville’s center in the records of NOAA’s Storm Prediction Center, on 13 separate days. 8 of them were 1.75 inches or larger. The largest, 2 inches, came on March 14, 2025, about 4.3 miles south of the center. The most recent was 1 inch on April 2, 2025. These are reports, not a full record: they come from spotters and the public, so busier areas log more.
| Latest reports | Size | From center |
|---|---|---|
| April 2, 2025 | 1 inch | 2.4 mi S |
| March 14, 2025 | 1 inch | 3.7 mi S |
| March 14, 2025 | 1 inch | 3.6 mi S |
| March 14, 2025 | 1 inch | 1.6 mi SE |
| March 14, 2025 | 1 inch | 1.6 mi SE |
A bruised shingle can look fine for a season or two, which is why a storm inspection after a date like these is worth having.
Mehlville is unincorporated, so St. Louis County Public Works sets the rule. Its re-roofing checklist says no building permit is needed for a like-for-like replacement of asphalt shingles on a roof sloped 4:12 or steeper, unless the job changes something: a permit is required when the slope is under 4:12, when more than 25% of the roof sheathing must be replaced, when the new covering is a different material, or when old board sheathing has to be replaced with structural panels. Work that needs no permit still has to meet the county's re-roofing code.
Mehlville enforces the 2015 IRC. Mehlville follows St. Louis County's code: the 2015 International Residential Code, adopted by Ordinance 27,654, per the county's re-roofing checklist.
The published number is 314-615-5184. Mehlville 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.
The design figures are metro-wide rather than local: 115 mph ultimate design wind and a 20 psf ground snow load. What they do to a roof is in the roofing code guide.
Also in St. Louis County:
| City | Re-roof permit | Code | Median built |
|---|---|---|---|
| Mehlville | Conditional | 2015 IRC | 1969 |
| 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 →
Mehlville is unincorporated, so St. Louis County Public Works sets the rule. Its re-roofing checklist says no building permit is needed for a like-for-like replacement of asphalt shingles on a roof sloped 4:12 or steeper, unless the job changes something: a permit is required when the slope is under 4:12, when more than 25% of the roof sheathing must be replaced, when the new covering is a different material, or when old board sheathing has to be replaced with structural panels. Work that needs no permit still has to meet the county's re-roofing code.
Mehlville enforces the 2015 IRC. Mehlville follows St. Louis County's code: the 2015 International Residential Code, adopted by Ordinance 27,654, per the county's re-roofing checklist.
Older than most people guess: the Census puts 92% of Mehlville's homes before 2000 and 52% before 1970, with a median year built of 1969 (2020–2024 estimates). A roof usually lasts about 25 years, so the deck and the layers get checked before any quote.
37 reports of 1-inch-plus hail fell within 5 miles of Mehlville between 2016 and 2025, the biggest 2 inches on March 14, 2025 (NOAA Storm Prediction Center).
Not yet: no completed roof in Mehlville 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: manchestermo.gov · stlouiscountymo.gov · mehlvillefire.com · stlouiscountymo.gov · en.wikipedia.org · www.bestplaces.net · data.census.gov · www.spc.noaa.gov. Rules and staff change; check with the jurisdiction.
