Skip to content 
Ready to talk about the roof over your O’Fallon commercial building? Send us a note or call and we’ll schedule a no-pressure site walk within the week. You’ll leave with a real number, real options, and a straight answer on timing.
Property managers and business owners across O’Fallon rely on Top Quality Exteriors for commercial roofing that keeps operations dry, code-compliant, and fully covered by warranty. Whether you run a warehouse off Highway K, a retail center near WingHaven, or a medical office along Bryan Road, we build and service low-slope systems designed for St. Charles County weather swings. Every job starts with a real site walk, drone-assisted photos, and a written scope of work you can hand straight to ownership or your commercial insurance carrier.
Our commercial crews install and repair TPO membrane, EPDM rubber, modified bitumen, PVC single-ply, and built-up roof systems on retail strips, industrial buildings, offices, and multi-family properties. We also handle coating restorations, drain and scupper work, parapet flashing, and full post-storm supplements after O’Fallon hail events. If you need pitched shingle work over an attached wing or covered entryway, we cross-train with our roof replacement in O’Fallon team so you get one crew on site, one warranty, and one invoice.
O’Fallon commercial buildings almost always run flat or low-slope, and each membrane fails differently. TPO seams open when heat-welds age past 15 years, EPDM shrinks and pulls at parapet corners, modified bitumen granules wash to the drains, and older BUR develops soft spots where ponding water sits for days. We diagnose the actual failure mode before quoting, so you never pay for a full tear-off when a targeted seam repair, coating restoration, or drain rework will get you another decade. Pricing here is straightforward: a typical TPO project in the O’Fallon and St. Charles County market runs $7,000 to $15,000, and we finance qualifying jobs through Hearth and GreenSky. Because St. Charles County sits inside one of the most active hail corridors in the country, with the metro averaging three to five significant hail events per year, our commercial scopes always document soft-metal denting and membrane bruising for your carrier. Need pitched-roof help too? See our storm damage roofing in O’Fallon options.
Every commercial project runs on the same predictable rhythm so property managers know exactly what happens next and when. From the first walk-through to the final punch list, here is how we take an O’Fallon low-slope roof from bid to warranty.
We walk the entire roof and photograph every seam, drain, and flashing detail. Cores are pulled where needed to confirm decking condition. You get a written report with pictures.
We build a line-item scope covering membrane type, mil thickness, fastening pattern, and warranty terms. Financing through Hearth and GreenSky included. Nothing hides in the total.
Crews stage materials, protect landscaping, and shield rooftop equipment. The old system comes down to solid decking with no shortcuts. Wet insulation gets swapped out same day.
Techs install your TPO, EPDM, PVC, or modified bitumen system to spec. Every heat weld and flashing detail is probe-tested before we sign off. Photos of the work go into your file.
We finish with a punch-list walk and hand over warranty paperwork on the spot. Manufacturer coverage is registered in your building’s name. Year-one maintenance reminder is set.
Commercial work punishes contractors who cut corners, and property managers along the I-64 corridor have seen every kind of failed roof job. Top Quality Exteriors is a licensed Missouri and Illinois contractor, BBB Accredited with an A+ rating, and an Owens Corning Preferred Contractor for the pitched portions that tie into your flat system. Our 52-plus person team runs full general liability and workers’ comp coverage on every project we touch.
We back every commercial install with a firm 36-month workmanship warranty and, on qualifying membranes, extended manufacturer coverage up to lifetime terms. When a March hailstorm hits O’Fallon the way the 2024 event did, our 24/7 emergency line goes straight to a real dispatcher, not voicemail. You get same-day tarping, a documented Xactimate-friendly scope inside 48 hours, and one project manager who stays on from the adjuster meeting to final invoice.
Commercial roofing pricing depends on membrane type, square footage, insulation R-value, edge detail, and how much wet insulation the tear-off reveals. In the O’Fallon and St. Charles County market, a typical TPO reroof falls between $7,000 and $15,000 for a small commercial unit, with larger warehouses off Highway K and industrial pads near Bryan Road scaling up from there. EPDM tends to run about 10 to 20 percent below TPO on the same building footprint.
Coating restorations on a still-sound modified bitumen or metal deck can extend life another 10 to 15 years at roughly half tear-off cost, which is often the right call when the budget hasn’t caught up with the roof calendar. See our TPO and flat roofing in O’Fallon page for full membrane options. We offer Hearth and GreenSky financing so you can spread the number across quarters, and every quote is line-itemed with no fee for the site walk.
Every credential we carry is a commitment to quality, safety, and your peace of mind — on every project, in every state we serve.
