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Commercial Roofing Contractors in Decatur, Illinois

The county around Decatur has 7 roofing companies with payroll, lower than 83% of the cities we cover. 18 local roofers are listed, 11 license-checked.

  • 24.7%Housing units outside single-family houses
  • 47Days with wind gusts of 58 mph or more
  • 19Days with hail of 1 inch or more
  • 18Roofers listed here
All roofers in Decatur

What commercial roofing is, and what to ask about it

Commercial roofing covers retail, office, warehouse, church and multi-family buildings. Most of these roofs are flat or low-slope and use single-ply membranes, modified bitumen, built-up roofing or standing seam metal.

Crews, materials and warranties differ from house roofing. A company that is good on shingles may not be the right one for a membrane roof.

Signs you need it

  • Ponding water after rain on a flat roof
  • Open seams or failed flashing at rooftop units and parapets
  • Ceiling stains below drains, units or roof edges
  • A roof near the end of its warranty, with a lease or sale coming up

Ask each roofer

  • How many buildings like mine have you roofed in the last two years?
  • Do you scope the whole drainage path or only the wet spot?
  • Can you scan or core the roof to see whether the insulation is wet?
  • Who holds the membrane warranty, you or the manufacturer?

What Decatur changes about commercial roofing

The county has fewer roofing companies with payroll than most cities we cover, so a commercial job may draw few bidders. Ask early who will bid, and whether nearby companies will travel.

Local facts that shape commercial roofing in Decatur
FactDecaturMedian cityRank (1 is highest)
Housing units outside single-family houses24.7%33.2%190 of 213
Days with wind gusts of 58 mph or more4750117 of 212
Days with hail of 1 inch or more1916.594 of 212
Roofing companies with payroll in the county718176 of 210
Sources: NOAA Storm Events (county, 2014 to June 2026), NASA POWER (2014 to 2023), U.S. Census Bureau. How we collect data

When hail is reported in Macon County

March has the most reports, 30 of 64. 97% of reports fall from March to September; the other 2 come in November (1), December (1).

The county's biggest hail days

The largest stone in NOAA's record for Macon County fell on March 31, 2024: 2.5 inches, about the size of a tennis ball.

That day brought 20 reports, with the largest from Decatur.

A commercial roof laid before March 2024 was in place for the largest stone in the record, so ask for a roof survey and keep it with the warranty papers.

The strongest tornado in the record was rated EF2 on December 28, 2025 and stayed on the ground for 22.21 miles.

The strongest thunderstorm gust was 100 mph, on August 19, 2025.

Biggest hail days in Macon County
DateLargest hailReportsWhere
March 31, 20242.5 in, a tennis ball20Decatur
December 1, 20181.75 in, a golf ball1Niantic
March 28, 20201.75 in, a golf ball1Blue Mound
NOAA Storm Events, 2014 to 2026. A county report is not proof of damage at your address.

Why this page prints no city price for commercial roofs

A commercial roof is priced by the building: its area, membrane, insulation, drainage and rooftop equipment. One range per city would mislead.

Ask each company for a written scope and a price per square foot of roof, so bids can be compared line by line.

Estimates for a 2,000 square foot roof, not quotes. How we build them

Roofers to start with in Decatur

6 of 18 listed, license-checked first. They are based in Decatur (3), Forsyth, Mt Zion, Sullivan. We do not tag companies by service, so ask each one about commercial roofing.

See all 18 roofers in Decatur

PickARoofer lists roofing companies serving Decatur, IL. This is a general roofing directory; confirm commercial roofing experience and availability with each company. A license-checked badge describes a separate registry check, not a confirmed service specialty or insurance check. Confirm scope, insurance and availability directly. Requests go to one contractor at a time, with up to three attempts; we cannot promise a response or a start date. Free for homeowners.

Permits and state rules

Do I need a permit for commercial roofing in Illinois?

Permit requirements depend on the property, scope of work and local jurisdiction. Check with the city or county building department and confirm who will obtain any required permit before work starts.

More in Decatur

Commercial Roofing in nearby Illinois cities

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