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Commercial Roofing Contractors in Janesville, Wisconsin

Hail of 1 inch or more fell on 25 days near Janesville between 2014 and June 2026, higher than 65% of the cities we cover. 22 local roofers are listed.

  • 26.3%Housing units outside single-family houses
  • 51Days with wind gusts of 58 mph or more
  • 25Days with hail of 1 inch or more
  • 22Roofers listed here
All roofers in Janesville

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 Janesville changes about commercial roofing

Hail of 1 inch or more has fallen near Janesville on more days than in most cities we cover. Membranes can be punctured by hail, so ask for an inspection after a hail day, with core samples if the insulation may be wet.

Local facts that shape commercial roofing in Janesville
FactJanesvilleMedian cityRank (1 is highest)
Housing units outside single-family houses26.3%33.2%177 of 213
Days with wind gusts of 58 mph or more515098 of 212
Days with hail of 1 inch or more2516.570 of 212
Roofing companies with payroll in the county211884 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 Rock County

April has the most reports, 23 of 74. 97% of reports fall from March to September; the other 2 come in February (1), October (1).

The county's biggest hail days

The largest stone in NOAA's record for Rock County fell on April 18, 2025: 2.75 inches, about the size of a baseball.

That day brought 11 reports, with the largest from Evansville.

A commercial roof laid before April 2025 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 February 8, 2024 and stayed on the ground for 13.71 miles.

The strongest thunderstorm gust was 85 mph, on June 10, 2026.

Biggest hail days in Rock County
DateLargest hailReportsWhere
April 18, 20252.75 in, a baseball11Evansville
July 23, 20222 in, a hen egg5Mallwood
April 17, 20262 in, a hen egg4Beloit
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 Janesville

6 of 22 listed. They are based in Janesville (4), Beloit, Brodhead. We do not tag companies by service, so ask each one about commercial roofing.

See all 22 roofers in Janesville

PickARoofer lists roofing companies serving Janesville, WI. 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 Wisconsin?

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 Janesville

Commercial Roofing in nearby Wisconsin cities

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