Janesville, WI · Roof Repair

Roof Repair Contractors in Janesville, Wisconsin

Leak or damaged shingles? Request a quote and confirm availability with the roofer. 22 local roofers listed.

Short answer: Small roof repairs (a few shingles, flashing, a patch) usually cost $300–$1,000, and larger sections $1,500–$4,500; if the roof is over 20 years old or repairs pass half the price of a new roof, replacing costs less in the long run. These are national ranges, not Janesville quotes. In Janesville: 1972 median year homes were built. Ask any roofer for a license number and a certificate of insurance.

Get a free quote See Janesville in numbers
  • 1972median year homes were built
  • 63.2%of homes built before 1980
  • 95freeze-thaw days a year
  • 25hail days (1 inch+), 2014–2026

How much life is left in my Janesville roof?

Typical lifespans are published ranges for each material; for a Janesville house, real life also depends on installation, attic ventilation and the weather Janesville gets.

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Most roof repair calls in Janesville trace to freeze-thaw: sealant around chimneys and vents cracks over winter, lifted shingles let meltwater behind, and ice dams push water under the eave course before anyone notices inside. Minor repairs in Janesville run a few hundred dollars for localized damage; larger scopes covering multiple damaged sections or re-decking work cost more and may warrant comparing repair cost against a full replacement estimate.

Janesville in numbers

Public records for Janesville and its county, not estimates. Each figure shows its source.

  • #48of 209Janesville ranks #48 of the 209 cities we cover for freeze-thaw days.

Hail reports per year in the county

Hail events per year in the county, 2017 to 2026* 3 2017 3 2018 2 2019 2 2020 4 2021 9 2022 2 2023 10 2024 18 2025 10 2026*
Hail events per year in the county, 2017 to 2026*
20173
20183
20192
20202
20214
20229
20232
202410
202518
2026*10

63 recorded events across 9 full years plus 2026 to June represented in the data, about 5.9 per represented full year. 2025 had the most events among represented full years: 18.

2026 covers only January to June: NOAA's file ends there, so it is not counted as the worst year or in the yearly average.

Source: NOAA hail events, county level · data as of 2017–2026*

Costliest storm day on record

Jun 22, 2024

6 reports that day (5 wind, 1 tornado); reported property damage $24,808,000; county FIPS 55105, 2014–June 2026

Source: NOAA Storm Events · data as of 2014–June 2026

When storms hit Janesville

Hail reports by month in the county, all years combined 0 Jan 1 Feb 5 Mar 23 Apr 10 May 7 Jun 10 Jul 12 Aug 5 Sep 1 Oct 0 Nov 0 Dec
Hail reports by month in the county, all years combined
Jan0
Feb1
Mar5
Apr23
May10
Jun7
Jul10
Aug12
Sep5
Oct1
Nov0
Dec0

Most hail reports come in April; the season runs March to September. Book inspections and repairs before that window, not after.

Source: NOAA Storm Events · data as of 2014–June 2026

Roofing trade around Janesville

  • 21 roofing companies with payroll in the county, employing about 55 people; 76% have fewer than 5 employees.
  • A roofer's median pay here is $63,310 a year (Janesville-Beloit, WI Metro Area).
Source: Census CBP · data as of 2023 Source: BLS OEWS, roofers · data as of May 2025

Janesville storm record: Rock County

What the National Weather Service logged in Rock County in 2014–2026. County level, because storm reports are filed by county, not by city limits.

  • 1853Founded
  • 853 ft (260 m)Elevation

Where hail of 1 inch or more was reported in Rock County

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  • 431 to 1.74 in
  • 141.75 to 2.74 in, golf ball to tennis ball
  • 32.75 in and up, baseball

Largest plotted stone: 2.75 in. Bigger dots are bigger stones.

60 reports of 1 inch or larger have coordinates. Each dot is a reported location, not a storm path.

Sources: NOAA, Census county outline

Biggest hail days

DateLargest hailReports that dayWhere it was reported
April 18, 2025 2.75 in, about the size of a baseball 11 Evansville
July 23, 2022 2 in, about the size of a hen egg 5 Mallwood
April 17, 2026 2 in, about the size of a hen egg 4 Beloit
“Numerous reports of wind damage were received. Destructive, large hail and flash flooding also occurred.”
National Weather Service report, July 23, 2022
Source: NOAA Storm Events Database · data as of 2014–2026

Last big hail on record

April 17, 2026

Hail of 1.75 inches (golf ball) or larger fell on 4 days in 2014–2026. Our records end where NOAA's do, so a newer storm may not be listed yet.

Strongest tornado

EF2 · February 8, 2024

It stayed on the ground for 13.71 miles and was up to 750 yards wide. Beginning section of the second tornado to ever occur in February in Wisconsin. Storm chaser/spotter/public videos show the tornado beginning around 5:39pm south of Evansville.

Strongest thunderstorm gust

85 mph · June 10, 2026

Trained spotter estimates 85 MPH wind gusts from observations and home weather station.

What it means for roof repair

Hail up to 2.75 inches has been reported in Rock County. Hail bruises and cracked shingles often show up weeks later as leaks, so a repair quote here should start with an inspection of the whole slope, not only the spot that drips.

Storm data: NOAA Storm Events (public domain). City facts: Wikidata (CC0).

What it costs in Janesville

Asphalt-shingle re-roof, 2,000 sq ft home, adjusted for Janesville labor and material prices. Your quote depends on roof size, pitch and scope.

That typical price is about 5.1% of the median Janesville home value ($209,700).

Source: Census ACS (Janesville city) · data as of 2019–2023

Full Janesville cost guide by material →

What Janesville's climate means for roof repair

  • Most Janesville repair calls trace to freeze-thaw: cracked sealant, lifted shingles, and failed flashing that let meltwater in — catch these before they reach the deck.
  • Ice-dam repairs are routine in Janesville — improving eave flashing and attic ventilation fixes the cause, not just the stain.

Roofers in Janesville, WI

22 listed, first 20 shown. Roofers we verified against a public registry come first.

This list covers roofing companies generally. Confirm roof repair experience, materials, insurance and current availability with each company. A Verified badge refers to the registry check, not a confirmed specialty.

Roof Repair in Janesville: questions

How do I find a roof repair company in Janesville?
PickARoofer lists roofing companies serving Janesville, WI. This is a general roofing directory; confirm roof repair experience and availability with each company. A Verified 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; a response or start date is not guaranteed. Free for homeowners.
Should I repair or fully re-roof in Janesville?
Ask a roofer to document the damage and compare a written repair scope with a replacement estimate. Roof condition, remaining life, materials and the extent of damage affect the decision. Confirm any inspection fee before booking.
How old are the homes in Janesville, and does it matter for the roof?
The median home in Janesville was built in 1972, and 63.2% of homes date from before 1980 (Census ACS). A roof on a home that old has often been re-covered at least once, so ask the roofer whether there is a second layer underneath: it changes the tear-off cost. The area sees about 95 freeze-thaw days a year, which loosens flashing and sealant.
What does roofing cost in Janesville?
For an average 2,000 sq ft home we model asphalt-shingle re-roof at $6,580 to $14,570 in Janesville, around $10,600 in the middle. That is about 5.1% of the median home value of $209,700. Your quote moves with roof size, pitch and how many layers come off.
When is hail season in Janesville?
April is the worst month: 31% of the 74 hail reports NOAA holds for the county came then. Reports run from March to September. Book the inspection before March, while crews still have open dates.
How many roofing companies work around Janesville?
The Census Bureau counts 21 roofing companies with payroll in Rock County, employing about 55 people. 76.2% of them have fewer than five employees, so most quotes come from owner-run crews. A roofer's median pay is $63,310 a year (BLS).
How big does hail get near Janesville?
The largest hail NOAA logged near Janesville measured 2.75 inches, about the size of a baseball. Hail of an inch or more fell on 25 days in the same record. The biggest day was April 18, 2025, with 11 reports. The National Weather Service calls hail of 1 inch or larger severe; the bigger the stone, the more likely it is to crack a shingle.
What causes most roof leaks in Janesville homes?
Freeze-thaw cycling is responsible for the majority of Janesville roof repair calls: water works into a small gap — at a chimney seal, step flashing joint, or a lifted shingle tab — freezes overnight, expands, and opens the gap wider. By spring the entry point is large enough to allow active leaking every rain event. Flashing repairs and re-sealing penetrations each fall, before the first hard freeze, is the most cost-effective maintenance step for Janesville homeowners.
How do I know if a Janesville roof repair will hold, or if I need a full replacement?
A repair holds when it addresses the actual entry point and the surrounding shingles and underlayment are still in sound condition. The rough rule: if the roof is under 15 years old and damaged area covers less than 30 percent of the surface, a repair is usually the right call. Past 20 years, or when repair cost approaches half the replacement estimate, a full tear-off makes more financial sense long-term. A free inspection from a Janesville contractor settles the question without any obligation.
Do I need a permit for roof repair 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.

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Figures above: NOAA Storm Events Database (hail, wind, tornado; county of the city, 2014–2026), U.S. Census Bureau American Community Survey 5-year estimates (housing), NASA POWER (temperature and rain, 2014–2023). Prices: our published price method. How we collect data.