Wisconsin window replacement leads
Summit Leads supplies window replacement leads in Wisconsin through real-time ping/post, exclusive by default, with ZIP code filters. All of Wisconsin is in the Northern zone of the ENERGY STAR climate zone map (August 2025), and more than half of its housing units were built before 1980.
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Wisconsin facts for window replacement lead buyers
| Fact | Value Source |
|---|---|
| Housing units built before 1980 | 57.0% (ACS 5-year 2020-2024, table B25034)Table B25034, Year Structure Built: Wisconsin (ACS 5-Year 2020-2024) U.S. Census Bureau |
| Housing units built 1939 or earlier | 495,155 (ACS 5-year 2020-2024, table B25034)Table B25034, Year Structure Built: Wisconsin (ACS 5-Year 2020-2024) U.S. Census Bureau |
| Median year structure built | 1975 (ACS 5-year 2020-2024)Table B25035, Median Year Structure Built: Wisconsin (ACS 5-Year 2020-2024) U.S. Census Bureau |
| ENERGY STAR window climate zone | Northern, statewide (ENERGY STAR climate zone map, August 2025)ENERGY STAR Windows, Doors and Skylights Climate Zone Map (August 2025) U.S. EPA ENERGY STAR |
| IECC 2021 climate zones | Zone 6A in 42 counties and zone 5A in 30 (PNNL for DOE, 2021 county data)Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270) Pacific Northwest National Laboratory for the U.S. Department of Energy |
| Residential energy code | 2009 IECC with amendments, adopted December 1, 2015, effective January 1, 2016 (DOE, checked October 7, 2026)Building Energy Codes Program: Wisconsin U.S. Department of Energy |
| Median home value | $266,500 (ACS 5-year 2020-2024, table B25077)Table B25077, Median Value (Dollars): Wisconsin (ACS 5-Year 2020-2024) U.S. Census Bureau |
Last reviewed: October 7, 2026. A summary for education, not legal advice.
Wisconsin's old housing stock
Wisconsin has a large stock of very old homes. In table B25034 (ACS 5-year 2020-2024), 495,155 housing units were built in 1939 or earlier, more than any other single age band in the table, and 57.0% of all units were built before 1980. The second-largest band is the 1970s, with 394,494 units, followed by the 1950s with 285,081. Homes from those two decades are now roughly 45 to 75 years old.
The middle of the range is 1975: that is the median year built in table B25035 (ACS 5-year 2020-2024). The median owner-occupied home is valued at $266,500 in table B25077 (ACS 5-year 2020-2024).
For window buyers, the pre-1940 band is the one to plan around. Those homes are more likely to have original sash, storm windows over single glazing, or openings that are not a standard size, so a crew needs measurements before it can quote. Asking for the approximate year built on the request lets a buyer route those homes to installers who handle custom work.
Wisconsin window and code climate zones
On the ENERGY STAR climate zone map (August 2025), Wisconsin sits wholly in the Northern zone. A buyer can apply one set of ENERGY STAR window criteria to every Wisconsin ZIP code in an order.
The IECC map divides the state. The Department of Energy's county guide, PNNL-33270 (2021 county data), assigns 42 Wisconsin counties to zone 6A and 30 to zone 5A; DOE uses A for moist climates. Most counties in the state are in the colder of the two zones, which matters for a buyer who sells into both the Milwaukee and Madison areas and the northern part of the state.
Wisconsin's residential energy code
This section is general information, not legal advice. It summarizes official sources as of October 7, 2026; check the current text of each rule before relying on it.
Homes and commercial buildings are on different editions in Wisconsin. The Department of Energy's Building Energy Codes Program page for Wisconsin (checked October 7, 2026) lists the 2009 IECC with amendments for residential buildings, adopted December 1, 2015 and effective January 1, 2016. The same page lists the 2021 IECC and ASHRAE 90.1-2019 with amendments for commercial buildings, effective November 1, 2025.
A window buyer working both homes and small commercial properties should keep the two codes apart. The Department of Safety and Professional Services is the listed state contact for code adoption.
Wisconsin contractor credentials
This section is general information, not legal advice. It summarizes official sources as of October 7, 2026; check the current text of each rule before relying on it.
Wisconsin links its contractor credential to the building permit for one- and two-family dwellings, and it has a three-business-day cancellation notice for sales made away from the seller's place of business. Both rules, with their statute citations and official sources, are on leads in Wisconsin. Buyers whose window jobs include a permit should confirm the installer holds the state credential before the job is scheduled.
How Wisconsin window buyers narrow an order
- Home age: the pre-1940 band is the largest in the state, and those homes often need custom sizes.
- ZIP code: pick the counties each crew covers; most of the state is in the colder IECC zone.
- Number of windows and scope: a few units, a whole house, or work that needs a permit.
- Homeowner status: only the owner can approve a replacement and sign for it.
Where buyers filter in Wisconsin
All six of Wisconsin's largest metro areas sit inside the state, ranked here by the Census Bureau's July 1, 2025 estimates. Buyers who cover the Fox Valley, the Driftless Area or the northern counties set ZIP codes the same way.
- Milwaukee-Waukesha: 1,575,010 (July 1, 2025 estimate)
- Madison: 709,685 (July 1, 2025 estimate)
- Green Bay: 336,756 (July 1, 2025 estimate)
- Appleton: 249,876 (July 1, 2025 estimate)
- Racine-Mount Pleasant: 198,919 (July 1, 2025 estimate)
- Eau Claire: 176,647 (July 1, 2025 estimate)
Source: Metropolitan and Micropolitan Statistical Area population estimates, Vintage 2025 (cbsa-est2025-alldata), U.S. Census Bureau.
Consent records for Wisconsin window replacement leads
Wisconsin window replacement leads include the TCPATCPAThe Telephone Consumer Protection Act, the federal law that governs telemarketing calls and texts, autodialers, prerecorded voice messages and the Do Not Call Registry. Glossary consent record from the homeowner's form submission. See Wisconsin in the state telemarketing laws table for the state's calling rules, and leads in Wisconsin for the combined MVA and home improvement view.
Wisconsin window replacement lead questions
How many Wisconsin homes were built before 1940?
The Census Bureau counts 495,155 housing units built in 1939 or earlier, in table B25034 of the ACS 5-year estimates for 2020-2024.
Is Wisconsin's residential energy code the 2021 IECC?
No. The DOE Building Energy Codes Program page (checked October 7, 2026) lists the 2009 IECC with amendments for homes, effective January 1, 2016; the 2021 IECC applies to commercial buildings. This is general information, not legal advice.
Which ENERGY STAR zone applies to Wisconsin windows?
The Northern zone, across the whole state, on the ENERGY STAR climate zone map (August 2025).
Can a buyer take Wisconsin window leads only around Madison?
Yes. Buyers choose ZIP codes, so an order can cover the Madison area alone or any mix of counties. Leads are exclusive by default, with shared delivery on request.
Request Wisconsin window replacement leads
Email us the Wisconsin ZIP codes you cover, your daily volume or caps and how you take delivery. ReturnReturnA buyer's request for credit on a lead that fails agreed standards, such as a disconnected number, a duplicate or a lead outside the filters. Glossary terms are agreed on the onboarding call, before you go live.
Start small, with no long-term commitment
- No long-term contract. Pause or stop at any time.
- No setup fee and no monthly fee. You pay only for leads delivered that match your filters.
- Start with a small test volume and scale when the numbers work.
- MVA and home improvement leads are exclusive by default: each lead is sold to one buyer.
- Return terms are agreed on the onboarding call, before you go live.
Or write to team@summitleads.ai. We reply by email.
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