City of Sun Prairie Revaluation 

2026 is a revaluation year for all properties in the City of Sun Prairie and the Assessors Office will be changing all assessments to reflect market value on all properties as of January 1. Market value is determined using the arms-length sales that have occurred in Sun Prairie.

The Assessors Office will be reviewing descriptions on all properties. We will NOT be doing interior inspections on all properties. Instead, staff will verify/validate the current interior descriptions of properties. Staff will use digital imaging, when possible, for the exterior reviews. Some exterior reviews in the filed may be necessary. 

We anticipate the 2026 values to be sent out in late July. Please note that increasing the assessed values does not mean everyone will have higher taxes. 

Revaluation Myth vs. Fact


Informational Media


Click here to listen to an interview with our City Assessor, Pete Krystowiak, to learn more about this year's Revaluation Process. 

Revaluation FAQs

Did You Know? 

  • The 2025 assessed value of the City of Sun Prairie was $5,709,187,900. 
  • The last update of property values in Sun prairie was 2023. 
  • The average increase in residential property sale price for Dane County in 2023, 2024 and 2025 was 6.5%, 8.1% and 2.7% (Wisconsin Realtors Association). 
  • Your assessment is determined by the sales of similar properties. 

Residential Sales (2024-2026) 

See here for a list of recent sales in the area: Sales Excel sheet