2023 Revaluation

The Village is undertaking a Village-wide revaluation during 2023. Thiensville property owners will receive a New Notice of Assessment, mailed on 4/25/2023. It will include an updated assessment valuation, contact information for questions, and an explanation of the revaluation process.

The Village has not conducted a revaluation since 2015. State law requires periodic revaluations to address property value changes. Over time, property values can change unequally. The purpose of a revaluation is not to collect more taxes, but to correct any inequities to differing types of property that can occur over time. The purpose is to distribute the tax burden equitably among the taxable properties. The Village is undertaking a Market Update Revaluation. This type of revaluation, conducted mostly in-house by the assessor’s office, analyzes recent sales in Thiensville and uses the information to determine new assessed values that reflect current market values. Market value is defined as “the most probable price at which a property should bring in a competitive and open market under all conditions requisite to a fair sale, the buyer and seller each acting prudently, knowledgeable and assuming the price is not affected by undue stimulus.”

After receiving new assessment notices, Thiensville property owners will have an opportunity to discuss the new assessed valuation with Village Assessor Les Ahrens or his staff if there is belief that the Assessor’s Office made an error or did not have sufficient information. This will take place at the Open Book meeting, which will occur in May and usually can be conducted by email or telephone. Residents then have an opportunity to appeal an assessment to the Village’s Board of Review in  June.

Did you know?

Here are some facts and sources to help better understand assessing in the area:  

  • The last update of values in Thiensville was 2015.
  • Values will be updated in 2023 to reflect market value as of January 2023
  • The average increase in residential property in Ozaukee County in 2021 and 2022 was 12% and 8.5% (Wisconsin Realtors Association)
  • Your assessment is determined by the sales of similar properties

Property Information

  • To access NEW 2023 assessor data information, please click here.
  •  Access previous Ozaukee County Tax Data Search

Tax Roll

The average property increase after the village-wide revaluation in the preliminary assessment roll is 47.7%.

Important Info


Open Book:  In person May 17, 2023 from 9:00 am to Noon and 1:00 pm to 4:00 pm at the Village Hall. Appointments are recommended, call 262-253-1142 to reserve a specific time.  OR you may contact the assessor any time before the end of the Open Book by email or phone. Email is preferred. 
Board of Review: June 28, 2023 from 9:00 am to 11:00 am at the Village Hall.

Assessor:   Mike Smigielski,  mikes@catalisgov.com 262-253-1142

Municipal clerk:Administrator, Colleen Landisch-Hansen 262-242-3720
Open book and BOR Location: The Thiensville Village Hall is located at 250 Elm St