Waukesha County property records for 19 addresses on W Kostner Ln, New Berlin, WI · Last verified October 2026
| Properties | 19 |
|---|---|
| Median Sale Price | $230,000 |
| Deeds and Mortgages on File | 24 |
| Median Price per Sqft | $134 |
| Owner Occupied | 84% |
| Median Annual Tax Bill | $3,952 |
| Median Year Built | 1960 |
| Median Ownership Tenure | 10 years |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14005 W Kostner Ln |
3 bd · 11,094 sqft built 1970 · 0.53 acres | $440,000 Nov 2016 | $6,998 2025 | Assessor Updated Sep 2026 | Owner on File |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14020 W Kostner Ln |
3 bd · 1.5 ba · 1,569 sqft built 1965 · 0.389 acres | $92,500 Apr 2011 | $3,952 2025 | Assessor Updated Aug 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14104 W Kostner Ln |
2 bd · 1 ba · 1,200 sqft built 1942 · 0.4 acres | $118,500 May 2002 | $2,847 2025 | Assessor + 5 Documents Updated Oct 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14114 W Kostner Ln |
3 bd · 1.5 ba · 1,402 sqft built 1962 · 0.4 acres | $169,900 May 2003 | $3,508 2025 | Assessor + 2 Documents Updated Oct 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14200 W Kostner Ln |
2 bd · 1 ba · 1,087 sqft built 1947 · 0.4 acres | $125,900 Sep 1998 | $3,277 2025 | Assessor Updated Jul 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14201 W Kostner Ln |
9.21 acres | Assessor Updated Jul 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14208 W Kostner Ln |
3 bd · 1.5 ba · 1,149 sqft built 1960 · 0.4 acres | $305,000 Nov 2022 | $4,399 2025 | Assessor + 1 Document Updated Oct 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14300 W Kostner Ln |
2 bd · 1 ba · 873 sqft built 1951 · 0.4 acres | — Jun 2023 | $2,614 2025 | Assessor + 1 Document Updated Jul 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14302 W Kostner Ln |
3 bd · 1.5 ba · 1,050 sqft built 1961 · 0.3 acres | $158,800 Jun 2023 | $4,070 2025 | Assessor + 2 Documents Updated Oct 2026 | Owner on File |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14314 W Kostner Ln |
4 bd · 1.5 ba · 1,372 sqft built 1944 · 0.3 acres | $116,900 Sep 1997 | $2,562 2025 | Assessor Updated Jul 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14322 W Kostner Ln |
2 bd · 1 ba · 1,152 sqft built 1947 · 0.389 acres | $83,000 May 2022 | $2,853 2025 | Assessor + 2 Documents Updated Sep 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14408 W Kostner Ln |
3 bd · 1 ba · 1,226 sqft built 1965 · 0.389 acres | $440,000 May 2026 | $3,590 2025 | Assessor + 3 Documents Updated Oct 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14420 W Kostner Ln |
3 bd · 2.5 ba · 3,114 sqft built 1960 · 0.389 acres | $120,000 Jul 2011 | $5,226 2025 | Assessor + 2 Documents Updated Oct 2026 | Owner on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14504 W Kostner Ln |
4 bd · 2.5 ba · 1,890 sqft built 1976 · 0.389 acres | $4,358 2025 | Assessor Updated Jul 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14505 W Kostner Ln |
3 bd · 1.5 ba · 1,296 sqft built 1974 · 0.219 acres | $129,500 Apr 1998 | $3,211 2025 | Assessor Updated Jul 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14514 W Kostner Ln |
4 bd · 1.5 ba · 1,389 sqft built 1949 · 0.389 acres | $165,000 Dec 2016 | $4,913 2025 | Assessor Updated Jul 2026 | 2 Owners on File |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14515 W Kostner Ln |
4 bd · 1.5 ba · 1,705 sqft built 1974 · 0.26 acres | $230,000 Feb 2016 | $3,958 2025 | Assessor + 1 Document Updated Oct 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14524 W Kostner Ln |
4 bd · 2.5 ba · 1,618 sqft built 1948 · 0.38 acres | $85,000 May 2008 | $4,248 2025 | Assessor + 5 Documents Updated Oct 2026 | 2 Owners on File Owner Occupied |
| Address | Details | Last Sale | Tax Bill | Records | Owner |
|---|---|---|---|---|---|
14606 W Kostner Ln |
2 bd · 1 ba · 1,205 sqft built 1948 · 0.289 acres | $3,350 2025 | Assessor Updated Jul 2026 | 2 Owners on File Owner Occupied |