Largest assessment increases in Ardsley, 2025 to 2026
Comparing the 2025 and 2026 rolls parcel by parcel, 1,361 Ardsley properties rose in assessed value, 18 fell, and 7 were essentially unchanged. This page lists the 50 largest increases by percentage.
A jump this size almost always has a specific cause: a completed renovation or addition, a teardown replaced by new construction, a subdivision, or a correction to a parcel the assessor had previously undervalued. A large increase is not by itself evidence of an error.
What makes an increase worth a second look is context. If your assessment rose sharply while comparable homes on your street barely moved, that gap is the thing to investigate — not the raw percentage. The median by street table shows what typical movement looked like near you, and grievance season in Westchester covers the deadlines and the process if you decide to challenge it.
Parcels assessed under $200,000 on the prior roll are excluded. At that end, percentage swings are usually reclassifications or data corrections rather than anything meaningful about a homeowner's bill.
| # | Address | Change | Full market value | Assessed | Est. annual tax |
|---|---|---|---|---|---|
| 1 | 88 Hilltop Rd | +133.5% | $1,326,200 | $1,326,200 | $49,062 |
| 2 | 11 Morningside Rd | +53.9% | $911,100 | $911,100 | $33,706 |
| 3 | 29 Plainview Ave | +43.8% | $1,212,800 | $1,212,800 | $44,867 |
| 4 | 36 Western Dr | +43.3% | $913,800 | $913,800 | $33,805 |
| 5 | 20 Grandview Ave | +38.4% | $907,600 | $907,600 | $33,577 |
| 6 | 3 Shady Rd | +32.1% | $1,262,900 | $1,262,900 | $46,720 |
| 7 | 41 Ridge Rd | +30.6% | $1,175,200 | $1,175,200 | $43,476 |
| 8 | 20 Victoria Rd | +29.6% | $1,069,200 | $1,069,200 | $39,554 |
| 9 | 19 Agnes Cir | +28.7% | $1,272,300 | $1,272,300 | $47,068 |
| 10 | 24 Western Dr | +28.6% | $948,700 | $948,700 | $35,097 |
| 11 | 60 Bramble Brook Rd | +25.7% | $1,342,200 | $1,342,200 | $49,653 |
| 12 | 38 Sheffield Ct | +24.8% | $809,800 | $809,800 | $29,959 |
| 13 | 5 Summit Ave | +24.6% | $1,300,800 | $1,300,800 | $48,122 |
| 14 | 182 Heatherdell Rd | +24.1% | $541,800 | $541,800 | $20,043 |
| 15 | 15 Plainview Ave | +23.4% | $1,326,700 | $1,326,700 | $49,080 |
| 16 | 8 Mill Ct | +23.1% | $693,300 | $693,300 | $25,649 |
| 17 | 124 Huntley Dr | +22.8% | $988,600 | $988,600 | $36,572 |
| 18 | 16 Victoria Rd | +22.8% | $947,600 | $947,600 | $35,055 |
| 19 | 19 Fairmont Ave | +22.6% | $888,900 | $888,900 | $32,884 |
| 20 | 19 Old Mill Ln | +22.6% | $764,300 | $764,300 | $28,274 |
| 21 | 4 Mill Ct | +22.6% | $806,500 | $806,500 | $29,836 |
| 22 | 6 Rockridge Rd | +22.4% | $1,230,200 | $1,230,200 | $45,510 |
| 23 | 23 Old Mill Ln | +22.3% | $772,200 | $772,200 | $28,567 |
| 24 | 12 Old Mill Ln | +22.2% | $752,200 | $752,200 | $27,827 |
| 25 | 11 Beacon Hill Rd | +22.1% | $1,245,400 | $1,245,400 | $46,074 |
| 26 | 22 Old Mill Ln | +22.1% | $781,000 | $781,000 | $28,892 |
| 27 | 21 Old Mill Ln | +22.0% | $816,800 | $816,800 | $30,217 |
| 28 | 3 Mill Ct | +21.8% | $745,700 | $745,700 | $27,587 |
| 29 | 14 Old Mill Ln | +21.8% | $767,900 | $767,900 | $28,407 |
| 30 | 34 Sheffield Ct | +21.7% | $768,800 | $768,800 | $28,442 |
| 31 | 29 Old Mill Ln | +21.7% | $731,800 | $731,800 | $27,073 |
| 32 | 28 Old Mill Ln | +21.7% | $782,400 | $782,400 | $28,944 |
| 33 | 25 Old Mill Ln | +21.6% | $859,200 | $859,200 | $31,785 |
| 34 | 11 Mill Ct | +21.6% | $688,600 | $688,600 | $25,474 |
| 35 | 39 Sheffield Ct | +21.3% | $805,500 | $805,500 | $29,799 |
| 36 | 31 Sheffield Ct | +21.2% | $791,400 | $791,400 | $29,278 |
| 37 | 6 Mill Ct | +21.2% | $753,800 | $753,800 | $27,886 |
| 38 | 15 Old Mill Ln | +20.8% | $785,500 | $785,500 | $29,059 |
| 39 | 154 Heatherdell Rd | +20.5% | $966,800 | $966,800 | $35,766 |
| 40 | 24 Old Mill Ln | +20.5% | $739,500 | $739,500 | $27,357 |
| 41 | 1 Mill Ct | +20.5% | $807,500 | $807,500 | $29,873 |
| 42 | 38 Ridge Rd | +19.7% | $815,800 | $815,800 | $30,179 |
| 43 | 11 Exeter Pl | +18.6% | $931,400 | $931,400 | $34,457 |
| 44 | 35 Sheffield Ct | +18.3% | $826,400 | $826,400 | $30,572 |
| 45 | 95 Ridge Rd | +18.3% | $1,233,800 | $1,233,800 | $45,644 |
| 46 | 21 Concord Rd | +18.1% | $1,288,500 | $1,288,500 | $47,668 |
| 47 | 611 Ashford Ave | +17.6% | $1,542,600 | $1,542,600 | $57,068 |
| 48 | 68 Lincoln Ave | +17.2% | $797,600 | $797,600 | $29,506 |
| 49 | 649 Ashford Ave | +17.0% | $1,607,900 | $1,607,900 | $59,483 |
| 50 | 17 Old Mill Ln | +16.8% | $775,000 | $775,000 | $28,671 |
Source: Ardsley 2026 assessment roll (SWIS 552601), compiled by Infarill LLC. Estimated taxes use county, school, and village mill rates for FY 2025-2026 village / 2025-26 school and exclude special district charges. Dale Ledger is unofficial and not affiliated with any municipality or school district — confirm on the Village of Ardsley.
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FAQ
Why did my Ardsley assessment go up in 2026?
Common causes are a completed renovation or addition, new construction, a subdivision, or a revaluation correcting a previously low assessment. The assessor's office can tell you which applies to your parcel.
Can I challenge an assessment increase?
Yes. New York has a formal grievance process with fixed annual deadlines. An increase alone is not grounds — the question is whether your assessment reflects market value relative to comparable properties.
Unofficial. Confirm figures on the Village of Ardsley and the Town of Greenburgh assessor before decisions.