Largest assessment increases in New Castle, 2025 to 2026
Between the 2025 and 2026 rolls, 230 New Castle properties went up in assessed value, 101 went down, and 5,552 stayed about the same. This page lists the 50 biggest increases by percentage.
Increases this large usually come from a finished renovation or addition, a teardown replaced by new construction, a subdivision, or a correction to a parcel the assessor had valued too low. A big increase alone does not mean the assessment is wrong.
If your assessment rose sharply and similar homes on your street barely changed, ask the assessor why. The median by street table shows how much a typical home on each street changed. Grievance season in Westchester covers the deadlines and the process if you decide to challenge your assessment.
Parcels with a full market value under $200,000 on the prior roll are left out. At that size, a large percentage change is usually a reclassification or a data correction.
| # | Address | Change | Full market value | Assessed | Est. annual tax |
|---|---|---|---|---|---|
| 1 | 1 Dewitt Drive | +382.9% | $1,812,186 | $252,800 | $40,793 |
| 2 | 5 Dewitt Drive | +368.7% | $1,758,781 | $245,350 | $39,591 |
| 3 | 2 Dewitt Drive | +347.8% | $1,680,287 | $234,400 | $37,824 |
| 4 | 24 Dewitt Drive | +339.0% | $1,647,312 | $229,800 | $37,082 |
| 5 | 26 Dewitt Drive | +334.7% | $1,631,183 | $227,550 | $36,718 |
| 6 | 18 Dewitt Drive | +299.7% | $1,500,000 | $209,250 | $33,765 |
| 7 | 20 Dewitt Drive | +299.7% | $1,500,000 | $209,250 | $33,765 |
| 8 | 22 Dewitt Drive | +299.7% | $1,500,000 | $209,250 | $33,765 |
| 9 | 3 Dewitt Drive | +299.7% | $1,500,000 | $209,250 | $33,765 |
| 10 | 7 Dewitt Drive | +299.7% | $1,500,000 | $209,250 | $33,765 |
| 11 | 9 Dewitt Drive | +299.7% | $1,500,000 | $209,250 | $33,765 |
| 12 | 4 Dewitt Drive | +299.3% | $1,498,566 | $209,050 | $33,734 |
| 13 | 256 Quaker St | +248.7% | $1,950,000 | $272,025 | $43,895 |
| 14 | 6 Dewitt Drive | +233.3% | $1,250,896 | $174,500 | $28,158 |
| 15 | 8 Dewitt Drive | +233.3% | $1,250,896 | $174,500 | $28,158 |
| 16 | 10 Dewitt Drive | +233.3% | $1,250,896 | $174,500 | $28,158 |
| 17 | 12 Dewitt Drive | +233.3% | $1,250,896 | $174,500 | $28,158 |
| 18 | 14 Dewitt Drive | +233.3% | $1,250,896 | $174,500 | $28,158 |
| 19 | 16 Dewitt Drive | +233.3% | $1,250,896 | $174,500 | $28,158 |
| 20 | 2 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 21 | 4 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 22 | 6 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 23 | 8 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 24 | 10 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 25 | 12 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 26 | 14 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 27 | 16 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 28 | 18 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 29 | 20 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 30 | 22 Carriage Lane | +166.5% | $1,000,000 | $139,500 | $22,511 |
| 31 | 43 Lila Lane | +142.9% | $1,837,276 | $256,300 | $41,358 |
| 32 | 45 Lila Lane | +133.1% | $1,763,082 | $245,950 | $39,687 |
| 33 | 51 Granite Ct | +117.5% | $2,449,821 | $341,750 | $55,147 |
| 34 | 41 Lila Lane | +114.7% | $1,624,373 | $226,600 | $36,565 |
| 35 | 18 Brandon Dr | +98.3% | $2,000,000 | $279,000 | $45,020 |
| 36 | 35 Lila Lane | +97.3% | $1,989,606 | $277,550 | $44,787 |
| 37 | 31 Lila Lane | +78.9% | $1,804,301 | $251,700 | $40,616 |
| 38 | 23 Lila Lane | +78.5% | $1,800,000 | $251,100 | $40,519 |
| 39 | 33 Lila Lane | +75.4% | $1,769,534 | $246,850 | $39,833 |
| 40 | 5 Lila Lane | +74.0% | $1,755,197 | $244,850 | $39,510 |
| 41 | 27 Lila Lane | +73.0% | $1,744,803 | $243,400 | $39,276 |
| 42 | 11 Elm St | +71.2% | $674,910 | $94,150 | $15,192 |
| 43 | 25 Spruce Ln N | +70.6% | $1,209,677 | $168,750 | $27,231 |
| 44 | 15 Martha Pl | +65.4% | $1,250,896 | $174,500 | $28,158 |
| 45 | 15 Lila Lane | +65.1% | $1,665,591 | $232,350 | $37,493 |
| 46 | 21 Lila Lane | +62.7% | $1,640,502 | $228,850 | $36,928 |
| 47 | 540 King St | +61.4% | $913,978 | $127,500 | $20,575 |
| 48 | 39 Lila Lane | +61.3% | $1,626,523 | $226,900 | $36,614 |
| 49 | 3 Lila Lane | +59.5% | $1,608,961 | $224,450 | $36,219 |
| 50 | 7 Lila Lane | +58.5% | $1,598,566 | $223,000 | $35,984 |
Source: New Castle 2026 assessment roll (SWIS 553600), compiled by Infarill LLC. Estimated taxes use county, school, and village mill rates for fiscal year 2026 town & county / 2026-27 school and leave out special district charges. Dale Ledger is unofficial and is not affiliated with any municipality or school district. Check figures with the Town of New Castle Assessor.
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FAQ
Why did my New Castle assessment go up in 2026?
Common causes are a finished renovation or addition, new construction, a subdivision, or a correction to an assessment that was too low. The assessor's office can tell you which one applies to your parcel.
Can I challenge an assessment increase?
Yes. New York has a formal grievance process with set yearly deadlines. An increase on its own is not grounds for a grievance. The question is whether your assessment is too high compared with similar properties.
Unofficial. Confirm figures with the Town of New Castle Assessor before you act on them. New Castle covers Chappaqua and Millwood.