Largest assessment increases in Mamaroneck, 2025 to 2026
Comparing the 2025 and 2026 rolls parcel by parcel, 2,952 Mamaroneck properties rose in assessed value, 108 fell, and 60 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 | 7 Split Tree Rd | +561.6% | $4,320,000 | $4,320,000 | $96,415 |
| 2 | 104 Premium Pt | +221.3% | $13,175,000 | $13,175,000 | $279,217 |
| 3 | 20 Valley Rd | +120.8% | $2,685,000 | $2,685,000 | $56,903 |
| 4 | 8 Highclere Ct | +107.9% | $3,119,000 | $3,119,000 | $66,101 |
| 5 | 87 Colonial Ave | +85.2% | $3,120,000 | $3,120,000 | $66,122 |
| 6 | 7 Hudson Pl | +65.1% | $2,476,000 | $2,476,000 | $52,473 |
| 7 | 24 Greystone Rd | +59.0% | $1,534,000 | $1,534,000 | $32,510 |
| 8 | 8 Prince Willows Ln | +58.1% | $751,000 | $751,000 | $16,761 |
| 9 | 21 Rockland Ave | +41.3% | $1,522,000 | $1,522,000 | $32,256 |
| 10 | 765 Forest Ave | +39.1% | $1,596,000 | $1,596,000 | $33,824 |
| 11 | 14 Dillon Rd | +38.9% | $1,214,000 | $1,214,000 | $25,728 |
| 12 | 2 Wagon Wheel Rd | +37.3% | $1,175,000 | $1,175,000 | $24,901 |
| 13 | 4 Cottage Cir | +37.2% | $1,268,000 | $1,268,000 | $26,872 |
| 14 | 57 Moran Pl | +37.2% | $1,692,000 | $1,692,000 | $35,859 |
| 15 | 767 Forest Ave | +36.1% | $2,395,000 | $2,395,000 | $50,757 |
| 16 | 3 Glenn Rd | +33.4% | $1,715,000 | $1,715,000 | $36,346 |
| 17 | 5 Larch Ln | +32.9% | $2,390,000 | $2,390,000 | $50,651 |
| 18 | 833 Fenimore Rd | +32.6% | $1,455,000 | $1,455,000 | $30,836 |
| 19 | 290 Weaver St | +32.4% | $1,784,000 | $1,784,000 | $37,808 |
| 20 | 29 Carriage House Ln | +31.2% | $2,788,000 | $2,788,000 | $62,223 |
| 21 | 18 Wildwood Rd | +31.1% | $1,982,000 | $1,982,000 | $42,005 |
| 22 | 6 Fairway Dr | +29.8% | $2,114,000 | $2,114,000 | $47,181 |
| 23 | 2 Fernwood Rd | +29.6% | $1,328,000 | $1,328,000 | $28,144 |
| 24 | 18 Carleon Ave | +28.2% | $2,234,000 | $2,234,000 | $47,345 |
| 25 | 6 Pheasant Run | +27.8% | $1,560,000 | $1,560,000 | $33,061 |
| 26 | 17 Byron Ln | +26.5% | $2,165,000 | $2,165,000 | $45,883 |
| 27 | 84 Lookout Cir | +25.9% | $1,674,000 | $1,674,000 | $35,477 |
| 28 | 8 Prince Willows Ln | +25.7% | $1,394,000 | $1,394,000 | $29,543 |
| 29 | 4 Boulder Brae Ln | +24.9% | $1,502,000 | $1,502,000 | $31,832 |
| 30 | 8 Briar Close | +24.4% | $1,999,000 | $1,999,000 | $42,365 |
| 31 | 22 Winged Foot Dr | +24.1% | $3,055,000 | $3,055,000 | $64,745 |
| 32 | 9 Normandy Rd | +24.0% | $1,776,000 | $1,776,000 | $37,639 |
| 33 | 69 Hillcrest Ave | +23.7% | $1,070,000 | $1,070,000 | $22,677 |
| 34 | 51 Ellsworth Rd | +22.5% | $2,149,000 | $2,149,000 | $45,544 |
| 35 | 7 Oxford Rd | +22.4% | $2,630,000 | $2,630,000 | $55,737 |
| 36 | 45 Dillon Rd | +22.3% | $1,303,000 | $1,303,000 | $27,614 |
| 37 | 100 Madison Ave | +22.3% | $1,835,000 | $1,835,000 | $38,889 |
| 38 | 6 Highwood Ave | +22.1% | $1,679,000 | $1,679,000 | $35,583 |
| 39 | 116 Carleon Ave | +21.9% | $2,240,000 | $2,240,000 | $47,472 |
| 40 | 6 Murdock Rd | +21.8% | $1,814,000 | $1,814,000 | $40,485 |
| 41 | 19 Rock Ridge Rd | +21.3% | $985,000 | $985,000 | $20,876 |
| 42 | 189 Weaver St | +20.1% | $820,000 | $820,000 | $17,378 |
| 43 | 1015 Old White Plains Rd | +19.4% | $1,284,000 | $1,284,000 | $27,211 |
| 44 | 31 Mohegan Rd | +19.2% | $1,605,000 | $1,605,000 | $34,014 |
| 45 | 44 Country Rd | +19.0% | $1,575,000 | $1,575,000 | $33,379 |
| 46 | 127 Chatsworth Ave | +18.8% | $1,478,000 | $1,478,000 | $31,323 |
| 47 | 225 Rockingstone Ave | +18.1% | $1,890,000 | $1,890,000 | $40,055 |
| 48 | 287 Rockingstone Ave | +17.9% | $2,145,000 | $2,145,000 | $45,459 |
| 49 | 6 Sackett Dr | +17.7% | $1,730,000 | $1,730,000 | $36,664 |
| 50 | 1 Boulder Rd | +17.0% | $1,937,000 | $1,937,000 | $41,051 |
Source: Mamaroneck 2026 assessment roll (SWIS 553289), compiled by Infarill LLC. Estimated taxes use county, school, and village mill rates for FY 2026 town & county / 2025-26 school and exclude special district charges. Dale Ledger is unofficial and not affiliated with any municipality or school district — confirm on the Town of Mamaroneck assessor.
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FAQ
Why did my Mamaroneck 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 with the Town of Mamaroneck assessor before decisions. This edition covers the unincorporated town; the villages of Larchmont and Mamaroneck have their own rolls.