Chappaqua is a large-lot, northern Westchester market where assessed values routinely reflect some of the highest totals in the county. Located within the Town of New Castle, Chappaqua properties are assessed on the New Castle assessment roll — and for homeowners who believe their 2026 assessment overstates current market value, the tax grievance process offers a meaningful opportunity to reduce their annual tax burden.
This article explains the 2026 filing deadline, the appraisal challenges specific to Chappaqua's large-lot market, the SCAR process, and why an SRA-designated appraiser carries particular credibility in a proceeding where evidentiary standards are closely applied.
The 2026 Filing Deadline for Chappaqua (Town of New Castle)
Chappaqua properties are assessed by the Town of New Castle assessor. The 2026 grievance window follows the standard Westchester County schedule: it opens June 1 and closes on the third Tuesday in June. Missing this deadline forfeits your right to challenge the 2026 assessment until the next grievance cycle.
Your grievance is filed with the Town of New Castle Board of Assessment Review (BAR). If the BAR does not grant a satisfactory reduction, you may escalate to a Small Claims Assessment Review (SCAR) proceeding before a hearing officer appointed by the Westchester County Supreme Court, typically within 30 days of the BAR's determination. Filing a grievance carries no risk of your assessment being increased — the BAR and SCAR can only maintain or reduce the assessment.
Because a certified appraisal must be completed before filing, plan ahead. Appraisals require an on-site property inspection plus 5–10 business days for report delivery. Starting the process in early May gives you ample time before the June deadline.
Chappaqua's Large-Lot Market and the Assessment Challenge
Chappaqua's residential market is characterized by large lots, significant lot-to-lot variation in topography and usability, and homes that range widely in size, age, and quality of construction. In this environment, mass appraisal — the methodology municipal assessors use to value thousands of properties at once — faces a fundamental challenge: the variance between individual properties is high, and the publicly available data that mass models rely on (square footage, lot acreage, year built, number of rooms) cannot capture the full range of value-affecting factors.
A two-acre lot in Chappaqua may be highly usable and gently graded, or it may be steeply sloped and partially wetland — yet both appear identical in the assessment record. A 4,000-square-foot home may have been meticulously maintained and updated, or it may have deferred maintenance, dated mechanical systems, and a functional layout that no longer aligns with current buyer preferences. The mass assessment model values both at a similar level; the market does not.
A certified appraiser inspects the subject property in person, documents these physical and functional differences, and applies market-supported adjustments in the final value conclusion. This individualized methodology is precisely what BAR panels and SCAR hearing officers expect as the evidentiary standard for a successful grievance.
High Assessed Values and Why the Savings Potential Is Significant
Chappaqua's high assessed values mean that even a modest percentage reduction in assessment translates to meaningful annual tax savings. A property assessed at $1.5 million that is reduced by 10% saves the homeowner a substantial amount each year — and that savings compounds over multiple years if the reduced assessment is maintained.
Given the potential magnitude of the savings, the cost of a certified appraisal is typically recouped many times over in the first year of a successful grievance. For Chappaqua homeowners with assessments that may significantly overstate current market value, the economics of pursuing a grievance are strongly favorable.
The SCAR Process and SRA Appraiser Credibility
If the BAR does not grant adequate relief, the SCAR process provides an independent second review before a neutral hearing officer. Many Chappaqua homeowners with higher-value properties choose to work with tax certiorari counsel at SCAR, though the proceeding is designed to be accessible without an attorney. At the hearing, you present your certified appraisal; the municipality presents its defense. The hearing officer renders a binding decision.
At SCAR, the credentials of the appraiser who prepared the report are scrutinized directly. An appraisal from an SRA-designated appraiser — the highest professional credential awarded by the Appraisal Institute for residential appraisal — signals to the hearing officer that the analysis was conducted to recognized professional and ethical standards. In Chappaqua's large-lot market, where comparable sales may be limited and adjustments for lot usability and property condition must be carefully justified, the SRA credential is not a formality — it is a meaningful indicator of analytical credibility.
An SRA appraiser working a Chappaqua grievance knows how to identify and justify comparables from an appropriate market area when immediate neighbors haven't sold recently, how to document and quantify condition and functional adjustments that the assessor's model missed, and how to present these conclusions in the format that SCAR hearing officers find most persuasive.
How Madison & Park Appraisal Can Help
At Madison & Park Appraisal, Dave Lister holds the SRA designation and has completed hundreds of appraisals across northern Westchester, including Chappaqua and the Town of New Castle. We are familiar with Chappaqua's large-lot market dynamics, the New Castle assessment roll, and the comparable sales that carry the most evidentiary weight at BAR and SCAR.
Our process is straightforward: contact us for a quote, schedule an inspection, and receive a completed USPAP-compliant appraisal report — typically within 5–10 business days. We also offer expedited service when filing deadlines are approaching.
To learn more about our certified appraisal services for Chappaqua homeowners, visit our Chappaqua appraisal page. For a comprehensive overview of the Westchester tax grievance process, see our Guide to Property Tax Grievance in Westchester County. To request a quote, visit our Tax Grievance Appraisal page.