Stone Colonial, white farmhouse-style Colonial and brick Georgian homes on a tree-lined street in Mercer County, New Jersey

Independent, State-Certified Real Estate Appraisals

Mercer County Real Estate Appraisal Services

Clear, well-supported valuations for legal, financial and personal real estate decisions.

Tell Us What You Need Appraised Call 908-517-3913

Appraisal Services Across Mercer County

Mercer County has 12 municipalities (Mercer County). They range from the state capital of Trenton to Princeton, the commuter suburbs of West Windsor, Robbinsville and Lawrence, Hamilton Township, and the farms and preserved land of Hopewell Township. The median owner-occupied home value is $351,000, and 61.9% of homes are owner-occupied (U.S. Census). Values vary widely from one Mercer town and neighborhood to the next, so comparable selection matters.

New Jersey Real Estate Appraisal Group provides state-certified appraisals for Mercer County homeowners, attorneys, executors, accountants and investors. Every report follows USPAP and is written to hold up when it’s challenged, whether by opposing counsel, the County Board of Taxation, the IRS or a lender’s review appraiser.

  • State-certified, 26 years in New JerseyIndependent, USPAP-compliant reports
  • Divorce, estate and tax appeal specialistsIncluding past-date (retrospective) values
  • Court-ready, defensible reportsExpert testimony available when needed
  • Firm quote, 5–7 business daysMost assignments $495–$750

Mercer County Tax Appeals: Ratios, Deadlines and Evidence

Assessments in Mercer's towns range from about 54% to 74% of market value. In an appeal, the Board divides your assessment by your property's market value and compares the result with your town's common level range, which is the average ratio plus or minus 15%. If your ratio is above the upper limit, the assessment is reduced by applying the average ratio to your market value (NJ Division of Taxation).

2026 average ratios and common level ranges for all 12 towns (NJ Division of Taxation — 2026 Chapter 123 ratios):

MunicipalityAverage ratioCommon level range
East Windsor56.62%48.13% – 65.11%
Ewing63.20%53.72% – 72.68%
Hamilton61.32%52.12% – 70.52%
Hightstown55.40%47.09% – 63.71%
Hopewell Borough71.76%61.00% – 82.52%
Hopewell Township71.31%60.61% – 82.01%
Lawrence73.80%62.73% – 84.87%
Pennington70.11%59.59% – 80.63%
Princeton62.64%53.24% – 72.04%
Robbinsville62.01%52.71% – 71.31%
Trenton53.53%45.50% – 61.56%
West Windsor63.45%53.93% – 72.97%
Worked example

Example, using Hamilton's 2026 average ratio of 61.32% (range 52.12% – 70.52%): a home is assessed at $250,000.

  • If it appraises at $400,000, the ratio is 62.5%, inside the range, so there's no change, even if the owner feels over-assessed.
  • If it appraises at $340,000, the ratio is 73.5%, above the range, so the assessment is reduced to about $208,488 ($340,000 × 61.32%).

The appraised value decides the case, so it has to be well supported. No Mercer County town implemented a revaluation or reassessment for 2026 (NJ Division of Taxation — 2026 list).

Princeton is different. Princeton hasn't had a full revaluation since 2010. Instead, it runs a yearly Compliance Plan: the assessor compares sales with assessments in more than 100 neighborhoods and adjusts about 1,000 of the town's more than 8,100 assessments each year, up or down. Changes appear on the green postcards mailed each February, and the Mercer County Tax Board must approve them (Princeton). Because the adjustments are neighborhood-wide, they can miss what's specific to your house, such as condition, a busy road, a small or steep lot, or a dated interior. We document those differences for the hearing.

Deadlines: April 1, or 45 days after assessment notices are mailed if later, and May 1 in a revaluation or reassessment year. Added and omitted assessments are due December 1. Appeals must be received, not merely postmarked (Mercer County Board of Taxation). Properties assessed over $1 million can also appeal directly to the State Tax Court (NJ Division of Taxation).

According to the Board's appeal brochure:

Value is set as of October 1 of the pre-tax year. Comparable sales used as proof must have closed on or before that date. Later sales can only support the value.
Attach 3 to 5 comparable sales to all copies of your appeal when you file.
Evidence is due at least seven days before the hearing, to the assessor and to the Board (5 copies).
If you use an appraisal, the appraiser must be available at the hearing to testify.
Adjournments are generally denied. A missed hearing is dismissed for lack of prosecution and can't be appealed to the Tax Court.

The Board is at 640 South Broad Street, Room 317, Trenton, and doesn't accept faxed or emailed appeals (Mercer County Board of Taxation). We prepare tax appeal appraisals valued as of the correct date and attend the hearing to testify.

Estate and Date-of-Death Appraisals

Mercer County estates are handled by the Mercer County Surrogate at the Civil Courthouse, 175 South Broad Street, 4th Floor, Room 420, Trenton (Mercer County Surrogate). Executors usually need a date-of-death value for three reasons: to report stepped-up basis to the IRS, to divide property fairly among heirs, and to support a sale or buyout.

Our estate and date-of-death appraisals are retrospective. We value the property as it stood on the date of death, using sales from that period rather than today's market.

Divorce Appraisals for Mercer County Family Court

Mercer County divorce matters are handled by the Family Division at the Mercer County Civil Courthouse, 175 South Broad Street, Trenton (NJ Courts). When the marital home is part of equitable distribution, both sides and the court need a value that is neutral and defensible.

We provide court-ready divorce appraisals. That includes retrospective values as of the date of filing or separation, joint engagements where both spouses agree on one appraiser, and inspections coordinated through counsel when the spouses can't be present together.

Princeton Homes, Trenton Multi-Family and Hopewell Land

Three parts of the Mercer County market need more than a standard approach:

Princeton and nearby high-value homes. Historic homes near the university, custom homes on large lots and newer infill construction. Comparable sales vary widely by street and school, and dated homes often sell for land value.
Trenton row homes and two- to four-family properties. Buyers look at rent as well as the house, so we check rents and, when it helps, a gross rent multiplier alongside comparable sales. Condition varies a lot from block to block, and we inspect for it.
Hopewell Township, Pennington and farmland. Acreage, preserved farmland, horse properties and older farmhouses, where zoning, deed restrictions and usable land drive value.

Parts of Trenton, Hamilton and Ewing near the Delaware River and Assunpink Creek are flood-prone. At major flood stage on the Assunpink in Trenton, the National Weather Service lists impacts including flooding of the Trenton Transit Center (NOAA). Flood zone, flood history and insurance cost all affect value.

We also provide as-is and after-repair value (ARV) appraisals for renovation projects.

Housing Stock We Appraise Across Mercer County

Princeton

Colonials, Victorians, stone and stucco houses, mid-century moderns, condos and custom homes.

West Windsor, Robbinsville and East Windsor

newer Colonials, townhouse communities, age-restricted communities and condos.

Hamilton, Ewing and Lawrence

Cape Cods, ranches, split-levels, Colonials and townhouses.

Hopewell Township, Hopewell Borough and Pennington

farmhouses, custom homes on acreage and historic village homes.

Trenton and Hightstown

row homes, twins, two- to four-family houses, older single-family homes and small apartment buildings.

Areas We Serve in Mercer County

We serve all 12 Mercer County municipalities:

  • East Windsor
  • Ewing
  • Hamilton
  • Hightstown
  • Hopewell Borough
  • Hopewell Township
  • Lawrence
  • Pennington
  • Princeton
  • Robbinsville
  • Trenton
  • West Windsor

Other Appraisal Services in Mercer County

Frequently Asked Questions – Mercer County Appraisals

What is the property tax appeal deadline in Mercer County?
April 1, or 45 days after assessment notices are mailed if that is later, and May 1 in a town that implemented a revaluation or reassessment. Added or omitted assessments are due December 1. The Mercer County Board of Taxation must receive the appeal by the deadline, since a postmark isn't enough. The Board doesn't accept faxed or emailed appeals.
My Princeton assessment went up on the February postcard. Can I appeal?
Yes. Princeton adjusts about 1,000 of its more than 8,100 assessments each year under its Compliance Plan, using neighborhood sales trends. Those are neighborhood-wide changes, so they may not fit your property's condition, size or location. If your assessment increased, or you believe it's above market value, you can appeal by April 1. An appraisal as of October 1 of the prior year shows the Board what your home is actually worth.
Does the appraiser have to testify at a Mercer County tax appeal hearing?
Yes. The Mercer County Board of Taxation's appeal brochure says that if you use an appraisal, the appraiser must be available at the hearing to testify. Any evidence to be discussed must reach the assessor, and the Board in 5 copies, at least seven days before the hearing. Adjournments are generally denied, and a missed hearing is dismissed for lack of prosecution.
Can you value a Mercer County property as of a past date for an estate or divorce?
Yes. Retrospective appraisals value a property as of the date of death, date of separation or date of filing. We use sales and market conditions from that period, not today's market, and document how the effective date affected the analysis.
How long does a Mercer County appraisal take and what does it cost?
Most reports are delivered in 5 to 7 business days after the inspection. Typical fees are $495 to $750, depending on property type, complexity and purpose. Luxury, acreage, multi-family, court-ready and retrospective assignments may cost more. You'll get a firm quote before scheduling.

Request a Mercer County Appraisal

Call 908-517-3913, email [email protected], or request a quote online. Tell us the property address, the purpose of the appraisal and any deadline, whether that's an April 1 tax appeal, a court date or an estate filing. We'll confirm the fee and schedule before we begin.

Request Your Appraisal Today

Call us at (908) 517-3913

We serve clients and attorneys throughout New Jersey, with court-ready real estate valuations you can trust.

Certified Real Estate Appraisers Serving All 21 New Jersey Counties

New Jersey Real Estate Appraisal Group provides independent, state-certified real estate appraisal services throughout all 21 New Jersey counties. Whether you want to know how much your home is worth, need an appraisal for a sale or financial decision, or require a valuation for divorce, estate settlement, immigration, property tax appeal, or another legal matter, we're here to help.

Anyone can give you a number. What matters is the methodology, market evidence, and professional judgment behind that number — especially when important decisions depend on it.

Copyright © 2026 NJREAG - All Rights Reserved.

Copyright © 2026 NJREAG - All Rights Reserved.