Stone farmhouse, white Victorian with wraparound porch and two-story Colonial above farm fields and the Delaware River valley in Warren County, New Jersey

Independent, State-Certified Real Estate Appraisals

Warren 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 Warren County

Warren County has 22 municipalities along New Jersey's western edge. They range from Phillipsburg, Washington Borough, Hackettstown and Belvidere to the farms and villages of Blairstown, Hope, Knowlton, Harmony, Franklin and Hardwick, and on up to the Delaware Water Gap. The median owner-occupied home value is $323,100, and 74.3% of homes are owner-occupied (U.S. Census).

New Jersey Real Estate Appraisal Group provides state-certified appraisals for Warren 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

Warren County Tax Appeals: Ratios, Revaluation and Evidence

Every Warren County town is below 85%. In 2026, all 22 municipalities had average ratios under 85%. Washington Borough is lowest at 46.82% and Belvidere highest at 76.80% (NJ Division of Taxation — 2026 Chapter 123 ratios). When ratios are this far below market value, the ratio test can decide whether an appeal changes anything.

How the ratio test works. 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 22 towns:

MunicipalityAverage ratioCommon level range
Allamuchy54.04%45.93% – 62.15%
Alpha63.67%54.12% – 73.22%
Belvidere76.80%65.28% – 88.32%
Blairstown63.47%53.95% – 72.99%
Franklin66.51%56.53% – 76.49%
Frelinghuysen72.20%61.37% – 83.03%
Greenwich57.37%48.76% – 65.98%
Hackettstown74.38%63.22% – 85.54%
Hardwick (revaluing for 2027)52.97%45.02% – 60.92%
Harmony58.37%49.61% – 67.13%
Hope59.84%50.86% – 68.82%
Independence59.23%50.35% – 68.11%
Knowlton50.27%42.73% – 57.81%
Liberty57.50%48.88% – 66.13%
Lopatcong68.98%58.63% – 79.33%
Mansfield59.32%50.42% – 68.22%
Oxford50.85%43.22% – 58.48%
Phillipsburg52.96%45.02% – 60.90%
Pohatcong57.51%48.88% – 66.14%
Washington Borough46.82%39.80% – 53.84%
Washington Township59.38%50.47% – 68.29%
White61.82%52.55% – 71.09%
Worked example

Example, using Phillipsburg's 2026 average ratio of 52.96% (range 45.02% – 60.90%): a home is assessed at $150,000.

  • If it appraises at $280,000, the ratio is 53.6%, inside the range, so there's no change, even if the owner feels over-assessed.
  • If it appraises at $230,000, the ratio is 65.2%, above the range, so the assessment is reduced to about $121,808 ($230,000 × 52.96%).
Revaluation

Hardwick is revaluing for 2027. As directed by the Warren County Board of Taxation and the NJ Division of Taxation, Hardwick Township is revaluing all taxable property for the 2027 tax year. Appraisal Systems, Inc. is doing the work, with values as of October 1, 2026 (Hardwick revaluation letter, January 2026). Once new assessments take effect, the ratio test no longer protects over-assessed owners in the same way. The appeal comes down to whether comparable sales support the new value.

Filing, according to the state's appeal petition:

Deadlines: April 1, or 45 days after assessment notices are mailed if later. Appeals must be received, not just postmarked.
Revaluation or reassessment towns have a May 1 deadline.
Properties assessed over $1 million can also file directly with the State Tax Court.

Evidence rules, from the state's appeal petition, which applies to county board appeals:

Appraisal copies: one for the tax administrator and each board member, plus one for each opposing party, at least seven calendar days before the hearing.
The appraiser and taxpayer must appear. The appraiser must be present to testify to the report.
No more than five comparable sales go to the assessor, clerk and Board seven days ahead, if they weren't filed with the petition.
Board office

The Warren County Board of Taxation is in the Cummins Building, 202 Mansfield Street, Belvidere (908-475-6070) (NJ Division of Taxation). Its meetings are held by Zoom or at the Board's office, depending on the business (Warren County Board of Taxation). We prepare tax appeal appraisals valued as of October 1 and appear at the hearing to testify.

Estate and Date-of-Death Appraisals

Warren County estates are handled by the Warren County Surrogate at 323 Front Street, Belvidere (Warren County Surrogate). Executors often 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 Warren County Family Court

Warren County divorce matters are handled by the Family Division of the Superior Court at the Warren County Courthouse, 413 Second Street, Belvidere (Warren County). When the marital home, a farm or a rental 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.

Farms, Preserved Land and Rural Properties

Warren County has preserved some 339 farms covering more than 29,000 acres since its farmland preservation program began in 1986 (Warren County Land Preservation). That shapes the market in several ways:

Preserved farms carry permanent deed restrictions. Their value can't be compared directly with unrestricted land.
Farmland-assessed properties in Knowlton, Harmony, White, Franklin, Greenwich and Pohatcong need the house and land valued separately from the tax treatment.
Rural homes in Blairstown, Hope, Hardwick, Frelinghuysen and Liberty often have few close comparable sales. We widen the search carefully and make market-supported adjustments for acreage, outbuildings, and well and septic systems.

We also provide as-is and after-repair value (ARV) appraisals for renovation projects and for older homes in Phillipsburg, Washington Borough and Belvidere.

Housing Stock We Appraise Across Warren County

Phillipsburg, Alpha and Lopatcong

older single-family homes, two-family homes, row homes and newer developments.

Hackettstown, Mansfield, Independence and Allamuchy

Colonials, split-levels, townhouses and Panther Valley homes.

Washington Borough, Washington Township and Oxford

Victorians, capes and ranches, and suburban Colonials.

Belvidere, White, Harmony and Knowlton

historic town homes, farmhouses and river-area homes.

Blairstown, Hope, Hardwick, Frelinghuysen, Liberty, Franklin, Greenwich and Pohatcong

farms, acreage, stone farmhouses and rural homes.

Areas We Serve in Warren County

We serve all 22 Warren County municipalities:

  • Allamuchy
  • Alpha
  • Belvidere
  • Blairstown
  • Franklin
  • Frelinghuysen
  • Greenwich
  • Hackettstown
  • Hardwick
  • Harmony
  • Hope
  • Independence
  • Knowlton
  • Liberty
  • Lopatcong
  • Mansfield
  • Oxford
  • Phillipsburg
  • Pohatcong
  • Washington Borough
  • Washington Township
  • White

Other Appraisal Services in Warren County

Frequently Asked Questions – Warren County Appraisals

What is the property tax appeal deadline in Warren County?
April 1, or 45 days after assessment notices are mailed if later. Appeals must be received by the Warren County Board of Taxation, not just postmarked. In towns that implemented a revaluation or reassessment, such as Hardwick for 2027, the deadline is May 1. Properties assessed over $1 million can also file directly with the State Tax Court.
What does the Warren County Tax Board require if I use an appraisal?
Under the rules printed on the state's appeal petition, a party relying on an appraisal must give the Board a copy for the tax administrator and each board member, plus one copy to each opposing party, at least seven calendar days before the hearing. The appraiser and the taxpayer must both appear, and the appraiser must be present to testify. No more than five comparable sales may be submitted.
Is Hardwick Township being revalued?
Yes. Hardwick is revaluing all taxable property for the 2027 tax year, as directed by the Warren County Board of Taxation and the NJ Division of Taxation. Appraisal Systems, Inc. is doing the work, and new values reflect market value as of October 1, 2026. After a revaluation, an appeal depends on whether comparable sales support the new assessment.
Can you appraise farms and preserved farmland?
Yes. Warren County has preserved more than 339 farms and 29,000 acres. Deed-restricted preserved farms, farmland-assessed land, outbuildings, and well and septic systems all need careful comparable selection and adjustment. We separate the house, the land and any restrictions so the value holds up for estates, divorces and buyouts.
How long does a Warren 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. Farm, acreage, court-ready and retrospective assignments may cost more. You'll get a firm quote before scheduling.

Request a Warren 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 or May 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.