Check the assessment
See whether the County's value appears high.
Built for Nassau County
Stronger appeals start with better evidence.
FairValue reviews assessment records, comparable sales, and neighborhood equity patterns to help homeowners decide whether to file.
Understand the evidence
Review comparable sales and similar-property assessment patterns.
Choose how to file
File yourself, use flat-fee support, or choose full-service representation.
A new assessment roll is issued each year.
A previous reduction does not guarantee that the next assessment will remain fair.
Learn why annual review mattersEvidence report preview
See the evidence behind the recommendation.
FairValue turns property data, comparable sales, and assessment history into a filing-ready evidence pack.
2027 appeal evidence preview
Local Nassau coverage
See Recent Results Near You
Browse recent assessment reductions by city or school district.
City
Average assessment cut
Frequently asked questions
These are the questions Nassau homeowners usually ask before deciding whether to file a grievance.
Can filing increase my assessment?+
No. In Nassau County, the Assessment Review Commission cannot increase your assessment because you filed a grievance. The result is either a reduction or no change.
Do I need a lawyer?+
No. Homeowners can file through Nassau County ARC themselves. FairValue offers self-file, flat-fee filing support, and full-service representation options.
What evidence is included?+
FairValue organizes comparable sales, similar-home assessment equity, recorded property characteristics, and homeowner-documented condition issues into a filing-ready analysis.
When is the filing deadline?+
The 2027 filing window begins when the tentative roll is published on January 4, 2027. The current deadline display is Not yet announced.