Nassau County, NY
Nassau reassesses every year, and every homeowner can challenge the county’s valuation of their own home. Check your address to see the nearby home prices and what a reduction could be worth.
Free to check. $0 upfront · $249 maximum fee · $0 if no reduction.
Current filing information
Dates are for the 2028/29 roll and were last checked on 2026-08-31. Confirm them against the county’s published information before relying on them.
How it works here
Your assessment decides the share of the school and town levies your property carries. If the county values your home above what comparable homes support, you are carrying more of that share than you should. A grievance asks the Assessment Review Commission to correct the valuation.
It is decided on the papers rather than at a hearing, the Assessment Review Commission will not increase your assessment as a result of it, and you can file it yourself, free, if you would rather. A reduced assessment lowers the share you carry — it does not by itself guarantee a lower bill, which also depends on rates, exemptions and district budgets.
Towns we cover
We work across the county. These are the towns with a page of their own so far.
Levittown
11756
Garden City
11530
Massapequa
11758 · 11762
Hicksville
11801
Freeport
11520
Valley Stream
11580 · 11581 · 11582
Oyster Bay
11771
Hempstead
11550 · 11552 · 11553
Not listed? We still cover it — check any Nassau address above. Already using another firm? Read this first.