Long Island, New York
Selling a home in Suffolk County
From Huntington's harbors to the East End farms and beaches, Suffolk's ten towns each assess, zone and permit on their own.
Get my free home valueAbout Suffolk County
Ten towns, two forks and a lot of septic tanks
Suffolk County, east of Nassau, had 1,525,920 residents in the 2020 Census. It is divided into ten towns: Babylon, Brookhaven, East Hampton, Huntington, Islip, Riverhead, Shelter Island, Smithtown, Southampton and Southold, with incorporated villages inside many of them. The island splits into the North Fork and South Fork at the east end, with Shelter Island between. Each town has its own assessor, zoning code and building department.
The LIRR reaches Suffolk on the Babylon, Ronkonkoma, Port Jefferson and Montauk lines. The North Shore has harbors and hills on Long Island Sound. The South Shore faces the Great South Bay and the Fire Island barrier beach. Water quality is a big local topic: the county says nearly 70 percent of Suffolk homes use cesspools or septic systems.
Seller guides in Suffolk County
Homes in Suffolk County
What sellers should know
Housing ranges from postwar ranches and capes in the western towns to colonials on the North Shore and summer cottages, farmhouses and large estates on the East End. Because most homes are not on sewers, the cesspool or septic system is part of every inspection. Buyers on the bays and barrier beaches will also ask about flood zones and flood insurance. Have your permits, certificates of occupancy and any septic pump-out records together before you list.
Know your town assessor
In Suffolk each town assesses property, not the county. Your town assessor is the office for your assessed value, exemptions and grievances.
Gather septic records
Nearly 70 percent of Suffolk homes use cesspools or septic systems. Pump-out receipts and any upgrade approvals from the County Department of Health Services help buyers relax.
Look into nitrogen-reducing systems
The county's Septic Improvement Program offers grants toward Innovative/Alternative (I/A) systems, which need approval from the Health Department's Office of Wastewater Management.
Plan for the East End transfer tax
Sales in the five Peconic Bay Region towns, East Hampton, Riverhead, Shelter Island, Southampton and Southold, carry a Community Preservation Fund transfer tax filed with the deed. The town of Southold notes it is paid by the buyer, but your attorney should confirm the details for your sale.
For landowners
Building on your land in Suffolk County
In Suffolk, what you can build is set by each town's or village's zoning code and building department, and the Suffolk County Department of Health Services reviews water supply and sewage disposal for new homes and many additions. On the East End and near the shore, wetland and coastal rules can apply too. We point you to the right office; we do not promise what a lot allows.
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Selling a home in Suffolk County: questions
When can I grieve my assessment in Suffolk?
New York State says that in Suffolk County the town Board of Assessment Review meets on the third Tuesday in May. File your complaint with your town assessor by then. Villages that assess their own property set their own dates.
Who handles deeds and records in Suffolk?
Deeds are recorded with the Suffolk County Clerk. The Clerk's online records cover land records imaged from 1987 to the present, which helps you confirm the exact name and lot on your deed before you sign.
Do I have to replace my cesspool to sell?
A sale alone does not usually trigger a septic upgrade, but buyers and their inspectors look hard at the system. Major new construction or a big expansion can require an Innovative/Alternative system under health department and local rules, so check before you promise a buyer anything.
Official sources for Suffolk County sellers
- Suffolk County Real Property Tax Service Agency: FAQs
- Suffolk County Septic Improvement Program
- NYS Tax Department: Grievance procedures and dates
- Suffolk County Clerk: Online Records
- Suffolk County Clerk: Peconic Bay Region CPF form (lists the five towns)