Grand Isle County, VT zoning map, flood zone and property lines by address
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Towns in Grand Isle County: North Hero.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA has 18 FIRM panels covering Grand Isle County, the newest effective December 2023; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Grand Isle house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Vermont Center for Geographic Information (VCGI), statewide standardized parcels, from each town’s grand list, so a Grand Isle lot shows the same lines the town assessor (listers) draws. Grand Isle County covers about 52,334 acres of land and 71,401 acres of water.
Mapped lines are approximate. The town listers in Grand Isle County keep the parcel record (Vermont Department of Taxes listers and assessors page); a licensed surveyor sets the true corners.
Zoning
In Vermont zoning is set by each town and city, not by the county. ParcelSheet shows the use code on the lot's parcel record and the municipality it sits in; the town zoning administrator has the district, the uses it allows and the lot size it needs. The State list lists the county's municipalities.
ADU and guest houses
Under Vermont's municipal planning and development law (Vermont Statutes Title 24, Chapter 117), each town and city can allow an accessory dwelling unit on a lot with a house. Whether a Grand Isle lot can add one depends on its district; the town zoning administrator has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Grand Isle County is soil survey area VT013, Grand Isle County, Vermont, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Grand Isle County needs a permit from the Vermont Department of Environmental Conservation (Wastewater System and Potable Water Supply Permit).
Setbacks
Setbacks in Grand Isle County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the town zoning administrator gives them for the lot's district.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Grand Isle lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Grand Isle County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA has 18 flood map panels covering Grand Isle County, the newest effective December 2023. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Grand Isle County?
Open the Vermont map, type the address, and the parcel outline from the town listers in Grand Isle County shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Grand Isle County?
Zoning in Grand Isle County is set by each town and city, not by the county. ParcelSheet shows the use code on the parcel record and names the municipality; the town zoning administrator has the final word.
Can I build an ADU in Grand Isle County?
Under Vermont's municipal planning and development law (Vermont Statutes Title 24, Chapter 117), each town and city can allow an accessory dwelling unit, and each sets its own rules. In Grand Isle County ask the town zoning administrator for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Grand Isle County?
Yes. A new or changed septic system in Grand Isle County needs a permit from the Vermont Department of Environmental Conservation (Wastewater System and Potable Water Supply Permit). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area VT013 (Grand Isle County, Vermont).
What can I build on 5 acres in Grand Isle County?
Zoning in Grand Isle County is set by each town and city, not the county. The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the town zoning administrator has the district and its rules. See the Vermont Department of Taxes listers and assessors page.
What are the residential setbacks in Grand Isle County (2026)?
Setbacks in Grand Isle County come from the zoning code of the municipality the lot sits in: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the town zoning administrator gives them for the district. See the Vermont Department of Taxes listers and assessors page.
Next to Grand Isle County: Chittenden County, Franklin County.
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