Building permits are required in St. Lawrence County, New York for work covered by the state Uniform Code, and the applicable town, village or city administers them rather than the county1. Zoning and subdivision rules also vary by municipality, with additional Adirondack Park controls in part of the county2. The county Public Health Department issues no permits or licenses as of January 2026, so confirm the septic approval path with the local code office before designing a system3.
At a glance
- Building permit
- Required for work covered by the state Uniform Code; apply through the local authority1
- Zoning
- Varies by town, village or city; confirm the parcel's zoning district locally24
- Septic/sewage oversight
- As of January 2026, county Public Health issues no septic permits; enforcement defers to your town and NYS DEC3
- Adirondack Park land
- Towns in the southeastern part of the county follow the state Adirondack Park Agency's land-use plan5
- Building inspections
- Required for permitted work, performed by the local code enforcement office6
- Certificate of occupancy
- Required for permitted work and changes in use or occupancy classification7
Who to call
Also useful
St. Lawrence County Land Use and Regulations (County Planning Board overview)
Publishes the county's overview of land-use authority: which municipalities have zoning and subdivision regulations, where the Adirondack Park Agency's state land-use plan applies instead, and how the County Planning Board reviews projects with cross-jurisdiction impact
48 Court Street, Canton, New York 13617-1169
Planning & zoning
St. Lawrence County Planning Department
Provides technical planning assistance to towns and villages, publishes the county's comprehensive land use plan, and reviews certain local projects for county or state impact; does not itself adopt zoning or issue building permits
80 State Higway 310, Canton, New York 13617
Health department
St. Lawrence County Public Health Department - Environmental Health
Provides environmental health education and technical assistance (water quality, sewage nuisances, well water) and investigates public health nuisance complaints for St. Lawrence County
80 St. Hwy 310, Suite 2, Canton, New York 13617-1476
Septic permits
St. Lawrence County Public Health Department Sanitary Code Summary
The county's own current summary (dated January 2026) of its Sanitary Code: explains that St. Lawrence County Public Health issues no permits or licenses itself and that sewage-system enforcement defers to municipal code enforcement officials and NYS DEC
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in St. Lawrence County, New York?
Yes. In St. Lawrence County, work that must conform to the New York State Uniform Code or Energy Code requires a building permit from the applicable local authority1. Applications must identify the location and scope of work, tax-map number, address and occupancy classification and include the applicable construction documents1. A local authority may exempt limited categories of work, including some one-story detached sheds of 144 square feet or less associated with a one- or two-family home, but exempt work must still comply with the codes8. Building-permit applications submitted now must comply with the 2025 Uniform Code and 2025 New York State code books9. Ask the code enforcement office for the parcel's town, village or city which exemptions it has adopted before starting even a small project.
Who issues building permits in St. Lawrence County, and how do you reach them?
The code enforcement office for the parcel's town, village or city administers the state code, accepts the building-permit application and arranges required inspections16. If you are unsure which municipality covers a parcel, the St. Lawrence County Planning Department can help identify it and explain the county planning role, but it does not issue the local building permit10. Reach the Planning Department at 80 State Higway 310, Canton, New York 13617, phone 315-379-229210. Certain projects with wider county, state or cross-boundary effects may also be referred to the County Planning Board; nearly 90% of projects it reviews are returned quickly for local action5. Permit fees are set through the relevant authority, so ask the local code office for its current application and fee schedule.
Does St. Lawrence County have zoning?
St. Lawrence County does not supply one zoning answer for every parcel. Land-use authority rests primarily with its towns, villages and the City of Ogdensburg, and 40 of the county's 47 municipalities have adopted some type of land-use management practice2. The county publishes zoning maps for multiple municipalities, but a map's current coverage and district rules must be confirmed with the relevant town, village or city4. Subdivision is also local: 26 municipalities enforce subdivision regulations, and qualifying proposals may be referred to the County Planning Board11. Inside the Adirondack Park, state land-use controls add another layer2. Ask the municipal zoning or code office about setbacks, minimum lot and home size, accessory dwellings and allowed uses for the exact parcel.
How do septic permits work in St. Lawrence County?
New York State exempts a septic system discharging less than 1,000 gallons per day of ordinary sewage to groundwater from the state's SPDES discharge permit, but that exemption alone doesn't clear a system for construction: approval can still come from a city, county or district health authority depending on where the property sits1213. In St. Lawrence County specifically, the county's own current Sanitary Code Summary says the county is a "partial-service county with a sanitarian position" and that, as of January 2026, no permits or licenses are issued by the county Public Health Department at all3. Instead, the code puts responsibility on the property owner to keep a sewage system operating safely and nuisance-free, with jurisdictional deference to municipal code enforcement officials and the New York State Department of Environmental Conservation, and the county's sanitarian can run a dye test if seepage from an existing system is suspected3. Practically, that means you should ask your specific town or village code enforcement office, not the county, who signs off on a new septic system before you design one3. Separately, the county's Environmental Health office offers water-quality and well-water guidance even though it isn't the septic permitting authority14.
Can you live in an RV or tiny home on your land in St. Lawrence County?
We could not confirm one countywide rule allowing long-term RV occupancy, temporary camping or tiny-home occupancy in St. Lawrence County. Those uses depend on the zoning and land-use rules of the parcel's town, village or city, and local practices vary across the county2. A tiny home used as a dwelling must also follow the state building-permit and code framework when its construction or placement is covered by the Uniform Code1. Parcels inside the Adirondack Park face an additional state land-use layer2. Before buying or placing a unit, ask the local code office whether the zoning district permits the use, whether temporary occupancy during construction is allowed, and what septic approval is required.
Building a home in St. Lawrence County: the steps, in order
- Identify the parcel's town, village or city, zoning district and Adirondack Park status; those determine which local and state land-use controls apply24.
- If land will be divided, ask whether municipal subdivision approval and County Planning Board referral are required before treating a proposed lot as buildable11.
- Ask the local code office for its permit application, adopted exemptions and fees; the application must cover the work location and scope, tax-map number, address, occupancy classification and applicable plans1.
- Confirm the septic approval path with the local code office because St. Lawrence County Public Health issues no permits or licenses as of January 20263.
- Keep permitted work accessible for required construction inspections6.
- Obtain a certificate of occupancy or compliance after inspection and before using the completed permitted work; the same requirement covers a change in use or occupancy classification7.
What to check before you buy land in St. Lawrence County
Septic and soil: with only about 1.1% of St. Lawrence County's soils rating better than "very limited" for a conventional septic drain field, and with the county itself issuing no septic permits, get in writing, from the specific town or village, who will actually review a new system before you count on a standard drain field153. Terrain: about 84.3% of the county's land sits at a 15% slope or gentler, so most parcels are workable even though the county is heavily wooded, at roughly 74.6% forest cover1617. Adirondack Park: check whether the parcel falls in the southeastern part of the county, where the state Adirondack Park Agency's land-use plan applies on top of, or instead of, local zoning5. Agriculture: the county has had active New York State agricultural districts since 1978, which can protect farmland from restrictive zoning and certain tax assessments, so ask whether the parcel sits in one of the county's seven districts5. Location: St. Lawrence County is anchored by Canton, its county seat, and the nearest city of 100,000 or more people is about 118 miles from the county's center, making this one of the more remote counties in the state18. Taxes: the county's effective property tax rate runs around 2.3%, with a median property tax bill near $2,735 a year1920.
Watch-outs
- St. Lawrence County's own current Sanitary Code Summary (dated January 2026) says the county Public Health Department issues no permits or licenses at all, which conflicts with a common assumption that the county health department signs off on new septic systems; confirm the real approval path with your specific town or village3.
- Land in the southeastern part of St. Lawrence County falls inside the Adirondack Park, where the state Adirondack Park Agency's land-use plan can override or add to a town's own zoning, so confirm Park status before you assume a town's rules are the whole picture5.
- Land-use practices vary among St. Lawrence County municipalities, and published county zoning maps do not replace confirmation from the town, village or city responsible for the parcel24.
Sources
- Administration and Enforcement of the Uniform Code, quoted and re-checked
- St. Lawrence County Land Use and Regulations, quoted and re-checked
- St. Lawrence County Public Health Department Sanitary Code Summary (stlawco.gov)
- County Town and Village Zoning Maps, quoted and re-checked
- St. Lawrence County Land Use and Regulations (County Planning Board overview) (stlawco.gov)
- Part 1203 Uniform Code and the Energy Code: Minimum Standards for Administration and Enforcement (New York statewide rule), quoted and re-checked
- Administration and Enforcement of the Uniform Code, quoted and re-checked
- Part 1203 Uniform Code and the Energy Code: Minimum Standards for Administration and Enforcement (New York statewide rule), quoted and re-checked
- Notice of Adoption, quoted and re-checked
- St. Lawrence County Planning Department (stlawco.gov)
- St. Lawrence County Land Use and Regulations, quoted and re-checked
- State Pollutant Discharge Elimination System (SPDES) Permit Program (New York statewide rule), quoted and re-checked
- State Pollutant Discharge Elimination System (SPDES) Permit Program (New York statewide rule), quoted and re-checked
- St. Lawrence County Public Health Department - Environmental Health (stlawco.gov)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Share of land at 15% slope or less: Bolthole Index county data
- Wooded share of land: Bolthole Index county data
- Distance to the nearest metro area: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.