Building permits, zoning and septic rules in Ulster County, New York

Yes. Work that must conform to New York's Uniform Code or Energy Code requires a building permit in Ulster County⁴. Building permit applications submitted since the 2025 Uniform Code took effect on December 31, 2025 must comply with it⁹. Installation, alteration and repair of a manufactured home require a permit when the work is covered by the Uniform Code¹⁰. Site work on a manufactured home is inspected for code compliance, and permitted work requires a certificate of occupancy or compliance¹⁰. An owner-occupant installing a manufactured home may apply for installer certification, but required work completed by the owner must be supervised and certified by a qualified installer¹⁰. That narrow option does not establish a general owner-builder exemption from permits; we could not confirm one for Ulster County.

Start with the code enforcement officer for the town or village containing the parcel because local governments ordinarily administer New York's statewide building code¹. The Ulster County Environmental Sanitation Division issues building permits only in properly opted-out localities¹. We could not confirm a current list of those localities, so ask the town first whether it runs its own program. For a county-issued permit, the owner or authorized agent applies in writing with the property, work, occupancy and code-compliance information, and pays the fee at submission¹. That work must remain accessible until the county's inspections are accepted¹. County fees follow a schedule that can change; request the current schedule from the Environmental Sanitation Division¹.

New York gives general zoning power to cities, towns and villages rather than counties, so the parcel's municipality—not Ulster County zoning—controls land use⁵. Zoning varies across Ulster County's town, city and village jurisdictions². The Town of Ulster, for example, has its own use table and district-specific requirements⁷. In that town, minimum lot size, setbacks, maximum lot coverage and maximum height depend on the parcel's district⁷. Certain dwellings in the Town of Ulster Redevelopment Overlay District have stated minimum floor areas, but those overlay standards are not a countywide minimum-home-size rule⁷. Check the actual municipal zoning map and district table rather than borrowing standards from a neighboring town.

The Ulster County Department of Health reviews and approves plans for residential, commercial and small community wastewater systems³. An onsite system application requires design drawings, and at least two copies must be submitted before the county issues a construction permit⁶. Schedule the county-witnessed soil-profile excavation early⁶. Review can take up to 6 months for smaller residential properties, depending on county and design-professional workload⁶. During construction, county field representatives verify the approved design, and a professional engineer certifies completion⁶. No county soils are rated without severe limitations for a conventional drain field, so make septic feasibility a purchase contingency¹¹. Realty subdivisions also require county sanitary-facilities review³.

There is no confirmed countywide answer for living in an RV or tiny home; ask the parcel's town code enforcement office because zoning is municipal⁵. The Town of Ulster provides a useful but strictly local example: an RV in a residential district cannot occupy the required front setback, must generally remain at least 10 feet from side or rear property lines unless screened, and may be occupied only temporarily when sanitary facilities are available⁷. The Town of Ulster also requires separate permits to place a manufactured home on a private lot or establish a manufactured-home park⁷. A tiny home used as a single dwelling must be built to the Residential Code of New York State and its tiny-house appendix to escape the Property Maintenance Code's minimum occupancy-area rules, and that exception does not waive construction, permit, zoning or wastewater requirements⁸. Building permits for a tiny home are required for construction or relocation work that must conform to the Uniform Code, from the town or, in an opted-out locality, the county¹. Local zoning and septic requirements still apply^1,4.

1. Identify the parcel's town, city or village and zoning district because municipal zoning controls use and siting².
2. Read that district's use and bulk tables; the Town of Ulster is one local example with district-specific requirements⁷.
3. Confirm the building-permit authority with the local code enforcement officer; the county handles only properly opted-out localities¹.
4. If an onsite wastewater system is needed, begin county Health Department plan review and permitting^3,6.
5. Obtain septic approval before the building permit because most towns require approved plans first³.
6. Apply to the correct code office and complete the required inspections⁴.
7. Obtain the certificate of occupancy or compliance before moving in⁴.

Confirm the municipality and zoning district first because use and bulk rules are local⁵. Make septic feasibility a contract contingency: no county soils are rated without severe limitations for a conventional drain field¹¹. Check legal road access too; the Town of Ulster requires a separate permit for a street excavation or driveway curb cut, although other municipalities may differ⁷. In the Town of Ulster, flood-hazard uses must also comply with the town's Flood Damage Prevention Local Law⁷. A subdivision needs local planning-board approval before county filing, and sanitary facilities receive county review^3,12. We could not confirm a standalone countywide private-well permit rule, so ask the county Health Department before drilling.