Tompkins County, New York requires building permits for work covered by the state codes, but the city, town or village where the parcel lies administers them12. Local municipalities also make zoning decisions, while Tompkins County Environmental Health permits and inspects septic systems countywide34. Ask the local code office about any owner-builder exemption because we could not confirm a general one5.
At a glance
- Building permit
- Required for covered work; administered by the local city, town or village12
- Zoning
- Varies by municipality; contact the city, town or village for the parcel2
- Septic (OWTS) permit
- Required for a new system or repairs; issued by Tompkins County Health Department36
- Owner-builder exemption
- Not confirmed for New York; ask your town's code enforcement officer5
- Minimum OWTS lot size
- At least one acre of usable land under the county sanitary code7
- Building code in effect
- NY Uniform Code and Energy Code; the 2025 edition applies to applications from December 31, 2025 on1
- Small accessory structure exemption
- Detached sheds and similar structures up to 144 sq ft are commonly exempt from a permit8
Who to call
Building permits
Town of Danby Code Enforcement Office
Building permits and code enforcement in the Town of Danby, one of Tompkins County's towns; each town in the county has its own equivalent office
1830 Danby Road, Ithaca, NY 14850
Septic permits
Tompkins County Whole Health — Environmental Health (OWTS)
Onsite wastewater treatment system (OWTS/septic) construction permits and inspections countywide in Tompkins County
Planning & zoning
Tompkins County Department of Planning and Sustainability
Countywide comprehensive planning, housing and land-conservation strategy; does not issue zoning or building permits, which stay with each town
121 E. Court Street, Ithaca, NY 14850
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 Tompkins County, New York?
Yes. Building work in Tompkins County that is covered by New York's Uniform Code or Energy Code requires a permit administered by the city, town or village with jurisdiction, rather than by a single county building department12. The Town of Danby shows how that local system works: its code office enforces local and state rules, and certain projects require a building permit9. A local code-enforcement program may exempt listed work, including a qualifying one-story detached shed, playhouse or similar accessory structure no larger than 144 square feet, but an exemption does not waive the underlying codes8. The 2025 New York codes apply to permit applications submitted beginning December 31, 20251. Danby has also adopted the NYStretch Energy Code, so confirm both statewide and local requirements with the municipality before designing the project9.
Who issues building permits in Tompkins County, and how do you reach them?
First identify the city, town or village containing the parcel, because municipalities administer building permits, code enforcement, planning and zoning in Tompkins County2. For land in Danby, the Town of Danby Code Enforcement Office can be reached at 607-277-4788 or [email protected]9. Owners elsewhere should contact their own municipality rather than treating Danby's requirements as countywide2. Tompkins County's Department of Planning and Sustainability works on the county comprehensive plan and reviews certain development applications or proposed zoning changes referred by municipalities; that county review happens before final municipal action and is not the complete local building-permit process1011. Building-permit fees also vary with the authority and project, so request the current application and fee schedule from the local code office before budgeting12.
Does Tompkins County have zoning?
Zoning and development decisions vary by municipality in Tompkins County; the county is not the administrator of every local ordinance2. The applicable city, town or village is therefore the source for a parcel's zoning district, setbacks, minimum lot size, building height, lot coverage, and rules for RVs or tiny homes2. Tompkins County does review certain municipal development applications and proposed zoning changes under the referral process, but final action remains municipal and that review is not a substitute for the local ordinance11. Subdivision review can also depend on local authorization: where a town board empowers its planning board, state law supplies hearing, decision and filing procedures13. Before making an offer, ask the local zoning or code office for written confirmation of the parcel's district and whether the intended residence and accessory uses are allowed.
How do septic (OWTS) permits work in Tompkins County?
Tompkins County Health Department issues the construction permit for a new onsite wastewater treatment system and for repairs to an existing system36. The process includes an application and fee, a coordinated site and soil investigation, construction to the issued permit, and county inspection6. The system must remain uncovered for final inspection, and the Health Department requires at least 24 hours' notice for that appointment4. The county office often designs the system during permitting, and a permit is also required to install or replace a septic tank, pump chamber or holding tank7. A lot generally needs at least one acre of usable area that can contain a 150-foot-diameter circle, although qualifying older lots of at least 30,000 square feet may be considered7. Only about 3.7% of county soils are rated without severe limitations for a conventional drain field, making the site investigation a crucial pre-purchase step14.
Can you live in an RV or tiny home on your land in Tompkins County?
We could not confirm a countywide rule allowing long-term RV occupancy, temporary camping or tiny-home occupancy in Tompkins County. Land-use decisions vary by municipality, so ask the city, town or village where the parcel lies whether the proposed use is allowed in that zoning district2. New York's possible permit exemption for a qualifying detached accessory structure no larger than 144 square feet applies to sheds, playhouses and similar uses; it does not establish permission to occupy a small structure as a home8. We also could not confirm a general owner-builder exemption for ordinary residential work, so ask the same local code office who may perform the work and which inspections apply5. If the property lacks sewer service, confirm an approvable septic plan with Tompkins County Environmental Health rather than assuming an alternative off-grid sanitation system is allowed6.
Building a home in Tompkins County: the steps, in order
- Identify the city, town or village containing the parcel, then confirm the zoning district, proposed use and local application requirements with its code office2.
- If the site lacks municipal sewer, apply to Tompkins County Health Department and coordinate its site and soil investigation before finalizing the house location6.
- Check the local flood map and ordinance; development in a mapped flood zone needs a separate municipal floodplain development permit in addition to other permits15.
- Submit the local building-permit application with the site, scope, occupancy and construction documents required by the code-enforcement program16.
- Build to the issued permits, keep covered work accessible, and schedule required construction inspections with the local authority17.
- Leave the septic installation uncovered and give the Health Department at least 24 hours' notice for final inspection4.
- Obtain a certificate of occupancy or compliance from the local authority before using work that required a building permit18.
What to check before you buy land in Tompkins County
Confirm the parcel's municipality before relying on zoning, permit or fee information, because those decisions are administered locally2. Check septic feasibility before closing: only about 3.7% of Tompkins County soils are rated without severe limits for a conventional drain field, while the county generally requires at least one acre of usable land shaped to fit a 150-foot-diameter circle147. Check mapped flood status too, because grading, filling, paving, excavation, buildings and other development in a flood zone require a separate permit from the applicable municipality15. About 82% of county land has a slope of 15% or less, and about 64.4% is wooded; parcel-level topography, clearing and access still need inspection1920. We could not confirm a countywide private-well or driveway-access rule, so ask the municipality and the road authority serving the parcel. Finally, budget for an effective property-tax rate of about 2.3% and a median annual property-tax bill near $6,3742122.
Watch-outs
- Building permits and zoning decisions in Tompkins County are administered by the applicable city, town or village, so confirm the parcel's municipality before applying2.
- Only about 3.7% of Tompkins County soils are rated without severe limits for a conventional drain field, and the county generally requires at least one acre of properly shaped usable land for an OWTS permit147.
- Development in a mapped flood zone requires a separate floodplain development permit from the applicable municipality, even when other permits are already required15.
Sources
- Notice of Adoption, quoted and re-checked
- Community Planning, quoted and re-checked
- Procedure for Obtaining a Permit to Construct an OWTS, quoted and re-checked
- Procedure for Obtaining a Permit to Construct an OWTS, quoted and re-checked
- (2026 county census)
- Procedure for Obtaining a Permit to Construct an OWTS, quoted and re-checked
- Tompkins County Whole Health — Environmental Health (OWTS) (tompkinscountyny.gov)
- Part 1203 Uniform Code and the Energy Code: Minimum Standards for Administration and Enforcement (New York statewide rule), quoted and re-checked
- Town of Danby Code Enforcement Office (danby.ny.gov)
- Tompkins County Department of Planning and Sustainability (tompkinscountyny.gov)
- Community Planning, quoted and re-checked
- Department of State Administration and Enforcement Fee Schedule (New York statewide rule), quoted and re-checked
- New York Town Law § 276: Subdivision review; approval of plats; development of filed plats (New York statewide rule), quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- FEMA and DEC Flood Map Update FAQs, quoted and re-checked
- Administration and Enforcement of the Uniform Code (New York statewide rule), quoted and re-checked
- Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code, quoted and re-checked
- Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code, quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
- Wooded share of land: 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.