In Putnam County, New York, building permits come from the building department of the town or village where the parcel sits, under the statewide Uniform Code1,2. Zoning is also local, because Putnam County has no countywide zoning code3. Septic and private-well permits for every address, town or village alike, come from the Putnam County Department of Health, sometimes with joint NYC DEP review4.
Do you need a building permit in Putnam County, New York?
Work in Putnam County, New York that must conform to the statewide Uniform Code requires a building permit, with permitted exceptions under the local enforcement program.
Work in Putnam County, New York that must conform to the statewide Uniform Code requires a building permit, with permitted exceptions under the local enforcement program1. The 2025 Uniform Code is now effective in Putnam County7. A qualifying detached structure no larger than 144 square feet may be exempted by the local program, but exempt work must still comply with the Uniform Code and Energy Code5. Required inspections include foundations, slabs, framing, building systems and final inspection where applicable; keep work accessible and exposed until accepted5. Permit work and changes in general occupancy classification require a certificate of occupancy or compliance1. Carmel requires occupancy certificates for completed structures except detached tool sheds and structures built before 1955; wood stoves, fireplaces, generators, HVAC and oil tanks require compliance certificates instead8.
Who issues building permits in Putnam County, and how do you reach them?
The applicable local government generally administers and enforces the Uniform Code in Putnam County; county or state enforcement applies only in specified opt-out circumstances.
The applicable local government generally administers and enforces the Uniform Code in Putnam County; county or state enforcement applies only in specified opt-out circumstances2. Start with the building department for the town or village where the parcel lies because local zoning rules and procedures vary across Putnam County3. A permit application must describe the location, scope and occupancy and include acceptable construction documents; site, structural, building-system, energy and flood information may also be required5. For a Carmel parcel, the Town of Carmel Building Department is at 60 McAlpin Avenue, Mahopac, NY 10541, and the phone number is 845-628-15008. Carmel conducts inspections Monday through Friday from 9:30 am to 1 pm and asks for 2 to 3 days of advance notice8. Whichever town or village issues the building permit, septic and well permits stay with Putnam County Health4.
Does Putnam County have zoning?
Putnam County does not administer a countywide zoning code; towns and villages regulate zoning within their jurisdictions.
Putnam County does not administer a countywide zoning code; towns and villages regulate zoning within their jurisdictions3. Municipal zoning leaves septic and well review with Putnam County Health4. Municipalities take final action after any required County Planning referral and recommendation3. Carmel publishes a zoning map and district schedule that controls buildings, structures and lots, including district-specific yards9. Carmel’s SMR multifamily dwellings need at least 650 square feet of habitable area9. In Carmel’s HMC district, multifamily dwellings need 650 square feet and single-family attached dwellings need 1,200 square feet; special-use approval and public water and sewer service are also required10. The Carmel Planning Board reviews subdivisions, while applicable county health subdivision review remains a separate requirement4,8.
How do septic and well permits work in Putnam County?
Putnam County Health receives septic applications and determines whether watershed projects require joint NYC DEP review.
Putnam County Health receives septic applications and determines whether watershed projects require joint NYC DEP review4. New systems and repairs require county approval; routine pumping, snaking, line cleaning and sewage-pump replacement do not require prior approval4. Soil test pits or percolation tests for repairs must be witnessed by county engineering staff, and approved repairs must be inspected before backfilling11. New construction on vacant land requires professional design; county health construction permits last 2 years and may be renewed4. The septic repair permit costs $150, payable by bank or certified check, and Health Department review of house-addition floor plans costs $1004. For septic or sewer approval, call (845) 808-1390 and ask for a Putnam County Health engineer4. Only 8.7% of county soils are rated without severe limits for a conventional drain field, so test feasibility early12.
Can you live in an RV or tiny home on your land in Putnam County?
We could not confirm residential RV or tiny-home occupancy rules for every Putnam County municipality; ask the parcel’s municipal building or zoning office about the proposed use.
We could not confirm residential RV or tiny-home occupancy rules for every Putnam County municipality; ask the parcel’s municipal building or zoning office about the proposed use3. Carmel’s recreational-vehicle areas allow transient camping, prohibit permanent living units and bar use as a primary residence; these provisions do not establish permission to live in an RV on an ordinary private parcel10. Carmel accessory dwelling units require at least 400 square feet and may not exceed 35% of the principal dwelling’s habitable floor area; detached ADUs also have a 650-square-foot ceiling10. The owner must live in the principal dwelling or ADU, and building permits and an occupancy certificate are required10. County Health must approve water and sewage arrangements; Town Engineer approval is also required for town water or sewer connections9. Indoor-plumbing wastewater must discharge to an approved septic system4.
Building a home in Putnam County: the steps, in order
Identify the parcel's town or village and obtain its zoning district, permitted-use list and district schedule because Putnam County has no countywide zoning code.
- Identify the parcel's town or village and obtain its zoning district, permitted-use list and district schedule because Putnam County has no countywide zoning code3.
- Ask Putnam County Health whether septic review is county-only or joint with NYC DEP and submit the required septic application4.
- Obtain a Putnam County Health permit before drilling a new-home well or re-drilling an existing-home well4.
- For a subdivision, obtain applicable municipal and County Health approvals; county health subdivision approvals last 5 years and may be renewed, and a Health-signed map is not valid until filed with the County Clerk4.
- Apply to the applicable local building authority for work governed by the Uniform Code1.
- Schedule each applicable building inspection and keep the work accessible and exposed until accepted1.
- Arrange septic inspections during construction and before backfilling an approved repair4.
- Obtain the required certificate of occupancy or compliance before occupying or using completed permit work1.
What to check before you buy land in Putnam County
Confirm the municipality and zoning district before closing because Putnam County has no countywide zoning code and municipal permitted uses, setbacks and lot standards may apply.
Confirm the municipality and zoning district before closing because Putnam County has no countywide zoning code and municipal permitted uses, setbacks and lot standards may apply3. Test septic feasibility early because only 8.7% of county soils are rated without severe limits for a conventional drain field12. Confirm the drinking-water plan because Putnam County Health requires a permit before a new-home well is drilled or an existing-home well is re-drilled4. Check clearing and grading needs because 90.4% of Putnam County is wooded and 67.7% of its land has a slope of 15% or less12. A driveway built or modified on a state highway requires a New York State Department of Transportation permit13. Private development in a floodplain requires a local floodplain development permit14.
Watch-outs
- Putnam County has no countywide zoning code; a Carmel rule is not a countywide permission or restriction3.
- Carmel’s short-term rentals require a special-use permit and Planning Board site-plan approval; tents, campers, RVs, trailers and mobile homes cannot serve as short-term rentals9.
- An owner-occupant may apply for manufactured-home installer certification, but a certified installer must be on site and supervise and certify homeowner installation work; the building-permit requirement remains6.
- Carmel’s ADU and district-specific dwelling-size standards do not establish a general tiny-home occupancy permission10.
Sources
14 official pages, each quoted and re-checked · written October 10, 2026
- Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code
- New York Executive Law § 381 (New York statewide rule)
- Putnam County Hazard Mitigation Plan, Section 9.1
- Environmental Health - Putnam County, New York
- Administration and Enforcement of the Uniform Code
- Division of Building Standards and Codes Frequently Asked Questions
- NYS Uniform Fire Prevention and Building Code: What Elected and Other Government Officials Need to Know
- Building Department | Carmel, NY
- Town of Carmel Zoning Code
- Town of Carmel Zoning Code, adopted March 5, 2025
- Environmental Health - Putnam County
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
- Residential Driveway Permits (New York statewide rule)
- Floodplain Management - NYSDEC (New York statewide rule)
Written October 10, 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.
Off-grid gear
Going off-grid in Putnam County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
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