Westchester County, NY Building Permits, Zoning & Septic

Westchester County, New York doesn't run one countywide building department; each city, town and village enforces the New York State Uniform Code and issues its own building permits, so the office you call depends on exactly which municipality your land sits in¹². Zoning works the same way: every municipality sets its own zoning, and the county Planning Board only reviews certain proposed zoning actions referred to it³². Septic is the one thing the county itself permits everywhere: a construction permit and plan review from the Westchester County Department of Health is required before building, repairing or replacing a septic system anywhere in the county⁴⁵.

At a glance

Building permit: Required statewide, but issued by each city, town or village, not by Westchester County government¹
Zoning: Set by each municipality; the county Planning Board only reviews certain referrals³
Septic permit: Required through the Westchester County Department of Health, countywide⁴
Owner-builder exemption: Not documented on county or municipal sources; confirm with your municipality's building department⁶
Septic-suitable soils: Only about 9.7% of the county's soils lack severe limits for a conventional drain field⁷
State building-permit fee schedule: $200 for the first 1,500 sq ft plus $100 per additional 1,000 sq ft under the NY DOS schedule; localities may set their own fees instead⁸
Subdividing land outside a village: Reviewed by the town planning board under Town Law, with a 62-day hearing and decision clock once a resolution authorizes it⁹
Property tax: About 1.6% effective rate; median bill around $10,001/year¹⁰¹¹

Who to call

Planning & zoning

Westchester County Department of Planning, Land Use and Zoning Referrals

Reviews certain zoning and planning actions referred by Westchester's cities, towns and villages; does not itself set zoning or issue building permits

(914) 995-2000

148 Martine Avenue, White Plains, NY 10601

Building permits

City of White Plains Department of Building (example municipal office; not countywide)

Enforces the New York State Uniform Fire Prevention and Building Code and the city's own building and zoning ordinances, and issues building permits, for the City of White Plains only

914-422-1269

70 Church St., White Plains, NY 10601

Septic permits

Westchester County Department of Health, Septic System Management

Licenses septic contractors, handles septic repair and records requests, and runs the county's septic rehabilitation/reimbursement programs for the whole county

(914) 995-7285

148 Martine Avenue, White Plains, NY 10601

Septic permits

Westchester County Department of Health, Realty Subdivision and Land Development Review

Reviews and permits every subdivision plan and new subsurface sewage treatment system for commercial and residential use across Westchester County

148 Martine Avenue, White Plains, NY 10601

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

Do you need a building permit in Westchester County, New York?

Yes: New York's Uniform Fire Prevention and Building Code applies throughout Westchester County, and building permits are required for work that must conform to that code, subject to permitted exceptions¹²¹³. Westchester does not provide one building-permit counter for every parcel; the responsible city, town or village ordinarily administers and enforces the code, so identify the municipality before applying¹⁴¹. A local code-enforcement program may exempt listed work such as a one-story detached shed or playhouse of 144 square feet or less associated with a one- or two-family home, certain low partitions, and finish work like painting or tiling, but exempt work must still comply with the Uniform Code¹⁵. The permit holder must keep covered work accessible until the municipality inspects and accepts it¹⁶.

Who issues building permits in Westchester County, and how do you reach them?

Start by identifying which of Westchester's cities, towns or villages your parcel is in, since that municipality's own building or code-enforcement department issues the permit, not Westchester County government¹. As an example of how one of these offices is set up, the City of White Plains Department of Building, at 70 Church St., White Plains, NY 10601, 914-422-1269, enforces the Uniform Code and the city's zoning and building ordinances inside White Plains city limits only¹⁷. Westchester County's own Department of Planning does not issue building permits or set zoning; it can be reached at (914) 995-2000, 148 Martine Avenue, White Plains, NY 10601, but its planning and zoning role is limited to reviewing certain actions that municipalities are required to refer to the County Planning Board². For a definitive answer on permits, fees or inspections for a specific address, contact that address's own municipal building department directly rather than the county².

Does Westchester County have zoning?

Zoning in Westchester County is administered at the city, town and village level, so the ordinance for the parcel's municipality is the one a buyer needs to read³. The Westchester County Planning Board reviews certain planning and zoning actions that municipalities must refer under state and county law, while the county's own page directs questions about specific local development and zoning projects to the individual municipality². We could not confirm a separate countywide zoning ordinance from the reviewed sources. For practical due diligence, ask the parcel's municipal zoning office about permitted uses, minimum lot size, setbacks, accessory dwellings, lot coverage and building height; do not carry an answer from one Westchester municipality into another³².

How do septic permits work in Westchester County?

Environmental engineers in the Westchester County Department of Health review and permit every subdivision plan and every new subsurface sewage treatment system for residential and commercial use to confirm adequate sewage disposal and drinking water⁴⁵. Plan for that review early: only about 9.7% of Westchester County soils lack severe limits for a conventional septic drain field, making a parcel-specific site evaluation essential before fixing a house location or budget⁷. County engineers also make field visits during construction to verify that the approved plans are followed⁵. Statewide, a septic system discharging less than 1,000 gallons per day of ordinary sewage does not need a state SPDES permit from the DEC, but that exemption does not remove possible county or local health approval before construction¹⁸. If an existing septic system is failing and the property is in the New York City watershed, the county program offers free design and repairs; call (914) 995-7285 to ask about eligibility¹⁹.

Can you live in an RV or tiny home on your land in Westchester County?

We could not confirm one countywide rule allowing residential RV use, temporary camping, tiny homes or manufactured homes on private land in Westchester County. Zoning is administered by the city, town or village where the parcel is located, so ask that municipality's building or zoning office about the proposed use, placement, setbacks and minimum dwelling size before buying or moving anything onto the land³². A tiny home treated as a dwelling must follow the permit process for work subject to the New York State Uniform Code, including construction inspections and a certificate of occupancy or compliance before occupancy¹³¹⁶²⁰. A neighboring municipality's answer is not a reliable answer for your parcel; the Westchester County Planning Department directs questions about specific local development and zoning projects to the individual municipality².

How do you build a home in Westchester County, step by step?

Identify the exact city, town or village your parcel sits in; that municipality, not Westchester County, runs building permitting and zoning for it¹³.
Contact that municipality's building or code-enforcement department to confirm zoning, setbacks and what construction documents your permit application needs²¹.
If the site isn't on public sewer, apply separately to the Westchester County Department of Health's Realty Subdivision and Land Development Review for a septic system permit and plan approval, since this runs through the county regardless of municipality⁵⁴.
Budget for a site evaluation and likely an engineered septic design; only about 9.7% of county soils avoid severe limits for a conventional drain field⁷.
Submit your building permit application to the municipal building department, expecting a fee roughly on the order of the state's published schedule, $200 for the first 1,500 square feet plus $100 per additional 1,000 square feet, unless your municipality sets its own fee⁸.
Complete the required inspections as construction proceeds; the state minimum standards don't require additional periodic inspections of an owner-occupied one- or two-family home once it's built, beyond the inspections tied to the permit itself²².
Obtain a certificate of occupancy from your municipality before occupying the home; only the local authority that issued the permit can grant it, and it requires a final compliance check first²³.

What should you check before buying land in Westchester County?

Confirm which of Westchester's municipalities the parcel is in before you assume any building, zoning or fee rule, since County government sets none of those directly³¹. Get a septic site evaluation from the Westchester County Department of Health early: with only about 9.7% of county soils free of severe limits for a conventional drain field, many Westchester lots need an engineered system, which affects both cost and buildable area⁷. If the property is in the New York City watershed and has an existing septic system, ask the county's Septic System Rehabilitation and Sewer Connection Program whether it qualifies for free repair or replacement design before you assume a failing system is a deal-breaker¹⁹. If you're planning to split the parcel into multiple lots outside an incorporated village, expect town planning board review under New York Town Law, including a public hearing and a decision within about 62 days of a complete application where no environmental impact statement is required⁹. Budget for Westchester's property taxes at roughly a 1.6% effective rate, translating to a median bill near $10,001 a year on a typical home in the county, well above what many rural counties charge¹⁰¹¹.

Watch-outs

Westchester has no countywide building or zoning office; the City of White Plains example here applies only inside White Plains, and every other city, town and village runs its own program¹⁷.
No source confirms an owner-builder exemption for Westchester; ask your specific municipality's building department whether one exists before assuming you can pull your own permit⁶.
The septic-soils statistic is a countywide average; get a site-specific evaluation from the county Department of Health rather than relying on it for one parcel⁷.

Sources

Written September 27, 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.

How Westchester County scores

Seclusion12100% ev.

Self-Sufficiency61100% ev.

Admin Boringness4490% ev.

Durability85100% ev.

Property Autonomy33100% ev.

Carry Cost32100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$879kTypical home

1.6%Property tax

$11,506Land / acre

48.2"Annual rain

5% of yrsSevere drought

1.6 / yr (+1.5)Mid-century 100°F days

11.5 daysMid-century dry spell

2.29" (+8.3%)Mid-century 1-day rain

1.36×Wildfire change factor

100%Forward climate coverage

$2,598Home insurance / yr

0.2% / yrInsurance growth

0.37%Nonrenewal rate

county median (2+ published ZIPs)Insurance basis

555,815People within 30 min

23,603,628People within 2 hr

858,268Radius comparison (15 mi)

2,300.4People / sq mi

0.6%Federal land

78.9%Land at 15% slope or less

9.7%Septic soil without severe limits

20,488 acWorkable land screen

96.8 tonsBiomass / forest ac

52.1°FAvg temp

Answers from the rulebook for Westchester County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Westchester County rules

County-wide zoningPresent
Zoning in Westchester is administered at the municipal (city/town/village) level; e.g., the City of White Plains Zoning Ordinance.
City of White Plains - Zoning Ordinance ↗Scouted from the county site, not yet independently re-checked

New York rules that apply here

Building permitRequired
Work that must conform to the New York State Uniform Code or Energy Code throughout New York State except New York City, where the city has its own construction code; local authorities having jurisdiction administer and enforce the state requirements within their boundaries.
- A local authority having jurisdiction may expressly exempt one or more listed categories of work from the building-permit requirement.
- Permitted exemption categories include one-story detached tool or storage sheds, playhouses, or similar structures associated with one- or two-family dwellings or townhouses not exceeding 144 square feet gross floor area; temporary sets and scenery; certain window awnings; partitions or movable cases less than 5 feet 9 inches high; painting, wallpapering, tiling, carpeting, or similar finish work; listed portable equipment or appliances; certain equipment replacements; and repairs that do not affect fire and life safety.
- A permit exemption does not authorize work violating the Uniform Code or Energy Code.
- Beginning December 31, 2025, regulated parties submitting building permit applications must comply with the 2025 NYS Uniform Code, subject to the stated transition option before that date.
maximum gross floor area for listed detached accessory structures: <= 144 square feet (Only for one-story detached structures associated with one- or two-family dwellings or townhouses and used for tool/storage sheds, playhouses, or similar uses.) · height threshold for listed partitions or movable cases: < 5 feet 9 inches
“Each authority having jurisdiction shall include in its code enforcement program provisions requiring building permits to be required for work that must conform to either or both of the Codes.”
Part 1203 Uniform Code and the Energy Code: Minimum Standards for Administration and Enforcement ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Required — Work required to conform to the New York State Uniform Code in Westchester County.
  “Building permits must be required for any work which is required to conform to the Uniform Code. Certain exceptions are permitted.”
  Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code: What Elected Officials Need to Know ↗Re-checked Sep 26, 2026
Building code adoptedAdopted
New York State Uniform Fire Prevention and Building Code applicable in Westchester County.
- The Uniform Code is automatically effective in each city, town, and village outside New York City.
- Local governments cannot exclude themselves from the Uniform Code.
- Local governments may adopt more restrictive standards only through the statutory notice, petition, and Code Council approval process.
“The Uniform Code is applicable in every part of the State (except the City of New York, which was permitted to retain its own code).”
Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code: What Elected Officials Need to Know ↗Re-checked Sep 26, 2026
InspectionsRequired
Construction work for which a building permit has been issued and which is subject to the Uniform Code or Energy Code, administered by the applicable local authority having jurisdiction throughout New York State except New York City.
- Inspections may be performed in person or remotely when the authority determines the remote inspection can be performed to the same level and quality and provides sufficient information; otherwise an in-person inspection is required.
- Where applicable, inspections include the worksite before permit issuance, footing and foundation, concrete slab preparation, framing, structural/electrical/plumbing/mechanical/fire-protection systems, fire-resistant construction and penetrations, heating appliances/chimneys/flues/gas vents, Energy Code compliance elements, manufactured buildings or homes, and a final inspection.
- Permit work must remain accessible and exposed until inspected and accepted; the permit holder must notify the authority when work is ready for inspection.
- The state minimum standards do not require regular periodic inspections of owner-occupied one- and two-family dwellings or agricultural buildings used directly and solely for agricultural purposes, but this does not limit inspections invited by the owner or required where conditions threaten or present a public-health, safety, or welfare hazard.
maximum interval for periodic fire-safety and property-maintenance inspections of multiple dwellings and nonresidential occupancies: <= 3 years (This periodic-inspection interval does not apply as a requirement to owner-occupied one- and two-family dwellings or qualifying agricultural buildings.)
“Each authority having jurisdiction shall include in its code enforcement program provisions requiring the authority having jurisdiction, or an individual or entity contracted by the authority having jurisdiction and satisfying the requirements set forth in section 1203.2 (e)(2), to perform construction inspections required by the Codes including those listed in this paragraph, either in-person or remotely.”
Part 1203 Uniform Code and the Energy Code: Minimum Standards for Administration and Enforcement ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Required — Specified construction elements under the New York State Uniform Code in Westchester County.
  “Inspections of certain specified elements of the construction process must be required. Building permits holders must keep work accessible and exposed until inspected and accepted by the municipality.”
  Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code: What Elected Officials Need to Know ↗Re-checked Sep 26, 2026
Certificate of occupancyRequired
Work subject to a building permit and the Uniform Code or Energy Code, and structures or portions converted from one use or occupancy classification or subclassification to another, throughout New York State except New York City.
- Permission to use or occupy covered buildings or portions is granted only by issuance of a certificate of occupancy or certificate of compliance, except as provided for temporary certificates of occupancy.
- Before issuance, the authority must inspect and determine compliance with applicable Codes and, where applicable, review structural-observation statements, special-inspection reports, flood-hazard certifications, Energy Code test results, and manufactured-building or manufactured-home seals, insignias, and data plates.
- A temporary certificate may be issued before completion for a specified period and specified portions, subject to safe occupancy, operational fire and life-safety components, required means of egress, and completion of remaining work.
temporary certificate period: specified period (The permit holder must undertake to bring the structure into full compliance with the Codes.)
“The code enforcement program shall provide that, except as provided in section 1203.3 (d)(4), permission to use or occupy a building or structure, or portion thereof, for which a building permit was previously issued, or which has been converted from one use or occupancy classification or subclassification to another, shall be granted only by issuance of a certificate of occupancy or a certificate of compliance.”
Part 1203 Uniform Code and the Energy Code: Minimum Standards for Administration and Enforcement ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Required — Work requiring a building permit and changes in general occupancy classification in Westchester County.
  “A certificate of occupancy or a certificate of compliance must be required (1) for all work for which a building permit was required and (2) whenever the general occupancy classification of a building is changed.”
  Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code: What Elected Officials Need to Know ↗Re-checked Sep 26, 2026
Who permits septicMixed (with conditions)
Residential and other septic or cesspool systems statewide in New York.
- New York State DEC administers SPDES permitting for regulated wastewater discharges.
- For systems with less than 1,000 gallons per day of sewage-wastewater discharge to groundwater and no industrial or other non-sewage wastes, approval may still be required from the appropriate city health department, county health department, or district office of the New York State Department of Health before construction.
- The actual local or district health authority depends on the property location.
groundwater discharge design flow threshold: < 1000 gallons per day (No industrial or other non-sewage wastes)
“city health department, county health department”
State Pollutant Discharge Elimination System (SPDES) Permit Program ↗Re-checked Sep 12, 2026
Septic permitLimited
Facilities discharging sewage-wastewater to groundwater through septic systems or similar systems statewide.
- A SPDES permit is not required when total groundwater discharge design flow is less than 1,000 gallons per day and the wastewater contains no industrial or other non-sewage wastes.
- The exemption does not eliminate possible approval requirements from the appropriate city health department, county health department, or district office of the New York State Department of Health before construction.
- Other DEC permits or approvals from other agencies may also be required.
groundwater discharge design flow: < 1000 gallons per day (Sewage-wastewater containing no industrial or other non-sewage wastes)
“No SPDES permit is required [...] less than 1,000 gallons per day [...] no industrial or other non-sewage wastes”
State Pollutant Discharge Elimination System (SPDES) Permit Program ↗Re-checked Sep 12, 2026
Subdividing landRegulated (with conditions)
Subdivision review in towns, for the portion of a town outside incorporated villages, where the town board authorizes the planning board to review plats.
- Authorization is by town-board resolution; the statute does not establish one uniform approval process for every municipality.
- The statute defines subdivision by reference to local ordinances, laws, rules, or regulations.
- Preliminary and final plat review is subject to SEQRA coordination and statutory hearing and decision procedures.
- A conditional final-plat approval does not qualify the plat for recording or authorize building permits until required signing and recording occur.
preliminary-plat hearing deadline when no environmental impact statement is required: 62 days (after receipt of a complete preliminary plat) · preliminary-plat decision deadline when no environmental impact statement is required: 62 days (after close of the public hearing) · final-plat filing deadline: 62 days (from final approval, otherwise approval expires)
“For the purpose of providing for the future growth and development of the town and affording adequate facilities for the housing, transportation, distribution, comfort, convenience, safety, health and welfare of its population, the town board may, by resolution, authorize and empower the planning board to approve preliminary and final plats of subdivisions showing lots, blocks or sites, with or without streets or highways, within that part of the town outside the limits of any incorporated village.”
New York Town Law § 276: Subdivision review; approval of plats; development of filed plats ↗Re-checked Sep 12, 2026
Permit feesVariable (with conditions)
New York State Department of State building-permit administration and enforcement fees.
- The schedule is identified as having a publication date of August 2022.
- Fees vary by project type, building type, area, dwelling unit, sleeping room, inspection, and permit category.
- For one- and two-family homes including accessory structures constructed contemporaneously, the schedule lists $200 for the first 1,500 square feet and $100 for each additional 1,000 square feet or fraction thereof.
- Permit renewals have no fee.
- Building-permit fees include construction inspections required as a result of the permit; additional inspection fees may apply.
- Local authorities may have separate fees or requirements.
publication date: August 2022 · one- and two-family homes fee for first 1,500 square feet: 200 USD (including accessory structures constructed contemporaneously) · one- and two-family homes fee for each additional 1,000 square feet or fraction: per 100 USD (after the first 1,500 square feet) · permit renewal fee: 0 USD
“$ 200 First 1,500 square feet of area $ 100 Each additional 1,000 square feet of area or fraction thereof”
Department of State Administration and Enforcement Fee Schedule ↗Re-checked Sep 12, 2026
Permit processPublished (with conditions)
Building-permit applications for work subject to the New York State Uniform Code or Energy Code, administered through the authority having jurisdiction’s code-enforcement program.
- A building permit is required for work that must conform to the Uniform Code or Energy Code.
- The code-enforcement program may exclude listed categories, including qualifying detached structures not exceeding 144 square feet, temporary sets and scenery, certain awnings, partitions or movable cases under 5 feet 9 inches, finish work, listed portable equipment, qualifying equipment replacements, and repairs that do not affect fire and life safety.
- Excluded work must still conform to applicable Uniform Code and Energy Code provisions.
- An authority having jurisdiction may instead require permits for all work subject to the Uniform Code and Energy Code.
- Applications must include, at minimum, the work location, nature, extent and scope; tax map number and street address; occupancy classification; applicable special-inspection statement; and acceptable construction documents.
- Construction documents may need site plans, code-compliance information, structural and building-system information, Energy Code compliance, flood-hazard information, and licensed architect or professional-engineer documentation where applicable.
detached accessory structure exemption threshold: <= 144 square feet (one-story detached structures associated with one- or two-family dwellings or multiple single-family dwellings used for tool/storage sheds, playhouses, or similar uses) · movable partition or case exemption height: < 5 feet 9 inches
“An authority having jurisdiction’s code enforcement program must require any party who proposes to perform any work which must conform with the Uniform Code”
Administration and Enforcement of the Uniform Code ↗Re-checked Sep 12, 2026
One more reviewed finding on this topic
- Published (with conditions) — Uniform Code administration and enforcement process applicable in Westchester County.
  “Each local government’s program for administration and enforcement of the Uniform Code must conform with the requirements of Part 1203, and must include the following features:”
  Legal Memorandum LG03: NYS Uniform Fire Prevention and Building Code: What Elected Officials Need to Know ↗Re-checked Sep 26, 2026

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

Owner-builder exemption — Owner-builder exemptions from building-code or permit requirements.
Zoning districts — Publication of zoning districts across Westchester County.
Minimum dwelling size — Minimum dwelling size requirements.
Minimum lot size — Minimum lot size requirements.
Setbacks — Building setbacks.

15 more unanswered

Lot coverage
Building height
Living in an RV
Camping on your land
Tiny homes
Manufactured homes
Accessory dwellings
Septic inspection
Off-grid sanitation
Well permit
Mandatory utility hookup
Agricultural exemption
Driveway access
Building in a floodplain
Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Westchester County, New York

Is Westchester County a good place to live off-grid or homestead?

Westchester County scores 35/100 on the Bolthole Index, a marginal county profile. Its strengths: a durable current and mid-century hazard profile and strong self-sufficiency basics: 48.2″/yr rainfall with little drought. Watch-outs: about 555,815 people within a 30-minute drive and higher long-term carry cost.

Do you need a building permit in Westchester County, New York?

Westchester County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Westchester County Department of Health. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Westchester County, New York?

Land in Westchester County runs about $11,506 per acre, based on the latest county data.

What is the water situation in Westchester County?

Westchester County gets about 48.2" of rain a year, with severe drought in roughly 5% of years.

How remote is Westchester County?

A representative private-land location has about 555,815 people within a 30-minute drive and 23,603,628 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

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

At a glance

Who to call

Do you need a building permit in Westchester County, New York?

Who issues building permits in Westchester County, and how do you reach them?

Does Westchester County have zoning?

How do septic permits work in Westchester County?

Can you live in an RV or tiny home on your land in Westchester County?

How do you build a home in Westchester County, step by step?

What should you check before buying land in Westchester County?

Watch-outs

Sources

Westchester County in New York

How Westchester County scores

Find land. Bring the promising ones back.

Parcel due diligence

Answers from the rulebook for Westchester County

Westchester County rules

New York rules that apply here

Still unanswered

Living off-grid in Westchester County, New York

Is Westchester County a good place to live off-grid or homestead?

Do you need a building permit in Westchester County, New York?

How much does land cost in Westchester County, New York?

What is the water situation in Westchester County?

How remote is Westchester County?

How Westchester compares in New York