Bolthole Index

Suffolk County, New York

Zoning, building permits and septic rules in the Village of Lake Grove, NY

The Village of Lake Grove, New York requires a village building permit for work covered by the state Uniform Code1. The village sets its own zoning under Village Code Chapter 1752. Suffolk County has no direct zoning power3, and septic approval for a new home comes from the Suffolk County Department of Health Services4.

At a glance

Building permit
Required from the Village of Lake Grove1
Zoning
Village zoning, Chapter 175; the county does not zone23
Septic
Suffolk County Department of Health Services approval for a new home4
Minimum lot, B Residence 1
20,000 sq ft with 125 ft of frontage5
Second dwelling or accessory apartment
Prohibited on single-family property6
Short-term rentals
Renting for less than one year is prohibited7
RV or tiny-home living
Not confirmed; ask the Building Inspector8

Who to call

Building permits

Village of Lake Grove Village Hall (Building Inspector, Planning Board and Zoning Board)

Village building permits, code enforcement, planning board and zoning board matters, and village permit forms

(631) 585-2000

980 Hawkins Avenue Lake Grove, NY 11755

Septic permits

Suffolk County Department of Health Services, Office of Wastewater Management

Septic and water-supply approvals for new homes in Suffolk County, including inside villages

(631) 852-5700

360 Yaphank Avenue Suite 2C Yaphank, New York 11980

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

Going off-grid in Village of Lake Grove means bringing your own water and power. The kit we’d start with:

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Does Lake Grove, NY have zoning, and what does it mean for lot size and setbacks?

The Village of Lake Grove in Suffolk County adopts and enforces its own zoning through Village Code Chapter 1752. Suffolk County itself has no direct zoning power, so the village code is the zoning that applies to a lot inside Lake Grove3.

In the B Residence 1 District, which the code schedules for single-family dwellings, a lot needs at least 20,000 square feet and 125 feet of frontage measured 40 feet back from the street line5. Lake Grove requires a front yard of at least 40 feet, subject to an average-front-yard-line rule9. Side yards must total 45 feet with no side yard under 20 feet, and the rear yard must be at least 60 feet9. Buildings may cover no more than 20% of the lot10, and may rise no higher than 35 feet or 2 1/2 stories11.

Other districts have different numbers, so confirm the district on the village zoning map before you buy.

Can you build a second home, rent short-term, or live in an RV or tiny home in Lake Grove?

Lake Grove prohibits more than one dwelling unit, or occupancy by more than one family, on property zoned for single-family use, which rules out an accessory apartment or a second house on the lot6. Renting individual rooms or renting for less than one year is also prohibited in the village7.

We could not confirm any village rule on living in an RV, camping on private land, or occupying a tiny home. The Village Building Inspector can say whether a given setup is allowed; call Village Hall before you buy8. Lake Grove is a village with its own zoning, so a rule found for another New York municipality does not carry over.

Do you need a building permit in Lake Grove, and who issues it?

Yes. Lake Grove requires a building permit from the Village before work starts or a use or occupancy changes1. The village's Code Enforcement Official administers the Uniform Code, the Energy Code and village Chapter 6512. Suffolk County does not issue building permits for private homes inside the village13.

A new dwelling needs Suffolk County Department of Health Services approval before the village issues the permit, the application must be in writing, and a foundation survey is required before work starts1. Work must stay exposed until the village inspects it14, and a certificate of occupancy or compliance is required for work done under a building permit15.

The village posts residential and commercial permit filing requirements on its online forms page8. We could not confirm the village building-permit fee schedule; ask Village Hall.

Adding or widening a driveway or an extra curb cut needs approval from the Building Inspector or Planning Board16.

How do septic permits work inside Lake Grove?

The village does not approve septic systems. The Suffolk County Department of Health Services, Office of Wastewater Management, requires a permit for a new home, and that applies to every address in the county, village or not417. Construction is approved first, then an inspection must be requested before the system is used18.

County rules favor connecting to sewers where available: all sewer connections must be approved19. Where a lot outside a sewer district uses an individual system, the county code generally calls for parcels of at least 20,000 square feet20, and new or expanded single-family homes may need an innovative or alternative system21.

About 1.2% of Suffolk County soils rate as not limited for a conventional drain field, so most lots need a site evaluation or an engineered system22.

We could not confirm a village well-permit rule. The county tests private drinking wells for a fee of $100 for approved existing wells and $350 for new construction23.

Building a home in Lake Grove: the steps, in order

  1. Confirm the lot's zoning district and the lot size, frontage and setbacks with the Village Building Inspector58.
  2. Get Suffolk County Department of Health Services approval for water supply and sewage disposal21.
  3. File a written building permit application with the village, with a foundation survey1.
  4. Get driveway or curb-cut approval from the Building Inspector or Planning Board16.
  5. Keep work exposed for village inspections14.
  6. Obtain a certificate of occupancy or compliance before moving in15.

What stays with Suffolk County, and what should you check before buying in Lake Grove?

Septic and water-supply approvals stay with Suffolk County, not the village4. A driveway that opens onto a county road needs a county Highway Work Permit24, and one on a state highway needs a New York State Department of Transportation permit25. Flood-damage rules sit in village Chapter 9226. For land outside the village, see the Suffolk County page.

Taxes are county-level figures: Suffolk County's effective property tax rate is 1.9%27, and the median bill is about $10,001 a year28.

Watch-outs

  • Lake Grove prohibits rentals of less than one year and accessory apartments on single-family property, so plan income-property ideas around those limits76.
  • We could not confirm whether the village allows owner-built homes, RV or tiny-home living, or a minimum dwelling size; ask the Village Building Inspector at Village Hall8.
  • A statewide homeowner form (BP-1) is not available for building your own new primary or secondary residence, so do not assume an owner-builder shortcut29.

Sources

  1. Village of Lake Grove Code, Chapter 65, Article II: Building Department (Village of Lake Grove), quoted and re-checked
  2. Village of Lake Grove, NY Code of Ordinances (Village of Lake Grove), quoted and re-checked
  3. Suffolk County Planning Commission Minutes: November 5, 2003, quoted and re-checked
  4. Wastewater Management, quoted and re-checked
  5. Village of Lake Grove Code, Article III: B Residence I District (Village of Lake Grove), quoted and re-checked
  6. Village of Lake Grove Code, Article III: B Residence I District (Village of Lake Grove), quoted and re-checked
  7. Village of Lake Grove Code, Chapter 127: Rental Regulations (Village of Lake Grove), quoted and re-checked
  8. Village of Lake Grove Village Hall (Building Inspector, Planning Board and Zoning Board) (lakegroveny.gov)
  9. Village of Lake Grove Code, Article III: B Residence I District (Village of Lake Grove), quoted and re-checked
  10. Village of Lake Grove Code, Article III: B Residence I District (Village of Lake Grove), quoted and re-checked
  11. Village of Lake Grove Code, Article III: B Residence I District (Village of Lake Grove), quoted and re-checked
  12. Village of Lake Grove Code, Chapter 65, Article II: Building Department (Village of Lake Grove), quoted and re-checked
  13. Village of Port Jefferson (Suffolk County) - Building Permit Application (2026 county census)
  14. Village of Lake Grove Code, Chapter 65, Article II: Building Department (Village of Lake Grove), quoted and re-checked
  15. Village of Lake Grove Code, Chapter 65, Article II: Building Department (Village of Lake Grove), quoted and re-checked
  16. Village of Lake Grove Code, Chapter 65, Article II: Building Department (Village of Lake Grove), quoted and re-checked
  17. Suffolk County Department of Health Services, Office of Wastewater Management (suffolkcountyny.gov)
  18. Wastewater Management, quoted and re-checked
  19. Sewer Permits, quoted and re-checked
  20. Suffolk County Sanitary Code – Article 6, quoted and re-checked
  21. Suffolk County Sanitary Code Article 6, quoted and re-checked
  22. 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
  23. Private Well Water Testing Program, quoted and re-checked
  24. Non-Utility Highway Work Permit, quoted and re-checked
  25. Residential Driveway Permits (New York statewide rule), quoted and re-checked
  26. Village of Lake Grove Code, Chapter 92: Flood Damage Prevention (Village of Lake Grove), quoted and re-checked
  27. Effective property tax rate: Bolthole Index county data
  28. Median property tax bill: Bolthole Index county data
  29. STATE & MUNICIPAL, quoted and re-checked

Written October 24, 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.

Answers from the rulebook for Village of Lake Grove

Village of Lake Grove’s own rules

  • Building permitRequired

    Work on buildings or structures inside Lake Grove village that must conform to the Uniform Code, Energy Code, or Village Code.

    • A permit is required for listed construction, enlargement, alteration, improvement, removal, relocation, demolition, use/occupancy change, and specified solid-fuel appliances.
    • conditions for a new dwelling include Suffolk County Department of Health Services approval before issuance.
    • An application must be made in writing and a foundation survey is required before work starts.
    “No person shall commence any work or change a use or occupancy for which a building permit is required without first having obtained a building permit from the Village.”
  • Building code adoptedAdopted (with conditions)

    Construction regulated by the Village Building Department inside Lake Grove village.

    • The Code Enforcement Official administers and enforces the Uniform Code, Energy Code, and Chapter 65.
    “The Code Enforcement Official shall administer and enforce all the provisions of the Uniform Code, the Energy Code, and this chapter.”
  • InspectionsRequired

    Buildings or structures constructed under a Village-issued permit inside Lake Grove village.

    • Inspections occur during construction as practical; the Code Enforcement Official also conducts construction inspections and inspections before specified certificates.
    “Work shall remain accessible and exposed until inspected and accepted by the Code Enforcement Official or Building Inspector or by an Inspector authorized by the Code Enforcement Official.”
  • Certificate of occupancyLimited

    Uses and structures for which Lake Grove issues a certificate of occupancy or related certificate.

    • The opened ordinance establishes Village review, approval/disapproval, issuance, and pre-issuance inspections; the specific triggers for every construction type were not fully extracted.
    “A certificate of occupancy or certificate of compliance shall be required for any work which is the subject of a building permit”
  • Local zoningPresent (with conditions)

    Land inside the Village of Lake Grove.

    • Use and development must comply with Village Code Chapter 175 and its district regulations.
    “In B Residence 1 District, no building, structure or premises shall be used or occupied, and no building or part thereof or other structure shall be erected or altered, unless otherwise provided in this chapter, except for one or more of the following uses:”
  • Accessory dwellingsProhibited

    An accessory apartment or a second dwelling unit on property zoned for single-family use inside Lake Grove village.

    • The prohibition applies to property or structures zoned for single-family use or occupancy.
    “it shall be prohibited to occupy, use or maintain a property or structure that is zoned for single-family use or occupancy by more than one family or to maintain more than one dwelling unit.”
  • Driveway accessRequired

    A driveway added or altered, or an additional curb cut, inside Lake Grove village.

    • Approval must be from the Building Inspector or Planning Board.
    “No driveway is to be added or an existing driveway altered in size or location, or an additional curb cut added unless approved by the Building Inspector or Planning Board.”
  • Building in a floodplainLimited

    Flood-damage prevention and development subject to Village Code Chapter 92 inside Lake Grove village.

    • Chapter 92 contains a permitting official, permit requirements, application/fee provisions, procedures, and a variance procedure; detailed triggers were not extracted.
    “Article II Administration § 92-5 Permitting official. § 92-6 Permit requirements. § 92-7 Application; fee. § 92-8 Permitting procedures. Article III Variance Procedure”
  • Short-term rentalsProhibited

    Rental of residential property for less than one year inside Lake Grove village.

    • The excerpt also conditions eligibility to rent on ownership and use as primary residence for at least five continuous years.

    minimum rental duration: >= 1 year

    “Renting individual rooms and renting for less than one year of time is prohibited.”
  • Permit feesVariable (with conditions)

    Village rental-occupancy permits and renewals inside Lake Grove village.

    • The annual application fee is set from time to time by Board of Trustees resolution and the fee schedule is retained by the Village Clerk.
    “A nonrefundable annual permit application fee as set from time to time by resolution of the Board of Trustees shall be paid”

Rules another office applies inside Village of Lake Grove

Village of Lake Grove does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Minimum lot sizeSpecified

    B Residence 1 District inside Lake Grove village; the schedule identifies this district's principal use as single-family dwellings.

    • Minimum frontage is measured at a point 40 feet back of the street line.

    minimum lot area: >= 20000 square feet · minimum frontage: >= 125 feet (at a point 40 feet back of the street line)

    “no building or structure shall be erected on a lot having an area less than 20,000 square feet or upon a lot having a frontage of less than 125 feet at a point 40 feet back of the street line.”
  • SetbacksSpecified

    B Residence 1 District inside Lake Grove village.

    • The front-yard average-line alternative applies if 40% or more of frontage on that side between intersecting streets is improved with buildings and a majority observed an average front-yard line varying by no more than six feet.
    • The front-yard rule does not require more than 60 feet.

    front yard depth: >= 40 feet (subject to the § 175-11 average-front-yard-line rule) · side yards total width: >= 45 feet · minimum individual side yard: >= 20 feet · rear yard depth: >= 60 feet

    “there shall be two side yards, one on each side of the building, the total width of both to be 45 feet and no one side yard to be less than 20 feet wide.”
  • Lot coverageSpecified

    B Residence 1 District inside Lake Grove village.

    maximum total building area: <= 20 percent of total lot area

    “In B Residence 1 District, the total building area shall not exceed 20% of the total lot area.”
  • Building heightSpecified

    B Residence 1 District inside Lake Grove village.

    maximum height: <= 35 feet · maximum stories: <= 2 1/2 stories

    “In B Residence 1 District, no building or structure shall be erected or altered to a height in excess of 35 feet or 2 1/2 stories.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Village of Lake Grove or Suffolk County directly.

  • Owner-builder exemption — Owner-built residential construction inside Lake Grove village.
  • Minimum dwelling size — One-family dwellings inside Lake Grove village.
  • Living in an RV — RV occupancy on private land inside Lake Grove village.
  • Camping on your land — Temporary camping on private land inside Lake Grove village.
  • Tiny homes — Tiny-home occupancy inside Lake Grove village.
6 more unanswered
  • Manufactured homes
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption

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.

Unanswered questions are usually a sign that Village of Lake Grove publishes no rule on the point, not that none exists. Suffolk County’s page lists the county offices to call.

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