How Islip Handles Fence Regulations: A Practical Guide

Islip maintains 115 local ordinances across all categories, and 8 of those deal specifically with fence regulations. Here is a breakdown of what the city actually requires, what is prohibited, and where Islip falls on the strict-to-permissive spectrum compared to other cities.

Neighbor Fence Rules

Islip requires fences over 4 feet to be set back 15 feet from a street and 10 feet from a second front yard line, keeps any obstruction over 3 feet out of required sight triangles, and prohibits gates that open into a street.

Key details: Fence over 4 ft - front setback: 15 ft. Fence over 4 ft - second front yard setback: 10 ft. Sight triangle / within 8 ft of pavement: Max 3 ft high. Gates: May not open into a street (Sec. 68-406D).

Fences placed inside a required setback or sight triangle, or gates opening into a street, are enforced by the Town of Islip Division of Building and Department of Public Safety. The Town may require relocation or removal; relief from setbacks must be sought from the Zoning Board of Appeals, and violations carry the penalties in Chapter 68.

Material Restrictions

Islip permits wood, vinyl, chain link, aluminum, and masonry fencing. Barbed wire and electrified fencing prohibited in residential zones. Historic districts require board approval for material choice. Waterfront fencing must use materials resistant to salt spray and hurricane winds.

Key details: Allowed: Wood, vinyl, chain, aluminum. Prohibited Residential: Barbed, electric. Front Chain Link: Prohibited. Historic: Board approval.

Prohibited material installation 500 dollars plus removal order. Historic district violations up to 1,000 dollars.

Fence Requirements

Islip Town Code requires a sight triangle of 25 feet measured from the intersection of street right-of-way lines on corner lots. Fences, hedges, and obstructions over 30 inches tall are prohibited in this triangle to maintain driver visibility.

Key details: Triangle: 25 ft each direction. Max Height: 30 inches. Applies: All corner lots. Fine: 250 dollars.

250 dollars first offense plus immediate trimming or removal order. If an accident results from obstruction, civil liability may attach to property owner.

Compared to other cities, Islip takes a harder line on fence requirements. The enforcement and penalty structure reflects that.

Retaining Walls

Retaining and other walls greater than 18 inches above average undisturbed grade must obtain a permit before construction and be set back from any property line by at least 4 feet or a distance equal to the wall's height, whichever is greater.

Key details: Permit threshold: Walls over 18 inches above grade. Setback: Min. 4 ft or equal to wall height, whichever is greater. Walls 18 in or less: No permit/setback unless Town Engineer directs. Code Section: Sec. 68-406F, 68-406G.

Constructing a wall over 18 inches without a permit, or without the required setback, is enforced by the Divisions of Building and Engineering. The Town may require a permit, a setback correction, or removal, and may impose the penalties in Chapter 68 of the Town Code.

Approved Materials

Islip prohibits electric fences and barbed, razor or concertina wire, requires any fence over 6 feet to be an open chain-link type, bars chain-link (cyclone) fences in front yards of Business and General Service Districts, and requires wrought-iron fencing along mini-storage street frontages.

Key details: Electric fences: Prohibited (Sec. 68-406E). Barbed/razor/concertina wire: Prohibited unless required by law. Fence over 6 ft: Must be open chain-link type (Sec. 68-406A). Chain-link in front yard (Business/GS): Prohibited (Sec. 68-406J).

Installing a prohibited electrified, barbed or razor-wire fence, or a non-conforming chain-link fence in a regulated district, is a Town Code violation abatable by the Division of Building and the Department of Public Safety. Remedies include removal of the prohibited material and the penalties provided under Chapter 68 of the Town Code.

This is one of the stricter rules in Islip's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Pool Barriers

Swimming pools in Islip must be surrounded by barriers that comply with the New York State Residential Code and the Town of Islip Town Code; owners must consult a Building Plans Examiner and the Zoning Department.

Key details: Governing codes: NYS Residential Code + Town of Islip Town Code. Typical barrier height: Min. 48 inches (NYS standard). Gates: Self-closing, self-latching, opening away from pool (NYS). Who to consult: Building Plans Examiner and Zoning Department.

An unfenced or non-compliant pool barrier is a violation of the New York State Residential Code and the Town Code, enforced by the Division of Building. The Town may issue an order to remedy, withhold or revoke a certificate of occupancy/compliance, and impose penalties; a pool may not be filled or used until a conforming barrier is in place.

Compared to other cities, Islip takes a harder line on pool barriers. The enforcement and penalty structure reflects that.

Permit Requirements

The Town of Islip does not require a permit to install a fence as long as it complies with zoning and traffic-safety rules, but a permit is required before constructing any wall greater than 18 inches in height above average undisturbed grade.

Key details: Fence permit: Not required if compliant with zoning/traffic safety. Wall permit threshold: Required for walls over 18 inches (Sec. 68-406F). Wall setback: Min. 4 ft or equal to wall height, whichever is greater. Walls 18 in or less: No permit/setback unless directed by Town Engineer (Sec. 68-406G).

Building a wall over 18 inches without the required permit, or a fence that violates zoning or traffic-safety provisions, is enforced by the Division of Building. The Town may issue a stop-work order, require a permit application after the fact, and impose the penalties provided in Chapter 68 of the Town Code.

If you are coming from a city with tighter rules, you will find Islip gives residents more flexibility on permit requirements.

Height Limits

In the Town of Islip a fence may be no higher than 4 feet within 15 feet of a street property line, no higher than 6 feet for a solid privacy fence in side and rear yards, and up to 8 feet only if it is an open chain-link type that does not block more than 15% of light or visibility.

Key details: Front yard (within 15 ft of line): 4 ft (3 ft at corner or driveway). Side/rear privacy (solid) fence: 6 ft. Open/chain-link fence max: 8 ft (over 6 ft must be open type). Code Section: Sec. 68-406A, 68-406B.

Fences exceeding these heights are zoning violations enforced by the Town of Islip Division of Building and the Department of Public Safety. Owners may be required to lower or remove the fence or seek relief from the Zoning Board of Appeals; continued violations of the Town Code are subject to the penalties in Chapter 68.

The Bottom Line

Islip is tougher than many cities when it comes to fence regulations. Out of the 8 rules covered here, 3 are rated strict. If you are a homeowner, renter, or business owner in Islip, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

All of the above reflects Islip's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.