Yonkers
New York’s third-largest city: 87,000 housing units, mid-rise rentals averaging eleven stories, built across ridges.
Westchester County, NY
Westchester runs two economies and they need opposite systems
A dense, renter-heavy southwest that looks far more like the Bronx than the brochures admit, and a corporate and estate north where the job starts at a gate a quarter mile from the house.
The county, honestly
Forty-five municipalities and three separate businesses
Westchester is 6 cities, 19 towns and 23 incorporated villages. Three of those (Harrison, Mount Kisco and Scarsdale) are coterminous town-and-village entities counted twice. Villages sit inside towns. The Town of Greenburgh alone contains six villages and spans nine school districts. There is a City of Rye and a separate Town of Rye, and they are not the same place. All of that matters because the building department, the code official and the fee schedule change with the line on the map.
The southwest urban core. Yonkers, Mount Vernon, Port Chester and large parts of New Rochelle, White Plains and Ossining village are dense pre-war and mid-century apartment stock, walk-ups, elevator buildings and two-to-six family houses. Homeownership runs 42.9% in Mount Vernon, 46.2% in Yonkers, 46.5% in Port Chester. County-wide it is 61.8%, below the national 65.2%. That is unusual for an affluent suburb and the reason Westchester has a multifamily security market at all. The work here is intercom replacement, vestibule door control, credential churn, package rooms, garages and stairwell cameras.
The I-287 corporate spine. The Platinum Mile runs roughly four miles from 333 Westchester Avenue in White Plains to 800 Westchester Avenue in Rye Brook: south side White Plains, north side Harrison. Between 1972 and 1988 about 4.5 million square feet of office was built on 256 acres in Purchase alone. IBM’s world headquarters is in Armonk, Mastercard’s and PepsiCo’s are in Purchase, Regeneron’s is in Tarrytown, and Westchester Medical Center and New York Medical College anchor Valhalla. The county claims 170-plus company headquarters employing more than 400,000 people.
The northern estate belt. Bedford, Pound Ridge, North Salem, Lewisboro, Somers, North Castle and New Castle are multi-acre wooded properties with stone walls, dirt roads, barns, guest houses and pool houses. Bedford’s riding-lane association maintains more than 200 miles of private trails; Pound Ridge has ridges up to 800 feet. Nothing about that geography is friendly to a 100-meter cable limit.
61.8%Westchester homeownership, below the US rate of 65.2%: the county is unusually renter-heavy for its income level
45Cities, towns and villages, with three coterminous town-and-village entities and villages nested inside towns
$30.81Per square foot Class A office asking rent reached in 2026, up 6.4% year on year as tenants compete for transit-adjacent space
987 ftHighest elevation in the county: the northern terrain is why estate cable runs are measured, not estimated
Where we work
Westchester cities and villages
Each of these is a genuinely different building stock. The page for each says how.
White Plains
The county’s only real CBD skyline: Class A towers, turnstiles, destination-dispatch elevators and garage LPR.
New Rochelle
A barbell: 11,500-plus single-family houses and a downtown high-rise pipeline on the Metro-North line.
Mount Vernon
Two-to-six family and small apartment stock, 42.9% owner-occupied, sharing a border and a building type with the Bronx.
Scarsdale
92.3% owner-occupied, no industrial zoning at all, seventeen neighborhoods of Tudor and colonial houses on wooded lots.
The rest of the county
Rivertowns, Sound Shore villages, the Platinum Mile corridor and the northern estate belt, listed in full below.
Corporate
The repositioning of the Platinum Mile is an access control problem
A large share of the single-tenant headquarters buildings along I-287 are being cut up into multi-tenant and mixed-use assets. That sounds like a leasing story. It is actually a rewiring story.
A building designed for one occupier has one badge population, one lobby, one visitor desk and no need to prove where a tenant’s access boundary sits. Split it into six tenancies and you now need per-tenant administrative scopes, separated audit trails, elevator floor restriction, visitor management that six different receptionists can operate, and a landlord credential that opens the perimeter without opening anyone’s suite.
Two things usually get discovered late. First, the legacy readers are 125 kHz proximity: a fixed number transmitted in the clear, cloneable in about fifteen seconds with a sub-$30 device. That is acceptable for a single occupier who knows everyone; it is not acceptable across six tenants and a shared lobby. Second, the elevator integration. On a modern destination-dispatch bank there are no floor buttons in the cab, so access control integrates in software over the network to the elevator controller, which is cleaner than relay banks, but only if the elevator manufacturer’s integration exists and is licensed. That answer needs to be found in week one, not week nine.
Northern Westchester
Estate work in Bedford, Pound Ridge, North Salem and Lewisboro
Multi-acre wooded lots, long driveways, several outbuildings and no conduit anywhere. The design problem is distance and weather.
- Distance kills the default plan. Cat6 carrying PoE is a 100-meter channel, or 328 feet, including patch cords. A gate at the road on a Bedford property is routinely two or three times that. Single-mode fiber with a converter and a small local supply at the gate is the design, not a premium option, and pricing that skips it turns into a change order.
- Gate sensors on an unpaved approach are a maintenance line, not a fault. The external entrapment devices supervise themselves, so a lens under a film of road dust, a bracket knocked by a plow blade or a rodent through the low-voltage wire takes the gate out of service completely. On the dirt and gravel approaches through Bedford, Pound Ridge and North Salem that happens twice a year, reliably, in November and again in March. Mount the eyes clear of the dust plume and the drift line, choose housings that shed debris, and put a seasonal alignment in the plan rather than treating it as a breakdown.
- Power at the gate, and what it does on day three of an outage. Up here the gate is often a quarter mile from the house on a town road with no utility service at that point, so the operator is fed by a trenched circuit or by solar. Either way the question that matters is not whether it opens today but what it does on the third day of an ice storm. Battery capacity sized for a multi-day loss, a manual release the household can actually work in the dark with cold hands, and a decided answer for how a fire truck gets in are design items, not accessories.
- Outbuildings need their own network leg. Barn, guest house, pool house, garage and gatehouse are separate structures with separate power feeds. Each one wants a small hardened switch fed by fiber, not a copper run from the main house that will drop out the first hot afternoon.
- The false alarms up here have four legs. Deer and turkey cross these properties nightly and there are bears in the northern towns. Analytics left on their factory settings will alarm on every one of them, and a system that cries wolf nightly gets muted in its second week. Object classification that actually separates a person from an animal is the difference, and the views that have to be dependable get framed on hard fixed surfaces, the gate, the motor court and the doors, with the wide area views left deliberately unintelligent.
- Trench once, and oversize it. Opening a quarter mile of private drive through stone wall crossings and a culvert is the largest single line on most of these jobs and the one thing you cannot cheaply revisit. So the trench carries more conduit than today’s scope needs, every spare duct keeps a pull string, and the route is documented against fixed features rather than against a tree that will not be there in twenty years. When the pool house wants a camera in 2031, that is an afternoon rather than a machine back on the driveway.
Coverage
Westchester cities, villages and hamlets
Six cities, 23 incorporated villages and the hamlets inside 19 towns. Villages sit inside towns here, so the permit desk is not always the one you expect.
Cities
6 areas- Yonkers
- White Plains
- New Rochelle
- Mount Vernon
- Peekskill
- Rye
Sound Shore & southern villages
14 areas- Scarsdale
- Bronxville
- Tuckahoe
- Eastchester
- Pelham
- Pelham Manor
- Larchmont
- Mamaroneck
- Rye Neck
- Harrison
- Purchase
- West Harrison
- Rye Brook
- Port Chester
Rivertowns & Greenburgh
12 areas- Hastings-on-Hudson
- Dobbs Ferry
- Irvington
- Ardsley
- Ardsley-on-Hudson
- Elmsford
- Tarrytown
- Sleepy Hollow
- Hartsdale
- Edgemont
- Fairview
- Eastview
Central Westchester
12 areas- Valhalla
- Hawthorne
- Thornwood
- Pleasantville
- Briarcliff Manor
- Ossining
- Scarborough
- Mount Kisco
- Chappaqua
- Millwood
- Armonk
- North White Plains
Northern Westchester
15 areas- Bedford Village
- Bedford Hills
- Katonah
- Bedford Corners
- Pound Ridge
- Scotts Corners
- North Salem
- Croton Falls
- Purdys
- South Salem
- Cross River
- Waccabuc
- Goldens Bridge
- Somers
- Yorktown Heights
Northwest & the Hudson
6 areas- Croton-on-Hudson
- Buchanan
- Cortlandt Manor
- Montrose
- Verplanck
- Crugers
FAQ
Common questions
Is our Westchester apartment building held to the same intercom rules as New York City?
No, and this catches a lot of owners who also hold property in the city. The Multiple Dwelling Law provisions that drive so much New York City intercom work (two-way voice with remote door release in Class A multiple dwellings of eight or more apartments erected or converted after 1 January 1968, and the self-closing and self-locking entrance door requirements) are city-scale rules enforced by city agencies. Your Westchester building is inspected against the New York State Uniform Fire Prevention and Building Code plus your own city or village code, by your own building department.
What does not change is the practical obligation. A rental building where the entry door does not latch and the buzzer does not work is a habitability and liability problem in Yonkers exactly as it is in the Bronx, and it is the kind of thing that shows up in a tenant complaint long before it shows up in a code citation. We write scopes to the state code and to whatever your municipality actually enforces, and we say plainly which is which.
Who issues the permit: the county, the town, or the village?
Almost always the municipality. Westchester has 45 cities, towns and villages, and villages sit inside towns, so a Tarrytown address goes to Tarrytown even though it is also in the Town of Greenburgh. Yonkers, White Plains, New Rochelle and Mount Vernon each run their own building departments with their own submission requirements.
The county layer that does exist is trade licensing: Westchester County maintains an Electrical Licensing Board and a Plumbing Examining Board, and states that electricians must hold a county trade license to work in Westchester. Any line-voltage portion of a job (a circuit for a gate operator, a dedicated feed for a head-end) goes to an electrician holding the right ticket. We coordinate that work; we do not perform it, and we will tell you at survey when it is going to be needed.
We are converting a single-tenant building on the I-287 corridor into multi-tenant space. What has to change?
The credential architecture, almost always. A single-occupier building typically has one flat access database and one badge population. Multi-tenant needs administrative scopes so each tenant manages their own people without seeing anyone else’s, separated audit trails for each tenancy, a landlord credential class for perimeter and mechanical spaces, and visitor handling that a small tenant reception can operate without training.
The physical work is usually less than expected and the platform work more. Existing door hardware and wiring often survives; what does not survive is a legacy 125 kHz proximity credential shared across six unrelated companies, and a reader-to-panel link with no supervision. Moving readers to OSDP over RS-485 gives you an encrypted, supervised link that also multi-drops several readers on one cable, which on a repositioned floor plate saves real money against home-running every reader.
Get the elevator answer early. If the bank runs destination dispatch, integration happens in software with the elevator manufacturer and there is a lead time on it.
Our school district wants a controlled vestibule. Where do these usually go wrong?
In the door hardware and the process, not the electronics. The classic failure is a vestibule that is locked correctly during the day and propped open every afternoon because the schedule fights how the building actually runs: deliveries, after-school programs, sports, custodial. A design that does not account for those becomes a door with a wedge under it, which is worse than no system.
The second failure is egress. Anything that electrically locks a door in a path of egress has to release in the ways the code requires, and that is the part where we coordinate with the fire alarm contractor rather than touching the fire panel ourselves. Delayed-egress and sensor-release arrangements are legal in specific configurations and illegal in others, and which one you have is decided by the door’s role in the egress plan, not by preference.
Westchester makes this a wide conversation: the county has an unusually fragmented school landscape, with the Town of Greenburgh alone spanning nine districts, so nine separate sets of decision-makers can exist inside 36 square miles.
Do you work in Putnam, Rockland or Fairfield County?
Our service area is the five boroughs, Nassau and Suffolk, and Westchester. We are not publishing pages for places we are not set up to serve, and Connecticut in particular is a separate licensing jurisdiction from New York for this trade. A New York credential does not carry across the state line, and we are not going to imply otherwise.
If you have a property just over a county line and you are already working with us in Westchester, ask. The honest answer will either be yes with a clear explanation of who is doing what, or a referral to somebody set up for that jurisdiction.
Related
Work that usually comes with this
Access Control Installation
Complete door-control systems, from a single door to a multi-building portfolio.
Gate & Parking Access Control
Vehicle gates, garage doors, parking control and the loops and safeties that go with them.
Apartment Buildings
Walk-ups and elevator buildings, 6 units to 200+, and the law that governs their entry systems.
Security Camera Installation
New IP camera systems for buildings, storefronts, offices and homes.
Elevator Access Control
Floor restriction for co-ops, condos and mixed-use buildings.
Property Management
Portfolio work: one vendor, consistent hardware, COIs on file, documented every time.
Westchester survey, no charge.
Tell us the municipality, the building type and what is failing. We’ll tell you whether it is a service call, a retrofit, or a conversation with your elevator company first.
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