New York City Health Code §131.15 (the “window guard law”) requires owners of multiple dwellings — buildings with three or more apartments — to install approved window guards in every window of an apartment where a child ten years old or younger lives, and in the public hallways of that building, and to install them in any apartment where a tenant asks for them regardless of children. The guard must be a Health Department-approved model, fitted so that no opening exceeds 4½ inches, and it may not be fitted on a window that is a fire-escape exit or the only second means of egress in a room. Owners must send the annual notice asking tenants whether children live in the apartment. Tenants may not remove guards; owners may not refuse them. Air-conditioner openings need a permanent bracket that leaves no gap over 4½ inches. Casement, tilt-and-turn and other non-double-hung windows meet the rule with an approved limiting device instead of a bar guard — the rest of this page explains which device fits which window.
New York City Health Department requirements for window fall prevention — guards, limiting devices and opening controls with emergency release.
Window guards in New York City are regulated by the Department of Health and Mental Hygiene, under Article 12 of the Health Code and New York City Administrative Code §27-2043.1. They are a public health measure, not a product choice, and the rules are specific.
In a multiple dwelling — a building with three or more apartments — the owner must provide, install and maintain approved window guards in any unit where a child ten years of age or younger resides, and in the public areas of such a building.
The obligation is broader than most owners realise. An owner must also install guards on the written request of any tenant or occupant, whether or not a child lives there, and whether or not the law would otherwise require them.
Owners must send tenants an annual notice between 1 and 16 January asking whether a child ten or under lives in the apartment. HPD treats missing or improperly installed guards as Class C immediately hazardous violations.
An approved guard or limiting device must:
Prevent the window opening more than 4½ inches in any direction. That applies to the gap at the bottom and sides of an open sash and to the spacing between bars. There must never be more than 4½ inches of unguarded open space.
Withstand the impact of a 150-pound weight and keep its structural integrity after testing.
Carry a stamped Department of Health registration number. If there is no approval number on the device, it is not an approved device.
Be permanently attached to the window frame — not to the sash — and installed with one-way screws so it cannot simply be removed.
Be made of durable, corrosion-resistant material.
Manufacturers are required to print a warning on their instructions stating that using a guard or device to allow a window to open more than 4½ inches is dangerous and illegal. That is the standard to hold an installation to.
This matters as much as where they are required, because a guard in the wrong place blocks an escape route.
Windows giving access to a fire escape. Fixed guards are prohibited here.
Emergency escape and rescue openings, and a first-floor window that is a required means of egress from the unit.
Windows at or below ground level with a drop of less than six inches.
Windows with a permanently and safely installed air conditioner, provided the installation leaves no opening greater than 4½ inches. Where a tenant installs a unit, the owner must inspect it to confirm that.
Both satisfy the requirement. Which one applies depends on the window.
A guard is a fixed metal grille bolted to the window frame across the lower opening, with vertical and horizontal bars. It is the familiar device, and the Health Code sets out specifications for traditional guards in double-hung windows specifically.
The dimensional rules apply in three places, all of which have to be checked at installation: between the vertical bars and the sides of the window frame, between the lowest horizontal bar and the window stool, and between the bars themselves. None may exceed 4½ inches.
Because a guard is fitted across the lower sash opening, the upper sash of a double-hung window can still be opened for ventilation above it — which is why double-hung windows suit guards better than most types.
A casement, slider, tilt-and-turn, awning, project-out or hopper window cannot take a traditional grille sensibly. For these, Health Department-approved limiting devices with an imprinted approval number must be installed in pairs, preventing the window opening more than 4½ inches in any direction.
Note the requirement for pairs. A single device on a wide sash is not compliant.
There is a third category worth understanding, governed by the voluntary standard ASTM F2090. These restrict opening to about four inches, require either more than five pounds of force or a deliberate two-step action to disengage — so a young child cannot release them — and then allow the window to open fully within five seconds for an adult escaping in an emergency.
That last property is the point. It is what allows fall protection on a window that also has to serve as a means of escape, which a fixed guard cannot do.
A double-hung window can take either. A traditional guard across the lower opening is the common answer in apartment buildings. A limiting device restricting the lower sash to a few inches is the alternative where a grille is unwanted, and on an escape window a device with an emergency release is the only option that satisfies both requirements at once.
Insect screens are not window guards. The Health Department says so explicitly. A screen will not hold a child's weight and was never designed to. This is the single most dangerous misunderstanding on the subject.
Fixing into the sash instead of the frame. A guard must be attached to the frame. Fixed to a sash, it moves when the window moves and the protection is illusory.
Fitting a guard to a fire escape window. Well-meant and prohibited. That window is somebody's escape route, and the correct device there is a limiter with an emergency release.
These describe the kind of work each area brings rather than any specific client project.
Pre-war apartment buildings — the Bronx, upper Manhattan, central Brooklyn. Double-hung throughout, frequently with fire escapes, which means guards on most windows and limiters with emergency release on the fire escape openings. Getting that distinction right across a whole building is the job.
Post-war and modern apartment stock — Co-op City, Riverdale, Bay Ridge, Forest Hills. Sliders and casements, which means approved limiting devices in pairs rather than grilles.
Newer Manhattan buildings with tilt-and-turn windows. Limiting devices, and worth noting that the tilt position alone is not a substitute for an approved device.
Whole-building compliance programmes — citywide. Where an owner or managing agent needs the whole stock brought into compliance, the survey identifies window types by pattern and we specify the correct device for each. Buildings rarely have one window type throughout.
If you are an owner or managing agent and need a building assessed, call 929-235-1233. We work across Manhattan, Brooklyn, Queens, the Bronx and Staten Island, and throughout Northern New Jersey, the Jersey Shore, Philadelphia and the Lehigh Valley.
This page summarises requirements as we understand them and is not legal advice. Owners and managing agents should confirm current obligations with the Department of Health and Mental Hygiene and HPD.
Health Code section 131.15: owners of buildings with three or more apartments must install approved window guards in apartments where a child ten or under lives, in public hallways, and on request from any tenant, fitted so no opening exceeds 4.5 inches.
The building owner or landlord, at the owner’s expense. Tenants must allow installation and may not remove guards.
Yes, but a bar guard does not fit them. They are made compliant with a Health Department-approved limiting device or opening-control device that restricts the opening to 4.5 inches, with the emergency release the code allows.
Windows that open onto a fire escape, and windows that are the only second means of egress from a room. Those get a limiter that can be released, not a fixed guard.
The Health Code covers multiple dwellings of three or more units, including co-op and condo buildings; one- and two-family houses are not covered, though guards are still advisable where small children live.
Yes. We supply Health Department-approved guards for double-hung windows and approved limiting devices for casement, awning and tilt-and-turn units, and fit them as part of a window installation or as a stand-alone job.
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