Window Fall Prevention and Child Safety

A toddler can climb before they can judge height. An open upstairs window with a bed, a toy chest or a sofa under it is all it takes. This page covers what the evidence says, what the California Residential Code requires, what hardware actually prevents falls, and the separate hazard of blind cords. It is part of our California window guide.

The size of the problem

The U.S. Consumer Product Safety Commission (CPSC) published its most recent figures in April 2026. According to CPSC data, an estimated 5,600 children aged 12 and under were treated in emergency departments in 2024 after falling out of a window, and about one in three of those cases required hospitalization. The agency is also aware of at least 25 deaths among children 12 and under from window falls between 2021 and 2023, and it reports that 80 percent of those deaths happened between May and October.

That seasonal pattern is the one to notice in California. Falls happen when windows are open, and across the Sacramento Valley and the Bay Area, windows are open on warm evenings from spring well into fall. A long-running study in the journal Pediatrics, covering 1990 to 2008, found an average of about 5,180 children a year treated in emergency departments for window falls, with roughly a quarter admitted. The numbers have not moved much in a generation.

A screen is not a safety device

This is the misunderstanding behind a great many falls. A window screen is fine mesh in a light aluminum frame, held in the window by spring clips or tabs. It is designed to stop insects. A child leaning or pushing on it will pop it out of the frame and follow it.

Both the safety regulator and the building code say so in as many words. The CPSC's advice is: "Never depend on screens to keep children from falling out of windows." And the 2025 California Residential Code, in its section on guards, states that insect screening shall not be considered as a guard.

There are purpose-built fall prevention screens, which are a different product tested to a fall prevention standard. An ordinary replacement screen of the kind covered on our window screen replacement page is not one, however sturdy it looks.

What the California Residential Code requires

The code's window fall protection rule is in Section R321.2 of the 2025 California Residential Code, which took effect on 1 January 2026. If you have seen it cited as R312.2, that is the number from earlier editions; Chapter 3 was renumbered.

When it applies

Section R321.2.1 applies in dwelling units to an operable window where both of these are true:

• the bottom of the clear opening is less than 24 inches above the finished floor of the room, and
• that opening is more than 72 inches above the finished grade or other surface below on the outside.

In plain terms: a low window on an upper floor. A low window on the ground floor is not covered, and neither is a second-floor window with a sill at normal height.

What it requires

A window that meets both conditions must comply with one of the following:

1. its openings will not allow a 4-inch-diameter sphere to pass through when the window is in its largest opened position, or
2. it has a window opening control device or fall prevention device that complies with ASTM F2090.

How it fits with fire escape

Bedroom windows often have to serve as emergency escape and rescue openings, covered by Section R319 (formerly R310). The code reconciles the two aims rather than choosing between them:

• Section R319.1.1 expressly permits opening control and fall prevention devices that comply with ASTM F2090 on escape windows. It requires the device to be no more than 70 inches above the finished floor and the release mechanism to be kept operable at all times.
• Section R321.2.2 says that once the device is released and the window fully opened, it must not reduce the net clear opening below the size an escape opening requires.
• For replacement windows, Section R319.5.1 allows the device to be at that height or as low as it can be installed within the existing clear opening.

Does this apply to my existing windows?

Building codes govern work done under them. A house built years ago is not in violation because its upstairs windows have low sills and no devices. The rule comes into play with new construction, additions, and replacement work under a permit, and how it is applied to a like-for-like window replacement is a question for your local building department. California's Existing Building Code also contains fall prevention provisions for replacement windows in dwellings. We ask the jurisdiction rather than assume, and you can read more about permits in do you need a permit to install retrofit windows in California.

Whatever the permit requires, the safety logic does not depend on the paperwork. If there is a low window on an upper floor in a house with small children, fit a device.

ASTM F2090 and window opening control devices

ASTM F2090 is the "Standard Specification for Window Fall Prevention Devices With Emergency Escape (Egress) Release Mechanisms." Its stated purpose is to address falls through open windows by children five years old and younger, and it covers three kinds of product: window opening control devices, fall prevention screens and fall prevention window guards. The current edition is F2090-25; the 2025 California Residential Code references the 2021 edition.

A window opening control device, often shortened to WOCD, is the one most homeowners will meet. It limits how far the sash opens and can be released by an adult to open the window fully. The point of buying a device certified to the standard, rather than improvising, is the release: it lets the window still work as a fire escape.

What to look for:

• A statement of compliance with ASTM F2090 on the device or in the window manufacturer's literature.
• Factory-fitted where possible. Many current sliding, hung and casement windows can be ordered with a compliant device. It is tidier and it is covered by the window warranty.
• An aftermarket device made for your window type. Sliders, hung windows and casements need different hardware.
• Everyone old enough knows the release. Practice it as part of a home fire drill.

The options compared

The escape column matters as much as the fall column. The rules on bars and release mechanisms are covered in window security in California, and escape opening sizes in egress window regulations.

Habits that cost nothing

The CPSC's guidance is short and worth following exactly:

• Install window guards, and choose ones that adults and older children can open easily in case of fire.
• Install window stops so that windows open no more than four inches.
• Never depend on screens.
• Whenever possible, open windows from the top instead of the bottom.
• Keep furniture away from windows to discourage children from climbing near them.

The last one is the easiest to get wrong, because a bed or a window seat under a window is such a natural arrangement. In a small child's room, move the bed.

Choosing windows with children in mind

If you are replacing windows anyway, a few choices make upstairs rooms safer without any add-on:

• Double-hung over single-hung for upstairs bedrooms, because the top sash opens. You can ventilate from above head height with the bottom sash locked. More at why double-hung windows.
• Awning windows where a low opening is needed for air, since they hinge at the top and open on a limited arc.
• Factory opening control devices on any low upper-floor window. Ask for them on the quote.
• Safety glazing where the code requires it. Glass close to the floor may have to be tempered or laminated; see California tempered glass requirements.
• Do not shrink an escape opening. Changing a window style can reduce its clear opening, and a bedroom still needs a way out.

Corded blinds and shades

The other window hazard for small children is not the window but what hangs in it. Children have strangled in the cords of blinds and shades, and the CPSC warns that it can happen in moments, silently, with an adult nearby.

What the law currently says

This area has changed more than once, and a lot of what is online is out of date.

• In force: a federal rule at 16 CFR 1120.3, effective 28 December 2022, treats window coverings that do not meet specified requirements of the industry standard ANSI/WCMA A100.1-2018 as a substantial product hazard. For stock window coverings, the kind sold off the shelf, operating cords must be cordless, short (8 inches or less) or inaccessible. Custom coverings are covered for inner cords and labeling.
• Struck down: a separate, stricter 2022 CPSC rule that would have applied the same operating-cord requirements to custom window coverings was vacated by the U.S. Court of Appeals for the D.C. Circuit on 12 September 2023. It is not in effect.
• Proposed: on 24 September 2026 the CPSC published a proposal to extend the substantial product hazard list to accessible free-hanging operating cords longer than 8 inches on custom coverings. As of this writing it is a proposal, not a final rule.

We did not find a California statute that goes further than the federal rules, and we are not asserting that none exists. If you run a licensed child care or foster home, check your licensing requirements.

What to do at home

None of those rules reaches blinds already hanging in a house. The CPSC's position is simple: cordless window coverings are the only option that eliminates the strangulation hazard. In any room where a young child sleeps or plays, replace corded coverings with cordless ones. Until you can, the agency advises moving cribs, beds and furniture away from cords and keeping cords short and out of reach, and it is explicit that those steps reduce the hazard without removing it.

Blinds sealed between the panes of the window have no reachable cord at all, which is one of their few clear advantages; see smart glass and motorized windows.

Sources

• U.S. Consumer Product Safety Commission: CPSC Urges Families to Protect Children During National Window Safety Week (7 April 2026)
• 2025 California Residential Code, Chapter 3, Sections R319 and R321
• ASTM International: F2090-25, Standard Specification for Window Fall Prevention Devices With Emergency Escape (Egress) Release Mechanisms
• Pediatrics 2011;128(3):455-62: study of children treated in U.S. emergency departments for falls from windows, 1990 to 2008 (PubMed record)
• U.S. Consumer Product Safety Commission: Go Cordless
• U.S. Consumer Product Safety Commission: Window Coverings business guidance (16 CFR 1120.3)
• Window Covering Manufacturers Association v. CPSC, No. 22-1300 (D.C. Cir. 12 Sept. 2023)
• Federal Register, 24 September 2026: Substantial Product Hazard List, proposed amendments for window covering cords

Working with Heritage Exteriors

Tell us if you have young children or a low window on an upper floor, and we will talk through opening control devices and window types with you when we measure. We will also tell you if a window style you like would shrink a bedroom's escape opening. Licensed in California, CSLB #1055919. Call (916) 546-2991.