You open a second-floor window on a warm night, and a thin screen is all that sits between the room and the ground. That is the gap window safety guards for children are meant to address. A guard, a gate, a window stop or a wedge limits how far a window can open, so there is less room for a fall.

The National Fire Protection Association (NFPA) names these options in its security bar safety sheet: a window guard or gate, or a window stop or wedge, can keep a young child from falling out of an open window. That is the extent of what we cite here. We do not quote fall statistics, because we have no official figure to link to, and we will not make one up.

Each option works differently. A window stop blocks the sash from sliding past a set point. A wedge fills the gap under a raised sash. A guard or gate is a frame that sits across the lower part of the opening. Some are fixed in place and some release or fold, and that difference matters a great deal for escape, as the third section explains.

Window guards for home use fit best in rooms where an adult is not always present: bedrooms, playrooms and upper-floor hallways. They do not replace supervision. A screen is also not a safety device for this job, because screens are made to keep insects out, not to hold a person back. Whatever you choose, read the maker's instructions and confirm the product states that it is made to help prevent falls.

If your main worry is break-ins rather than falls, that is a different product category. Our window security bars guide covers it, and the next section explains why the two should not be mixed up.

No. They solve different problems, and mixing them up is a risky mistake.

Window safety guards for children are meant to keep a person from falling through an open window. Security window guards, also sold as security bars, are meant to make forced entry harder. A security window guard can look similar from across the room, yet it is built for a different job.

This applies to SWB's own products. SWB bars are security bars. They are not child fall-prevention devices, and the 5.25-inch bar spacing does not contain small children or pets. If a young child or a pet is the concern, do not rely on any SWB bar for that purpose.

The table below compares the main options. Use it to match the device to the problem, not the other way around.

Interior window guards, meaning guards mounted on the room side of the frame, put a fall guard where adults can reach it. Mounting side alone does not make a product safe or unsafe. The maker's stated purpose and the release method do.

They can, and that is the part buyers skip. A guard that holds a window shut for a young person can also hold it shut for you in a fire. NFPA warns that some security bars "can trap you in a fire" and "can also keep firefighters from getting in to rescue you." It advises finding at least two ways out of every room, and says all exits, including barred windows, must open easily from inside.

The 2021 International Residential Code (IRC) sets the baseline in many places. Section R310.1 calls for at least one operable emergency escape and rescue opening in basements, habitable attics and every sleeping room, with limited exceptions such as a basement used only for mechanical equipment. R310.1.1 says the opening must be operable from inside "without the use of keys, tools or special knowledge."

The same code sets size rules. R310.2.1 requires a net clear opening of at least 5.7 square feet, or 5 square feet at grade floor. R310.2.2 requires a net clear height of at least 24 inches and a width of at least 20 inches. R310.2.3 limits the bottom of the opening to 44 inches above the floor. If the opening is below grade, R310.4 requires an area well. You can read a plain-language summary from Boulder County's emergency escape and rescue openings bulletin.

R310.4.4 covers anything placed over these openings. Bars, grilles, covers and screens over escape openings or area wells must leave the required net clear opening and be "releasable or removable from the inside without the use of a key or tool or force greater than that required for the normal operation of the escape and rescue opening." A fall guard over a bedroom window raises the same question, so ask your local building official how your jurisdiction treats it. Section numbers change between code editions, and local code may differ from the 2021 IRC.

That is why we never suggest keys, padlocks or tools on any guard over a bedroom or basement window. For SWB products, the facts are specific. Model A has no integrated quick-release. Model B is listed by SWB as not rated for fire code or egress, so it belongs only on windows that are not escape openings. SWB describes Model A/EXIT as its egress-compliant model and the only one with a built-in quick-release, operated by hand from inside. The building official decides whether the installed window complies. Our window bars fire code guide goes deeper.

Start with the purpose printed on the product page or box. A window guard from Home Depot, a hardware store or an online seller can be a fall guard, a ventilation stop or a security grille. Stock and models change, so we do not list products here. The checklist works anywhere you shop.

• Does the maker state that the product is made to help prevent falls from windows?
• Does it fit your window type: double-hung, casement, slider?
• Can an adult open or release it from inside quickly, without keys or tools, if the room is a bedroom or basement?
• Does the maker explain how it mounts, and into what: wood frame, vinyl, masonry?
• Is it removable if you rent, and does your lease allow it?
• Do the instructions explain how to test it after installing?

If a product page does not answer these, treat that as a no. A guard you cannot understand is a guard you cannot trust.

The decision table below gives a reasonable first step for common situations. It is a starting point, not a code ruling.

Renters face extra limits. Our page on window bars for apartments explains the landlord and lease questions to settle first.

A guard is one layer. A safer plan has several, and most of them cost little.

Start with smoke alarms, because they buy you time to use your exits. The NFPA smoke alarm sheet says to install alarms in every bedroom, outside each sleeping area and on every level of the home, including the basement. It also says to test them monthly and replace them at 10 years. See the NFPA smoke alarms at home sheet for details.

Next, plan your exits. NFPA's security bar sheet says to find at least two ways out of every room and to hold a home fire drill twice a year. During the drill, open every bedroom window you might use. If a guard or bar makes that hard for you, it will be harder in smoke and darkness.

Then look at the room itself. Keep furniture that can be climbed on away from windows. Keep window locks and stops in working order. Keep cords and small items away from the sill. These steps are common-sense habits, not code requirements, and none of them replaces watching young children.

Finally, recheck after any change. A new bed position, a new guard or fresh paint on the frame can each change how easily a window opens. Make the test part of your twice-a-year drill. If anything sticks, fix it before you rely on it.

They fit the security job, not the fall job. If you want to deter break-ins on ground-floor or other accessible windows, SWB bars may be an option. If you want to keep a young child from falling out of an upper window, use a product made and sold for that.

Model A costs $85 per core module. It telescopes from 35 to 65 inches in height, and width is modular at 16 inches per module, so you stack modules for wider windows. Bar spacing is 5.25 inches. It is galvanized steel with electrostatic paint and can be frame- or wall-mounted. SWB lists installation at 15 to 30 minutes. The manual drills pilot holes and uses the included anchors, so it is not a no-drilling product. It carries a 1-year limited warranty and has no integrated quick-release.

Model B is also $85 per core module, with a height range of 35 to 61 inches. It is wall-mount, aimed at masonry, stucco and irregular frames. SWB itself lists it as not rated for fire code or egress, so it goes only on windows that are not escape openings.

Model A/EXIT is quote only and sold online. SWB describes a 35-inch base that telescopes to 65 inches high, a 43-inch base width expandable with modules, and a hand-operated lift-bolt quick-release from inside while staying rigid from outside. SWB describes it as its egress-compliant model. Compliance of the installed window is the building official's decision. To price a project, request a quote.

If a home needs both a fall guard and security protection on the same window, treat them as two separate questions. Solve the escape and fall question first, with your building official if the window is a bedroom or basement opening, then decide whether a security bar can be added without limiting your exit.