The National Fire Protection Association (NFPA) puts it bluntly: some security bars "can trap you in a fire." Safety bars for inside windows only earn the name when they protect the room and still let you out. That is the standard to hold every product to, including ours.

"Safety bars" is a loose phrase. Shoppers use it for security bars, window safety bars, safety grills and the window safety grill. It can describe three different jobs: stopping a break-in, limiting how far a window opens, or guarding a person from a fall. One product rarely does all three. This post focuses on the first job and explains where the other two need a different device.

Bars make sense when a window is easy to reach from outside. Think ground-floor windows, basement windows, a window above a porch roof or a window on a dark side yard. They make less sense on a window you may need as your way out, unless the bars release from inside. The answer depends on the room, the floor and your local code.

Renters have one more step. Read your lease and talk to your landlord before you drill into a frame or a wall. Our page on window bars for apartments covers that conversation. For the wider picture of styles, mounting and trade-offs, start with the window security bars guide.

One note on wording: a safety door bar is a different product with different exit rules. This post stays on windows.

On a window that serves as an escape opening, yes. The 2021 International Residential Code (IRC) requires basements, habitable attics and every sleeping room to have at least one operable emergency escape and rescue opening, with limited exceptions such as a basement used only for mechanical equipment. Boulder County's building publication summarizes these rules. Section numbers change between editions and your city or county may differ, so confirm with your local building department.

The 2021 IRC speaks directly to bars. Section R310.4.4 says bars, grilles, covers and screens over escape openings or area wells must leave the required net clear opening. They must also 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." Section R310.1.1 adds that the opening must be operable from inside "without the use of keys, tools or special knowledge."

The opening itself also has size minimums under the 2021 IRC. Bars must not shrink the opening below them:

• Net clear opening of at least 5.7 sq ft (5 sq ft at a grade-floor window), per R310.2.1.
• Net clear height of at least 24 in and net clear width of at least 20 in, per R310.2.2.
• Bottom of the opening no more than 44 in above the floor, per R310.2.3.
• An area well when the opening is below grade, per R310.4.

This is why you judge fire safety window bars by their release, not by their steel. Never add a key lock, a padlock or a tool-operated fastener to a bar over a bedroom or basement escape window. The NFPA sheet also warns that bars can keep firefighters from getting in to rescue you. For more on how these rules shape product choice, see our window bars and fire code page.

One more limit: nothing here replaces your building official. They decide whether your installed window and bars comply where you live.

No. SWB bars are security bars. They are not child fall-prevention devices, and the 5.25 in bar spacing on Model A does not contain small children or pets. Do not buy them for that purpose, and do not describe them that way to anyone in your home.

The NFPA sheet names better-suited options. It says a window guard or gate, or a window stop or wedge, can keep a child from falling out of an open window. Those products exist for that job. Read what the maker states about the intended use before you buy, and follow the instructions exactly.

There is a tension to respect. A fall guard on a bedroom window still has to let an adult get out in an emergency. Ask the maker how the device releases, and ask your building department if you are unsure. If a device needs a key, a tool or special knowledge to open, it does not belong on an escape window.

A window screen is not a barrier either. Screens keep insects out. They are not built to hold a person or an animal back, so do not count on one.

If you worry about both break-ins and falls, plan for two devices, each chosen for its own job, and check that both allow a quick exit. We cover that side in more depth in our post on window safety guards for children.

SWB sells three models. They differ mostly in mounting and in how, or whether, they release from inside. The table shows the facts SWB lists on its product pages.

Model A uses galvanized steel with electrostatic paint. Width is modular at 16 in per module, so you stack modules for wider windows. SWB lists install at 15 to 30 minutes, but 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.

Model B is the wall-mount option for masonry, stucco and irregular frames. SWB itself says it is not rated for fire code or egress, so use it only on windows nobody would need as an exit.

Model A/EXIT has a 43 in base width that expands with modules. SWB describes it as its egress-compliant model and the only one with a built-in quick-release. That is SWB's description, not a ruling. The building official decides whether your installed window complies.

Do this before you compare prices. A few minutes with the room and the window will tell you which products are even on the table.

• Is the room a bedroom, a basement or a habitable attic? If yes, the window may be a required escape opening.
• Is it the only way out of that room besides the door? If so, treat it as an escape window.
• Does the window open fully, and can an adult climb through it? Check that the opening still works after the bars are in place.
• Is the window below grade? The 2021 IRC then calls for an area well, with a permanent ladder or steps if the well is deeper than 44 in.
• What is the wall made of? Wood frame, masonry and stucco call for different mounting.
• Do you rent? Get written permission before any drilling.
• Is there a working smoke alarm in the room? Fix that first.

The next table turns those answers into a direction. It is a starting point, not a code ruling.

If the window is in a basement, our page on basement window bars goes deeper on wells, grade and wall types.

Bars are one piece of a plan. The NFPA security bar sheet gives clear habits. Find at least two ways out of every room. Make sure every exit, including a barred window, opens easily from inside. Choose bars with quick-release devices. Hold a home fire drill twice a year.

Practice the release itself. Every adult in the household should open it once, in daylight, and know where it is in the dark. A release nobody has tried is a guess.

Smoke alarms come first. The NFPA Smoke Alarms at Home sheet calls for alarms in every bedroom, outside each sleeping area and on every level, including the basement. Test them monthly and replace them when they reach 10 years.

Keep the area around the window clear. Furniture, storage boxes and heavy curtains can slow you down. If you ever have to use the window, nothing should sit between you and it.

Finally, remember who decides. Your building official, not a product page and not this post, decides whether your installed window and bars comply in your area.