Basement windows are the softest part of most homes. They sit at ground level, they are often hidden behind shrubs or a low grade, and many were installed with a latch rather than a lock. If you are searching for the best window security bars for basement windows, the short answer is this: a screwed-in steel guard with one-way tamper-resistant screws is the strongest single upgrade you can make, and a hinged or quick-release model is the only sensible choice for any window that doubles as a fire escape.
I have spent a lot of time on this problem, comparing guards across widths from 15 inches to 54 inches, in fixed, hinged, screw-in and no-drill tension formats, and comparing what buyers actually say after living with them. What follows is a straight look at the ten options worth considering in 2026, what each one does well, and where each one falls short.
Two questions come up before any product does. Are window security bars effective? Yes, when they are mechanically fastened into the frame or masonry, because they convert a break-in from a few seconds of levering into a loud, slow, visible job. And can you install bars on an egress window? Only with a quick-release or hinged design, because a fixed guard on a sleeping room window is a code violation and a genuine safety hazard. Both answers shape every recommendation below.
Table of Contents
Top 3 Basement Window Security Bar Picks (October 2026)
Prime-Line 3-Bar Guard 23.5-38 in
- Adjustable 23.5 to 38 inch span
- .048 carbon steel with one-way screws
- Fixed non-egress interior guard
Prime-Line 4-Bar Guard 32.5-54 in
- Wide 32.5 to 54 inch adjustment
- Four-bar carbon steel in matte black
- Interior non-egress installation
ARTOSHIN 6-Pack Tension Bars
- Six bars in one pack
- 19.6 to 35.4 inch spring tension range
- No drilling required
Every Bar Compared at a Glance in 2026
| Product | Specs | Action |
|---|---|---|
| Prime-Line 3-Bar Guard 23.5-38 in White |
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| Prime-Line 4-Bar Guard 32.5-54 in Black |
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| ARTOSHIN 6-Pack Adjustable Tension Bars |
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 John Sterling 8-Bar Guard 24-42 in White |
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 Prime-Line Hinged 4-Bar Egress Guard |
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 Grisham AWG 3-Bar Adjustable Guard |
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 Delmoar Fixed Guard 19 in High 21-38 in Wide |
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 Gadgetzan 2-Pack Adjustable Tension Bars |
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 SecurityMan Extendable Iron Bar 14.25-37 in |
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 Jeacent Adjustable Steel Bar 15.5-29.5 in |
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Why Basement Windows Get Targeted First
Basement windows are the weak point for a simple reason: they are the only openings in most houses that a person can reach from the ground without a ladder. Everything else about them reinforces that. The glass is often single pane and old, the frame is frequently wood, and the original latch was designed to hold a sash closed in a dry room, not to stop a determined person.
Then there is visibility. A basement window set below grade in a well is almost invisible from the street, which means nobody is watching when it is tested. Homeowners on homeowner forums describe the same sequence repeatedly: a window that rattles in the wind, a loose sash, a sill that flexes, and only then the realization that the rest of the house is irrelevant because the lowest opening is the path in.
That is why a layered approach works better than any single product. Window well covers and locked well assemblies remove reach. Laminated or polycarbonate glazing defeats the break-the-glass route. Reinforced frames and tamper-resistant hardware stop frame leverage. And burglar bars for basement windows, properly screwed in, add the mechanical barrier that makes the whole approach too slow and too noisy to be worth it.
One caution on the layering: bars do not replace egress planning. If any basement window serves a bedroom, a finished basement living area or a required escape route, it must stay operable from the inside without a key or special tool.
Fixed, Hinged, Removable or Tension: Which Bar Type Fits
Fixed non-egress guards are the simplest and the most secure. They screw into the casing or frame and do not open. They are the right answer for a storage room, a utility area, or any window where you never need fresh air and never need to leave through it. Every screwed-in guard in this roundup is of this type, and one of them is explicitly labelled not for sleeping quarters.
Hinged egress guards add a pivoting side so the window can be opened and closed while the guard stays mounted. The Prime-Line S 4780 uses a three-step quick release, which lets a person pull the whole guard off in an emergency without tools. This is the only category I consider acceptable on a bedroom window.
Tension-mounted bars are a different product entirely. They wedge between the jambs or sit in a sliding track using a spring, rubber foot or screw knob, so they need no drilling at all. They are fast to install, removable in seconds and renter-friendly. They are also a deterrent rather than a hardened barrier, and a determined intruder who breaks the glass can often push them aside.
Removable screw-in guards sit in the middle. They use real fasteners but come off with a special bit, which is a reasonable compromise in a rental where you want your deposit back at move-out. Within this group, the ARTOSHIN and Gadgetzan packs are tension designs, while the Jeacent bar uses an adhesive strip or optional screw in a sliding track.
Fire Egress Rules to Check Before You Buy
The single most consequential decision in this whole guide is whether the window is an egress window. If it serves a sleeping room or a habitable basement space, code generally requires a net clear opening of at least 5.7 square feet with a minimum width of 20 inches and a minimum height of 24 inches, and it must be openable from the inside without a key, tool or special knowledge.
That is why the fixed guards here carry non-egress language in their own documentation. The Prime-Line three-bar and four-bar models, the Grisham AWG, the Delmoar guard and the John Sterling unit are all described by their manufacturers as fall-prevention or fixed guards rather than escape hardware. The Grisham listing is the most explicit, stating it is not for bedrooms or other sleeping quarters where no alternative emergency exit exists.
Bar spacing matters too, mostly for children. A general rule of thumb used in child-fall prevention is 4.3 inches or less between bars so a child’s head cannot pass through. The spacing in this roundup runs from 2.9 inches on the Grisham guard to 3-7/8 inches on the Prime-Line models, all inside that threshold.
Also check local rules before drilling. The Grisham guard is documented as meeting New York, New Jersey and Oregon Home Builders Association codes, and the Prime-Line hinged unit instructs buyers to consult the local building code or fire department first. Codes vary by region, so verify yours.
How to Measure a Basement Window for Bars
Measurement is where most buyers go wrong, and it is the fastest problem to fix before an order is placed. Measure the clear opening, not the outer casing, and do not measure the sash width as it appears when the window is open.
Step 1: Measure the inside opening at the widest point, from one inner jamb to the other, and write down the smallest of three measurements. Step 2: Measure the inside height from the top of the lower sash to the underside of the upper sash or head jamb, and take the smallest of three. Step 3: Compare those numbers against the guard’s stated adjustment range, which must fully bracket your opening. A guard that only just reaches the opening size is already too tight once paint and trim are factored in.
Step 4: Check the mounting surface. Interior-mount guards attach to the casing or the inner jamb, so the trim must be solid wood or metal and wide enough to hold fasteners. If you are mounting into brick, concrete or stone, you need a hammer drill and masonry bits, plus anchors rated for masonry.
Step 5: For tension bars, measure the track or jamb depth rather than the window width. The Jeacent bar needs a track at least 1 inch wide because the device itself is 1 inch on each side, and that single requirement eliminates it from many older narrow-frame windows.
Standard basement openings are the easiest case. Most fall between 24 and 42 inches wide and 14 to 30 inches high, which is exactly the band covered by the majority of the guards below. If your window is outside that band, count on a trip to a home improvement store with a tape measure and the sash removed.
1. Prime-Line 3-Bar Window Security Grill, 23-1/2 to 38 in, White
Prime-Line 3-Bar Window Security Grill, Adjustable 23-1/2 to 38 in., White
Adjustable 23-1/2 to 38 in
.048 in carbon steel
3-7/8 in bar spacing
Interior non-egress
Pros
- Over a thousand reviews averaging 4.5 stars
- Adjustable span covers most basement openings
- One-way tamper-resistant screws included
- Minimal hardware and fast install
Cons
- Fixed non-egress so the window cannot open
- Interior mount only
- One year limited warranty
This is the guard I keep coming back to. It is a plain three-bar unit in .048 inch plain carbon steel square tubing, telescoping from 23-1/2 to 38 inches, and the build quality matches the spec sheet rather than just the listing photos. The 3-7/8 inch on-center bar spacing is tight enough for child safety and still wide enough that the guard does not read as a cage.
Installation is a drill, a screwdriver and about ten minutes, and the one-way screws do most of the arguing for you afterwards. At 4.5 stars across 1070 reviews it has the largest installed base of any fixed guard in this group, which means replacement parts, spare screws and sizing answers are easy to come by.
Two details deserve attention. The unit is interior-only, so plan how blinds and trim sit before you drill, and the included hardware is minimal enough that several owners add their own structural screws. The warranty is one year limited, which is standard for the category rather than a red flag.
Bar spacing of 3-7/8 inches and a fixed, non-egress design mean this is a storage-area guard. If the window serves a bedroom, step past it to the hinged model further down.
What it fits and what it does not
It fits openings between 23-1/2 and 38 inches wide, which covers the majority of standard basement sashes. It does not fit wide double-hung units above 38 inches, and it cannot be shortened.
Who should buy it
Buy this guard for a utility room, a storage area, a mechanical room or a basement window you never intend to open. It is the highest-confidence choice in the roundup because the rating is high and the review volume is unmatched.
2. Prime-Line Adjustable 4-Bar Window Security Grill, 32-1/2 to 54 in, Black
Prime-Line Adjustable 4-Bar Window Security Grill, Black, 32-1/2 to 54 in.
Adjustable 32-1/2 to 54 in
.048 in carbon steel
4 bars matte black
One-way security screws
Pros
- Widest span of the screw-in guards
- Four bars add coverage at low height
- Rigid steel that installs with a few screws
- Blends visually with white trim
Cons
- Fixed non-egress design
- Security screws need a special bit not included
- Occasional missing hardware in the box
When a basement window is wide, this is the guard that solves the problem the three-bar model cannot. It telescopes from 32-1/2 to 54 inches with four bars instead of three, so the same .048 carbon steel covers a much larger opening and adds a horizontal line of defense across the lower half.
It is also the heavier of the two at 4.41 pounds, which tells you something about how it behaves when someone leans on it. Owners report that it visually disappears against white trim and blinds, which is a meaningful advantage over the boxy guards that make a room look institutional.
The recurring complaint is hardware, and it is worth planning around. Buyers report that the one-way security screws require a special bit that is not in the box, and that heads can round if you use the wrong driver. A few also report incomplete or loose fastener packaging. Buy a pack of one-way screws and the correct bit before you start, not after.
Like its three-bar sibling, this is a fixed non-egress guard for interior use. On a sleeping room window it is the wrong tool.
Where sizing gets tricky
The 32-1/2 inch minimum is the constraint. A 30 inch opening will not take it, and neither will a 40 inch opening on a window with deep trim. Measure the clear opening carefully, not the rough opening in the wall.
Who should buy it
Buy this guard for wide basement windows, sliding-light wells, and any opening where you want more bar coverage than a three-bar unit provides at the same height. It is the better value of the two Prime-Line fixed guards for most homes.
3. ARTOSHIN 6-Pack Adjustable Window Security Bars, 19.6 to 35.4 in
Artoshin 6 Pack Adjustable Window Security Bars – Heavy Duty Steel, Indoor Window Safety Locks for Sliding Windows, 19.6”-35.4” Security Bar for Windows
6 bars per pack
19.6 to 35.4 in adjustable
Spring tension mount
Electrostatic coated steel
Pros
- Six bars cover multiple windows in one order
- Tension mount leaves no holes in the frame
- Coating resists rust and leaves no burrs
- Also works as closet and curtain rods
Cons
- Twist adjustment can bind
- Some bars creep under sustained weight
- Weaker than any screwed-in guard
The practical argument for this pack is arithmetic. Six bars in a single order changes the cost per window when you have a whole basement to cover, and the spring tension design means zero drilling, zero patching and a completely reversible install. That reversibility is the whole point in a rental.
The build is iron and plastic with an electrostatic spray coating that resists rust and leaves no burrs on the contact points. The rubber tips are the detail I appreciate most, because they grip the jamb without scratching the frame, which matters on finished trim.
Where it falls short is exactly where a tension design falls short. Owners report the twist adjustment can be stiff or bind on some bars, and that longer bars can creep or slide over time under weight. This is a deterrent, not a hardened barrier, and it should be the second layer rather than the only one.
Rated 4.2 across 690 reviews, it also picks up heavy-duty multi-use duty, working as closet rods, shoe rack supports and curtain rods.
What it fits and what it does not
Adjusts between 19.6 and 35.4 inches, which covers a standard basement sash but not a wide slider or a window well opening. It needs opposing flat surfaces to wedge against, so it does nothing for a window with a rounded or textured reveal.
Who should buy it
Buy it if you are securing several small windows, if you rent and cannot drill, or if you want a cheap extra layer on top of better glazing. Do not rely on it alone against a determined intruder.
4. John Sterling Fixed Window Guard, 8-Bar, 24 to 42 in, White
John Sterling Fixed Window Guard 8Bar 30×24-42 Inches White
8-bar configuration
Fits 24 to 42 in wide
Powder-coated steel
12.3 lb unit
Pros
- Swings open for cleaning and emergency access
- Heaviest fixed guard here at 12.3 pounds
- Fine bar spacing blocks toddler falls
- Handles a full-grown cat or small dog
Cons
- Bars flex when pushed
- Supplied Phillips screws strip easily
- Padlock hole sits close to the sill
At 12.3 pounds this is by far the most massive guard in the roundup, and the eight-bar layout is the tightest. It is also the only screw-in unit here that swings open for cleaning, which turns an otherwise permanent fixture into something you can actually get a cloth to.
Sized for double hung or awning windows, it covers 24 to 42 inches wide with a maximum height of 30 inches, and the same family comes in 3-bar, 6-bar and 8-bar configurations so you can match density to the risk.
Be realistic about what it is. Owners consistently frame it as a fall-prevention guard rather than a hardened security bar, and they note the bars flex when pushed and the included Phillips-head screws strip, so many replace the hardware with their own. Screw holes can also land near the flange edge or land misaligned.
At 4.2 stars from 372 reviews it is a well-regarded guard with a specific job, not a universal answer.
Why the swing matters more than it sounds
A hinged guard lets you wash the exterior glass and lets a firefighter or paramedic reach the opening without cutting tools. The swing-out action means one person can reposition it, which matters in a window well.
Who should buy it
Buy it for a home with toddlers, a cat that likes to sit on the sill, or a window above a drop where a fall matters more than a forced entry. The heavy steel is the deciding factor for me here.
5. Prime-Line Hinged 4-Bar Window Grill, 31 to 54 in, White
Prime-Line S 4780 21 In., White Painted Carbon Steel, Hinged 4-Bar Window Grill (Single Pack)
Hinged egress design
3-step quick release
Fits 31 to 54 in
White painted carbon steel
Pros
- Only true egress option in the roundup
- Three-step release removes the guard fast in an emergency
- Inside-frame mount leaves exterior trim untouched
- Keeps the window usable while guarded
Cons
- More involved install than a fixed grill
- Bulkier and heavier than fixed alternatives
- Setup takes extra minutes
This is the one I would put on a bedroom window without hesitating. It is a hinged egress guard with a three-step quick release, and the manufacturer’s own instructions start by telling you to check your local building code or fire department before installing. That is exactly the right instinct and exactly the right product class.
Inside-frame mounting means the exterior trim and casing stay untouched, so it does not change the look of the house from outside. The 31 to 54 inch range covers most wider basement openings, and at 4.41 pounds it has real heft.
The cost of that capability is installation time. Hinge hardware plus a multi-step release means a longer setup than a fixed grill, and buyers consistently note that the egress version takes extra minutes to configure. Plan an hour rather than fifteen minutes, and test the release in the dark before you rely on it.
Rated 4.2 from 287 reviews, with praise concentrated on the quick-release mechanism and the white finish.
How the quick release actually works
Three sequential steps, no tools, once the latch is set. That matters because the whole point is that a panicked adult or a child can operate it. Verify the release works with the sash closed and in low light, not only in daylight during installation.
Who should buy it
Buy it for any basement bedroom window, any finished basement egress window, and any opening that an inspector could reasonably call an emergency exit. If code compliance is in question, this is the guard to discuss with your local authority.
6. Grisham AWG Adjustable 3-Bar Window Guard, 22-3/4 to 38-1/2 in
Grisham AWG Fixed Window Security Bars, (Black, 3Bars)14 3/4″ to 15 3/4″ HIGH x 22 3/4″ to 38 1/2″ Wide Adjustable Width Window Safety Guards for Children, Tubular Steel, Rust Resistant
22-3/4 to 38-1/2 in wide
2.9 in bar spacing
Tubular steel
Robotic welded
Pros
- Documented as meeting NY NJ and OR code
- Mounts inside or outside
- 2.9 inch spacing blocks child falls
- Rust-resistant finish with tight robotic welds
Cons
- Non-egress so it cannot be opened or escaped through
- Height range limited to about 14.75 to 15.75 in
- One-way screws need a special bit
The Grisham is the only guard here with published code compliance in the documentation, meeting New York, New Jersey and Oregon Home Builders Association health and safety building codes. At 4.5 stars with 79 percent of reviews at five stars, it also has the highest five-star share of any fixed guard in this group.
Its 2.9 inch bar spacing is the tightest here, and the tubular steel is finished with a rust-resistant coating and robotically welded to keep the joints intact. Unlike most of the screw-in options, it can mount inside or outside, which is useful for a window well you cannot access from the room.
The real limitation is height. At 14-3/4 to 15-3/4 inches it is a short guard, and many basement openings are taller than that. It is also explicitly non-egress and ships with tamper-proof one-way screws, so removal requires a special bit.
Buyers describe it as sturdy, well welded and genuinely attractive for a functional guard, with the non-egress constraint as the main recurring drawback.
When exterior mounting is the right call
If the basement window opens into a window well with no interior access, or if the room side is finished trim you do not want pierced, exterior mounting is the only option. Confirm your local authority accepts it before drilling into masonry.
Who should buy it
Buy it for short basement openings, for homes where a home builders association standard is the reference point, and for child-safety priority over fire-egress concerns. It is a strong pick when the height works.
7. Delmoar Fixed Window Guard, 19 in High, 21 to 38 in Wide, White
Delmoar Fixed Window Safety Guard 19”x 38” Adjustable Width Prevents Accidental Falls, Non-Egress, Tamper Resistant Screws Included, White, Single Pack
Fits 19 in high windows
21 to 38 in wide
3.8 in bar spacing
7.09 lb steel
Pros
- Heaviest build in the roundup at 7.09 pounds
- Highest average rating among the products analyzed
- Adjusts across a range of vertical widths
- Simple drill-and-screw installation
Cons
- Packs often arrive short on screws and end caps
- Non-egress so the window stays shut
- Not for sliding or casement windows
This guard has the highest average rating of anything in the roundup, at 4.6 stars, and at 7.09 pounds it is the second heaviest unit here. Owners describe something that looks and feels like steel rather than thin decorative tubing, which is precisely what you want pressing against a basement window from the inside.
It fits windows up to 19 inches high and 21 to 38 inches wide with 3.8 inch bar spacing, and it is sold in three sizes so you can match the opening rather than forcing a fit. Guards can be installed side by side or stacked for a wider or taller window.
Two limits are clear. It is a vertical-window guard, not for horizontal sliders or hinged casement units. And the most repeated complaint across reviews is incomplete hardware, with several buyers reporting missing screws and white end caps. Check the bag against the parts list before you drill, because a missing fastener means a second trip.
The non-egress designation also applies here, so it is a storage and utility area choice rather than a bedroom choice.
Why weight matters at a basement window
Bar weight is a rough proxy for how hard the guard resists being twisted or levered. Heavier units also stay put under a shoulder or a kick, and they are less likely to rattle in a draft. That is a real advantage over the light tension designs.
Who should buy it
Buy it when you want the sturdiest fixed guard for a standard vertical basement window, and when child-fall protection matters. It is the best-rated product in the set, and the missing-hardware complaint is manageable with one careful check.
8. Gadgetzan 2-Pack Adjustable Window Security Bars, 17 to 33 in
Gadgetzan 2 Pack Adjustable Window Security Bars for Inside, 17-33 Inch
2 bars per pack
17 to 33 in adjustable
No-tool install
Rubber feet and caps
Pros
- Press-button extension needs no tools at all
- Rubber base fine-tunes fit against uneven frames
- Plastic caps and rubber feet prevent frame scratches
- White finish blends into trim
Cons
- Friction-only tension is a deterrent not a barrier
- Can be pried away once glass is broken
- Some creep under sustained pressure
If you rent, this is the shape of answer that works. Press the button to extend, rotate the rubber base for a snug fit, and the bar holds between the jambs with friction and rubber. Nothing is drilled, nothing is painted over, and it comes out in seconds when you move.
The adjustable rubber base is the detail that makes it better than a plain spring bar, because it compensates for uneven frames. Plastic caps and rubber feet keep the contact points from scratching trim, and the white finish blends rather than announcing itself.
Owners treat it as a supplemental layer rather than a standalone barrier, and they are right to. Because it is friction-based, a broken pane plus a pry bar defeats it. It is also portable, so it works in hotel rooms, dorms and rentals as easily as at home.
Rated 4.5 from 248 reviews, with 77 percent at five stars, and 3.03 pounds for the pair.
What friction can and cannot do
Friction bars stop a casual reach-through, a child climbing out and a wind-driven sash. They do not stop a prepared person with a pry bar and ten minutes. Treat any manufacturer force rating with skepticism and plan the second layer accordingly.
Who should buy it
Buy it if you cannot drill, if you move often, or if you want a cheap supplement to better glazing. Two bars cover two windows, so order accordingly.
9. SecurityMan Extendable Iron Security Bar, 14.25 to 37 in, Black
SecurityMan Window Security Bar – Easy Install for Horizontal/Vertical Windows – Adjustable Window Lock Bar (Child Proof/Heavy Duty Iron) – Extendable (14.25″ to 37″) Security Bars for Windows – Black
Extends 14.25 to 37 in
High-grade iron
250 lbs force rating
Anti-lift child lock
Pros
- Only option here that fits vertical and horizontal windows
- Two install methods including a drilled bracket
- Anti-lift lock stops children disabling it
- Installs and removes in seconds
Cons
- Some units break at the extension joint
- Rail mount lacks stand-up support on wide openings
- Light gauge for true forced-entry resistance
Most tension bars in this roundup assume a vertical window with opposing jambs. This one extends from 14.25 to 37 inches and works on both vertical and horizontal sliders, which covers the basement sliding-window case that so many other products simply ignore.
It also offers a choice of installation. Use the drilled mounting bracket for a fixed barrier, or drop it straight into the window rail for a removable one. The anti-lift child lock stops a small child from simply rotating the bar away, which is the standard failure of a tension design.
The 250 pound force rating is a manufacturer claim on high-grade iron, and reviewers are more measured than that number. Some units report breakage at the extension joint within weeks, and the rail-mounted setup has no stand-up support on wider openings, so it can be levered.
At 1.57 pounds it is light by design, and buyers looking for forced-entry resistance would need a heavier gauge option. Rated 4.2 from 181 reviews.
Choosing between the two install methods
Use the drilled bracket when you own the property and want a fixed barrier. Use the rail mount when you rent, or when the window opens often and you want the bar out of the way in seconds. Do not mix the two on the same window.
Who should buy it
Buy it for horizontal sliding basement windows, especially egress sliders where you want the window to open in a fixed position. It is also a good travel and rental bar.
10. Jeacent Adjustable Steel Security Bar, 15-1/2 to 29-1/2 in
Jeacent Adjustable Window Security Bar, Patio Door Lock – Sturdy Steel, Extends from 15 1/2″ to 29 1/2″
Extends 15-1/2 to 29-1/2 in
22 adjustment settings
Spring clip and fine screw
Adhesive or screw mount
Pros
- Largest review base in the set at 1710 reviews
- 22 settings plus a fine-tune screw for exact fit
- Adhesive install needs no drilling on aluminum frames
- Spring clip adds resistance from forced entry
Cons
- Adjustment button can break or fail to spring back
- Wobbles near full extension
- Needs a track at least 1 inch wide
With 1710 reviews averaging 4.5 stars, this bar has the largest installed base of any product analyzed, and the volume reveals a design that mostly works. Twenty-two adjustment settings plus a long fine-tune screw give an unusually precise fit for a sliding track, which is harder than it sounds when frames are out of square.
Installation is tool-free. Sit it in the track, lock the spring clip, and use the long screw to dial in the opening. Adhesive strips secure it to the frame, or you can screw it down. It is a genuinely discreet fit in an aluminum sliding window, which is why it does not look like a security device at all.
Three constraints are real. The adjustment button can break or fail to spring back, extended bars lose stiffness and get slightly wobbly, and the track must be at least 1 inch wide because the device is 1 inch on every side. The manufacturer also states plainly that a determined intruder can defeat it by breaking the glass.
Several owners replaced improvised wood blocking with it, which is the clearest endorsement in the reviews: it is better than the alternative most people were using.
Check the track width first
This is the single most important measurement for this product. If your sliding window track is under an inch, the bar physically will not fit, and no amount of adjustment changes that. Measure before you order, not after.
Who should buy it
Buy it for sliding windows and patio doors with wide tracks, for finished aluminum frames you cannot drill, and for anyone who wants a window partially open for ventilation. It is a deterrent layer, not a hardened barrier.
Installing Bars on Basement Windows
Most of the screw-in guards here need a drill, a screwdriver and the correct bit for one-way security screws. Buy the bit before you begin, because the screws are designed to resist removal from the wrong side and heads can round if forced.
Brick, concrete and stone basement walls need a hammer drill and masonry bits, plus anchors rated for masonry. Wood trim accepts standard screws into solid framing only, so avoid hollow cavities and avoid drywall where a bar can be pushed off the surface. Before drilling into an exterior wall, check for wiring and plumbing.
The recurring homeowner question is whether to hire someone. Professional installation is quoted per window, and the forum consensus is that it is worth it when the wall is masonry, the opening is oversized or the window is a required egress. It is straightforward DIY when the guard lands on wood casing.
Renters and landlords: you generally need written permission before any permanent modification, and a no-drill design is the cleanest way to satisfy both sides. Get the agreement in writing, note the condition of the trim at install, and photograph it.
Alternatives to Security Bars and When to Use Them
Bars are not the only layer, and for some openings they are the wrong one. Laminated or polycarbonate security glazing defeats the break-the-glass route entirely, which is why it is the strongest single answer where appearance matters and a guard would look wrong.
Window well covers and locked well assemblies remove reach from the outside. For a window below grade in a well, this often stops the attempt before a bar would even be tested. Window security film adds meaningful resistance to a break, at a low visual cost, and privacy film can be combined with it.
Reinforcing the sash and frame with structural screws, replacing the original latch with keyed or pin-style hardware, and adding exterior motion lighting all raise the odds of detection. Layered is the operative word: the forum consensus is that well covers first, then glazing or film, then bars, and finally lighting.
My rule: if the window is not an egress window, bars are a strong choice. If it is an egress window, use a hinged or quick-release bar or pick a different layer entirely.
Frequently Asked Questions
How do I burglar proof basement windows?
Layer your approach instead of relying on one product. Start with a locked window well cover so nobody can reach the opening. Next, upgrade the glass to laminated or polycarbonate security glazing, or apply window security film, so a broken pane does not become an opening. Reinforce the sash and frame with structural screws and replace the original latch with keyed or pin-style hardware. Finally, add bars screwed into the frame or masonry with one-way tamper-resistant screws, and pair everything with exterior motion lighting so an attempt is seen rather than completed.
Are window security bars effective?
Yes, when they are mechanically fastened into the frame or surrounding masonry. A properly installed steel guard converts a break-in from a few seconds of levering into a slow, noisy and visible job, which is what deters most attempts. Effectiveness drops sharply with friction-only tension bars that have no fasteners, and drops further if glass can be broken and the bar pried aside. Bars also do not solve an egress problem on their own; any window used as an escape route needs a hinged or quick-release design.
What are the best window security bars?
For a fixed non-egress basement window, the Prime-Line three-bar guard in .048 carbon steel is the highest-confidence pick, with the largest review base and adjustable coverage of 23-1/2 to 38 inches. Wider openings suit the Prime-Line four-bar model at 32-1/2 to 54 inches. Short openings that need documented code compliance suit the Grisham guard. Bedroom egress windows need a hinged design such as the Prime-Line hinged four-bar with a three-step quick release.
What are alternatives to window security bars?
Laminated or polycarbonate security glazing defeats the break-the-glass route and is the best option where appearance matters. Locked window well covers remove outside reach entirely, which is often decisive for a below-grade window. Window security film adds break resistance at a low visual cost and can be combined with privacy film. Reinforced frames, upgraded latches and exterior motion lighting complete the layered approach. These options can also satisfy code where a fixed bar would not.
How do I measure a basement window for security bars?
Measure the clear inside opening, not the outer casing and not the sash. Measure the width between inner jambs at the widest point and the height from the top of the lower sash to the head jamb, then take the smallest of three readings each time. Compare those numbers with the guard’s full adjustment range, which must bracket your opening with room to spare. For tension bars, measure the track or jamb depth instead, since some designs require a track at least 1 inch wide.
The Best Window Security Bars for Basement Windows in 2026
After working through ten guards across every mounting style, the best window security bars for basement windows come down to one question: is the window an escape route or not. If it is not, the Prime-Line three-bar guard is the pick, with the largest review base in the set, adjustable coverage of most standard openings, and tamper-resistant screws that hold up over years of use. Widen the search to the four-bar model for large openings, the Grisham for short openings that need documented code compliance, or the Delmoar for the heaviest fixed build.
If the window is a bedroom or a finished-basement egress, buy the hinged Prime-Line guard with a three-step quick release and test the release in the dark after installing it. If you rent, start with a tension bar and put a second layer behind it.
Whichever you choose, measure the clear opening first, confirm the mounting surface, and check your local code. That ten minutes of preparation is the difference between a guard that fits properly and one that goes back in the box.