Adding a security bar is a simple, affordable way to make a vulnerable window or sliding door harder to force open. The options in this roundup include adjustable interior bars, multi-bar window grilles, and no-drill designs for renters and homeowners.
We compare size ranges, construction, installation style, and everyday usability so you can choose a dependable security solution without exceeding a $100 budget.
Best 10 Window Security Bars Under 100 Picks for 2026
Permanent Protection Pick
Prime-Line 4-Bar Window Security Grill
- Fixed steel grill for interior windows
- Fits 32 1/2- to 54-inch openings
- Includes tamper-resistant mounting screws
Best For: Wide residential windows needing fixed non-egress protection
Best Adjustable 3-Bar Pick
Prime-Line Adjustable 3-Bar Security Grill
- Fits 23-1/2- to 38-inch openings
- Steel construction with tamper-resistant screws
- Fixed interior guard for security and child safety
Best For: Interior residential windows needing a permanent adjustable guard
Best Decorative Two-Pack
Heavy-Duty Black Window Security Bars
- Two-piece set with eight brackets
- 0.6-inch iron tubes with baked-paint finish
- Decorative design supports security and ventilation
Best For: Exterior-mounted window protection with a decorative appearance
Best Four-Bar Safety Option
Prime-Line Adjustable 4-Bar Security Grill
- Adjusts from 23-1/2 to 38 inches wide
- Four-bar carbon-steel construction
- Includes tamper-resistant screws for interior installation
Best For: Interior windows needing a fixed four-bar safety and security guard
Decorative Heavy-Duty Guard
Black 24 x 36-Inch Window Security Bars
- Thickened iron tubes for a strong physical barrier
- Decorative heart and curved pattern
- Includes two bars and eight brackets
Best For: Homeowners wanting decorative, ventilated window protection
Renter-Friendly Pressure Bar
Adjustable No-Drill Window Security Bar
- Fits 17- to 50-inch sliding tracks
- Installs and removes without drilling
- Rubber feet and lock nuts reduce movement
Best For: Renters and travelers securing sliding windows or doors
Travel-Ready Sliding Bar
17-50-Inch Adjustable Window Security Bar
- Adjusts across 17- to 50-inch openings
- Installs without drilling in about one to two minutes
- Includes multiple extension components
Best For: Portable sliding-window and patio-door security
Flexible Airflow Pick – WooFog Adjustable Window Security Bars
For shoppers comparing window security bars under 100, the WooFog set offers a flexible, tool-free way to help secure double-hung windows, vertical windows, and some sliding doors. Each bar adjusts from 17 to 32 inches and uses rubber feet for a snug, non-scratch fit.
Best For: Homes needing multiple adjustable interior bars for windows or sliding doors, especially where child and pet safety are concerns.
Pros:
- Four bars provide coverage for multiple openings.
- Micro-adjustable length from 17 to 32 inches.
- Tool-free installation with rubber feet and protective end covers.
- Metal construction and a neutral cream-colored finish.
Cons:
- The 17-to-32-inch range may not fit wider openings.
- Measurements should be checked carefully before purchase.
This is a practical choice when you want removable, adjustable protection rather than a permanently mounted grille. Confirm your window or door dimensions and the included bar sizes before ordering.
Wide-Range Value Set – 4-Pack Sliding Door and Window Security Bars
Among window security bars under 100, this four-pack stands out for its broad 17-to-50-inch adjustment range. Its metal bars include anti-slip rubber ends and multiple adjustment holes, making them suitable for differently sized windows and sliding doors.
Best For: Households securing several windows or doors with varying widths, including wider openings up to 50 inches.
Pros:
- Four-pack covers multiple openings.
- Adjusts from 17 to 50 inches for broad compatibility.
- Anti-slip rubber ends help protect frames from scratches.
- Designed for quick, tool-free installation and removal.
Cons:
- The product’s wide adjustment range still requires careful measuring.
- It may be more set than needed for shoppers securing only one opening.
Choose this set if coverage and width flexibility are priorities. The 13 adjustment holes and rotating feet make sizing easier, while the white finish offers a relatively unobtrusive appearance.
Permanent Protection Pick – Prime-Line 4-Bar Window Security Grill
For buyers seeking window security bars under 100 with a fixed installation, the Prime-Line 4-Bar Window Security Grill provides a permanent interior barrier. Its telescoping width fits openings from 32 1/2 to 54 inches and includes tamper-resistant mounting screws.
Best For: Interior residential windows where fixed, non-egress protection is preferred in homes, apartments, or multi-unit dwellings.
Pros:
- Fits openings from 32 1/2 to 54 inches wide.
- Steel square-tube construction with 3 7/8-inch bar spacing.
- Includes one-way tamper-resistant mounting screws.
- Fixed design cannot be quickly opened or removed after installation.
Cons:
- Non-egress design is not intended for quick exit through the window.
- Interior use only and requires permanent installation.
- Local building-code requirements should be checked before installation.
This grill is the strongest fit for shoppers prioritizing a permanently mounted barrier over portability or tool-free setup. Verify dimensions, installation requirements, and egress rules before purchasing.
Portable Rental-Friendly Pick – Gadgetzan 2-Pack Adjustable Security Bars
This two-pack is a useful option for shoppers comparing window security bars under 100 for smaller openings or temporary living spaces. Each bar adjusts from 17 to 33 inches, installs without tools, and can be stored or transported for use in rentals, dorms, hotels, and other locations.
Best For: Renters, dorm residents, travelers, and households securing one or two smaller windows with a portable solution.
Pros:
- Two adjustable bars fit 17- to 33-inch openings.
- Tool-free installation with fine-tuning rubber bases.
- Portable design suits rentals, dorms, hotels, and travel.
- Metal construction and a white finish provide a practical indoor setup.
Cons:
- The shorter range is unsuitable for wider windows or doors.
- Only two bars are included.
- Dimensions should be confirmed before ordering.
Its compact two-pack and portability make this a convenient choice when you do not want permanent hardware. It is especially appropriate for smaller openings, but it should not be selected without checking the available width.
Best Adjustable 3-Bar Pick – Prime-Line Adjustable 3-Bar Security Grill
If you need window security bars under 100 for an interior residential window, this Prime-Line 3-bar grill offers adjustable coverage from 23-1/2 to 38 inches. Its fixed, non-egress design and included tamper-resistant screws make it suited to permanent child-safety and security applications.
Best For: Interior windows in homes, apartments, and multi-unit dwellings where a fixed guard is appropriate.
Pros:
- Adjustable telescoping width fits 23-1/2- to 38-inch openings.
- Durable 0.048-inch plain carbon steel square tubing.
- Includes one-way tamper-resistant installation screws.
- Helps reduce accidental falls while adding window security.
Cons:
- Interior-use only.
- Fixed non-egress design cannot be quickly opened or removed.
- Three-bar design may provide less coverage than the four-bar alternative.
Choose this model when its adjustable range matches your opening and you do not need emergency egress. Confirm measurements and local building-code requirements before installation.
Best Decorative Two-Pack – Heavy-Duty Black Window Security Bars
Among window security bars under 100, this two-piece black set stands out for combining a heavy-duty iron build with decorative heart and curved patterns. It is designed to mount outside the window, provide ventilation, and add a visible barrier against forced entry or accidental falls.
Best For: Bedrooms, living rooms, and children’s rooms where a decorative exterior-mounted two-bar set is suitable.
Pros:
- Two bars are included with eight brackets.
- Thick 0.6-inch iron tubes resist impact and deformation.
- Decorative heart and curved patterns add visual appeal.
- Wing nuts support hand-tightening, with smooth edges for easier handling.
Cons:
- Installation requires mounting the brackets and bars outside the window.
- Additional accessories may be needed.
- Specific window-opening compatibility is not provided in the supplied details.
This set is a practical option if you want two decorative guards and continued airflow. Measure the installation area and confirm that exterior mounting works for your window before buying.
Best Four-Bar Safety Option – Prime-Line Adjustable 4-Bar Security Grill
For shoppers comparing window security bars under 100, this Prime-Line four-bar grill adds a denser fixed barrier while retaining adjustable coverage from 23-1/2 to 38 inches. It is intended for interior windows and includes tamper-resistant screws for a more permanent installation.
Best For: Interior residential windows where added child safety, security, and a four-bar configuration are priorities.
Pros:
- Adjustable telescoping design fits 23-1/2- to 38-inch openings.
- Four-bar configuration provides an added barrier across the opening.
- Made from 0.048-inch white carbon steel square tubing.
- Meets ASTM F2090 testing requirements and select regional code requirements, according to the supplied details.
Cons:
- Interior-use only.
- Fixed non-egress design is unsuitable where emergency escape access is required.
- Window dimensions and local code requirements must be verified before purchase.
This model is a strong fit when you prefer four bars and need an adjustable interior guard. If the window may serve as an emergency exit, select a hinged egress model instead.
Decorative Heavy-Duty Guard – Black 24 x 36-Inch Window Security Bars
If you want window security bars under 100 that provide a permanent-style barrier with a more decorative appearance, this black iron guard is worth considering. Its 0.6-inch-wide tubes, baked-paint finish, and included brackets are designed for DIY installation on either a window frame or wall.
Best For: Homeowners seeking sturdy exterior window protection with airflow, child-safety benefits, and decorative detailing.
Pros:
- Thickened iron tubes create an impact-resistant physical barrier.
- Heart and curved patterns offer a less industrial look.
- Includes two security bars, eight brackets, and installation accessories.
- Allows ventilation while helping restrict access and accidental falls.
Cons:
- Installation is more involved than a no-drill pressure bar.
- The listed dimensions and mounting surface should be checked carefully before ordering.
Choose this model when visual style and fixed-style coverage matter as much as basic protection. The lightweight, wipe-clean finish also makes it manageable for DIY homeowners.
Renter-Friendly Pressure Bar – Adjustable No-Drill Window Security Bar
For shoppers comparing window security bars under 100 for a rental or temporary setup, this adjustable metal bar offers tool-free pressure mounting. It fits sliding doors and windows with tracks from 17 to 50 inches and can be removed without drilling or permanent frame damage.
Best For: Renters, travelers, and families securing sliding doors or windows without making permanent changes.
Pros:
- Adjusts from 17 to 50 inches for many standard tracks.
- Pressure installation requires no screws, drilling, or tools.
- Threaded rubber feet and lock nuts help create a tight, wobble-free fit.
- Internal emergency release allows quick removal from inside.
Cons:
- Designed for sliding tracks rather than fixed exterior window mounting.
- Track width must be measured before ordering.
- The listed version is white, which may not suit every frame.
This is a practical choice when portability and damage-free installation take priority. Its adjustable design and rubber pads make it especially useful for apartments, temporary stays, and sliding patio access.
Travel-Ready Sliding Bar – 17-50-Inch Adjustable Window Security Bar
This adjustable option is a straightforward pick among window security bars under 100 for sliding windows and patio doors. Its painted 1-inch metal construction installs without drilling, adjusts from 17 to 50 inches, and includes extension pieces for accommodating different track widths.
Best For: Apartment residents and travelers who need a portable sliding-door or window safety bar.
Pros:
- Adjustable 17- to 50-inch range suits multiple track widths.
- No-drill assembly and removal can take about one to two minutes.
- Includes a base, cap, latch, telescopic rod, and extension rods.
- Portable design works for travel or use at home.
Cons:
- Requires measuring the window or door width before purchase.
- Primarily suited to sliding tracks, not fixed exterior window installation.
- Supplied details do not specify a separate child-release mechanism.
Consider this bar if quick setup and portability are more important than a permanently mounted guard. The broad adjustment range and included extension components provide flexibility for different sliding openings.
How We Picked the Best Window Security Bars Under 100
We focused on practical security bars priced for budget-conscious shoppers, prioritizing adjustable designs that can fit common window and sliding-door widths. The lineup includes compact bars for smaller openings, wider models reaching approximately 50 inches, and grille-style options with multiple horizontal or vertical bars.
We also considered installation method, grip surfaces, frame compatibility, and ease of removal. Rubber feet or tips can help protect frames and improve traction, while no-drill designs are useful for renters or temporary protection. For permanent installations, verify whether the product is intended for mounting into a suitable frame or wall.
Quick Comparison
| Design | Best for | What to check |
|---|---|---|
| Single adjustable bar | Sliding windows and doors | Length range, tip grip, and locking mechanism |
| Multi-bar window grille | Windows needing broader coverage | Opening size, bar spacing, and mounting hardware |
| Multi-pack bars | Several windows or doors | Quantity, combined cost, and consistent fit |
| Wall- or frame-mount bar | More permanent installations | Surface compatibility and included hardware |
Key Buying Factors for Window Security Bars Under 100
Measure the Opening Carefully
Measure the usable width or height—not just the nominal window size—at several points. Select a bar whose adjustment range comfortably includes the measurement without being fully extended. A close fit usually provides better stability.
Choose the Right Installation Type
No-drill bars are quick to install and remove, making them suitable for renters and frequently used doors. Adjustable grille units may provide broader coverage, but they can require more space and more involved mounting. Outdoor or wall-mounted products need compatible, solid attachment points.
Check Contact Points and Materials
Look for sturdy steel construction, secure adjustment hardware, and rubber feet or tips that resist slipping. Soft contact surfaces can also reduce scratches on painted or finished frames. Avoid relying on a bar that rests against weak trim or loose hardware.
Consider Daily Access
A security device should not interfere with normal ventilation or emergency exit routes. Choose a model that adults can remove or release quickly when needed, and keep escape requirements in mind when securing bedrooms or other occupied spaces.
Who Should Buy Which Window Security Bars Under 100?
Renters and apartment dwellers: Choose a no-drill adjustable bar with rubber tips for straightforward installation and removal.
Sliding-door owners: Select a longer bar with a range that matches the door track, and confirm that the design stays secure when the door is opened and closed.
Homeowners securing several windows: A multi-pack can reduce the per-opening cost, provided each bar fits the intended locations.
Shoppers wanting broader window coverage: A Prime-Line-style multi-bar grille may be more suitable than a single bar, especially for wider openings.
Permanent security upgrades: Consider a heavy-duty frame- or wall-mount design, but confirm the mounting surface and follow the manufacturer’s installation instructions. No bar replaces a properly maintained lock, reinforced frame, or a clear emergency-exit plan.