Basement Window Bars Size Guide: How to Measure, Calculate, and Choose the Right Security Bars for Every Opening
Use our complete basement window bars size guide and calculator module to measure, choose, and install the right security bars. Shop SWB models from $90.
SWB: High-caliber Security Window Bars experts. We bring the most advanced protection within your reach, explained clearly. If you have ever stood in front of a basement window with a tape measure wondering exactly which security bars will fit — and whether they will actually keep intruders out while still meeting your local building code — you are not alone. According to FBI Uniform Crime Report data, approximately 60 percent of all residential burglaries occur through ground-floor entry points, and basement windows rank among the top three most commonly exploited openings nationwide. Yet sizing window bars for basement windows size guide module calculator searches reveal that most homeowners have no reliable reference to follow. That gap ends here. This complete guide gives you an actionable size calculator module, measurement instructions, code compliance checkpoints, and a clear product recommendation path so that every basement window on your property — whether in Detroit, Houston, Philadelphia, or Los Angeles — gets the right bar on the first purchase.
The FBI's Uniform Crime Report documents approximately 6.7 million property crimes in the USA every year, with residential burglary accounting for a disproporti…
Why Basement Windows Are the #1 Burglary Entry Point in the USA
Basement windows create a perfect storm of security vulnerabilities that most homeowners dramatically underestimate. They are typically set at or near grade level, obscured by shrubs, utility equipment, or shadows — all of which give a burglar the cover they need to work undetected for the 20 to 60 seconds it takes to force open a standard window latch. According to the Department of Justice National Crime Victimization Survey, roughly 1 in 4 burglaries involves no forced entry at all, meaning unlocked or poorly secured ground-floor windows are literally opened by hand. Basement windows are also structurally smaller than main-floor windows, which causes many homeowners to dismiss them as too tight for a person to pass through. This is a critical miscalculation: the average adult can pass through an opening as small as 6 by 20 inches if sufficiently motivated. Beyond the break-in risk, basement windows in Chicago rental buildings, Atlanta homes near transit corridors, and Los Angeles ground-floor units have been repeatedly flagged by local police departments as priority hardening targets. Installing properly sized window bars for basement windows is the single highest-return physical security investment you can make at the perimeter level — and it starts with understanding how to measure correctly.
Statistics That Demand Immediate Action
The FBI's Uniform Crime Report documents approximately 6.7 million property crimes in the USA every year, with residential burglary accounting for a disproportionate share of losses averaging $2,661 per incident. The Insurance Information Institute notes that homes without visible security hardening — including window bars, reinforced frames, or secondary locks — are up to three times more likely to be selected as targets by opportunistic burglars. In high-density cities like Philadelphia, Memphis, and Chicago, where basement apartments account for a significant share of the rental housing stock, police district reports consistently identify unsecured basement windows as the number one preventable entry vector. The math is straightforward: a $90–$92 steel security bar from SWB pays for itself the first time it turns away a break-in attempt.
Why Window Size Matters for Security Effectiveness
A security bar that does not fit a window correctly provides zero real protection. A bar installed too loosely can be rocked out of position within seconds using a pry bar or even bare hands. Conversely, a bar that is forced into an opening wider than its rated span may lose structural integrity at the mounting points, creating a false sense of security. This is why using an accurate window bars for basement windows size guide module calculator is not optional — it is the foundation of any effective basement security plan. The vertical spacing between bars, the horizontal span, and the mounting depth all interact to determine whether the installation will hold under real-world force. SWB designs its telescopic system with these physics in mind, engineering load tolerances that match or exceed comparable fixed-welded bar systems at a fraction of the cost.
The Complete Basement Window Measurement Guide: Step-by-Step
Before you can use any window bars for basement windows size guide module calculator, you need accurate raw measurements. Basement windows are not standardized the way main-floor windows are — you will encounter casement windows, slider windows, hopper windows, awning windows, and glass-block replacements, each of which has different measurement requirements. This section walks you through the exact measurement protocol that SWB recommends for all residential and commercial basement installations across all 50 states. You will need a metal tape measure (cloth tape can sag and give inaccurate readings), a notepad, and ideally a second person to verify. Take every measurement twice and record both values. If they differ by more than one-quarter inch, remeasure until you achieve consistency.
Measuring Clear Opening Width
The clear opening width is the horizontal distance between the two vertical frame faces — not the outside frame-to-frame dimension and not the sash dimension. Place your tape measure flush against the interior face of the left vertical frame member and extend it to the interior face of the right vertical frame member. Record this number in inches with one decimal place. For example: 28.5 inches. This is your working width. For SWB's Model A Telescopic Window Bars, the product covers 22 to 36 inches clear width, which accommodates approximately 78 percent of all standard US basement window sizes based on IRC framing tables. If your measurement falls outside that range, you will need to evaluate Model B wall-mount configurations or consider a stacked installation.
Width Measurement Adjustment Factor
For telescopic bars that tension against the frame, subtract 0.5 inches from your clear opening measurement to get your target bar setting. This gives the bar enough compression room to bite into the frame without bowing the window sash. Example: 28.5-inch opening → set bar to 28.0 inches.Measuring Clear Opening Height
Height measurement is critical for two reasons: it determines how many horizontal bars you need per window, and it determines whether your configuration will remain egress compliant under IBC Section 1030 and NFPA 101 Chapter 24. Measure from the sill (top of the bottom frame member) to the underside of the top frame member. Record in inches. The International Residential Code requires that egress windows — which include basement bedroom windows — maintain a minimum clear opening height of 24 inches and a minimum clear width of 20 inches. If your basement window will serve as a sleeping area egress point, your bar installation must not reduce the clear opening below these minimums. The SWB Model A/EXIT is specifically engineered to address this requirement with its patented quick-release mechanism.
Height Clearance for Multi-Bar Installations
For windows taller than 24 inches, space bars no more than 5 inches apart vertically (center-to-center) to prevent a child from becoming entrapped between bars — a standard referenced in New York City's Local Law 57 and widely adopted by property managers nationwide. For windows between 12 and 24 inches tall, a single horizontal bar centered at mid-height is typically sufficient.Measuring Frame Depth and Wall Thickness
Frame depth determines whether a tension-mounted telescopic bar can bite adequately, or whether wall anchoring is required. A frame depth of at least 1.5 inches is needed for effective telescopic tension mounting. If your basement window frame is shallower — common in older masonry construction in cities like Detroit, Philadelphia, and Pittsburgh — you will need to switch to SWB's Model B Wall-Mount system, which anchors into the surrounding masonry with heavy-gauge steel brackets. To measure frame depth, place your tape at the outermost face of the window stop and measure inward to the edge of the drywall or masonry surface. Record this in inches. For wall-mount installations, also measure from the window glass face to the nearest solid wall surface to ensure bracket hardware will clear cleanly.
Basement Window Bars Size Calculator Module: Use These Tables Before You Buy
The following calculator module translates your raw measurements into a specific SWB product recommendation. This is the core of our window bars for basement windows size guide module calculator — a structured decision table that matches opening dimensions to the correct model, bar count, and mounting configuration. Use your measurements from the previous section and work through each table in order. No guesswork, no contractor required.
Width Calculator: Which Model Fits Your Basement Window
Use the table below to match your clear opening width to the correct SWB model: Clear Width 14" to 21": Model B Wall-Mount ($91) — custom frame bracket configuration recommended. Contact SWB at securitywb.com/contact/ for a configuration quote. Clear Width 22" to 36": Model A Telescopic ($90) — the telescopic span covers this range natively. Set the bar to (measured width minus 0.5 inches) for proper compression fit. Clear Width 22" to 36" with egress requirement: Model A/EXIT Egress Compliant ($92) — same width range, adds the patented quick-release mechanism required by IBC Section 1030.1 for sleeping areas. Clear Width 37" and above: Two-unit telescopic installation or Model B with extended bracket kit. Two Model A units mounted vertically in tandem can cover windows up to 72 inches wide when center-post anchored. Note: All SWB models are constructed from heavy-gauge steel with a matte black powder-coat finish, rated for residential and light commercial load applications.
Height Calculator: How Many Bars Per Window
Bar count per window is determined by clear opening height and the applicable safety spacing standard. Use the following reference: Height under 12": 1 horizontal bar, centered. Adequate for narrow hopper or awning-style basement windows. Height 12" to 24": 2 horizontal bars, placed at one-third and two-thirds of the total height. Height 24" to 36": 3 horizontal bars. Space evenly. Confirm that egress opening remains minimum 20" wide × 24" tall if this is a sleeping area — use Model A/EXIT only. Height 36" to 48": 4 horizontal bars. This configuration is common in walkout basement windows in suburban Chicago, Atlanta, and Dallas. Height above 48": Custom vertical bar panel recommended. Consult securitywb.com/contact/ for a professional configuration estimate. For all configurations, a maximum vertical spacing of 5 inches (center-to-center) is recommended when children under the age of 10 reside in or have access to the space, consistent with New York City's Local Law 57 and the general guidance of the CPSC.
Egress Compliance Quick-Check for Basement Sleeping Areas
If your basement contains a sleeping area — a legal bedroom, a guest room, or any space routinely used for sleeping — your window bar installation must pass all of the following egress checkpoints before you proceed: 1. Minimum clear width of the operable opening: 20 inches (IRC Section R310.2.1) 2. Minimum clear height of the operable opening: 24 inches (IRC Section R310.2.2) 3. Minimum net clear opening area: 5.7 square feet for above-grade openings, 5.0 square feet for grade-level (IRC Section R310.2.3) 4. Maximum sill height above floor: 44 inches (IRC Section R310.2.4) 5. Quick-release mechanism on bars: required under IBC Section 1030.5 and NFPA 101 Section 24.2.7 — bars must release without keys, special knowledge, or separate tools Only SWB's Model A/EXIT satisfies all five checkpoints with its patented telescopic-plus-egress release system. This is the only SWB model that should be installed on basement sleeping area windows where egress compliance is legally mandated.
SWB Product Breakdown: Matching the Right Bar to Your Basement Window
Security Window Bars offers three distinct models, and basement installations involve unique considerations that make product selection more nuanced than a standard main-floor window. The combination of masonry construction, moisture exposure, egress requirements, and varied window types in typical basement environments means that selecting the right model from the outset saves both money and future compliance headaches. Below is a complete breakdown of each model as it specifically applies to basement installations.
Model A — Telescopic Window Bars ($90): Best for Standard Basement Casement Windows
The Model A Telescopic Window Bar is the ideal solution for basement casement, slider, or hopper windows measuring between 22 and 36 inches in clear width. Its fully telescopic steel design requires no drilling in most frame configurations, making it particularly valuable for renters in basement apartments in cities like Chicago, New York, and Los Angeles who cannot modify the property but need genuine burglary protection. Installation takes 15 to 20 minutes with no special tools. The matte black powder-coat finish resists the higher humidity levels common in basement environments. For landlords managing multiple rental units with basement windows, Model A represents the most cost-efficient per-unit security investment on the market — at $90 per bar, it delivers equivalent stopping power to professionally welded bars that would cost $600 to $1,800 installed. Visit the complete product page at the Model A product listing to review full specifications and ordering options.
Model B — Wall-Mount Window Bars ($91): Best for Masonry Basement Walls
Older homes in Philadelphia, Detroit, Pittsburgh, and similar rust-belt cities typically feature basement windows set directly into poured concrete or cinder block walls with minimal or no wood framing around the window opening. In these cases, a tension-mounted telescopic bar cannot achieve adequate purchase — the bar needs to anchor into the surrounding masonry. Model B Wall-Mount Window Bars are designed specifically for this application. Heavy-gauge steel construction with anchor-ready bracket plates provides a permanent installation that is structurally equivalent to a professionally welded security grille. The powder-coated black finish withstands the condensation and temperature cycling common in basement environments. Model B is also the preferred solution for ground-floor commercial basement windows in retail or storage applications where maximum tamper resistance — rather than removability — is the priority.
Model A/EXIT — Egress Compliant Bars ($92): Mandatory for Basement Bedrooms
If any basement window serves a sleeping area, Model A/EXIT is not a recommendation — it is a legal requirement in virtually every US jurisdiction that has adopted the International Building Code or IRC. The patented quick-release mechanism allows a sleeping occupant to open the bar assembly from inside without keys, tools, or special knowledge — critical during a fire when seconds determine survival outcomes. According to NFPA, an estimated 2,770 people die in home fires annually in the USA, and a significant proportion of fatalities occur when occupants cannot escape through windows. The Model A/EXIT addresses this life-safety gap while simultaneously providing anti-burglary steel bar protection. It covers the same 22-to-36-inch clear width range as Model A and installs in the same 15 to 20 minute window — no contractor required. Review the full egress compliance specifications at the Model A/EXIT product page.
Installation Guide for Basement Window Bars: Step-by-Step With Pro Tips
A correctly sized bar installed incorrectly still fails. Basement installations present specific challenges — floor-level access angles, tight clearances, masonry anchoring, and moisture management — that differ from main-floor window bar installation. This section provides a practical installation walkthrough applicable to all three SWB models, with basement-specific notes at each step. For the complete illustrated installation guide, visit securitywb.com/installation/.
Pre-Installation Checklist for Basement Windows
Before you begin installing window bars for basement windows, complete this pre-installation checklist: 1. Confirm your bar model matches your clear opening width (use the calculator module above). 2. Verify egress compliance if the window serves a sleeping area — only Model A/EXIT is permitted in that application. 3. Clean the window frame with a dry cloth. Debris and paint chips reduce tension-mount effectiveness. 4. Check for lead paint on pre-1978 frames — a common condition in basement windows of older homes in Chicago, Baltimore, and Detroit. If present, use a damp cloth and wear an N95 mask during frame preparation. Do not sand. 5. Confirm that the window fully opens and closes before installing the bar — bars should not interfere with normal window operation on operable units. 6. For Model B wall-mount installations, confirm anchor bolt compatibility with your specific masonry type (poured concrete, block, or brick) and use appropriate anchor hardware rated for your wall material.
Model A Telescopic Installation: Basement-Specific Steps
Step 1: Collapse the telescopic bar to its minimum width. Place it horizontally inside the window frame opening at the desired height (see height calculator above for correct positioning). Step 2: Extend the telescopic mechanism until both end caps make firm contact with the left and right frame faces. You should feel moderate resistance — not forcing, but solid compression. Step 3: Lock the telescopic mechanism at the set width using the integrated locking collar. Tug the bar firmly in all directions to confirm it does not shift or rotate. Step 4: If installing multiple bars in a taller basement window, work from bottom to top. Each bar is independent, so install the lowest bar first, then work upward. Step 5: Perform a physical load test by applying steady outward pressure at the bar midpoint. The bar should show zero deflection greater than one-quarter inch under hand pressure. If the bar deflects more than this, re-extend the telescopic mechanism to increase compression.
Basement Moisture Management Note
Basement environments can accumulate condensation on steel surfaces. SWB's powder-coat finish provides significant corrosion resistance, but for particularly humid basements in Gulf Coast states like Louisiana and Florida, applying a thin coat of paste wax to the bar exterior once per year will extend finish life considerably.Model B Wall-Mount Installation: Masonry Basement Considerations
Model B installations in masonry basement walls require a rotary hammer drill (standard hammer drills lack the impact energy for clean holes in concrete) and appropriate masonry anchors rated for shear loads of at least 500 lbs per anchor point — consistent with OSHA general duty clause standards for security hardware. Mark anchor points at least 3 inches away from any window frame corner to avoid cracking the masonry around the opening. Use a level to confirm bracket plates are plumb before drilling. Once anchors are set, mount the bracket plates and hang the bar assembly. Torque all fasteners to the manufacturer's specified value — typically 25 to 35 foot-pounds for 3/8-inch anchor bolts in concrete.
Sealing Anchor Penetrations in Basement Walls
After installation, seal each anchor penetration with a paintable hydraulic cement or waterproofing caulk rated for below-grade applications. This prevents moisture infiltration through anchor holes — a common cause of anchor degradation and interior water intrusion in basement installations in the Great Lakes region and the Pacific Northwest.Building Code Compliance for Basement Window Bars Across Key US Markets
Building codes governing window bars are not uniform across the USA — they vary by state, city, and property type. Understanding which codes apply to your specific basement window installation is essential before you buy, because a non-compliant installation may need to be removed or modified at your expense. This section covers the most significant code frameworks and their practical implications for basement window bar sizing and selection.
IBC, IRC, and NFPA 101: The Three Federal-Level Code Frameworks
The International Building Code (IBC) Section 1030 and the International Residential Code (IRC) Section R310 both address emergency escape and rescue openings. For basement windows in sleeping areas, these codes establish the minimum clear opening dimensions (20 inches wide × 24 inches tall, with a net area of 5.0 to 5.7 square feet depending on grade relationship) and require that any security bars covering those windows include a quick-release mechanism operable from inside without keys or tools. NFPA 101 Life Safety Code Chapter 24 mirrors these requirements and extends them to multi-family occupancies. OSHA General Industry Standards reference similar requirements for commercial basement spaces used for sleeping or rest by workers. SWB's Model A/EXIT satisfies all three frameworks simultaneously — it is the only bar in the SWB lineup that does so.
City-Specific Rules: NYC, Chicago, LA, and Houston
New York City enforces Local Law 57, which mandates that window guards be installed in any apartment where children under age 10 reside, with bar spacing not to exceed 4.5 inches. Basement apartments in NYC's vast rental stock — particularly in Brooklyn, the Bronx, and Queens — must comply with this ordinance. Chicago's municipal code requires that egress windows in basement sleeping areas meet IBC minimums and that any window bars on those openings include a readily operable release mechanism. Los Angeles's Title 24 building standards align with IBC egress requirements and additionally require that any window bar installation in a fire-rated assembly be reviewed by the local fire marshal. Houston follows Texas state building code, which adopts the IRC for residential construction — making Model A/EXIT compliance straightforward for Harris County homeowners. When in doubt about local requirements, contact your city's building department or use SWB's contact form at securitywb.com/contact/ for guidance.
Cost Comparison: DIY Window Bars vs Professional Installation for Basement Windows
One of the most common questions SWB receives from homeowners and renters preparing to secure basement windows is whether DIY installation of security bars is as effective as hiring a professional locksmith or ironwork contractor. The short answer is yes — when you use the correct bar for the correct opening size, DIY steel security bars provide equivalent physical stopping power at dramatically lower cost. This section breaks down the realistic cost landscape to help you make an informed decision.
What Professional Basement Window Bar Installation Actually Costs
According to HomeAdvisor national cost data, professional window bar installation ranges from $600 to $1,800 per window when a licensed ironwork contractor fabricates and installs welded security grilles. In major metropolitan markets — New York, San Francisco, Chicago, and Boston — those figures are routinely higher, with some contractors quoting $2,500 or more for basement window grille work involving masonry anchoring. Material costs alone for custom-fabricated iron grilles average $200 to $500 per opening before labor. Lead times for custom fabrication typically run two to six weeks. In contrast, SWB's ready-to-install models are priced between $90 and $92, ship via Amazon FBA with Prime delivery available to all 50 states, and install in 15 to 20 minutes without professional help. For a homeowner with four basement windows, the SWB DIY approach saves $2,000 to $7,000 compared to professional installation while achieving the same structural security outcome.
The Renter's Advantage: Why Removable Bars Win for Basement Apartments
The US Census Bureau's 2023 American Community Survey documents 44.1 million apartment renters in the USA, a significant portion of whom occupy ground-floor or basement units. For renters, permanently welded security bars create a costly dilemma: most lease agreements prohibit permanent modifications, and even where landlords permit them, renters cannot take welded bars with them when they move — losing the entire investment. SWB's Model A Telescopic Window Bar solves this problem completely. Because it installs without drilling in most frame configurations, renters can install it on day one and remove it on move-out day without leaving any trace. This portability also makes SWB bars ideal for Airbnb hosts and short-term rental operators who need to secure basement windows between guest stays without modifying the property structure.
Frequently Overlooked Basement Window Security Scenarios
Beyond the standard installation and sizing considerations, several specific basement window scenarios require additional planning. This section addresses the edge cases that frequently trip up homeowners and property managers who have handled standard installations before but encounter a configuration that does not follow the typical rules.
Egress Window Wells: Bars, Covers, and Code Interaction
Basement windows installed in below-grade window wells present a dual security and drainage challenge. The window well creates a recess that can collect debris and water, and it also creates a concealed working space where a burglar can operate entirely out of street-level view. Security bars are essential for window well windows, but the bar must be compatible with the window well cover — a separate plastic or steel cover that keeps debris and water out. Ensure that your SWB bar installation does not interfere with the window well cover's ability to open from inside during an emergency. For egress-rated window wells under IBC Section 1030.4, the well must have interior dimensions of at least 36 inches × 36 inches, and any bars on the window must be openable without special knowledge or tools. Model A/EXIT is the only SWB model appropriate for egress window well applications.
Glass Block Basement Windows: Can You Add Security Bars?
Glass block windows are popular in basement applications because they admit light while providing inherent impact resistance. However, glass block panels are not infinitely secure — a sustained strike with a heavy tool can shatter individual blocks. Adding a security bar layer in front of a glass block basement window is a viable hardening strategy, but it requires a wall-mount approach since glass block installations have no traditional frame to tension against. SWB's Model B Wall-Mount is the correct product for this application. Anchor the mounting brackets into the surrounding masonry frame, leaving a two-inch standoff gap between the bar and the glass block surface to prevent vibration-induced stress fractures in the glass block mortar joints. This configuration is common in Chicago's bungalow-belt neighborhoods and in similar older housing stock across the Midwest.
🏆 Conclusion
Securing basement windows is one of the highest-impact perimeter security decisions an American homeowner, renter, or property manager can make — and getting the sizing right is what separates a genuine security upgrade from a false sense of protection. This window bars for basement windows size guide module calculator has given you the measurement protocol, decision tables, product matching framework, code compliance checkpoints, and cost comparison data you need to move forward with confidence. Security Window Bars (SWB) builds its telescopic and wall-mount systems specifically to meet the real-world conditions that basement windows present: masonry frames, egress requirements, renter-friendly no-drill installation, and durable finishes that hold up in humid underground environments. From a single basement casement window in a Detroit rental to an eight-unit walkout basement retrofit in suburban Houston, SWB's three-model lineup — Model A at $90, Model B at $91, and Model A/EXIT at $92 — covers every sizing scenario covered in this guide. The next step is measuring your windows using the instructions above, matching your measurements to the correct model, and ordering through Amazon for fast nationwide delivery. Your basement windows should not be the easiest decision a burglar makes tonight.
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Ready to secure your basement windows with the right size bars? Security Window Bars ships fast across all 50 states via Amazon. Shop All SWB Models on Amazon → | Model A Telescopic ($90) | Model A/EXIT Egress Compliant ($92) | Model B Wall-Mount ($91) — or visit securitywb.com to get a sizing consultation.
Shop on Amazon →Frequently Asked Questions
Standard basement window sizes in the USA vary significantly depending on the age and construction type of the home. The most common widths range from 24 to 36 inches, and heights typically run from 12 to 24 inches. Older masonry construction in cities like Detroit, Chicago, and Philadelphia often has smaller openings — sometimes as narrow as 14 to 20 inches wide. Newer construction following IRC egress requirements must maintain a minimum clear opening of 20 inches wide by 24 inches tall in sleeping areas. Always measure your specific window rather than assuming a standard size, because even homes built in the same year and neighborhood can have meaningfully different basement window dimensions.
Yes, but only if you use a bar system that includes a quick-release mechanism operable from inside without keys, tools, or special knowledge. The International Building Code Section 1030.5 and NFPA 101 Chapter 24 both require this for any security bars installed over required egress openings, which include basement bedroom windows. SWB's Model A/EXIT is specifically engineered to meet this requirement with its patented quick-release system. Installing a fixed or telescopic bar without a release mechanism on a basement egress window is a code violation and a life-safety hazard that can result in fines, failed inspections, and — most critically — preventable fatalities in a fire emergency.
Use a metal tape measure to capture three key measurements: (1) Clear Opening Width — measure horizontally between the interior faces of the left and right frame members. (2) Clear Opening Height — measure vertically between the top of the sill and the underside of the top frame member. (3) Frame Depth — measure from the outermost face of the window stop inward to the wall surface. Take all measurements twice and record to the nearest one-tenth of an inch. For telescopic tension-mount bars like SWB's Model A, subtract 0.5 inches from your clear width measurement to get the correct bar setting. If your frame depth is less than 1.5 inches, switch to a wall-mount configuration using SWB's Model B.
All window bars reduce light transmission to a small degree, because the bar material itself blocks a portion of the window area. For SWB's horizontal bar designs, the actual light reduction is minimal — typically 5 to 15 percent depending on bar count and spacing — because most of the window opening remains unobstructed. The matte black finish does not reflect glare back into the room. In basement environments where natural light is already limited, the correct approach is to maximize bar spacing (while staying within the 5-inch safety limit for child protection compliance) and to ensure any non-egress basement windows use the minimum number of bars necessary to meet the 5-inch spacing requirement for your specific window height.
This depends on your lease agreement and local law. In most US states, renters may install temporary security measures that do not permanently alter the property. SWB's Model A Telescopic Window Bar installs in most configurations without drilling, making it legally permissible in the vast majority of rental situations — renters simply remove it when moving out, and the property is left unmodified. However, if your basement window is an egress window (a sleeping area), any bar you install must include a quick-release mechanism (Model A/EXIT) to comply with IBC and local fire codes — and some jurisdictions require landlord notification or approval before installation. Always review your lease and check with your building department. NYC's Local Law 57 actually requires landlords to provide window guards in units with children under 10, shifting the obligation to the property owner.
The number of horizontal bars required depends on your window's clear opening height and the applicable safety spacing standard. For windows under 12 inches tall, one bar centered at mid-height is sufficient. For heights between 12 and 24 inches, install two bars placed at one-third and two-thirds of the total height. For windows 24 to 36 inches tall, three bars spaced evenly is the standard configuration. For windows above 36 inches, four or more bars are typically required. In all cases where children under age 10 have access to the space — consistent with NYC Local Law 57 and CPSC guidance — bars should be spaced no more than 5 inches apart center-to-center, which will determine the minimum bar count for taller windows regardless of the general sizing guidelines.
The cost difference is substantial. According to HomeAdvisor national data, professional ironwork installation of security grilles on basement windows costs between $600 and $1,800 per window, with custom fabrication lead times of two to six weeks. In high-cost markets like New York, San Francisco, and Boston, quotes above $2,500 per window are common. SWB's DIY models range from $90 to $92 per bar and install in 15 to 20 minutes without a contractor. For a home with four basement windows, the DIY approach saves $2,000 to $7,000 compared to professional installation while delivering equivalent steel construction strength. SWB bars ship via Amazon FBA with Prime-speed delivery to all 50 states, so there is also no waiting period.
Yes, but you need to use SWB's Model B Wall-Mount rather than the telescopic Model A, because glass block panels have no traditional wood frame to tension against. For glass block installations, anchor the Model B mounting brackets into the surrounding masonry frame — not into the glass block mortar joints, which are not rated for shear loads. Leave a two-inch standoff gap between the bar assembly and the glass block surface to prevent vibration-induced stress on the mortar joints over time. This configuration is particularly common in older Midwest housing stock — Chicago bungalows, Detroit craftsman homes, and Cleveland row houses — where glass block basement windows were a standard construction feature from the 1930s through the 1960s.