Window security: the complete guide

Why windows matter less than expected, and more than expected

Canadian public data does not reliably publish a Quebec-specific door-versus-window entry split. Police and insurer guidance still treats accessible ground-floor and basement windows as a major residential exposure^[1]. Windows have a specific failure mode: once a ground-floor window is breached, the intruder is inside and past the deadbolt. Doors delay entry attempts. Windows delay entry completions after a door has held.

The three things that matter

1. Every window locks and the lock engages. Ground-floor and basement latches are often broken, painted over, or simply left undone. Each one should be checked.
2. Ground-floor and basement glass holds together after impact. This is the role of 8-mil security film with edge attachment — not preventing breakage, but preventing instant breach.
3. The window can be seen. A window visible from the street or from a neighbour's line of sight ends most opportunistic attempts before they begin.

The three-tier upgrade path

Free to $50

Walk every ground-floor and basement window. Verify the latch engages and the hardware is undamaged. Replace damaged latches at $5–$10 each. Add window security pins — small steel pins that prevent the sash from sliding or lifting more than a few centimetres even if the latch is defeated.

$150–$500 depending on the number of windows

Install 8-mil security film with proper edge attachment on ground-floor and basement glass. Film applied only to the glass without frame attachment will fail against forced entry, since the entire pane pushes out of the frame. The window film deep-dive covers what thickness means and why anchoring is the critical variable.

$1,000 and up

Laminated security glass as a unit replacement is more effective than film on very large panes, though a much larger investment. Basement interior quick-release bars are appropriate for high-exposure wells. Glass-break sensors wired into a monitored alarm round out the system. These options are appropriate for a specific, assessed threat profile rather than a default starting point.

What to skip

• Films under 8 mil marketed as "security film." The minimum threshold for forced-entry resistance is 8 mil. Thinner products are safety films.
• Daylight-only film installation. Without frame attachment, the pane pushes out intact on the first hit.
• Replacing windows as a first step. 8-mil film achieves most of the benefit at a fraction of the cost.
• Fixed exterior bars on egress windows. A fire hazard; interior quick-release bars only.

Continue reading

• Security window film: what works and what does not
• Window locks, stops, and patio door bars
• Door security: the complete guide — the door remains the primary vector

Articles in this series

• Window Locks, Stops, and Patio Door Bars

  How secondary window hardware adds a second physical decision point without blocking emergency egress — ranked picks with Canadian availability.

• Is security window film worth it? An honest cost-benefit analysis

  When residential security window film actually makes a difference, when it's not the first priority, and how to assess your home's specific risk profile.

• Security Window Film: Thickness Is Only Half the System

  Why 8-mil film, edge attachment, and frame condition matter more than generic security-film marketing — sourced product picks, professional vs DIY, Quebec install notes.