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Window Restrictor Lock
Window restrictor cable

Window Restrictor Lock

Opens for air. Stops a child, and a stranger.

$19.99One-time · free tracked shipping
  • Limits how far a window opensA steel cable lets it vent, then stops it short.
  • Childproof and burglar-honestToo narrow to climb out of, or reach far into.
  • Key release for a clean exitUnlocks fully for cleaning or escape when you need it.
  • Screws on in minutesA small bracket on the frame and the sash, that is it.
Free tracked shipping 30-day returns Tested before shipping
Window Restrictor Lock $19.99

Two risks, one window

An upstairs window is two risks in one.

Open it for air and an upper-floor window becomes a fall risk for a small child and an entry point off a porch roof or ladder for everyone else. Keep it shut and the room turns stuffy.

A restrictor settles both. A short steel cable lets the window vent a few inches and no more, so air moves but nobody small climbs out and nobody else climbs in. A key releases it fully whenever you need the window wide.

The same few inches that cool a room can keep a child in and a stranger out.
4in
safe vent gap
1key
full release
5min
to fit
4.6/5
owner rating
Air without the worry

A few inches of breeze, and a hard stop.

The cable holds the window to a safe opening, enough to move air through a bedroom or nursery without leaving a gap a child could climb out of or an intruder could reach through.

Turn the key and the cable releases, so the window opens fully for cleaning, for a warm day, or to climb out in an emergency.

Upstairs windowsNurseriesApartmentsFire escape
A few minutes with a screwdriver

Two brackets, one cable.

1

Mark the spots

Hold the brackets on the frame and the opening sash, level with each other.

2

Screw them on

Fix both brackets with the included screws.

3

Clip the cable

Attach the steel cable between them to set the vent limit.

4

Test and key it

Open the window to the stop, then check the key releases it fully.

No app, no power, no monthly fee. A mechanical limit that just holds.
For parents and renters

Peace of mind for the rooms above the ground floor.

It mounts with a few small screws that patch over easily, so it suits a rental, and it gives parents a window that breathes without becoming a fall risk for a curious toddler.

Layer your defense

A limited window, and an alarm on the glass.

The restrictor holds the window to a safe gap. The TremShield Alarm sticks to the same pane and sounds at 125dB the second the glass is touched or pried.

See the alarm
A limited window, and an alarm on the glass.
Good to know

Questions, answered calmly

To a safe vent of roughly four inches, enough for airflow but too narrow for a child to climb out or an intruder to reach far through. The key releases it for full opening.
With the cable set, the window cannot open past the safe gap, which removes the fall risk of an open upper-floor window while still letting the room breathe.
Yes. A key releases the cable so the window opens fully. Keep the key nearby so the window can be opened quickly when needed.
It works on most opening windows, including casement and sliding sash styles. The brackets mount on the frame and the moving part of the window.
It fixes with a few small screws. The holes are minor and patch over easily, which makes it workable in most rentals.
White TremShield vibration sensor alarm with red indicator light on a white background
Pairs with this

Add the alarm layer.

A lock slows a break-in down. An alarm makes sure it never stays quiet: the TremShield Vibration Alarm senses the first vibration and answers with 125 dB, before a window ever gives. Peel-and-stick install, no Wi-Fi, no monthly fees.

From $29.99 · multi-pack pricing on 2 and 4 packs

See the Alarm

From the security guide

How to Burglar-Proof Your Windows (Without Bars on the Glass)

A calm, complete guide to making your windows secure but still livable: the right lock for each window type, how to vent safely for air, ...

Read the guide →

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