• Fits sash windows from 20" to 44-1/2", accommodating a variety of window sizes.
  • Features clear safety glass that enhances insulation, keeping indoor temperatures comfortable year-round.
  • Offers a non-permanent setup ideal for renters, requiring no alterations to windows.
  • Available in heavy-duty extruded aluminum or vinyl, ensuring longevity and style flexibility.
  • Multiple size options tailored to meet specific needs, ensuring a perfect fit for your cat and window.

Liberty Cat Door for Sash Windows

Deposit-Safe Sash Window Insert For Renters

Made in the USA USA flag icon
Regular price $439.99

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Frame Material
Color: Black
Window Width Range


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Designed for rental homes and temporary setups, this spring-tension sash insert slides directly into existing window tracks without drilling, pairing insulating safety glass with a lightweight magnetic flap so your cat gains outdoor freedom without risking your deposit.

The Liberty Cat Door for Sash Windows gives your cat independent outdoor access through a tool-free, non-permanent panel designed for vertical sash windows. Built with single-pane safety glass and durable frame options, it maintains home insulation and security without requiring permanent modifications.

Versatile Fit for Sash Windows
Designed to fit sash window openings from 20" to 44-1/2" wide, this insert features built-in spring-loaded adjustment for a draft-free seal. The non-permanent design makes it an ideal solution for both renters and homeowners.

Energy-Efficient Safety Glass
Constructed with durable single-pane safety glass, the insert preserves natural sunlight and clear outdoor views while protecting your home against outdoor drafts and weather extremes.

Tool-Free Installation
The spring-loaded mechanism snaps securely into place within your window track without tools, drilling, or hardware alterations, making installation and seasonal removal quick and simple.

Aluminum & Vinyl Frame Options
Select between heavy-duty extruded aluminum or flexible vinyl frames to match your existing window style. Aluminum models fit window tracks at least 1" wide, while vinyl models fit tracks at least 1-1/2" wide.

Secure Access Control
Includes a sturdy locking cover that slides into place over the flap, allowing you to easily manage pet access and keep your cat safely indoors when needed.

Installation & Fit

  • Fits standard vertical sash window openings measuring 21-1/2" to 44" wide with up to 3-1/2" of spring-loaded height adjustment for a draft-free seal.
  • Requires vertical sash window tracks measuring at least 1" wide for aluminum frames or 1-1/2" wide for vinyl frames.
  • Constructed with heavy-duty extruded aluminum or vinyl framing and single-pane safety glass to preserve thermal insulation.
  • Includes a slide-in locking cover to secure the opening and regulate pet access.
  • Tool-free DIY setup snaps directly into place within existing tracks in under 5 minutes with zero drilling or permanent modifications.

Best Suited For

Ideal for:

  • Renters and homeowners seeking a fast, tool-free installation that slides into place with zero drilling or permanent modifications.
  • Cats and small, timid pets who benefit from a lightweight flexible flap and gentle magnetic tension for effortless access.
  • Window tracks made of aluminum (at least 1" wide) or vinyl (at least 1-1/2" wide).

Not ideal for:

Questions

What prevents cold air from entering through the pet door?

The door is designed with robust magnetic closures and weatherstripping to prevent drafts, creating an efficient barrier against cold air.

Does this insulate well in severe weather?

This door has superior insulating capabilities. The double flaps have magnets that seal all the way around, and will stay closed in wind gusts up to 50mph. The Low-e glass also compliments the insulating value of you new vinyl door. It is our #1 recommendation for extreme climates.

Does this work with aluminum, vinyl or wood window frames?

The insert is normally held in place by the track your window slides in, so the track dimensions matter more than what the frame is made of. Aluminum, vinyl and wood frames can all work provided the channel is the right size.

Wood frames are the exception worth planning for. Many older wood windows have no track at all, just a flat opening, which means the insert has nothing to seat into. In that case the pet door frame needs to be secured mechanically so it cannot be pushed out or fall inward, usually by fitting brackets or a wood stop against the frame on both sides. It is a straightforward addition, but it is extra work, so tell us if your window is wood and untracked before you order.

One more thing to keep in mind: vinyl and wood move more with temperature than aluminum does, so a snug measurement taken on a cold day can read differently in summer. Measure at a moderate temperature where you can, and tell us the frame material when you send dimensions.

Explore all questions
Product Details

Product Details

The Liberty Cat Door for Sash Windows gives your cat independent outdoor access through a tool-free, non-permanent panel designed for vertical sash windows. Built with single-pane safety glass and durable frame options, it maintains home insulation and security without requiring permanent modifications.

Versatile Fit for Sash Windows
Designed to fit sash window openings from 20" to 44-1/2" wide, this insert features built-in spring-loaded adjustment for a draft-free seal. The non-permanent design makes it an ideal solution for both renters and homeowners.

Energy-Efficient Safety Glass
Constructed with durable single-pane safety glass, the insert preserves natural sunlight and clear outdoor views while protecting your home against outdoor drafts and weather extremes.

Tool-Free Installation
The spring-loaded mechanism snaps securely into place within your window track without tools, drilling, or hardware alterations, making installation and seasonal removal quick and simple.

Aluminum & Vinyl Frame Options
Select between heavy-duty extruded aluminum or flexible vinyl frames to match your existing window style. Aluminum models fit window tracks at least 1" wide, while vinyl models fit tracks at least 1-1/2" wide.

Secure Access Control
Includes a sturdy locking cover that slides into place over the flap, allowing you to easily manage pet access and keep your cat safely indoors when needed.

Sizing & Fit

Size Chart

Flap Dimensions:

7"w x 8"h

The entry way your dog goes through.

Small flap
Small frame
Small rough cut

Height To Raise Window:

18 1/2"

How high you must raise your window in order to fit the panel into the track.

Flap Size Flap Dimension Outside Frame Dimension Recommended Pet Height
Small 7"w x 8"h 18 1/2" 9" - 13"

 

Do not know which size to get? Here is a measurement guide to help you out

FAQs

FAQ

Reviews

Customer Reviews

Request Freight Quote

Track heights exceeding 106 inches (107" or higher) may require additional shipping charges. Please provide your contact information for a custom freight quote, and our team will follow up during normal business hours.