• Custom built to fit your sash window according to your measurements
  • 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.

Liberty Custom Cat Door for Sash Windows

Seasonal Window Panel Removable In Seconds

Regular price $802.00

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Frame Material
Color: White
Width Adjustment Range


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Tailored precisely to your sash window dimensions, this tool-free spring-loaded insert pairs insulating safety glass with a lightweight magnetic flap to give your cat effortless outdoor access without permanent window modifications.

  • Custom built to fit your sash window according to your measurements
  • 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.

Installation & Fit

  • Custom built to your window's exact dimensions 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 maintain thermal insulation.
  • Includes a slide-in locking cover to secure the opening and regulate pet access.
  • Tool-free DIY setup installs in under 5 minutes with zero drilling, hardware, or permanent window alterations.

Best Suited For

Ideal for:

  • Non-standard sash window dimensions requiring a tailored, made-to-measure fit with built-in spring tension adjustment.
  • Renters and homeowners wanting a fast, tool-free installation that requires zero drilling or permanent window modifications.
  • Cats and small, timid pets who benefit from a lightweight flap and gentle magnetic seal for effortless passage.
  • Window tracks measuring at least 1" wide for aluminum or 1-1/2" wide for vinyl frames.

Not ideal for:

  • Severe weather environments where the Endura Flap Thermo Sash will provide significantly better insulating power to keep out the winter cold and summer heat

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 Custom Cat Door for Sash Windows delivers a seamless, non-permanent pet access solution tailored precisely to your window's dimensions. Engineered with energy-efficient safety glass and heavy-duty frame materials, it provides your cat independence while keeping your home secure and weather-tight.

Engineered for Custom Window Fit
Custom built to your exact window opening dimensions, this insert installs effortlessly without requiring permanent modifications to your window frame. The spring-loaded design offers up to 3-1/2" of built-in height adjustment for a snug, draft-free seal.

Energy Efficient Safety Glass
Built with durable single-pane safety glass, the insert preserves natural light and clear outdoor views while maintaining indoor thermal efficiency throughout every season.

Tool-Free Installation
Designed for instant setup and removal, the spring-loaded tension mechanism allows you to slide the insert directly into your existing window track without drilling or hardware alterations.

Durable Aluminum & Vinyl Options
Select between heavy-duty extruded aluminum or flexible vinyl frames to complement your home decor. Aluminum models fit window tracks at least 1" wide, while vinyl models require tracks at least 1-1/2" wide.

Integrated Security & Control
Every door includes a sturdy locking cover that slides into place, giving you total control over your cat's access and added peace of mind when keeping pets safely indoors.

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.