• Adjustable for horizontal sliding windows custom built to match your window's measurements
  • Clear safety glass and weather-resistant flaps are energy efficient and maintain indoor comfort in moderate weather.
  • Spring-loaded design allows for quick, secure installation without permanent alterations, making it ideal for renters, vacation homes, and more.
  • Features a heavy-duty white frame is available in aluminum and vinyl, built to withstand extreme weather and pet use.
  • Comes with a sturdy locking cover to keep your home secure while providing pet freedom.

Liberty Custom Pet Door for Horizontal Sliding Windows

Custom Height Sliding Window Access Without Drilling

Regular price $609.99

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Size
Frame Style
Adjustment Range


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Custom-built to your exact window height, this tool-free spring-loaded panel combines insulating safety glass with an adjustable magnetic flap to give your pet effortless access without permanent window modifications.

The Liberty Custom Pet Door for Horizontal Sliding Windows offers a custom-tailored, weather-tight pet entrance designed specifically for your window's exact measurements. Built with single-pane safety glass and durable frame materials, it provides seamless outdoor access for your pet without requiring permanent alterations.

Custom Built to Your Measurements
Engineered to match your specific window dimensions, this insert installs into horizontal sliding window tracks without permanent structural modifications. The spring-loaded mechanism provides up to 3-1/2" of built-in height adjustment for a snug, draft-free seal.

Energy-Efficient Safety Glass
Constructed with durable single-pane safety glass, the insert preserves natural sunlight and outdoor visibility while keeping your home insulated against seasonal temperature extremes.

All-Weather Magnetic Flap
The clear vinyl pet flap remains flexible in temperatures ranging from 0°F to 120°F. Magnetic closure strips and weatherstripping maintain a tight seal against heavy winds and drafts, with adjustable magnet tension to suit your pet's needs.

Aluminum & Vinyl Frame Options
Available in clean white finishes with heavy-duty extruded aluminum or flexible vinyl frames. Aluminum models require window tracks at least 1" wide, while vinyl models fit tracks at least 1-1/2" wide.

Integrated Security Cover
Includes a sturdy locking cover that slides securely over the flap opening, giving you total access control and peace of mind when keeping your pets safely indoors.

Installation & Fit

  • Custom built to your window's exact height dimensions with up to 3-1/2" of spring-loaded height adjustment for a draft-free seal.
  • Requires horizontal sliding 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 in a white finish and single-pane safety glass.
  • Includes a slide-in locking cover to secure the opening and regulate pet access.
  • Tool-free DIY installation slides directly into existing window tracks in under 5 minutes with zero drilling or permanent modifications.

Best Suited For

Ideal for:

  • Non-standard horizontal sliding window heights requiring a tailored, made-to-measure fit with built-in spring height adjustment.
  • Renters and homeowners seeking a fast, tool-free installation that slides into place with zero drilling or permanent modifications.
  • Small to large dogs and timid pets who benefit from a lightweight flexible flap with gentle magnetic closure.
  • Horizontal sliding 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.

Can you lock the pet door?

It comes with a latched closing cover, and you slide that in on the inside of the house.

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 Pet Door for Horizontal Sliding Windows offers a custom-tailored, weather-tight pet entrance designed specifically for your window's exact measurements. Built with single-pane safety glass and durable frame materials, it provides seamless outdoor access for your pet without requiring permanent alterations.

Custom Built to Your Measurements
Engineered to match your specific window dimensions, this insert installs into horizontal sliding window tracks without permanent structural modifications. The spring-loaded mechanism provides up to 3-1/2" of built-in height adjustment for a snug, draft-free seal.

Energy-Efficient Safety Glass
Constructed with durable single-pane safety glass, the insert preserves natural sunlight and outdoor visibility while keeping your home insulated against seasonal temperature extremes.

All-Weather Magnetic Flap
The clear vinyl pet flap remains flexible in temperatures ranging from 0°F to 120°F. Magnetic closure strips and weatherstripping maintain a tight seal against heavy winds and drafts, with adjustable magnet tension to suit your pet's needs.

Aluminum & Vinyl Frame Options
Available in clean white finishes with heavy-duty extruded aluminum or flexible vinyl frames. Aluminum models require window tracks at least 1" wide, while vinyl models fit tracks at least 1-1/2" wide.

Integrated Security Cover
Includes a sturdy locking cover that slides securely over the flap opening, giving you total access control and peace of mind when keeping your pets safely indoors.

Size icon Sizing & Fit

Size Chart

Flap Dimensions:

5"w x 12"h

The entry way your dog goes through.

Overall Panel Width

10 3/16"

How wide your panel is.

Flap dimensions
Panel width
Step over height

Step-Over Height

3" - 5"

The distance from the bottom of the panel to the bottom of your flap.

Flap Dimensions:

7"w x 16"h

The entry way your dog goes through.

Overall Panel Width

12 1/4"

How wide your panel is.

Flap dimensions
Panel width
Step over height

Step-Over Height

3" - 5"

The distance from the bottom of the panel to the bottom of your flap.

Flap Dimensions:

9"w x 20"h

The entry way your dog goes through.

Overall Panel Width

14 1/4"

How wide your panel is.

Flap dimensions
Panel width
Step over height

Step-Over Height

3" - 7"

The distance from the bottom of the panel to the bottom of your flap.

Flap Size Flap Dimension Step Over Range Outside Frame Dimension Recommended Pet Height
Small 5"w x 12"h 3" - 5" 10 3/16" 9" - 16"
Medium 7"w x 16"h 3" - 5" 12 1/4" 9" - 22"
Large 9"w x 20"h 3" - 7" 14 1/4" 9" - 28"

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

Aluminum panel has 1" framing, measure your track width to make sure that your window will accommodate the panel.

If your measured track height does not fall within one of the ranges above, we can make a custom height. Custom height option may take up to 4 weeks to special order the glass and build the panel. If your measured track height is near the bottom of the adjustment range then you should review A Note of Caution.

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.