Window Dog Door Installation

Window pet door installation is one of the most flexible solutions available for homeowners, renters, and anyone who wants pet access without cutting through a door or wall. The Security Boss sash window and side sliding window inserts fit directly into your existing window opening using a spring-loaded tension system. No screws, no drilling, no permanent modification to your window or frame. The insert slides in, locks into place, and can be removed just as easily whenever you need your full window back.

Sash Window Installation For double-hung and single-hung sash windows that slide up and down. The insert fits into the window channel horizontally, with the spring-loaded end adjusting to your specific window width and locking in under tension. The pet door is positioned at the base of the insert on the left or right side, selectable at the time of order.

Side Sliding Window Installation For windows that slide horizontally. The insert fits into the window track vertically, with the spring-loaded top adjusting to your window height and locking in under tension. Six height ranges and snap-on 2-inch extensions accommodate most residential side sliding window heights.

Contact Portal Pros at 855-DOG-DOOR with photos of your window and your pet's shoulder height and width, and we'll provide a same-day quote.

What Is a Window Pet Door Installation?

A window pet door installation places a self-contained insert unit into your existing window opening. The insert occupies the lower portion of a sash window opening or the side portion of a side sliding window opening, with the pet door built into the base of the unit. The upper portion of the insert is tempered glass so light still comes through. The spring-loaded end or top of the insert adjusts to your exact window width or height and locks in place under tension — the same principle used in patio door pet door inserts, but sized and configured for window openings.

Because window pet door inserts require no cutting, no screws, and no permanent modification to your window or frame, they are ideal for renters, condo owners with restrictions on modifications, and homeowners who want a removable solution they can take with them when they move.

What Types of Windows Can Have a Pet Door Installed?

Portal Pros installs window pet doors into the following window configurations:

• Double-hung sash windows — both sashes slide up and down; the insert fits into the lower sash opening, which is raised to accommodate it
• Single-hung sash windows — only the lower sash moves; the insert fits into the raised lower sash opening the same way
• Side sliding windows — windows that slide horizontally; the insert fits into the open side of the window track
• Basement windows — sash or side sliding basement windows are common installations, particularly for giving cats or small dogs outdoor access through a lower-level window
• Catio connection windows — window pet door inserts are one of the most popular ways to connect an indoor space to an outdoor cat enclosure without permanent modification

Casement windows, awning windows, and fixed windows are not compatible with insert-style window pet doors. Send us a photo of your window and we'll confirm compatibility.

Why Choose Professional Window Pet Door Installation?

Correct sizing for a tight fit. Window insert pet doors are measured by window width for sash inserts and window height for side sliding inserts. Selecting the wrong size range results in an insert that rattles, tilts, or lets air through on the sides. Portal Pros confirms the right size for your specific window opening before the product ships.

Left side or right side pet door placement. The pet door opening can be positioned on the left or right side of the insert as viewed from inside the home. The correct placement depends on your window's location relative to the wall, any obstructions, and where your pet will approach from. Portal Pros advises on the right configuration for your specific setup.

Proper tension and security setup. The spring-loaded end must be tensioned correctly and both locking knobs secured to prevent the insert from being compressed from the outside. A brace bar is also recommended to immobilize the open window sash for maximum security. Portal Pros installers set up the full system correctly including brace bar placement.

Extension setup for non-standard window sizes. Windows outside the standard insert height or width ranges can be accommodated with snap-on 2-inch extensions. Portal Pros confirms whether extensions are needed and installs them as part of the setup.

Craftsmanship guarantee. Every Portal Pros window pet door installation is backed by our craftsmanship guarantee. If there is ever an issue with our installation work, we make it right.

How the Window Pet Door Installation Process Works

Step 1 — Measure and Quote Contact Portal Pros with photos of your window from inside and outside, your pet's shoulder height and width, and your window's interior channel width for sash windows or interior track height for side sliding windows. We'll confirm the right insert size, pet door placement side, and whether extensions are needed, then provide a same-day quote.

Step 2 — Scheduling Once you order, a Portal Pros installer contacts you within 24 to 48 hours to schedule your installation. Window insert installations are completed in a single visit with no fabrication lead time.

Step 3 — Professional Installation A Portal Pros installer arrives with the correctly sized insert for your window. The lower sash is raised to the appropriate height, the insert is set into the window channel with the pet door on the correct side, the spring-loaded end is tensioned and both locking knobs are secured. Extensions are snapped on if needed. The brace bar is set to immobilize the open sash for security.

Step 4 — Final Test and Walkthrough Your installer tests the flap operation, confirms the insert sits tight in the channel with no rattle or gaps, demonstrates the locking security panel and brace bar setup, and walks you through removal and reinstallation before leaving. Most window installations are completed in under an hour.

Window Pet Door Products Portal Pros Installs

Portal Pros installs all pet doors on the market. The Security Boss sash window and side sliding window inserts are the purpose-built products for window applications and are available directly through Portal Pros.

SB Standard Sash Lockable Window Pet Door Insert Purpose-built for double-hung and single-hung sash windows. Tempered safety glass panel with heavy-duty aluminum frame. Spring-loaded end adjusts to fit your window channel width. Pet door positioned on left or right side of the insert, selectable at order. Fully lockable security panel included. Extendable brace bar included. 2-inch snap-on extensions available for non-standard widths. Handcrafted to order by Security Boss. Available in multiple width ranges to fit most standard residential sash windows. Compatible with cats, small dogs, and medium dogs. Lifetime manufacturer warranty.

SB Standard Side Sliding Window Pet Door Insert Purpose-built for horizontal side sliding windows. Same tempered glass and aluminum frame construction as the sash insert. Spring-loaded top adjusts to your window track height. Six height ranges plus snap-on 2-inch extensions accommodate most residential side sliding window heights. Fully lockable security panel and brace bar included. Handcrafted to order by Security Boss. Lifetime manufacturer warranty.

Contact Portal Pros at 855-DOG-DOOR for current pricing and to confirm the right product and size for your window.

Why Portal Pros for Window Pet Door Installation?

Portal Pros is the nation's leading professional pet door installation company with over 20 years of industry experience.

• No cutting, no drilling, no permanent modification — ideal for renters, condo owners, and anyone wanting a removable solution
• Sash and side sliding window options — purpose-built inserts for both window types
• Left or right side pet door placement — configured for your specific window and pet approach direction
• Extensions available for non-standard window sizes
• Licensed, bonded and insured installers nationwide
• Craftsmanship guarantee — if there's ever an issue with our installation, we make it right
• 1,100+ five-star reviews from homeowners across the country
• Free shipping on all pet door products, always
• Giving back — a portion of every sale is donated to no-kill animal shelters across the United States

Ready to Get Your Window Pet Door Installed?

Call 855-DOG-DOOR today or fill out the quote form above. Send us photos of your window from inside and outside along with your pet's shoulder height and width and your window channel width or track height, and we'll come back to you with the right product, the right size, and a same-day quote.