Ideal Custom Height Fast Fit Patio Pet Door Insert - White

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  • Custom Ideal Fast Fit dog door for sliding door accommodates uncommon sliding glass door heights
  • The aluminum frame and separate extension piece comes in white or brushed aluminum to match your existing door frame
  • This is a pet door that comes with a custom height extension piece to fit your sliding glass door height (this piece is custom made and not returnable)
  • Clear, flexible flap is easy for pets of all sizes to use 
  • 3-5 days delay in shipping because this is a custom-built product

If your sliding glass door is too tall for most sliding door dog door inserts, or in between stock ranges for the Fast Fit Patio Door, the Custom Ideal Fast Fit Patio Pet Door is perfect for you. The custom door comes with a height extension piece for unusually tall track heights of up to 109 1/2". The Custom Ideal sliding glass dog door is a cost-effective solution to fit uncommon sliding door heights.  For tips to measure your track height correctly, please watch this video.

Not what you're looking for? Check out our full selection of sliding door dog door inserts and Ideal Pet Door Products.


  • Tool-free installation with the spring-loaded design
  • Separate height extension piece simply slides into the top channel of the ideal pet patio insert
  • Height extension piece can be built up to 14" (can make up to 16", but the manufacturer recommends that you then semi-permanently install by drilling the panel into the track for stability)
  • Flap sizes include small, medium, extra-large, and super-large (XXL)
  • Clear, vinyl flap is lined with magnets on the bottom edge to help keep it closed when not in use
  • Aluminum framing fits most sliding glass door tracks at least 7/8" thick
  • Fast fit panel is made with 1/8" thick single pane tempered glass
  • Sliding locking cover included to restrict access to the door when needed
  • Includes a pin lock to secure your door. Installing the pin lock requires drilling, so if you don't want any holes, you can purchase a Charley Bar for added security
  • Ideal for temperate, three-season climates



  • Cost-effective solution for uncommon sliding glass door heights
  • Made to complement the design of your existing sliding glass door
  • The lightweight and flexible vinyl flap is easy for pets to use
  • Custom step-over is a great solution for large and small dogs sharing the door
  • Does not require any permanent alterations to your home
  • Great for rentals and vacation homes

Size Chart

Flap SizeFlap DimensionStepOverRecommended

Pet Height*

Overall Width
Small5" w x 7" h2" 6" – 8"9 3⁄4"
Medium7" w x 11 1⁄4" h4"12" – 14 1⁄4" 11 7⁄16"
Extra Large10 1⁄2" w x 15" h8"22" – 24" 15 1⁄4"
Super Large15" w x 20" h8"24" – 27" 19 5⁄8"


We recommend that the width of the flap allow for at least 1" of space between your pets sides and the pet door frame.  This is so they will not have to squeeze through and will be more comfortable.

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


Sliding Door Measurements - If your measured track height is near the bottom of the adjustment range then you should review a note of caution.  If you are wondering how to measure your track? Review our Track Measuring Guide.

The maximum over-all height you can achieve in this manner is 110 ½," and the tallest the extension should be built is 14." However, it can be made to 16", but the manufacturer suggests that you would then semi-permanently install it for stability by drilling the panel into the slider track. The height extension is built to your custom dimension; it is not returnable, though the panel is (provided you have not ordered any other custom feature like a custom step-over).

Height Add-On Extension - The Custom Ideal Panel comes with two pieces, the panel and the separate custom made height extension. The extension piece slides into the top chanel of the pet door.  If you already have the Ideal "Fast Fit" Panel but it is too short for your slider, you can purchase the Ideal "Fast Fit" Height Extension

Step-Over Options - The Custom Step Over Options can be extremely important in properly fitting your pets. Medium Flap 2.5" step-over, Extra Large 2.5" and 4" stepover and Super Large 2.5" and 4" step-overs.

Replacement Flaps and Parts You can find the replacement flap at Ideal "Original" Replacement Flaps or you can get both the flap and the plastic frame a Ideal "Fast Fit" Replacement Flap Assembly.


Additional Information

Frame Material

Extruded Aluminum

Track Width Minimum


Flap Material


Flap Colors


Flap Thickness


Dual or Single Pane

Single Pane 1/8" Thick

Warranty Period

1 year

Return Period

30 days

Locking Cover Material

ABS Plastic

Your Maximum Pet Size

Cats, Large Cats, Small Dogs, Medium Dogs, Large Dogs, X-Large Dogs

Climate Suitability

Temperate-3 Season, Mild or Utility

House Locking Method

Pin Lock

Flap Design

Single, One Part, Flexible, Thin Flap

Can Be Installed In

Dual Pane Glass Sliding Glass Door, Single Pane Glass Sliding Glass Door

Custom Heights Available


High Aspect Ratio


Award Winning Design


Sealing Value


Wind Resistance


Insulation Value


Installation Instructions

Quick Video on Installing the Fast Fit (does not demonstrate height adjustment piece)

Fast Fit Aluminum Pet Patio Door

Step 1: Release the automatic height adjustment by turning the knobs located near the top of panel counter-clockwise and pressing. The height adjustment panel should fully extend upward (pull up on panel if necessary).

Step 2: Open the sliding glass/screen door.

Step 3: Insert the Fast Fit with the knobs facing inside. Place the top edge into the top track of the sliding glass/screen door. Lift up and swing the lower portion of the panel onto the ridge in the sliding glass door (or screen door).

Step 4: Slide the Fast Fit against the door jamb. Make sure that top is fully extended (not tilted to one side) and the bottom of the panel is on the ridge in the bottom track. Slide the height extension piece into the top channel of the pet door.

Step 5: Hand-tighten the knobs by turning clockwise to lock the Fast Fit in place.

If you would like to permanently install the Fast Fit, you may screw through the aluminum fins that protrude on the existing frame of your door. Drill through the fins into the Fast Fit. Install two screws in the top and two in the side by the bottom of door. Do not put any screws into the frame by the glass of the Fast Fit as breakage may occur.


Installing the Additional Height Adjustment Piece:

Step 1: Place your Fast Fit Panel upright and rest in the lower track.

Step 2: Ensure the adjustment piece at the top of the panel is in its lowest setting.

Step 3: Slide the Height Adjustment Piece into the ‘U’ shaped flange at the top of the Fast Fit Panel.

Step 4: Gently release the thumbscrews and allow it to rise into the upper track.

Step 5: Once you have confirmed a proper fit, remove the panel and lay it on a flat surface to install weather stripping to each vertical side of the panel and the extension piece.

Step 6: Reinstall and tighten the thumbscrews.

Please Note: You can join the two pieces together for a more secure union by purchasing two tamper-proof bolts and nuts at your local hardware store. We recommend using a tamper-proof head on the outside (side opposite the thumbscrews). Drill through the ‘U’ shaped flange of the Fast Fit Panel and lower frame of the height extension piece. Be careful to not drill too close to the glass in the extension piece. Screw the two pieces together.

If you have a tall Height Extension piece (10” or greater), the manufacturer recommends screwing the two pieces together and semi-permanently mounting them to the frame of your slider.


Optional Permanent Placement for Fixed Panel Sliding Door:

Remove the screws that hold the fixed glass panel in place and slide it over. Insert the Fast Fit panel between the stationary panel and it's jamb. Re-fasten the fixed glass panel.


Installing Security Lock (Optional):

Step 1: With the sliding door in a closed position, place the lock in the desired location with the bolt in the retracted position, pointed toward the sliding glass door or stationary window rail. Leave approximately ⅛” clearance between the bolt tip and the aluminum rail.

Step 2: Holding the lock firmly in place, mark the screw holes and center of the bolt in the rail of the sliding door or stationary window.

Step 3: Drill two 5⁄32" holes for the mounting screws and a â3/8” hole for the locking bolt.

CAUTION: Do not drill into glass.

Step 4: With the sliding door in the closed position (with Fast Fit installed), mark the position for the second set of holes.

Repeat above instructions. CAUTION: Do not drill into glass.

In-Depth Ideal 'Fast Fit' Installation (does not demonstrate height adjustment piece)


How to Measure Your Sliding Glass Door for a Pet Door


Does this custom panel come with two parts?

Yes. You get the regular panel with the height adjustment range that is shorter than your custom height as well as the custom-built extension panel that allows the door to fit the height of your track.

How is this different than purchasing a regular Fast Fit and then a height extension separately?

It's not. We have just combined the two for your convenience. The prices are exactly the same as well. This page's product sizes are the standard patio door sizes with extension pieces.

Since this is a custom product, can I return it?

As long as the panel does not have a custom step-over, you can return the panel portion with the pet door, but you will not be able to return the custom height extension panel.

I already have this panel. How do I measure for the height extension only?

Calculate the height extension needed for a given track height by subtracting the maximum height of the adjustment range of the panel you've chosen from the measured height of your sliding glass door track and then add back 2-1/8".

Is this panel aluminum or vinyl?

This panel is aluminum. If you have a vinyl track, the Ideal brand has the VIP and VPP models available, and Endura Flap makes one of the best dog doors for sliding glass doors. However, those will not offer any custom heights outside of the listed adjustment ranges.

What climate is this best suitable for?

Ideal panels are best suited for temperate climates where insulation is not a vital factor when choosing a pet door. The weatherstripping that comes with the panel will ensure a weather-tight seal between the insert and your slider, but the pet door itself is suitable for temperate, three-season climates.

Does the Ideal Fast Fit Patio Door have an adjustable step-over?

No, the Fast Fit does not have an adjustable step-over. However, you can get a custom step-over. Keep in mind that the custom step-over cannot be adjusted once built, and it does make the item non-returnable.

How thick is the Ideal Patio pet door panel?

The FastFit frame is 7/8" thick.

How do I lock this panel to my door?

The door comes with a pin lock you can install. Alternatively, you can purchase a Charley Bar for added security.

The box I received has a shorter track height written on the box. Is that correct?

Yes, because the custom portion of this product is the extension panel that is built specifically for the height you need. So the box should contain the panel and the patio door extension.

What if my track is exactly 75"?

Then you could go with the 75" patio pet door height option, and if necessary, you can trim the flange at the top about 1" to be able to get it up and into your track.

What materials are used to make this patio door extension?

Most are made from aluminum and glass. In rare cases, for small extensions, they are all aluminum.

What can I do if my 75" patio pet door is 1/2" too tall?

You can trim up to 1" off the top of the Ideal Fast Fist.

What materials are used to make this patio door extension?

Most are made from aluminum and glass. In rare cases, for small extensions, they are all aluminum.

Is this Fast Fit pet door easy to install and uninstall?

This Ideal FastFit is a temporary pet door for sliding glass doors and takes a few minutes to install or take out. The more you do it, the easier it is.

Can you purchase a custom Ideal Fast Fit Cat Door?

Yes, it can be done. Please call our customer service team for a custom order. The other option is to order the small flap (soft vinyl) on the Custom Ideal "Fast Fit" Patio Pet Door.

I have a Shorty patio pet door. Can I get a height extension to fit my new taller slider?

Yes. Calculate the height extension needed for a given track height by subtracting the maximum height of the adjustment range of the panel you've chosen from the measured height of your sliding glass door track and then add back 2-1/8".

Does it come in a bronze color?

It used to come in dark bronze, but those are discontinued and no longer available.



The new and revised warranty that follows this disclaimer supersedes any and all previous warranties of whatever nature or description, whether express, implied or set by law. Any unexpired warranties shall now be governed by the terms of the new warranty for the duration of the existing warranty’s unexpired term.

One Year Warranty:

Ideal’s pet doors are very durable and with the proper care will provide many years of service for you and your pet. Thank you for selecting Ideal for your pet door. However, please be aware the pet doors are not waterproof against inclement weather or any excessive water exposure. The one year warranty set forth below applies to Ideal’s pet door(s).

This product has a One Year Warranty from the date of the purchase of the product to be free of manufacturer’s defects in workmanship and materials. This express One Year Warranty is limited only to the original purchaser of the product and is non-transferable. Satisfactory proof of purchase must be provided to the manufacturer for this one year warranty to apply. In that case, the manufacturer will replace at no charge to the purchaser the defective part(s). No refunds will be provided to the purchaser. No service contract is being provided under this One Year Warranty. Proof of purchase so that the One Year Warranty may be honored must be made to:

Ideal Pet Products, Inc.

24735 Avenue Rockefeller

Valencia, California, USA 91355

Attention: Warranty Department

(661) 294-2266 / 1-877-IDEALPET (433-2573)

Any and all implied warranties are expressly disclaimed and of no force or effect. These warranties include, but are not limited to, the implied warranties of merchantability, implied fitness for any intended purpose, and any warranties under the California Song-Beverly Consumer Act.

This One Year Warranty is void if the damage is due to improper installation, intentional misuse or abuse, repairs by anyone other than the manufacturer, the failure to follow manufacturer’s instructions, or if the product is being used for commercial purposes. Purchaser assumes all risks and liabilities for the misuse or abuse of the product, the commercial use of the product, or the failure to follow the manufacturer’s instructions.

This One Year Warranty only applies if the product is used for domesticated animals. The Manufacturer, Ideal, is not responsible and shall not have any liability for any damage to or defects caused by acts of God, criminal activity, dog abuse including, but not limited to chewing on the door, lightening, abuse, alteration, trespassing, children’s use of the product, unauthorized access, entry by non-domesticated or “stray” animals, or any other unintended use or misuse of the product.

The Manufacturer, Ideal, disclaims and excludes any liability for incidental, consequential, punitive, general, special, or other damages arising out of or connected with the purchase, use, or misuse of the product or concerning any warranty herein.

This One Year Warranty shall be governed by the laws of the State of California, USA. Venue shall be with the Los Angeles Superior Court, North Valley District.


This product, or any of its accessories, parts, or attachments may not prevent adults, children, animals, insects, or objects from passing through or using the opening created by the product.

Ideal Pet Products will not be liable for any unintended or accidental usage, misuse, abuse, criminal conduct, water intrusion, acts of god, damages or injuries occurring or accruing from the use of this product except in strict accordance with Ideal's One Year Warranty accompanying the sale of this product to the original purchaser.

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