Pet Door Guys for Cats - "In The Glass"


  • Keep the security of your home and use your existing slider lock
  • Steps: Glazier company measures, place order on site, complete form with custom dimensions, glass piece ships, glazier replaces old glass with new
  • For full detailed ordering instructions, click here
  • Pre-installed Endura Flap Pet Door eases installation for glazier and offers the perfect, secure solution
  • Professional glazier highly recommended
  • This is a custom product, all orders are FINAL, NO RETURNS

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Stock No: C02DD

Availability: In stock

Price From: $800
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Price From: $800
Pet Door Guys for Cats - "In The Glass"
Small Endura Flap for Cats installed in glass

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  • Keep the security of your home and use your existing slider lock
  • Steps: Glazier company measures, place order on site, complete form with custom dimensions, glass piece ships, glazier replaces old glass with new
  • For full detailed ordering instructions, click here
  • Pre-installed Endura Flap Pet Door eases installation for glazier and offers the perfect, secure solution
  • Professional glazier highly recommended
  • This is a custom product, all orders are FINAL, NO RETURNS
Glass SizeCat Flap SizeFlap DimensionStock No
Standard Glass - Less than 34" x 76"Small #066" w x 11" hC02DDPS
Oversize Glass - Up to 46" x 92"Small #066" w x 11" hC02DDPO

Oversized glass must ship to your glass compay or another non-residential address.



The Pet Door Guys: Cat Door In the Glass

The best way to install a cat door through your existing sliding glass door frame is by replacing the glass with a Pet Door Guys unit! The new glass will have a cat door installed at the bottom, and you’ll be able to use your sliding glass door like normal. A glass professional will be needed to come measure your current glass and later swap it out for the new glass that has the cat door. The cat door that is used is the energy efficient Endura Flap, which is an insulating, flexible flap perfect for extreme weather. The flap system is extremely durable and carries a 15 year warranty.

How to Order

  • First, check that one of the installation options is suitable for you (see the Placement Guide for a more detailed explanation of the options). They are:
    • 2 Panel Slider: Installation in either side of the inside track panel. When using the center-post side, it's important to ensure that the screen will not interfere with the action of the cat door flap.
    • 3 Panel Slider: Installation may be in either side of inside track slider or jamb side of 3rd panel. The same concern applies to the screen as above.
    • 4 Panel Slider: Installation may be on either side of either inside track panel
  • Review How to Measure Your Cat to choose the appropriate size opening for your cat. The unit will have a minimum 3 3/4" step-over height in addition to your existing frame, so be sure to take that into account!
  • Engage a local glass shop willing to do the measuring and installation. The glass shop installer disassembles your sliding glass door (a very easy job), takes width, height and thickness measurements then re-installs your glass slider. He completes his portion of the Order Form, and the glass installers should know if you have any other specifics that would need to be noted.
  • Read our Detailed Information Page to get more specific information about how this works. Be sure to share this information with the local glass shop. If the installer has questions have them contact us directly and we can answer any specific questions they may have.
  • Purchase the product. Your total for merchandise, shipping and any sales tax will be shown. Charges from your local glass shop are not included, so you would pay your installer separately.
  • We then arrange with the factory to custom-build a new piece of glass with the cat door in the lower corner that you specify. We have that unit shipped to your glass shop.

At your convenience the glass shop installer returns to your home, uninstalls your glass panel and replaces it with the new panel containing the cat door.

You are responsible for payment to the glass shop for the measurement and install. We will charge you only for the cat door. In our experience, the cost for these two service calls will likely be between $120 and $200 but you may want to establish this cost in advance.

More Important Info

  • Click here for more information about LoE glass.
  • The vinyl framing is available in white or beige and that's what you're choosing in the drop down product select. The cat door framing comes only in white.
  • Because this is a custom order all sales are final.
  • Glass that is 34" x 76" or smaller is considered "standard" size.
  • Glass that is larger than 34" x 76" is considered "oversize" and must ship to your glass company or another non-residential address.
  • You can get an approximation of your actual glass size right now by measuring the "daylight" dimension (just what you can see) and adding 3/4" in both dimensions. This is NOT accurate enough to order the product.
  • Allow about 5-6 weeks plus transit time for delivery.

Customer Reviews

Set Direction
  • Love It! review by Taylor
    5 5 Love It!

    This is a great upgrade from a patio panel. I'm able to use my existing frame and lock so the security original and energy efficiency is much improved. The cat flap is wind resistant so it took some time for my cat to get accustomed to using it. I definitely recommend working with a local glass company because there are a lot of questions about the glass size, thickness, type of LoE coating etc that I could not answer. They also should be experts are taking out the old glass and replacing with the new unit. Oh and here's a tip: Save the old glass in case you sell the home and the new owner does not want/need a pet door. The process can be reversed.

    (Posted on 12/28/2017)

  • Cat loves it and we do too review by Arnold
    5 5 Cat loves it and we do too

    We had originally wanted to cut a hole in our glass french door (yes, this product works for non-sliding glass doors too), but couldn't since it was dual pane glass. Anyway, this product was the simplest solution we could find. The door itself is very durable and insulated, but took a bit for our cat to get used to because of the strong magnets. We took out a magnet or two for training purposes and put it back in once the cat was used to it. So far no issues - worth the investment!

    (Posted on 12/5/2017)

  • Fantastic review by Betty
    5 5 Fantastic

    Love this! We took a gamble living in Canada and had it shipped to a U.S. Address and picked it up. Our glass installer measured for the order and installed it today. We love it! So glad to get the full width of the door back. The panel was good but this is amazing. When we saw it we weren't sure it would work. It comes not as just a pice of glass but a glass in a frame that fits into your door frame. Very minimal reduction in view. Genius really. Thank you!!!

    (Posted on 9/21/2016)

  • Excellent Product review by Louise
    5 5 Excellent Product

    Excellent product. Extremely happy . Wish I had found this company years ago. Great craftmanship. Thank you.

    (Posted on 2/15/2015)

  • excellent product review by bob
    5 5 excellent product

    I am a carpenter and did the install myself. went together without a hitch. the finished product is beautiful and works flawlessly. great design

    (Posted on 11/4/2014)

  • Awesome! review by Fantastic!
    5 5 Awesome!

    Wish I would have done this much sooner. We couldn't be happier with our purchase. No more squeezing between a removal panel. No more drafts. Love it.

    (Posted on 10/28/2014)

  • "In The Glass" review by SG in Virginia
    5 5 "In The Glass"

    I absolutely love this door in the glass. Now my patio door opens, shuts, and locks normally again. All my friends are very impressed when they see it. We tried the panel insert first, but our patio door is fairly small (3 foot wide slider), so the panel didn't leave much of an opening for us. So we really needed the "in the glass" feature. Fit and finish on the "in the glass" door (and the panel door too) are flawless. We have owned several pet doors over the years and these are definitely top of the line pet doors. Definitely worth the price, especially when the winter wind howls, the magnetic edge really holds it closed. Our previous pet doors did not stay closed when the wind blew.

    (Posted on 7/13/2013)

  • Great Door review by Lorrie
    5 5 Great Door

    We purchased our door a couple of months ago and we love it. It is so much better than the panel door we had before. My husband installed it himself and it fit perfectly.

    (Posted on 7/6/2013)

Weight 3.0000
Manufacturer Pet Door Guys
Your Maximum Pet Size Cats
Climate Suitability Severe-4 Season
Sealing Value Very High
Wind Resistance Very High
Frame Material Vinyl
Employs Patented “Endura Flap” Yes
Insulation Value High
Possible to Add Additional Magnets for Greater Wind Resistance Yes
Flap Material Engage Polyolefin
Flap Design Single, One Part , Flexible, Insulated Flap
Flap Colors Clear
Flap Thickness 7/8"
Award Winning Design Yes
Replacement Flaps Available Yes
Flap Warranty (if separate) 15 years
Locking Cover Material Dimensional ABS
Ability to Lock Flap Separate Locking Cover-Loads from Top
Can Be Installed In Dual Pane Glass Sliding Glass Door, Sash Windows, Sidelight, Sideways Sliding Windows, Single Pane Glass Sliding Glass Door, Vinyl-Framed Sliding Glass Door
Warranty Period 1 year
Return Period Not Returnable
Manufacturer's Restocking Fee Product is final sale, no return

What is an "In the Glass" Cat Door?



Pet Door Guys

products offer Endura Flap™ exclusively. Here's why -

Design of the Endura Flap


Click below to expand:

  • 1. Go over all the information in the 'Details' tab to find out how to order the correct specifications for your pet and your sliding glass door.
  • 2. Review the Sizing Suggestions, Adding Step Over, and After Installation pages to find the appropriate size for your pet.
  • 3. Find a Glazier or Glass Professional in your area that will be able to measure and install for you.
  • 4. Purchase the product on You will receive an Email asking for more measurements that you glazier can fill out.
  • 5. Have your local glazier take the measurements needed, fill out the order form, and send it back to us.
  • 6. We will ship the product directly to the glazier who would take out your existing glass and replace it with your new "In the Glass" cat flap.

You would need the:

  • net glass width
  • net glass height
  • replacement glass thickness
  • patio door opening direction
  • whether the slider side is on the inside or outside of the stationary glass

No. we would replace the glass on one of the sliding glass doors with another piece of glass with a cat door installed. Your existing sliding glass door framing will be used.

No, it only includes the price of the product. Typically, glaziers will charge between $150 - 250 for this project.

It is Low-emissivity coating which is used to reduce the heat and cold temperatures for escaping or entering through the glass.

It generally takes up to 3 or 4 weeks to manufacturer due to the custom needs. From there, it generally takes between 1 - 5 days to deliver depending on where you are located.

The existing locking mechanism of your sliding glass door will be used. There will also be a locking cover that you can slide over the pet door to prevent it from being used.

No, you cannot return this because it is a custom order.

Yes, you can visit our list of installers to see if there are any near you. If you don't see one in your area we suggest that you do a search online for glass companies in your zip code.

It is highly recommended that a glass professional to do the measuring and installation for you. However, you can do it yourself, depending on how handy you are.

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Pet Door Guys

guarantees it will repair or replace any Pet Door Guys product which is found to be defective in material or workmanship and will pay the costs of repair or replacement to the original owner for a period of one year. Insulated glass is warranted for life against seal failure. This warranty is subject to the following terms and conditions:

  • This guarantee is offered only to the original owners of single family homes who purchase a Pet Door Guys product in the United States. It is not transferable and terminates upon sale of the home and does not apply to re-installation at a second location.
  • The warranty does not extend to commercial applications.
  • Pet Door Guys is not responsible for glass breakage, failure due to misuse, applied tints or films, any customer alterations to the product including painting, improper installation or acts of nature including fire, flood or earthquake.  Pet Door Guys is not responsible for natural weathering of exterior finishes or corrosion in highly corrosive environments.
  • Pet Door Guys is not responsible for incidental or consequential damage beyond our control. Pet door openings imply some risk. No guarantee is offered or implied regarding suitability or security against intrusion or unwanted entry or exit.