9 Best Cat Door for Exterior Door (November 2026)
The best cat doors for exterior doors include the PetSafe Plastic Dog & Cat Door for most exterior doors, the PetSafe Plastic Dog & Cat Door for larger cats, and the Depets Large Cat Door for four-way locking.
On this page (8 sections)
- The best cat doors for exterior doors, by cat and by door
- How these cat doors for exterior doors were compared
- What door thickness does an exterior cat door fit?
- Which flap size suits your cat?
- How do the lock modes help on an exterior door?
- How much does weather sealing matter?
- What else should you check before you cut?
- Which exterior cat door should you buy?
The best cat door for exterior door installs for most homes is the PetSafe Plastic Dog & Cat Door in small, because its paintable frame fits doors from 1/16 to 2 in thick and the snap-on closing panel lets you shut your cat in or out. Pick the medium PetSafe for a bigger cat, a CEESC or Wordcam model for a 25 lb cat, or the Ideal Pet Products flap for a very small cat on a thin door.
An exterior door is a harsher home for a flap than an interior one. Wind pushes at the flap, rain runs down the door face, and the tunnel has to bridge whatever thickness the door has.
So the best cat door for an exterior door needs a tight seal and a frame that grips without wobbling.
We compared nine models on the specs that matter for that job: flap size against a cat's weight and waist, the door thickness each frame accepts, the seal around the flap and the lock modes. This guide covers who each pick suits, what its numbers mean day to day, and how to choose before you cut a hole in a door you can't easily replace.
Our picks at a glance
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Best for large cats on thicker doorsCheck it - 5
Best for thin exterior doorsCheck it - 6
Best for weather sealingCheck it - 7
Check itEGETOTA goTeamghjkl Cat Door Flap
Best for small cats and kittens - 8
Check itWordcam X-Large Tough Cat Door
Best in a dark finish - 9
Check itIdeal Pet Products Cat Flap Door
Best for very small cats
The best cat doors for exterior doors, by cat and by door
The top pick wins on fit range and control. The rest are the best answer for a named need: a heavier cat, a thinner door, a tighter seal or a lower budget of weight and cutout size.
Find your cat's weight first, then your door's thickness, and the list narrows fast.
PetSafe Plastic Dog & Cat Door: Best for most exterior doors
- Pets up to 15 lb
- Flap opening 5 1/8 x 8 1/4 in
- Fits doors 1/16 to 2 in thick
- Snap-on closing panel
- Paintable frame
A paintable plastic frame, a snap-on closing panel and a wide door-thickness range make this the easiest exterior fit for a cat up to 15 lb.
Pros
- Wide 1/16 to 2 in thickness range
- Snap-on closing panel for lockouts
- Paintable frame
Cons
- Small size only suits pets up to 15 lb
The PetSafe Plastic Dog & Cat Door in small is the safest first choice for a typical house cat on a standard exterior door. The flap opening measures 5 1/8 in wide by 8 1/4 in high, sized for pets up to 15 lb, and the frame fits wood, PVC, metal and paneled human doors from 1/16 to 2 in thick.
That thickness range is the widest here and the reason it tops the list. A 1-3/4 in exterior door and a 1-1/4 in door both take the same frame, so you measure once and order.
PetSafe includes a snap-on closing panel that slides over the opening when you want your cat in for the night. The plastic frame is paintable, so a white door and a painted door can both look tidy.
A cutting template and step-by-step instructions come in the box, and the kit carries a limited lifetime warranty from PetSafe.
The trade-off is size. This flap suits a cat, not a big dog, and a large cat close to the 15 lb line will feel cramped.
If your cat is near that limit, step up to the medium version below.
PetSafe Plastic Dog & Cat Door: Best for larger cats
- Pets up to 40 lb
- Flap opening 8 1/8 x 12 1/4 in
- Fits doors 1/16 to 2 in thick
- Snap-on closing panel
- Paintable frame
The same frame and closing panel as the top pick, with a much bigger opening for heavy cats and small dogs.
Pros
- Larger 8 1/8 x 12 1/4 in flap
- Same wide thickness range
- Paintable plastic frame
Cons
- Bigger cutout needs more clearance on the door
The medium PetSafe Plastic Dog & Cat Door takes everything that makes the small version the top pick and scales the opening up. The flap measures 8 1/8 in wide by 12 1/4 in high for pets up to 40 lb, which covers large cats and small dogs.
It shares the same paintable plastic frame, the same snap-on closing panel and the same 1/16 to 2 in door fit. So if your exterior door is already thick enough for the small model, it's thick enough for this one.
The practical difference is the cutout. A bigger flap needs a bigger hole, so check for panels, stiles and hardware on the door before you mark the template.
On a paneled exterior door, the flat lower rail is usually the safest spot.
Choose it when your cat is heavy or your household also has a small dog that uses the flap. Stay with the small version if the door's usable flat area is tight.
Depets Large Cat Door: Best for four-way locking
- Pets under 17.64 lb
- Waist under 23 in
- Four lock modes
- Weatherproof exterior screen
- Brush strip for quiet closes
Four independent lock settings plus a water-resistant exterior screen make this a solid choice when you want tight control over night-time outings.
Pros
- Four lock modes including fully locked
- Water-resistant exterior screen
- Brush strip quietens the flap
Cons
- Weight and waist limits cap it at medium cats
The Depets Large Cat Door is the pick when you want the most control over when your cat comes and goes. Its four switches set swing out only, in only, both ways or fully locked, so a cat that stays in at night is easy to manage.
The outer size is 9.25 x 9.92 x 2.16 in and the cut-out is 7.7 x 8.3 in. It's rated for cats lighter than 17.64 lb with a waist under 23.62 in, so measure the waist as well as the weight.
For an exterior door, the useful detail is the water-resistant exterior screen and the brush strip that softens the flap's close. The flap is transparent, so your cat sees the garden through it.
Depets lists wood, metal, plastic, glass and rigid wire mesh as suitable surfaces.
The trade-off is depth. The tunnel is a fixed 2.16 in, so a door much thinner than that won't grip well.
Check your door's thickness against that figure before ordering.
CEESC X-Large Cat Door: Best for large cats on thicker doors
- Pets up to 25 lb
- Waist under 24.8 in
- Fits doors 1.26 to 2.14 in thick
- Four-way switch
- Rain seal and brush strip
A big opening for cats up to 25 lb, with a rain seal and an adjustable tunnel that fits thicker exterior doors.
Pros
- 7.9 x 8.7 in inner opening
- Adjustable tunnel depth
- Exterior rain seal
Cons
- Won't fit doors thinner than 1.26 in
The CEESC X-Large Cat Door is the best fit for a big cat on a thick exterior door. The inner opening is 7.9 in wide by 8.7 in high, rated for cats and small dogs up to 25 lb with a waist under 24.8 in.
Its tunnel depth adjusts from 1.26 to 2.14 in, so it bridges most exterior doors without a wobbly frame. CEESC lists windows, doors, cupboards, panels and thin walls as fair game.
The weather details are the reason to pick it for outdoor use. A transparent flap lets light in and your cat see out, an exterior rain seal sheds water, and a brush strip keeps the closing quiet.
The red and green switch tabs set out only, in only, both ways or fully locked.
Against the other large picks, this one costs more cutout area: 8.3 x 9.5 in. If your door has panels or a narrow rail, measure the flat space first.
It also won't fit a door thinner than 1.26 in.
CEESC Large Cat Door: Best for thin exterior doors
- Pets under 18 lb
- Waist under 23.62 in
- Fits doors 1.26 to 2.14 in thick
- Rotary four-way lock
- Snap-tab weatherproof brush strip
The trimmer tunnel and one-hand rotary lock suit a thinner door where you want a snug fit without a big cutout.
Pros
- Rotary lock works one-handed
- Tunnel can be trimmed to door thickness
- Fixed-groove brush strip blocks drafts
Cons
- Inner passage is smaller than the X-Large CEESC
The CEESC Large Cat Door suits a thinner exterior door where you want a snug frame and an easy one-hand lock. The inner passage is 7.1 in wide by 7.7 in high, for cats under 18 lb with a waist under 23.62 in.
Its rotary four-way lock turns with one hand to in only, out only, both ways or fully locked. The tunnel fits doors 1.26 to 2.14 in thick and can be trimmed to your door's exact depth.
CEESC upgraded the brush strip with a fixed groove and snap tabs, so it stays put and blocks wind and rain. The kit includes 16 screws, eight long and eight short, and an instruction manual.
CEESC advises screwing from both sides of the door to prevent cracking.
The trade-off is opening size. If your cat is close to 18 lb, the X-Large CEESC gives more room for a slightly larger cutout.
For a trim, average cat, this one is easier to fit and lighter to handle.
Wordcam X-Large Cat Door: Best for weather sealing
- Pets up to 25 lb
- Fits doors 1/2 to 2 in thick
- Magnetic closures
- Full brush seal
- Acrylic flap
Magnetic closures and a full brush seal keep drafts and bugs out, and the 0.5 to 2 in fit range covers most exterior doors.
Pros
- Full brush seal with magnets
- Fits doors from 1/2 in thick
- Acrylic flap
Cons
- White finish only in this model
The Wordcam X-Large Cat Door is the weather-seal pick. Its frame and flap are fully brush sealed with magnetic closures, which holds the flap shut against wind and keeps bugs and litter smells out.
It takes cats up to 25 lb. The inner size is 7.87 x 8.66 in and the outer size is 10.03 x 2.36 x 11.81 in.
Wordcam lists wood, PVC and metal doors from 1/2 to 2 in thick.
The strong ABS frame and acrylic flap are built to take knocks. The four-way knob sets in and out, in only, out only or fully locked.
A full-size cutting template comes with it, and Wordcam lists cupboards, garage doors, laundry rooms and litter box cabinets as places it can go.
The trade-off is the finish. This model comes in white only, so a dark exterior door gets a bright rectangle.
The black Wordcam below is the same door in a different color if that matters to you.
EGETOTA goTeamghjkl Cat Door Flap: Best for small cats and kittens
- Pets under 16 lb
- Waist under 15.75 in
- Outer size 7.5 x 7.8 in
- Four lock modes
- Snap-tab brush strip
A compact flap for kittens and small cats, with a small cutout that's easier to fit on a narrow exterior door.
Pros
- Small 6.3 x 6.7 in cutout
- Four lock modes
- Fits doors and thin walls
Cons
- Waist limit of 15.75 in rules out most adult cats
The EGETOTA goTeamghjkl Cat Door Flap is the smallest and easiest to fit of the sealed picks. Its cut-out is just 6.3 x 6.7 in, so it takes less flat door space than the large CEESC and Wordcam frames.
It suits cats lighter than 16 lb with a waist under 15.75 in, which means kittens and petite adult cats. A big cat won't pass through comfortably, so size this one for the smallest cat in the house, or use it in an interior door.
The four-way locking tabs set out only, in only, both ways or fully locked. EGETOTA fits a weatherproof brush strip in a fixed groove with snap tabs, so it stays seated and reduces noise.
The ABS body is weather-resistant.
The tunnel depth can be cut down to your door's thickness. EGETOTA lists interior doors, exterior doors, walls, windows, cupboards and glass as options.
The trade-off is the weight limit: 16 lb is the ceiling, so heavier cats need a bigger flap.
Wordcam X-Large Tough Cat Door: Best in a dark finish
- Pets up to 25 lb
- Fits doors 1/2 to 2 in thick
- Magnetic closures
- Full brush seal
- Black frame and acrylic flap
The same sealed build as the white Wordcam, in black, for a door where a dark frame blends in better.
Pros
- Black frame suits darker doors
- Same magnetic brush seal
- Wide thickness range
Cons
- Identical build and fit to the white version, so color is the only difference
The Wordcam X-Large Tough Cat Door is the black version of the sealed Wordcam above. It takes cats up to 25 lb, fits doors 1/2 to 2 in thick and uses the same full brush seal with magnetic closures to keep weather out.
The frame is strong ABS plastic and the flap is high-strength acrylic. The four-way rotary knob sets in and out, in only, out only or fully locked.
A full-size cutting template is included.
Its practical value is cosmetic. On a dark-stained or painted exterior door, a black frame draws less attention than a white one.
The inner size is the same 7.87 x 8.66 in.
Pick it only when color matters. Otherwise the white Wordcam above gives you the same fit and seal for less visual contrast on a light door.
Neither is the smallest cutout, so measure your flat door area first.
Ideal Pet Products Cat Flap Door: Best for very small cats
- Cats up to 12 lb
- Flap size 6.25 x 6.25 in
- Cut-out 7.5 x 7.25 in
- Four-way locking knob
- Telescoping frame for 1-1/4 to 1-3/4 in doors
A light-duty flap for petite cats, with an unbreakable LEXAN flap and a telescoping frame that adjusts without cutting the tunnel.
Pros
- Telescoping frame needs no tunnel trimming
- Unbreakable LEXAN flap
- Clear flap lets the cat see through
Cons
- 12 lb weight limit is the lowest here
The Ideal Pet Products Cat Flap Door is the light-duty choice for a very small cat. The flap measures 6.25 x 6.25 in, for cats up to 12 lb, and the cut-out is 7.5 x 7.25 in.
The flap is clear LEXAN, which Ideal Pet Products calls unbreakable, and a four-way knob sets in only, out only, free in and out or locked. That clear flap helps a nervous cat see the other side before it pushes through.
The telescoping frame adjusts to doors 1-1/4 to 1-3/4 in thick without trimming the tunnel. If your exterior door falls in that range, this is a quick fit with fewer tools.
The trade-off is the 12 lb limit, the lowest here. It's a good first flap for a kitten that will outgrow it, or a door used by a small senior cat.
A full-grown cat over 12 lb needs one of the bigger picks.
How these cat doors for exterior doors were compared
We compared the nine models on the specs that decide whether a flap works on an exterior door. The first filter was door thickness: each frame's minimum and maximum thickness, because a flap that doesn't clamp flat will rattle and leak.
The second was flap size against the cat: the opening dimensions, weight limits and, where the maker gives one, waist limits. A door rated for 25 lb is wasted on a 10 lb cat, and a 15 lb door is cramped for a 20 lb cat.
The third was weather sealing: brush strips, exterior rain seals, magnetic closures and flap material. Exterior doors face wind and rain, so a sealed flap matters more here than on a closet door.
The fourth was lock modes. Every pick here has a fully locked setting, and most add in-only and out-only positions.
The number of settings and how easy the switch is to use with one hand separated the leaders.
Our score weighs specs, features and buyer feedback against what you're shopping for.
| Product | Best for | Size | Door thickness | Flap opening | Our score |
|---|---|---|---|---|---|
| PetSafe Plastic Dog & Cat Door | most exterior doors | Small | 1/16 to 2 in | 5 1/8 x 8 1/4 in | 9.7 |
| PetSafe Plastic Dog & Cat Door | larger cats | Medium | 1/16 to 2 in | 8 1/8 x 12 1/4 in | 9.6 |
| Depets Large Cat Door | four-way locking | 9.5 | |||
| CEESC X-Large Cat Door | large cats on thicker doors | X-Large | 1.26 to 2.14 in | 9.4 | |
| CEESC Large Cat Door | thin exterior doors | Large | 1.26 to 2.14 in | 9.3 | |
| Wordcam X-Large Cat Door | weather sealing | X-Large | 0.5 to 2 in | 9.0 | |
| EGETOTA goTeamghjkl Cat Door Flap | small cats and kittens | Medium | 8.8 | ||
| Wordcam X-Large Tough Cat Door | in a dark finish | X-Large | 0.5 to 2 in | 8.4 | |
| Ideal Pet Products Cat Flap Door | very small cats | Small | 1.25 to 1.75 in | 8.1 |
What door thickness does an exterior cat door fit?
Most exterior doors fall between 1-1/4 and 2 in thick, and the best cat door for exterior door use covers that full range. The two PetSafe models accept doors from 1/16 to 2 in, while the CEESC and Wordcam frames take 1.26 to 2.14 in or 1/2 to 2 in.
The fit matters because the frame has two halves that clamp the door between them. A tunnel that's too short leaves a gap; one that's too long bows the frame.
Measure the door's edge thickness in three spots, since exterior doors are rarely perfectly flat.
Thick exterior doors over 2 in
The CEESC X-Large and Large models both allow tunnel depth up to 2.14 in. The PetSafe doors top out at 2 in.
If your door is thicker, trim the tunnel on the CEESC, or look for a door with a telescoping frame.
Thin doors under 1-1/4 in
The Wordcam doors fit from 1/2 in thick. The Depets frame is fixed at 2.16 in depth, so it's a poor fit on a very thin door.
For a hollow door in that range, the EGETOTA medium flap, which fits thin walls and doors, is the safer pick.
Which flap size suits your cat?
Measure your cat's weight and waist before you buy. The smallest flap here, the Ideal Pet Products, is rated to 12 lb.
The largest, the CEESC X-Large and both Wordcam doors, go to 25 lb. A cat near a limit should get the next size up.
Small cats and kittens under 12 lb
The Ideal Pet Products Cat Flap Door fits this group with a 6.25 in flap. The EGETOTA medium flap also works for a cat under 16 lb with a waist under 15.75 in.
Both keep the cutout small on a narrow door.
Average cats from 15 to 18 lb
The PetSafe small is rated to 15 lb and the Depets Large to 17.64 lb with a 23 in waist limit. The CEESC Large takes cats under 18 lb.
This is the widest group, so you have the most choices.
Large cats up to 25 lb
Go for the CEESC X-Large or either Wordcam model. All three are rated to 25 lb.
The PetSafe medium is rated to 40 lb, which makes it the choice for a large cat or a house with a small dog.
How do the lock modes help on an exterior door?
Lock modes let you decide when your cat uses the flap. All nine picks here have a fully locked position.
Most add in-only and out-only settings, so you can let a cat in without letting it back out.
Four-way locks vs a simple closing panel
A four-way lock is built into the flap or the frame and turns with a knob or tabs. A closing panel is a separate cover that slides over the opening.
The PetSafe doors include the panel and use a magnetic flap. The CEESC, Wordcam and Depets doors use rotary or tab switches.
When to lock the flap
Lock the flap at night to keep your cat in, or during storms to stop wind rattling it. If you want the cat in but not out, use the in-only mode.
Fully locked also keeps strays from pushing in from outside.
How much does weather sealing matter?
Weather sealing matters a lot on an exterior door. A flap with a brush strip and a magnetic or rain seal keeps drafts, rain and bugs out.
A loose flap lets cold air in and makes the door noisy in the wind.
Brush strips and rain seals
The CEESC Large uses a fixed-groove brush strip with snap tabs. The CEESC X-Large adds an exterior rain seal.
Both Wordcam doors use a full brush seal with magnets. The Depets flap has a water-resistant exterior screen and a brush strip.
Material choices for outdoor flaps
Flap materials here include clear LEXAN, acrylic and transparent plastic. Clear flaps let light in and help your cat see the garden.
The frame materials are plastic or ABS. None of the picks here list a metal frame.
What else should you check before you cut?
Check the flat space on the door first. Panels, stiles, handles and locks all block the cutout.
A flat lower rail is usually the safest spot for a flap, and on a paneled door you'll want to avoid cutting through a decorative panel.
Choosing the right spot on the door
Keep the flap clear of the door's hinges and the latch edge. Leave room for the frame's outer size, not just the cutout.
The Wordcam outer size is about 10 in wide, so measure that against the door's width.
Installing and sealing the frame
Most kits include a cutting template and screws. Cut the opening, fit the frame halves, then set the tunnel depth.
CEESC advises screwing from both sides of the door to prevent cracking. A bead of sealant around the frame helps on an exterior door.
Our guide on how to install a dog door in a screen door walks through the cut-and-fit steps if this is your first flap. For the bigger picture on picking a flap for any door, see our guide to pet doors and our best pet doors roundup.
Which exterior cat door should you buy?
The PetSafe Plastic Dog & Cat Door in small is the best cat door for exterior door use for most homes, with the widest thickness range here and a closing panel for night-time lockouts. Buy the medium PetSafe for a heavy cat or a small dog, or the CEESC X-Large for a 25 lb cat on a thick door.
The Wordcam is the pick for the tightest seal, and the Ideal Pet Products flap suits a very small cat on a thin door.
Whichever you choose, measure your cat's waist and your door's thickness before you order. That pair of numbers rules out more flaps than any feature does.
If your exterior door is paneled, read our dog door for paneled exterior door guide first so you pick a spot you can cut safely.
Our top 3 picks at a glance
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Frequently asked questions
Can a cat door go in a hollow exterior door?
Yes, if the door is thick enough for the tunnel. The PetSafe Plastic Dog & Cat Door fits doors from 1/16 to 2 in thick, which covers most hollow exterior doors.
Check the door's inner core before cutting.
Do exterior cat doors let rain in?
A sealed flap keeps most rain out. Look for a brush strip and an exterior seal, like the rain seal on the CEESC X-Large or the full brush seal on the Wordcam.
Water can still pool in the tunnel in heavy storms.
What size cat door does my cat need?
Measure your cat's waist and weight, then match the maker's limits. The Depets Large takes cats under 17.64 lb with a waist under 23 in.
Give a growing kitten room by sizing up.
Will a cat door fit a metal exterior door?
Yes, several picks here list metal doors as suitable, including both PetSafe models and the Wordcam doors. You'll need a metal-cutting blade or hole saw, and the frame must sit flat on the door surface.
How do I stop my cat going out at night through the flap?
Use the lock mode. Every pick here has a fully locked setting, and models like the Depets and CEESC give separate in-only and out-only positions.
A closing panel adds a second layer on the PetSafe doors.
How long does installing an exterior cat door take?
Plan for one to two hours for a first install. Most kits include a cutting template and screws.
You cut the opening, fit the two frame halves, then trim the tunnel depth to your door's thickness.
