9 Best Cat Door for Exterior Wall (November 2026)
The best cat doors for exterior walls include the PetSafe Plastic Dog & Cat Door for most homes, the CEESC X-Large Cat Door for Pets up to 25 lbs for large cats, and the PetSafe Plastic Dog & Cat Door for two cat homes.
On this page (9 sections)
- The best cat door for exterior wall jobs
- How these cat doors compare
- How we compared these cat doors for exterior walls
- What wall thickness do you need to measure?
- Which size opening does your cat need?
- Do you need a lock for night and weather?
- How do you plan the cut through an exterior wall?
- Wall tunnel or door flap: which suits your home?
- Verdict
The best cat door for an exterior wall is the PetSafe Plastic Dog & Cat Door in small, a 5 1/8 x 8 1/4 in flap with a snap-on closing panel and a paintable frame. If your cat leaves through a solid brick, drywall or wood wall, the Decormax Cat Door for Wall is the pick, because its steel tunnel spans walls 3 9/10 to 7 7/8 in thick.
Wall, not door, is the key word here. A door flap only helps if that door opens to the outside.
A wall tunnel works where the cat's route leaves through masonry, and it keeps the human door closed and locked. That single difference splits the list.
Half of these fit wood, PVC, metal or paneled doors and thin walls up to about 2 in. The other half are true tunnels built for a hole cut through the wall itself.
Our picks at a glance
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Check itDepets Medium Cat Door Interior/Exterior Door
Best for renters - 5
Check itCEESC Large Cat Door for Interior/Exterior
Best for weather sealing - 6
Check itAmazon Basics Adjustable Plastic Dog and Cat
Best for walls and doors - 7
Check itWordcam X-Large Cat Door for Interior/Exterior
Best for cold weather - 8
Best for brick and drywallCheck it - 9
Check itClawJaw Small Exterior Wall Steel Cat Door
Best for chews and claws
The best cat door for exterior wall jobs
The PetSafe small flap wins for most homes because it is simple, cheap to replace and fits any door up to 2 in thick. The Decormax and ClawJaw take over when the exit is a real wall.
PetSafe Plastic Dog & Cat Door: Best for most homes
- 5 1/8 x 8 1/4 in flap opening
- Snap on closing panel
- Paintable plastic frame
- Fits doors 1/16 to 2 in thick
A small, simple flap with a locking cover and a frame you can paint. It suits wood, PVC, metal or paneled doors and is the cheapest way into the wall project.
Pros
- Snap on closing panel
- Paintable frame
- Cutting template included
Cons
- Small size suits pets up to 15 lb only
- Magnetic flap is not a full weather seal
PetSafe's small plastic door suits the average indoor cat that goes out through a back door or a paneled wall. The flap opening is 5 1/8 x 8 1/4 in, sized for pets up to 15 lb, which covers most adult cats with room at the shoulders.
The snap-on closing panel is the practical part. It slides over the opening when you want the cat in for the night or a storm, and it keeps stray cats and wildlife out.
It also lets you close the opening when you leave the house, so the flap is not free for anything passing by.
The white frame takes paint, so a door on a colored exterior wall blends in. Installation is a cut with the included template, then screw the two frames together.
The kit includes the exterior frame, interior frame with flap, nylon screws, hex nuts, plastic core covers and the snap-on cover. The door depth range is 1/16 to 2 in, so it covers a standard exterior door and a thin panel wall.
The trade-off against the CEESC flaps is the lock. There are four switch modes on those and only a cover here.
Against the wall tunnels, this is a surface mount, not a through wall kit. The upside is weight: at 13.28 oz it is a light door that hangs easily on a hollow door.
CEESC X-Large Cat Door for Pets up to 25 lbs: Best for large cats
- 7.9 x 8.7 in inner opening
- Four way switch
- Exterior rain seal
- Fits 1.26 to 2.17 in thick
The biggest plastic flap here, with a 4-way switch and a rain seal. It fits windows, doors, cupboards and thin walls up to about 2.17 in.
Pros
- Wide inner opening for big cats
- Four way locking switch
- Rain seal and brush strip
Cons
- Thin wall depth only
- Cut-out is larger than most small flaps
The CEESC X-Large suits a big tom or a Maine Coon mix that would not clear a small flap. Its inner opening is 7.9 x 8.7 in, specified for cats and small dogs up to 25 lb with a waist under 24.8 in.
The 4-way switch sets out only, in only, both ways or locked, using the red and green tabs. That matters for a cat that is shut in at night, since you can leave it on in only and let the cat return without letting it out again.
The tabs sit on the door face, so setting them means bending down each time.
An exterior rain seal and a brush strip give this flap weather protection beyond a plain flap. A transparent flap lets the cat see the yard before it pushes through.
CEESC also says it can go in windows, doors, cupboards, panels and thin walls, with an adjustable tunnel for 1.26 to 2.17 in surfaces.
It is not a brick wall kit. The outer size is 9.8 x 11 in with a 2.15 in depth, so it cannot bridge a hollow wall cavity.
Against the Decormax it cannot span thick masonry, so choose it when the route is a door or a thin partition.
PetSafe Plastic Dog & Cat Door: Best for two cat homes
- 8 1/8 x 12 1/4 in flap opening
- Snap on closing panel
- Paintable plastic frame
- Fits doors 1/16 to 2 in thick
The wider PetSafe flap for households where more than one pet shares the opening. The same paintable frame and snap cover, in a medium size.
Pros
- Roomy opening for two cats
- Snap on closing panel
- Paintable frame
Cons
- More cold air moves through a big flap
- No locking switch, just a cover
The medium PetSafe is the same door as the small, scaled up to a 8 1/8 x 12 1/4 in flap for pets up to 40 lb. In a cat-only home it suits two cats that push through at the same time, or a very large breed.
The extra width costs you in drafts. A bigger flap moves more air, and this one closes with a snap cover rather than a brush seal.
On a cold exterior wall, the Wordcam or CEESC Large seals better. It is also noticeably heavier than the small version at 2.5 lb, so plan on a solid door rather than a flimsy panel.
Where it wins is durability of the design. Same paintable frame, same template, same two-frame screw assembly as the small version, and the same 1/16 to 2 in door range.
The frame is listed as metal and plastic, so the screws bite into a stiffer surround.
Choose it if a dog also uses the opening, or if your cat is broad across the chest. For a single average cat, the small size is the better fit and the cheaper cut.
The snap cover also works as a night shutter on the same flap.
Depets Medium Cat Door Interior/Exterior Door: Best for renters
- 5.9 x 6.3 in inner opening
- Four way switch
- Fits surfaces up to 50 mm thick
- Brush strip
A small, budget flap with a 4-way switch and a forgiving cut-out. It suits a panel, cupboard or thin wall that you can fill and patch on move-out.
Pros
- Low cost
- Four way locking
- Tolerates a rough cut-out
Cons
- Inner opening is tight for big cats
- Not built for thick masonry
The Depets medium flap suits a renter or a first-time installer. Its inner opening is 5.9 x 6.3 in, for cats up to 15 lb with a waist under 15 in, and the cut-out is 6.3 x 6.7 in.
One practical point from Depets: as long as your hole is smaller than the outer frame and larger than the inner frame, the door fits. That forgiving margin helps when a first cut with a jigsaw wanders.
The outer size is 7.5 x 7.8 x 2 in, so the lip covers a slightly ragged hole.
The 4-way switch covers out only, in only, both and locked, and the transparent flap lets the cat see through. An exterior screen on the flap is there to resist water, and a brush strip quiets the close.
Depets also gives a fix for a stiff flap: smooth the hinge pin, or check the brush seal if the cat still will not push through.
It suits any wall or door up to 50 mm thick. That is about 2 in, so it is a thin wall or door product, not a masonry tunnel.
It weighs just 9.92 oz.
CEESC Large Cat Door for Interior/Exterior: Best for weather sealing
- 7.1 x 7.7 in inner opening
- Rotary four way lock
- Fixed groove brush strip
- Fits 1.26 to 2.14 in thick
A black flap with a brush strip held in a fixed groove, which keeps wind and drafts out better than a plain flap. The rotary knob locks four ways.
Pros
- Brush strip in a fixed groove
- One hand rotary lock
- Trimmable tunnel depth
Cons
- Tunnel suits thin walls only
- Black frame shows marks more than white
The CEESC Large is the weather pick for a door or thin wall. Its brush strip sits in a fixed groove with snap tabs, so it stays put and blocks wind and rain instead of sagging loose.
If the strip ever comes free, CEESC says it pushes back into the groove.
The opening is 7.1 x 7.7 in for cats with a waist under 23.62 in, typically under 18 lb, in a 9 x 10.6 in frame. A rotary knob switches in only, out only, both or locked with one hand, which is easier than two small tabs on a cold morning.
CEESC makes the tunnel depth adjustable for doors 1.26 to 2.14 in and says you can trim it to your thickness. Screws go in from both sides to stop the door cracking, a step worth following.
The kit includes 16 screws, 8 long and 8 short, for that two-sided fix.
The black finish is the real trade-off. It looks sharp on a dark door and shows paw marks on a white one.
Against the Wordcam, this is the smaller, cheaper frame for an average cat, and its 18 lb limit leaves the XL to the big cats.
Amazon Basics Adjustable Plastic Dog and Cat: Best for walls and doors
- 7.5 x 11.5 in entrance
- Adjustable tunnel
- Plastic frame
- White and grey finish
A middle sized flap sold for both doors and wall spaces, with an adjustable tunnel. The white and grey frame sits quietly in a painted wall.
Pros
- Works on doors or walls
- Adjustable depth tunnel
- Neutral two tone finish
Cons
- Entrance is tall for cats alone
- Plastic frame suits lighter use
Amazon Basics sells this one for doors or wall spaces, with a 7.5 x 11.5 in entrance and an adjustable tunnel across a 10.5 x 15 x 3.9 in frame. That makes it a bridge between the door flaps and the wall tunnels.
Suited to a household with a cat and a small dog sharing one opening, or a cat that is midway in size and would rattle around a small flap. The durable plastic frame is built for general weather rather than extreme cold.
The white and grey finish suits a garage wall, a utility room or a painted siding panel. All fittings and instructions come in the box, and the adjustable tunnel lets it grip a range of wall thicknesses.
The entrance is tall at 11.5 in, so it clears a cat's back without scraping and leaves room for a small dog.
It is not a brick tunnel. The 3.9 in overall depth is the frame, not a masonry span, so a solid wall still needs the Decormax or ClawJaw.
The plastic frame is a light 2.9 lb build, which suits lighter use but not a chewing dog.
Wordcam X-Large Cat Door for Interior/Exterior: Best for cold weather
- 7.87 x 8.66 in inner opening
- Four way rotary lock
- Fully brush sealed
- Fits doors 1/2 to 2 in thick
An extra large flap with an acrylic panel and a full brush seal. It suits a big cat in a cold room where drafts cost money.
Pros
- Full brush seal and magnetic closure
- Acrylic flap
- Extra large opening
Cons
- Not for thick walls
- Larger frame needs a bigger cut
The Wordcam X-Large fits a 7.87 x 8.66 in inner opening for cats up to 25 lb, in a frame that suits interior wood, PVC or metal doors 1/2 to 2 in thick. It is the pick for a cold utility room or a garage door.
Wordcam makes the flap from high strength acrylic with an ABS frame, and fully brush seals it with magnetic closures. The claim is total weatherproofing, minimum energy loss, less noise, fewer bugs and less litter smell.
The acrylic panel is clearer than a plain plastic flap, so the cat sees the other side without hesitating.
The 4-way rotary lock sets in and out, in only, out only or locked. A full size cutting template comes with it, and Wordcam lists cupboards, garage, laundry room, closet, bedroom and bathroom doors as good spots.
The outer size is 10.03 x 2.36 x 11.81 in, so it needs a fairly large square.
It is a door flap, not a wall tunnel, so keep it for the door itself. Against the CEESC XL, this one has the flatter frame and the more complete brush seal, but the CEESC fits the same thin surfaces with a smaller cut.
Decormax Cat Door for Wall: Best for brick and drywall
- Fits walls 3 9/10 to 7 7/8 in thick
- Steel frame
- Double magnetic flaps
- Sliding lock panels
A real wall tunnel with a steel frame that spans a thick brick or drywall wall. Double flaps and sliding locks seal it against wind and rain.
Pros
- True wall tunnel for masonry
- Steel frame resists chewing
- Double flap and sliding lock
Cons
- Needs cutting a hole through the wall
- Steel frame is heavier than a door flap
The Decormax Cat Door for Wall is the first true exterior wall pick. Its steel tunnel spans walls 3 9/10 to 7 7/8 in thick in brick, drywall or wood, with a 13 9/10 x 9 2/5 in frame and a 9 1/4 x 6 1/2 in opening for pets up to 22 lb.
The rust-proof steel frame is the point. It stands up to chewing, clawing and years of wear in a way a plastic door frame cannot, which matters on a wall where a raccoon or a determined dog may push.
The alloy steel build also holds its shape when the tunnel is extended across a thick wall.
Weather sealing comes from double magnetic flaps and dual sliding lock panels. The three modes are full open, full lock and partial open, the last letting air move while the cat stays in.
The double flap creates an air gap that slows drafts better than a single panel.
The cutting template and written guide make the hole doable with a saw. Swapping the flaps for cleaning is simple.
If you want the same exit but a metal finish to match, the ClawJaw is the close twin.
ClawJaw Small Exterior Wall Steel Cat Door: Best for chews and claws
- Fits walls 3 9/10 to 7 7/8 in thick
- Metal frame and tunnel
- Double flaps
- Sliding lock panels
A black steel wall tunnel in the same size class as the Decormax, for a cat that scratches and chews at the flap.
Pros
- Metal frame and tunnel
- Double flap weather seal
- Sliding lock panels
Cons
- Black finish is darker than most walls
- Same cut-out as the Decormax
The ClawJaw Small Exterior Wall Steel Cat Door is the black steel version of the same wall kit. It fits walls 3 9/10 to 7 7/8 in thick, with a 9 1/4 x 6 1/2 in flap and a 13 9/10 x 9 2/5 in frame for pets up to 22 lb.
Its metal frame and telescoping tunnel are aimed at strength. ClawJaw says the double flaps and sliding lock panels give weatherproofing against extreme weather and cut drafts from the outside air.
The telescoping tunnel is the piece that adjusts to your wall, so the same kit covers a 4 in stud wall and a 7 in brick build.
Installation works in interior and exterior walls with the included templates. The frame material is metal rather than plastic, so the finish stays cool in shade and does not fade in sun the way some painted plastic does.
Choose it over the Decormax for a black wall or a shed where the darker frame disappears. The two are otherwise close, with the same cut-out and the same 22 lb limit, and the score here is a touch lower on the finish.
How these cat doors compare
The table lines up the wall depth, opening size and lock type, which are the three numbers that decide most of these choices. Read down the wall column first.
| Product | Best for | Size | Flap opening | Door thickness | Our score |
|---|---|---|---|---|---|
| PetSafe Plastic Dog & Cat Door | most homes | Small | 5 1/8 x 8 1/4 in | 1/16 to 2 in | 9.7 |
| CEESC X-Large Cat Door for Pets up to 25 lbs | large cats | XL | 9.7 | ||
| PetSafe Plastic Dog & Cat Door | two cat homes | Medium | 8 1/8 x 12 1/4 in | 1/16 to 2 in | 9.6 |
| Depets Medium Cat Door Interior/Exterior Door | renters | Medium | 9.5 | ||
| CEESC Large Cat Door for Interior/Exterior | weather sealing | Large | 9.4 | ||
| Amazon Basics Adjustable Plastic Dog and Cat | walls and doors | Medium | 9.3 | ||
| Wordcam X-Large Cat Door for Interior/Exterior | cold weather | XL | 0.5 to 2 in | 9.0 | |
| Decormax Cat Door for Wall | brick and drywall | 8.9 | |||
| ClawJaw Small Exterior Wall Steel Cat Door | chews and claws | 8.4 |
Our scores weigh the specs, features and construction against what you need from an exterior wall door. A plastic flap scores lower than a steel tunnel for a brick wall because the job is harder, even if the flap is well made.
A door flap with a four-way lock earns its place over a cover-only flap in a house where the cat goes out at odd hours.
How we compared these cat doors for exterior walls
We checked the wall or door thickness range, the flap opening, the frame material and the lock modes for every door here. Then we matched each one to the wall type it can actually handle.
A door that fits a 2 in door cannot make a tunnel through an 8 in brick wall. That is why the list is split by mount, and why the top pick is called out for most homes rather than for every wall.
The wall thickness figure is the one that rules a product out fastest.
What wall thickness do you need to measure?
Measure the wall from the inside face to the outside face, including render or siding. Wall doors here need a tunnel that covers that depth, from 3 9/10 up to 7 7/8 in on the Decormax and ClawJaw.
Door flaps are far shallower. They fit a human door 1/16 to 2 in thick, or a thin partition wall with the same depth.
If your wall is 6 in of brick, a door flap will not reach through it. Measure in three spots, because old walls are rarely even.
Thick brick or block walls
A thick brick wall needs a tunnel kit like the Decormax or ClawJaw, which span up to about 8 in. Expect to cut a neat square hole and line it with the tunnel.
For the wider project, our guide on a dog door for wall covers siding, stucco and brick in more detail.
Thin walls, panels and doors
A stud wall, siding panel or exterior door takes any of the plastic flaps, which suit surfaces up to about 2 in. The CEESC, Depets and PetSafe doors all fit this range.
A hollow interior wall is the same job, so a flap works there too if the cat only needs room to room access.
Which size opening does your cat need?
Measure your cat around the chest and add about an inch. Small flaps near 5 to 6 in wide suit cats up to 15 lb, and large flaps near 7 to 8 in wide suit cats up to 25 lb.
The size in the product name does not always match your cat. A "medium" Depets opening is 5.9 in wide, while the "small" PetSafe is 5 1/8 in.
Compare the opening number, not the label. Waist figures matter too, since a cat with a wide middle can clear the height but jam on the width.
Standard cats under 15 lb
The PetSafe small, Depets medium and CEESC Large openings all handle an average cat. The PetSafe small is the simplest and the Depets is the tightest.
The CEESC Large gives the most shoulder room in this group.
Large cats and multi cat homes
Go for the CEESC X-Large, Wordcam X-Large or PetSafe medium when the chest is broad or two cats share the exit. The 7.9 in CEESC opening and 8 1/8 in PetSafe medium leave the most room among the door flaps.
The wall kits at 9 1/4 in wide suit a big cat too, though their 22 lb limit caps the weight.
Do you need a lock for night and weather?
Yes, if your cat goes out in the evening. Most doors here have some form of lock, from a snap cover to a 4-way switch or sliding panels.
The lock style decides how fast you can shut the opening.
Four way rotary and tab switches let you block one direction and allow the other. Sliding panels on the wall kits close the opening fully.
A snap cover on the PetSafe doors does the same by covering the flap. For a cat that likes to sit outside at dusk, an in-only setting is the safer choice than a full lock.
How do you plan the cut through an exterior wall?
Plan the cut so the door sits away from pipes, cables and studs, and keep it at a height your cat can reach. The wall kits include a cutting template, and several of the plastic flaps come with one too.
Mark the rectangle from the inside, then check the same spot from outside before you cut. A level line and a pilot hole stop the two faces drifting apart on a thick wall.
On a wall tunnel, the hole needs to run square through both skins, or the tunnel will not sit flush.
Cutting drywall and wood
Drywall and wood cut quickly with a drywall saw or a jigsaw. The tunnel then covers the raw edges, so the finish is neat even if the cut is a little rough.
Check for studs and wires with a detector before the blade goes in.
Cutting brick and block
Brick and block need a masonry drill, a cold chisel or an angle grinder with a diamond blade. If the wall is structural, get a builder to check before you cut.
Our post on whether you can you put a dog door in a brick wall covers the structural side. A cavity wall also needs the tunnel to bridge the gap, which the Decormax and ClawJaw do.
Wall tunnel or door flap: which suits your home?
A wall tunnel is the right pick when the room's only outside wall is solid and the human door leads to a hallway. A door flap is the easier pick when an exterior door already opens onto the garden.
Wall tunnels cost more work but keep the door locked and the draft away from the main opening. Door flaps are simpler, cheaper and easier to patch if you move out.
Weigh the cut you can undo against the convenience your cat gets every day.
If you want to compare a flap for a human door against the wall kits, our list of the best cat door for exterior door pairs with this one. For a mixed dog and cat home, the wider pet door roundup covers bigger openings.
Verdict
The best cat door for an exterior wall depends on which wall your cat uses. For a human door or a thin panel, the PetSafe Plastic Dog & Cat Door in small is the pick, with a simple flap, a snap cover and a frame you can paint.
For a real brick, drywall or wood wall, choose the Decormax Cat Door for Wall, whose steel tunnel spans 3 9/10 to 7 7/8 in. Pick the CEESC X-Large for a big cat, the Wordcam for a cold room, and the ClawJaw for a black steel finish.
Our top 3 picks at a glance
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Frequently asked questions
Is it better to put a cat door in a wall or a door?
A wall is better when your cat's outdoor route is through a solid wall, since a door flap only works if that door leads outside. A wall tunnel also keeps the human door intact.
Choose a door flap if an exterior door already opens onto the yard.
How big should the opening be for my cat?
Measure your cat around the widest part of the chest and add about an inch, then compare that with the flap opening. Small flaps around 5 to 6 in wide suit most cats up to 15 lb.
Bigger cats need an opening 7 to 8 in wide.
Can I fit a wall cat door myself?
Yes, if the wall is drywall, wood or a single brick skin you can cut with a template and a saw. The tunnel kits here include a cutting template.
Hire a builder for a double brick or load-bearing wall, where the hole needs lintel advice.
Do wall cat doors let cold air in?
Less than an open hole, but more than a closed window. Double flap wall tunnels and brush sealed flaps cut drafts most.
A magnetic flap helps it close flush, though no flap is airtight.
What stops other animals using the cat door?
The sliding lock panels and closing covers on these doors let you shut the opening at night. None of them reads a microchip, so a determined raccoon can still push a flap that is left open.
