Men who do this for their wives are loved and appreciated! My husband built one for me at some expense and I am so grateful to him. Love love love for him my best friend!!!!

I am so happy to see someone make a catio without going overboard on the materials.  Some notes of others are looking into these:
- It is worth the wait to stain the wood before assembly.
- Instead of U nails to fix the fencing to the wood you can use a staple gun, the longer the staples it can drive, the better.
- Design to the lumber size.  Here they used 8 ft wide panels and 4 ft rolled steel wire so few cuts.  Can leave side panels 8 ft tall to decrease cutting more but will need more fencing.
- Look for multi use, so if you want a screened in outdoor sitting area, use pet and insect screening instead.
- More complicated things like doors you can buy pre-made if you aren't very handy.
- They didn't use steel wire panels but a roll which saved a LOT of money.  You can probably go up to 2" by 4" wire mesh.
- If you're not as concerned with the final look, can save money using chicken wire.
- Corners here might not stand up over time, or you might not be as handy with assembly.  Can cut triangles from thin plywood to put at each corner of the panels to stiffen them.
- You might want to cover part of it later, so put the top at a slight angle.  Then if you want to cover part of it, you can use thin plywood or just a tarp.
- Ground swell might be an issue in some areas so put might set it over a gravel trench.
- Allow some access doors in long walkways for access - I recommend every 4 ft so you can reach easily.
- Scrounge, notice they had 1 fixture some steps and a barrel, another a large cutting from a tree.  If you had a wind spinner, you could connect this to a string and toy to keep the cats busy when the wind blows.
- Definitely need a cat door to keep insects out.
- If the entire path is covered and close, can move the catbox outside.
- Bird feeders and bird baths near the catio keeps them occupied.
- If it will also serve as a dog run or you are concerned with other animals digging in and then accessing the house, dig a trench, extend the fence into the ground at least 6 inches (prefer up to 1 ft), and fill with gravel around it to discourage digging.  Also if it will be for a dog as well then put the fencing on the inside of the braces rathr than the outside (harder for larger animal to push through).

If you are going with a really large area, consider using steel piping instead of larger size lumber, placing the bottom in holes with poured quickrete.
- The price will be comparable or cheaper with pipe.
- If really large runs aren't sturdy enough, can place a slightly smaller pipe in a larger one to double the wall thickness - I used this to make a weight bench bar.
- It has less maintenance.
- You can space out the supports further so you don't need as many inside supports.  
- You can buy clips, or just weave a wire around the fence mesh, or cut the outside wire and loop, to make two section of wire into 1 (two 4 ft sections into 1 8 ft wide fence section).
- You can buy threaded fittings for the joints.
- Threading the pipe is easy and there are lots of Youtube videos to show you how.
- You can even use the fittings and short sections of pipe to make elevated platforms, etc. and U-bolt wood for the walkways.
- Consider a miter box to make it easier to cut piping square.

Now your cats can become peeping Toms as they peer into the neighbors windows! 🤣😻👏👏👏

This is one of the nest catio build videos I've seen.  Most just say "how to build" as clickbait, then show you their finished catio.   This is very clear, shows how you solved issues and makes it seem very doable. Thank you!

Poor doggy at the end was like I want to come in too lol. Great build thanks for sharing

Cats:  All of this, just for us?!
Also cats:  about time...

Fantastic build. Quick and simple. Love the cats' first reactions on entering their new domain.

So well built!  And on grass! You see so many of these built on concrete.

Loved the build but had to mute that horrible music.

It's the eyes... Chico... You could really see the reaction in their eyes...wow! Is this for real!!! Wonderful ❤❤❤

Very nice.  Glad you let them be on the ground (not wood decking). Plant a little shrub in there.  Cats love lounging under shrubs.

So cute, the whole family is working on it, even the doggie 😀👏

Good video but the most annoying music ever. Had ton turn that off.

Very nice outdoor space for your kitties. The black one looks majestic.

Super Cool
The Black Cat had the Look of
Ok You tricked me  I'm outside but I'm not free Darn
But it's totally ok Cause I'm outside

Nice video ... as long as you ((MUTE)) the annoying music that sounds like the record stuck.

Beautiful black kitty

Thanks for sharing!  I’ve been thinking about fostering cats/kittens and having an outdoor space would be awesome!  I’ll be watching the next one on how it’s decorated ❤️

your black cat is so beautiful. reminding me of mine when he was still here.

Dog "Darn, there I was thinking you were building it for me" . . . :  (