We have one budgie that we had for someone as they could not keep him anymore.
When he arrived he had a normal sized budgie cage and yes he was quite dirty with seed and feathers when he flapped his wings.
We then decided to get a larger very tall cage and it really did work as he tends to stay nearer the top and half way down and when he flaps his wings its much better.
I would imagine two would be alot more messy than one of course.

 

Thank you for replying. That certainly makes sense to use a taller cage and you look as though you're houseproud too

 

Yes!! They are messy! And a wider cage rather than tall is a much better space for your new budgies as they will have more flying room and less likely of just reaching the top and staying in the same place. The bigger the cage the better and bars of the cage should be horizontal and spaced no more than 1/2-inch apart. Cages with a flat roof offer a handy space for hanging toys, perches, etc. Avoid plastic and wooden dowel type perches, instead natural wood perches of different sizes are better as they exercise your budgie's feet and help prevent pressure sores.

 

I wish people would see budgies for what they are, small parrots
they need a wide cage rather than tall, as said above, and lots of natural climbing/roosting perches, apple branches, from a pesticide free source are great for them, theyll have great fun peeling the bark too, budgies, like all parrots love to climb and, unlike finches and canaries, fly horizontally and less often than you think
As for mess, try and get a cage with a skirt on the outside, it will help keep some of the husks contained, however, yes they do make a mess and learn very quickly that something they find fun might upset you
have you thought about a canary or finches rather than a couple of budgies? a good, strong male canary can fill the air with endless song and are less messy than a single budgie, let alone two

 

My friend had a few canaries and the boys especially had a beautiful song, but I love the finches, they are very sweet cwtshing up to each other and sound a bit like a squeaky toy!

 

loved my zebras, bred like rabbits mind, but their little soft beeping could be heard all over the close on a still day
all the local kids called them the beepers
for tiny little birds, they survived winters in the unheated ( bar an electric light bulb in the inside cubby) aviary extremely well and stood up to the cockies like the little buggers they are

 

If you keep the cage on a table and have smooth flooring, I don't think it's too bad. You can brush up the worst of it from the table and little seed shells and feathers sweep up easily. If done every day, it'd be easy to keep on top of. If you put it on a small stand above carpet, though, I imagine it'd all get ingrained in the carpet.

 

I am no budgie expert but ours does seem quite happy in his taller cage and he does hop and fly around top to bottom with ease.
But as I say I'm no expert.......just doing what I thought best for him at the time