We just recently decorated our dining room. We had the diningroom window open (very small) and the door to the kitchen and kitchen window open. Birds were kept upstairs with a towel pushed against the door edges to try and block any stray fumes but had the bedroom window open (opposite sides of the house so no 'circulation') windows were cracked open all evening and the dining one through the night too (as bunnys were moved back in there LATE evening.)
We used low VOC paint too, otherwise would have had the birds.
If you can put him on the balcony with a towel covering half his cage so he has shade and a bit of protection, I think that would be best. Rquest low VOC paint though (most are these days as they're more eco friendly!).
Made an image up so you can better see what went on in our house (didn't add the bathroom on to the other side of the kitchen because it wasn't relevant, we do have one though!

)
Apparently the "master bedroom" part got jumbled somehow. Supposed to read
"Master bedroom: Door sealed off, window open for 'freshness' more than anything. Budgie's, Merlin and our Gerbil kept there as they were most at risk pets. Door not opened during the decorating or for a few hours afterwards.
All our animals were completely fine with this and we did 'scent' check the room every once in a while to see if
we could smell any fumes ourselves (big red flag if we can and birds would have been evacuated immediately!). Having lost birds to fumes many years ago (bloody grandparents painting around my budgies :'() I'm all too aware of the dangers! Luckily, like I said. Low VOC paint is more and more common and so if you take all the precautions (like I had done) you should be a-okay with your bird still in the house
For anyone curious by the way: Bunnie's and our Gerbil are housed in the dining room (aka. bunny room) and the birds are housed in the "2nd bedroom". Merlin's just been relocated to share our bedroom again now though and I'm currently more poorly with my health issue so I'm spending time with him through the cage, but still being in bed.

But yes, pets all have their own rooms. Spoilt brats