Where to find neighbourhood permits for roof patios? & how long do they last?

Hey All!

I'm trying to find the building permit for my neighbours house. We both live on the top floor of a residential building. We both currently have large patios that are side by side coming off of the side of the house (not on top of our homes). We've got plants & so do they so honestly, we rarely even notice when they are out. We've seen them in passing a bit and are always friendly but don't know them well due to a language barrier (I don't speak much Dutch (but trying!!) & they speak only a verrry small amount of dutch. I've watched them bring up building supplies all week and when I ran into him on the street, I asked what they were building. After some struggling we got to "building patio".

I'm not sure if they are fixing the existing patio off of the top floor or building out a full patio on the roof above. A patio on the actual roof would limit the sun to our patio a bit and would definitely remove some of the privacy we currently love. I'm not really worried as we get a ton of sun and could easily get a big umbrella for privacy. However, I'd like to know what is coming and how big of a project it'll be. I tried to Google permits for their address & nothing is coming up. I've search on zoek.officielebekendmakingen.nl but there are no permits in 2023/2024/2025 on the site.

There's a permit from 2021 for "realization of a roof conservatory extension on the attic floor and realization of a roof terrace on the existing roof of the attic floor" but surely that's not still valid? They do have plants on their roof but I can't see if there's proper flooring or what's actually up there. Could the 2021 permit still be usable to build a full roof patio or would there be a more recent permit? Where could I find that?