not my first metaversal construction, either.

ol' wakey also owns some historic buildings and units in Aether City, Ethereum's first on-chain metaverse (launched Mar '18).

https://www.aethercity.org/85

No longer being developed, but worth a gander if only for the historicity of it all (NFTs didn't formally exist yet, ICO mania was unwinding, etc).

https://warpcast.com/wake.eth/0xb65bbbbf

Can I also create ?

or do I have to ask for permission?

⧫ 🎩🖤 love ART / designer 🤍Ⓜ️ ⧫ /vlady

<3  Ξ

What is the name of the collection to explore it a little more to see if it is possible. 

I would like to do something cool

uuuuuh, hm. iirc you need to /own/ the building or unit's NFT before you can edit their interiors.

As of two years ago you could buy properties via OpenSea, but I don't know if that still works correctly.

Aether launched BEFORE NFT standards were codified (like CryptoKitties) and there are occasional problems with common-day NFT markets.

To answer your question: no permission, but you do need to own the property first.