This article explains it reasonably well.
Here’s the tour of all things Ed Sheeran house! He’s acquired multiple properties in Suffolk, creating a massive compound. Plus, he has a home in Notting Hill.
www.velvetropes.com
I think its basically privacy and his own recording studio/guesthouses/crash pads etc.
But still!!
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He may have bought more since then too. I've lost track now (because I don't really follow it). He got in trouble some years ago for failing to get proper planning permission for a pond (or something).
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Although I will add tbf that he donates a lot of time and money locally. The village primary school has benefitted hugely, as has the high school and a lot of local charities. He certainly loves the local area. He's also often popping up in one of the local pubs. He took Taylor Swift into one once