Walls separating from Ceiling!

You should get a contractor to check your foundation. It sounds like your house is sinking. It may not have enough structural support

It's called settling. You have a year's warranty on all new construction. Take pictures, document everything. You builder will not want to take care of this as he will not want to take responsibility for this. A little settling is understandable, a lot is not!

File a claim with the builder, as they are still responsible. I would spend the money for an independent structural engineer or soils engineer analysis. Also look into hiring a construction defect attorney.

It is drying out, and that's the sort of thing you must expect ......

If this is a newly built home, it should be under some kind of home warranty.

The house was built in 1921. it is just been renovated. Surely it already settled...

You’re right. My house is

older than that. Sadly, , call a structural engineer. Couple of hundred $. Lots of photos.

Did you have an inspection? Did a warranty come with the mortgage? Hurry up and complain to the realtor and mortgage company and title company, the inspector and anyone else you can think of. Certified mail, with signed receipts.

Call, or better yet, visit, the town inspection office and see if they had to get permits for upgrades; every single permit. Ask innocently what improvements they needed permits for. Then, and only then, ask for copies of everything the inspector passed. And very charmingly ask the person who answers the phone who did the work, and you’re so upset and disappointed and lay it on for sympathy and information. Much more effective than anger. Everyone’s been suckered.

The problem is inexcusable. Build your case before they know you’re doing it

Can you add a picture?