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Do you have any picture of the bed and room that you can share with me?
Do you feel any flex or bounce in the floor when you walk on it? Do small items on your nightstand jiggle when you walk by them?
What type of flooring do you have?
To get a quick idea if your floor is truly sloped, you need to get a couple of marbles or small hard balls and place them along the wall in question and see if they start rolling freely away from the wall. This is a simple way using gravity to see if the floor is actually sloped.
You can also purchase a longer 4' or 6' level and lay it on the floor. If it shows sloping, you can raise the end of the level till the bubble shows level and measure the amount you had to raise it up. That will give you the number of inches the floor drops in the 4' or 6' of your level length.
Hope this helps.
It is not natural to have a sloping floor.
Realistically, I do not think you will be able to get the builder to pay for repairs, but you can always try.
If you remove your flooring, there are some systems that can be used to float the floor (add material to) to make it level.
The 1st thing I would do is try my marble test and long level test to quantify your feeling of the floor being unlevel.
Yes, the question will remain open and you can just reply to my last e-mail to give me your findings. Talk with you soon.
Any luck with your findings?
I am still here to help when you are ready.