Hello,
I am a Geological Engineer and have a Master's degree in Geotechnical Engineering (Slope Stability).
I understand that from your description, you are facing a geotechnical problem. If you provide me as many photographs from inside and especially outside of the particular house, I can probably determine the reason(s) for this phenomena.
Although, you have to bear in mind that I will work with photos and your observations. In Geotechnical Engineering, field investigations and laboratory works following with the modelling of the related area are must be done works. In this case, I can find out the probable theoretical reason(s) and propose the most economical (if possible) reclamation solutions for you.
Looking forward to working with you.
Sincerely,
Bekir