As already mentioned, a building surveyor or structural engineer would be your first point of call and also as mentioned, they will vary so get some quotations or speak to other local people to see if they recommend anybody.
Agreed, I always called for these when getting structural problems inspected.
Make sure that who-ever you ask that you tell them exactly what it is you want a report on as otherwise they may consider you want a report on the entire house which is more expensive!
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