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Hire a structural engineer to determine if there is a problem that needs fixing. If there is he will give you a report and or drawing detailing what to do. Then call 2 or 3 Class A Building Contractors who are in good standing with BBB, DPOR, have sent you certificates of insurance and current references have checked out. Give them each a copy of the engineers report so they know how to qoute the work and go with the one you feel most comfortable with.
I jsut had a new house built and the concrete foundation had a settling crack that ran from the casement window to the floor. THe only way we resolved it was to hire a local basement waterproofing company (Crack-X - Natick, MA.) who utilized polyurethane injection to seal/fill the crack from the floor up to the window. It was rouhgly $700.00 for the job. Some DIY Kit info I found useful can be found at website:
Hope this is useful.
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