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system
how far do i go with a mortgage approval process when shopping around?
user
as per my comments, i think this is up to you and how much work you want to put forth.  i do not feel it is trivial to provide documentation even with 90% of it will be the same among lenders. see this question: first answer, third and fourth paragraphs. you need to go as far as understanding the total cost of the loan, you probably need a good faith estimate.  i would also compare a minimum of three lenders.
assistant