Often, they also will want one or two sample chapters.
You can send your prospectus to as many publishers as you like.
You need to assess whether it makes sense and adds something to your argument.
There is no unequivocal solution to the place that methodology occupies in a book.
It will often depend on the discipline in which you are writing and how sensitive your potential audience is to methodological questions.
Generally, scholars in SPS may pay more attention to methodology than, let’s say, law researchers.
Turning your doctoral thesis into a publishable book will require some adjustments and adaptation of the content and style.
you are probably thinking of turning your dissertation into a book. Working on your first book is something that you may want to do during a post-doc fellowship (see our career tip on applying for a post-doc).