My husband is starting a trim carpentry business specializing in custom trim work. We would like to write letters of introduction to interior designers. I have no idea of where to start. Could anyone help?
I think that Guest may be posting from US, temico. I believe that "trim carpentry" is the word for what in BrE is known as "carpentry" (i.e. fine construction from wood) as opposed to "joinery" ( rougher construction, or framework.)

You might have a look here, guest, and see if you can adapt any of these letters.

http://www.4hb.com/letters /
What exactly is "trim carpentry" may I ask?? Before anybody can help you write letters of introduction, they must first know what your husband's business is all about, don't you agree??
 abbie1948's reply was promoted to an answer.