Hi, akash9!
You might not have to write a letter, but that would depend on a number of factors that are unknown here. However, having some documentation as to what you do is helpful if a potential customer wants to have something in-hand concerning what it is that you do.
If you give us a little bit more information as to the type of construction it is that you do, that would be helpful. Also, is your business going to be just local, or are you wanting to go out to places that might be far away, please?
Thanks!
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