Since March 4, 2002, New York has required lawyers to give most clients a written letter of engagement “before commencing the representation,” or within a reasonable time afterward where that is impracticable or the scope is not yet known. It must contain an “explanation of the scope of the legal services to be provided,” and an explanation of fees, expenses and billing practices.
When the scope or fee changes significantly, “an updated letter of engagement shall be provided to the client.”