The passport containing the previous H1B visa should have no more than 60 days of remaining validity and should not have expired more than a year prior. Employer's Letter of Support , addressed to the Visa Office of the Department of State. This letter should contain information relating to the applicant's position, the nature of the business or profession, and an explanation as to why the visa is needed. Include a list of dependents. Also, it should indicate when the assignment ends.
Fees vary depending on nationality.
This fee is in addition to any applicable visa fees. A Self Addressed and Stamped Envelope or a completed courier envelope for the return of the passports. Re-issuance can take eight to twelve weeks.