How To Write A Letter Applying For A Loan . In this loan application letter sample, the owner of a decorating business is requesting a loan in the amount of $25,000.00 to expand her warehouse space. A loan application letter is written to by an individual who requires finances to cater for a specified need. 17+ Sample Loan Application Letters PDF, DOC Free & Premium Templates from www.template.net Here is a sample letter based on the above format. The purpose of this letter is to request a personal loan in the amount of $6,000. A good application letter will include the entire sequence of proceedings leading up to the event that necessitated the application.