A loan application letter for house renovation is a formal request submitted to a lender seeking financial assistance for home improvement projects. This is a sample letter to tell your landlord you need repairs.When you write your own letter, include: Use a polite tone and keep a copy for your records. Homeowners concerned about the health, safety, and energy efficiency of their home may be eligible for assistance from the Pima County Home Repair Program. Use a professional tone when writing a letter to request repairs.