It is not illegal, in any state of the USA, to write a letter with your offer. A home purchase offer chase in Montgomery County is oftern over 50 pages.Learn about the seven to ten basic business terms in every offer. Focus on three things: State your intentions, show that you have the financial means to make the purchase and make a personal appeal to the seller. Address the Seller and Introduce Yourself. Consider the pros and cons of writing a house offer letter in real estate transactions. Learn when to write a letter and when to avoid one. Make your opener as personal as possible. Writing a letter to a home seller can help when making an offer on a home. Have A Solid Approval from a Lender Obtaining an approval letter from a mortgage lender should be your first step in the homebuying process.