Make your opener as personal as possible. Do you know how to write an offer letter for a house?We're here to teach you the ins and outs to improve your chance of closing a deal. View the forms library. 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. A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction. Strengthen your bid with a compelling offer letter to the home seller. Pennsylvania Free Letter of Intent ( LOI ) Template. Utilize our Letter of Intent to formally express your desire to buy a product or service. Craft a winning house offer letter with our customizable template and tips.