Address the Seller and Introduce Yourself. 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.I'm wondering if anyone here has included a handwritten letter to the homeowner with their offer, and if they believe it changed the outcome of the sale. Make your opener as personal as possible. What Do You Need to Make an Offer on a House? The first step in making an offer on a home is to decide how much you're willing to pay for the property. It's important to stay within your budget. Your letter should explain why you're interested in buying the house and include details regarding your mortgage financing and expected closing date. We're talking about how to write an offer to purchase a home all right so how do you structure your offer to make sure that the seller accepts it. Work with your agent to submit a written offer based on local market value, specifying how and when the steps in the purchase will happen.