What Do You Need to Make an Offer on a House? The offer includes the address and the legal description of the property, sales price, closing date, concessions, and many other terms.To help you figure it all out with minimal hassle, this 3minute guide to offer letters shares insightful answers and info for homebuyers. Today we are going to talk about how to fill out a trek one to four offer. Your letter should explain why you're interested in buying the house and include details regarding your mortgage financing and expected closing date. 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. Outline the terms of your offer clearly and concisely. Let the seller know if you're offering all cash or need financing. To start, you'll need to put your intent in writing, in the form of a home offer letter. Also attached is the buyers' pre-approval letter.