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.The section below should be filled out only if you intend to purchase the property. The buyer or seller can use this form to make an offer containing the sale's terms, mortgage information, and purchase price. If you're wondering where to start, check out these two house offer letter examples. House Offer Letter Example One: Formal and Professional. 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. Step 2: Purchase Price. It outlines the specific terms and conditions of the agreement and sets a deadline for when the offer expires. 3. Point out the home's attributes.