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. Craft a winning house offer letter with our customizable template and tips.Here are house offer letter samples to win a bidding war. 3 examples to use as a reference point. Learn how to write a house offer letter that will be sure to make you stand out from the competition. Ready to put a bid on your new property? Download FortuneBuilders' free real estate offer letter template so your proposal stands out. An Offer to Purchase Real Estate sets out the terms of a proposed real estate deal. Create yours now with our free form. Your letter should explain why you're interested in buying the house and include details regarding your mortgage financing and expected closing date.