I am going to restate this question as the grammar used makes it a bit difficult to understand your true intentions. I am going to assume for a moment that you meant to ask:u201cHow do I express my INTENT to purchase a house that is not for sale BY its owner.u201dIf that is not the case, please explain in the comments to this answer.You send them an actual offer. Pure and simple. If you actually want to buy it, you find an attorney or an agent who can write an offer on the property and leave it to the professional to determine how best to deliver the offer after you have signed it.It is rare that someone actually wants to BUY a house sight unseen, but I have seen it happen several times. Usually it is a piece of land or a house on a piece of land that the buyer wants to possess. The actual house on it then becomes irrelevant and the buyer does not need to decide based on being inside the house of it.This is done all of the time and you need to write a very STRONG offer and often with a u201cnon-refundableu201d deposit. These types of offers are done most often by builders who send them to 6 owners when only intending to purchase 2 or 3 of them. They pay a non-refundable deposit to all 6 with a 6 monthu2019s to close contract. It is how they keep projects in their pipeline on a continuous basis so that they do not have any down time.When you say u201cwho do I express my MEANS to purchaseu201d you are suggesting that you need to prove to them that you have the u201cmeansu201d to buy it. That you have the money to buy it. That is a different issue altogether and often purchases of this kind are cash purchases and not financed purchases. Proof of Funds to purchase doesnu2019t happen until after you get the owner to agree to sell it.Everything is for saleu2026if you are willing to pay the right price to cause that to happen. Often you have to pay a premium to buy a property that is not for sale. Sometimes you can offer a fair price with unusual terms. But if you donu2019t KNOW for sure that you want to buy it or have the means to buy it, sometimes itu2019s better not to drag other people into your fantasies. TEST your desire and ability to purchase by going to a professional to write the offer. If they wonu2019t write it and deliver it because what you are proposing is not realistic, then you wonu2019t have to bother the owner unnecessarily.If you want to pradditional details as to why you know you want to buy this particular property without having seen it, I would be happy to expand the answer accordingly.