I'm not sure where you're going with this. I'm not being snarky, I'm honestly confused.
When I went to buy my house, I ran into the same problem. I've never believed in credit cards, I don't take out loans and when I went to buy my house, I had the money saved up. By only buying what I have the money to pay for, I figure I've avoided a lot of trouble and saved the money I'd have to pay to the bank for a loan.
When I made an offer on the house, I ended up having to go to the bank to get official confirmation that yes, I had more than enough cash on tap to back up my offer.
I have no credit score and I am unlikely ever to have one. Gives me the willies to think of co-owning a house with a bank. I know a bank wouldn't cry over me if they had to foreclose and that's okay because I wouldn't cry over the bank if they go out of business. That's not a sound foundation for co-owning a house, in my humble opinion.
So I'm not sure what not having a credit score means except that such a person probably doesn't believe in loans.