Forgive my incorrect terminology and correct me where needed. What you are seeing in pictures is a missing foundation block exposing crawl space and exposed sill plate and rim joist. The siutation: single-story 60's era brick veneer house on a crawl with brick steps that my wife wanted removed and replaced with a small deck. My neighbor brought his smaller excavator over to remove the steps for me and in his zeal the original concrete door sill and a foundation block came out with the steps. I need to replace the foundation block and then build something up from the block to the door. I will be constructing a self-supporting deck up to the house and door so nothing below the door is expected to be very visible once the deck is built, so proper function over appearance is of concern. My two theories are mortar in a new foundation block and either: 1. Lay bricks on top of the cement foundation blocks up to the door which doesn't seem like a good idea because it wouldn't be a smooth top surface for the door. 2. My preferred theory is to fill the entire void with concrete but I know nothing about if it will crack my brick veneer over time, how to secure it so it doesn't fall out, leak water into the crawl, permit bugs, how to form it, or anything else. I am not experienced/knowledgeable about either approach. I am wanting to ensure no chance of moisture or anything that can mess up the framing behind. Ideas/opinions on best solution? With the right information I can be pretty capable but without the right information it can be a disaster.