OK, this is NOT your optimal situation. It is a "it is what it is" situation.
I will include pictures when I get home, since I am typing this while on lunch.
The floor for the oldest part of the house is supported by wooden posts which are on little metal "feet" and those sit upon the cement floor of the crawlspace/basement.
The whole setup makes me nervous, but has lasted for at LEAST the last 30 years.
I would like to replace the wooden posts wit lally columns because the wood and metal feet have seen better days.
I have read throughout the internet on how to install the posts. Most talk about pouring a cement footer for the columns. Is this needed ? If the floor has been supported by wooden posts, sitting on metal feet for all these years why can't I just install the lally columns by placing them on the cement floor that is already there, and has been doing the job ?
Please also understand, "Call a proffessional" is already an option.
The original floor may/should already have a footing in this area. You statement that there is no settling there would indicate this is so. So placing the concrete filled steel posts in the same location should not be a problem. If you want to be safe, drill a core into the concrete next to the post to determine the depth of the concrete. It must be 12".