I agree. I wouldn't let level dictate when a PC could begin building a small fort at least. History is full of inexperienced people that have somehow garnered power, either by wealth, or circumstance.
In my campaign world, I consider squires as 1st level fighters and knights 2nd and higher level.
It would be interesting to run a game of levels 3-5, where one of the PCs has been tasked with clearing a part of wilderness for the king.
Why wait to 9th level to have a go at it?
General gaming dicsussion