I'm working on my deck rebuild. The last one had lots of issues with rotting etc.
In my plans, I have to have a set of foundation piers that are less than 5 feet from the house foundation. Unfortunately, my county code requires that I dig the piers to be at the elevation of the house foundation. That means I'll be going down to 6.5 - 7 feet!
I'm not sure why this is the requirement given that anything greater than 5' from the house can be at the frost line (~24").
I'm meeting with the county review office tomorrow to see if there are alternatives so I don't have to go so deep.
If I do have to go 6.5 - 7 feet deep, I'm looking at using a Toro Dingo (mini Bobcat) with a 7' auger bit. This should be fun!