Stair Steps Question
The problem is you can only have so much tread overhang the next step
3/4" to a Max of 1 1/4"
So if you do not have any overhang you could put in 9 1/4" max treads
If you want larger then that you would need to modify every step
This becomes problematic as you proceed to each step
If you added 10" treads (3/4" beyond code) the next step/riser must be moved out further to meet code
So 2nd step is 1 1/4 out, 3rd is 2" out, 4th is 2.75", 5th is 3.5", 6th is 4.25"
& so on...basically any more then a few steps & you need to rebuild the entire support/stairs & stringers
And you must have a 3' landing at the bottom