Originally Posted by nealtw
If you don't want to buy a new ladder, bolt on extention legs made out of 2x4.
Yes, for a ladder oriented on a staircase as shown, using two of these
or make your own from two mending plates and two carriage bolts. A 2'x3' may even be strong enough.
I have two straight ladders, 14' and 9', and so now I have to see if these will fit in the customers staircase.