The week before they were to show up and actually start work, Scott and son showed up to build "the stairway to heaven".  This obviously gave them access to the roof.

Then on the INSIDE they also made preparations to hold the roof up while they created the opening for the stairs.  (It has already claimed one victim in the dark...)

Remember that old chimney?  It was used for a stove in the kitchen early in the previous century.  It's (mostly) gone.