Removal, sheathing and substrate findings
Removal is where the surprises are. Once the wall is open we check the sheathing and whether it’s sound, soft spots and rot (particularly under windows and at the base of walls), framing damage, previous repairs, insect damage, and anything covered over rather than fixed last time.
Findings change the scope, so a good estimate says what is included and what happens if something is found. Ask how that’s handled and priced before work starts, not after.