Why HardiePlank estimates vary
Two homes with similar square footage can have very different James Hardie siding costs. A simple single-story wall is faster to work on than a tall home with gables, corners, decks, difficult access, and many windows.
Prep affects the final number
Old siding removal can reveal soft sheathing, missing house wrap, or poor flashing. Fixing those items during the project protects the new fiber cement siding and prevents hidden problems from being covered up.
Trim makes a visual difference
James Hardie siding looks best when trim, corners, window details, and transitions are planned as one exterior system. Those details also affect labor and material needs.
A trustworthy James Hardie siding contractor should explain what is included, what could change after removal, and how water details will be handled.