Can a manufacturer claim for late design changes after production has started?

Late changes hurt more in a factory than on paper. Parts already cut or ordered may be wasted, and the line may stop or need a new sequence.

Record the date the change arrived, the stage of production on that date and the quantity affected. Keep the old and new drawing revisions side by side.

Price three things: material that cannot be reused, labour spent twice and idle machine time. Add the cost of any rush order used to recover the date.

Check the order terms for a change clause and a notice period. Send the notice with the revision list and a first cost, then update it as the numbers firm up.