I do my best to accurately estimate a job. However, I don’t have X-Ray vision. Sometimes you discover things when you demolish an old kitchen, which is what happened on a current job. After we removed a wall we discovered water pipes right where a new door was going. There is always a solutions. However, sometimes that solution costs. In this case the price included parts and a half day of a plumber’s service. See photos below.

After we removed a wall we discovered these water pipes right in the way of a new door.
My plumber neatly moved the pipes to a better location.