Wellholt shows a low, a typical, and a high so you can read a quote before you accept it. Those numbers are planning estimates. They are not a bid, a permit, an inspection, or a promise that a contractor will match them.
You can use every calculator without an account. Save an image or print a PDF if you want a copy. That does not change the price on the page.
City pages carry a review date. After that date, treat the range as old. A person who has seen the house is the one who can price the actual job.