Three questions and you'll have a real range and a timeline. No form to fill in first, no discovery call to sit through, no "prices on application".
What does it need to do?
Roughly how many pages?
Got a logo and photos already?
Usually with two or three questions, because the brief is never quite the whole story.
One number, written down, with what's in it. It doesn't move unless you ask for something new.
You see it going up as we go. Nothing launches until you've clicked around it yourself.