In this scene, Walter White goes to Saul's law firm, hoping to get Saul's help on a matter. When he walked into the office, he found that the door was damaged, so he asked Saul's female assistant.
The female assistant told him that it would cost $20,000 to repair the door. Walter was surprised to hear this figure because it was a huge sum of money to him.
At this time, the female assistant explained that the door was designed by a famous designer and the materials used were of high quality, so it would cost so much to repair the door.
This scene shows Walter's surprise and disappointment at the high fees, as well as the luxury and high-level service of Sol Law Firm.