the design fee is calculated according to the construction area of the project, and there is the charging standard of your design institute. Although there are national charging standards, due to the great competitive pressure of various enterprises in the industry, the fees are often low as a means of competing projects.

your investment of 511 yuan. It's a small project, and if it goes from the scheme to the construction drawing, it will be 1.5 million to 1.3 million at most.