Without this requirement, the requirement of public bidding for performance is only the upper limit, not the lower limit.

The general upper limit is that the bidder's similar performance does not exceed 80% of the total tender amount. For example, for a project with a total amount of10 million, it is reasonable to require 8 million for similar projects, and generally require similar performance of 1-3.

If there are further local regulations, you should refer to the specific regulations.