Certification is required
Incidentally, the BSL levels are not just national, they are almost the same internationally, as they have been developed by international committees for disease control. The only difference between countries is generally the certification process and if you have a private or public certification body, but not what it requires.
BSL laboratories almost always need certification from some institution that checks that they actually follow the regulations before starting work. Pubmed has articles about common issues and the certification process in India. Biomedical Science Letters describes the BSL2 Audit process and requirements for a Singaporean lab.
Universities typically already have the lab certifications and strict rundowns on how to get into those. A typical rundown of how to access to a BSL-2 lab can be found in the Rochester University guidelines, which is located in New York. Carnagie Mellon University in Pennsylvania has similar rules. The university of Wisconsin/Milwaukee offers the guidelines for BSL2 as well.
Certification is not just for the lab... but for each item in it!
The CDC also has a whole book on the matter. 2009 saw the 5th edition, 2020 the 6th. These books also contain specific certification requirements to keep the overall BSL level certification for the lab. For example, a random item I picked is the "Biological Safety Cabinet".
D. Laboratory Facilities (Secondary Barriers)
- BSCs and other primary containment barrier systems are installed and
operated in a manner to ensure their effectiveness. See Appendix A.
c. BSCs are certified at least annually to ensure correct performance,
or as specified in Appendix A, Part 7.
The evolution of containment equipment for varied research and diagnostic
applications created the need for consistency in construction and performance.
Federal Standard 20929 was developed to establish classes of air cleanliness and
methods for monitoring clean workstations and cleanrooms where HEPA filters
are used to control airborne particulates. It has since been replaced with ISO
14644-2015
So the BSC has to comply with this standard - and as you notice, the standard costs a couple hundred swiss francs and is only to get the specifications of the one item. Yes, lab certification is expensive, as you need to certify a lot of items to get the overall safety certification from the relevant certification agency.