Qualifications improve your chances; they do not gate the job. Level 3 is the most recognised.
Level 3 most recognisedOpen entry
Your route in
You can start without qualifications - direct entry/volunteering; a qualification improves your chances
1
Qualifications employers recognise (Level 3)
Any of these strengthens your application.
2
Where this can take you
In construction the entry step is CITB SSSTS plus experience; the recognised professional qualification is the NEBOSH National General Certificate (RQF L3), progressing to the NEBOSH Diploma (L6) for manager roles.