Hi DebbiE.
I assume that this expansion project of the existing site has been managed by means of a project management approach, including an evaluation of the risks associated to this change ( for example, how you assured business continuity to your customers during the works) : so you should have already highlighted the critical point and significative changes. This is mirrored in the fact that you said that processes and procedures did not change as well
Not be aware of the type of the particulars, I overall agree with what you reported about training, competence , infrastructure and work environment.
In case of new resources for this expansion , I would check the clause related to outsourced resources, in the case you used external resource in this expansion and additionally in the production where new employees are foreseen, as you reported.
Besides, you should communicate to your registrar this kind of change , that is significative given that the site enlarged for space and new employes, even though processes and products remained the same.
Hope this helps