A commercial fitout requires a commercial fitout builder
who has the experience and know how of running an internal fit out project. Domestic builders generally do not know (even if they claim they do) how to build metal stud walls (the partition systems used in offices), nor do they have the knowledge about the essential services
(fire, electrical, mechancial) and finalising requirements for a building permit. To get the job done right, you are best to engage a commercial builder with experience in doing similar fit out works.