Unlicensed building and/or pest inspectors can legally operate under a company and their QBCC licence without having any experience, qualifications also insurance. Do a license search through the QBCC and make sure your building or pest inspector personally carries indemnity insurance, not just the company! QBCC License search
Most definitely! To a limited degree only. Take your time and look for items that you may believe to be costly to have repaired or replaced before engaging a qualified building and pest control firm.
Not a good idea! Homebuilders are not experienced in identifying faults related to commercial buildings. Their insurer may also not cover them in case of a claim of negligence or omissions. Employ experts in the particular field to carry out inspections and make sure they have insurance!
Not unless they are an experienced and qualified building inspector and carry insurance or are willing to personally accept responsibility for any of their oversights. Before hiring a building inspector, I recommend asking about their insurance policy.
Hold a current QBCC domestic builders license or open license if carrying out commercial building inspections. Have at least 5 years as a builder. Carry current indemnity insurance. Have a completed residential building inspection license. I strongly urge you to perform a QBCC license search when choosing a building inspector.