When leasing a building / residential property, landlords often want to do repair work themselves. Will they then be regarded as a contractor coming in and doing some work? Going through the same process of pre-qualification, vetting, training and induction as everyone else?
WorkSafe has a set of FAQs for Commercial Landlords on thier website.
In summary they are a PCBU and have duties to consult, co-operate, and coordinate with you as another PCBU with overlapping duties - I doubt that you would need to treat them as a contractor depending on how much control and influence you have over thier work.
In a slightly related vein; City Councils have been known to offer reduced rates on residential property where they expect home owners/occupiers to keep the road-side lawns cut short. Are they, the council, employing the resident in a lawn-mowing capacity? It appears so if the reduced rate fee is a financial recompensation for work done on council-owned property. Should those councils then be liable to provide PPE to the resident and to train them in its use and enforce the use of the PPE?