If you’re conducting a bi-annual inspection, most landlords change filters, smoke detector batteries, and conduct a general inspection of the overall quality of the property. When inspecting an occupied property, you can check for the following:
Water leaks (sink, toilet, faucet, roof)
Water damage (walls, ceiling, floor)
Overall cleanliness/condition of property
Treat property inspections as preventative care. Even if there are clauses in the lease that indicate tenants are responsible for tasks such as changing filters, some landlords find it’s better to simply do the job themselves. This way, they can ensure that it is done and that they are aware of the condition of their property.
Source: MaintainX (Community Member)