Do you need to use a licensed electrician/plumber etc.?

[Atul Mathur]

Is a landlord required to use a licensed tradesman when doing work in your unit.   I'm thinking of smaller handyman type jobs like changing a switch, replacing hoses on a washing machine etc.

Is there any potential for liability if something goes wrong and a non licensed person did the work?

[Arlan Potter]

in most localities:

License required for HVAC, Plumbing, Electrical.

In my area I can repace receptacles, lights, plumbing fixtures. No breaker boxes, no HVAC.

I do make repairs to my plumbing - PEX, and fix some drains under the cabinets. 

HVAC and electrical is the most important to use licensed. Can be dangerous if done wrong. Plumbing, not so much, not likely to drown someone.