Now if you pay your contractor , and he doesnt pay the electrician , the electrician will file a lien against your property .

Or it takes a month to get an reputable electrician to show up to fix four outlets.It is nearly impossible to find 70% of ARV minus construction costs.

As a commercial electrician I know that the flipper should have pulled a permit.

I believe there was a salve of some sort that was supposed to be put on the aluminum to copper junction.Wall switches and outlets designed for aluminum wiring will be stamped CO/ALR.I'm not an electrician, just posting up some of what I remember from back when I had a home with aluminum wiring.Edit to add: Based on what Charles posted, I'll add that I believe the main feed to our house was copper, then aluminum was used to wire the house.

I have good plumber for $10 an hour, and a retired electrician at $15 an hour.

I had an electrician once listen when I described about installing the lighting and he described a different way to do it and why it would be better.

However if the business he is running is something that is not typical to be paid in cash like they are an electrician, other tradesman, some other type of small business where they should be paying taxes....then I would not.  

Otherwise, have them report damages to you and call the local plumber, electrician, etc. yourself.

If you look at all the contractors, plumbers, electricians, etc they all have the utility vans and I believe having everything covered and heated ( in the winter) goes a long way.

Now there may be some over lapping of trades and that's where having more then one electrician or plumber or carpenter ect come into play.