The cost to have someone or a mechanic install a trailer brake controller ranges from $75.00 to $200.00 for labor and then the cost of the parts.
The actual cost to install a trailer brake controller for your electric trailer brakes depends on the place that's doing it and how much work needs done.
I paid a local mechanic $100.00 in labor to install my electric trailer brake controller on my truck.
I got quotes from a dealer for $500.00 but went to a local mechanic who installed it for me for $100.00 in labor charges.
it took the local mechanic around 1 hour to install the electric trailer brake controller and he did a great job.
You can also install the electric trailer brake controller yourself if you're mechanically inclined but the instructions on the trailer brake controller I bought confused me and I did not want to mess it up so I paid the money to have it installed instead.