Not sure why that is exactly, but it is.My electrician once told me that it helps to have all the same brand on the detectors if they're wired.

After initial evaluation of the property, we anticipated replacing the air conditioning, redoing some drywall, paying an electrician to finish some electrical work, replacing the flooring through the whole house and having to pay a plumber to fix some potential leaks in the plumbing due to being abandoned. 

he comes out with a licensed electrician , plumber , hvac , and even a irrigation contractor if necessary . 

I am an electrician.

Do you really want to pay an electrician to reset the gfi, or an appliance repairman to plug in the frig, or a licensed plumber to remove the tidy bowl clip that got stuck in a flapper?

., or have great local contacts that will come in an instant like when a pipe bursts on Superbowl Sunday, and can do efficient background checks by yourself, then worth it to manage yourself; otherwise, management company can actually save you money ... no emergency fees for outside electricians and plumbers, and everything always seems to happen when you're out of town.

(Brother the plumber, sister the electrician etc etc)5) Train chimpanzees for the labor because you do not require workers comp insurance on non humans.EASY AS 1 2 3 This is the best way to optimize your profits in building

I'm looking for a reference for a good electrician to add some boxes to an apartment and to diagnose some other electric issues.

Its a false savings. do you know plumbers and electricians and HVAC people, do you know the landlord tenant laws in your state?? 

That price tag is also a little misleading (not intentionally so)...in my wife's family...who will work for beer and pizza...there are 2 carpenters...a licensed plumber...a licensed electrician... and a building inspector.