I knew they owed me $806 balance after rekeying locks and a maintenance expense was deducted. 

Call around to local locksmiths and ask a few questions about installing a double keyed deadbolt, to see if they are legal or common in your area, just to get an expert suggestions.

I asked her to call a locksmith and have it fixed, take a photo of the bill and I'd take it off their rent. 

Have the owner either bring a locksmith with him or have locks to change all exterior doors as soon as the guy is out. 

I needed to replace a flapper and chain on one toilet, I rekeyed the locks, and I'll need one light bulb.  

But if you do have that set of keys, you could save yourself a locksmith's fees in case if any emergency came up.  

If you aren't handy or don't want to do it, a plumber and an HVAC guy are your two emergency contacts that you really need, followed by a locksmith, pest control, electrician.

Also, go to a locksmith store and purchase the devices that can be installed on windows to lock them without needing to drill into the frame.

If the tenant will not grant access, your state certainly has laws on the books that provide the seller with the ability to post a notice in the door and come with law enforcement ad a locksmith to gain access.

It's about the keys to the home.We get the keys, call a locksmith to change the locks.