If done in your yard, charge "rent" for the space.

@Ben Ballinger I think that first you need to evaluate if it's even possible. as @Deanna McCormick pointed out, Washers/Dryers in the units require special hookups (electricity, plumbing, venting, sometimes gas) this could cost you a lot of money to create these or to maintain them if the property is not setup for this.Personally, I like the in-unit because it allows you to charge rent for the machines and it frees up your basement to generate more income by creating another unit or rentable storage units or you could create a shared space that will increase the attractiveness of your units (maybe a library, a game room, fitness room etc

Or are some landlords just cheap and opt to go with battery smoke detectors notwithstanding the law? 

Our inspection uncovered that the smoke detectors were battery powered.

doors - if outside doors=350 a door or inside doors=125 (or the cheapie 35) per door no labor.washer/dryer - just the electric cables 20 each no laborkitchen outlets - just GFI is 20 each. no laborpaint/knobs - 1.50 each knob. no laborfaucet - decent one 80-150. no laborplastic lining - no ideadetectors - either batteries or new detector at 10 to 49 eachgarage door - 1 hour labor cost for Atlantaoutside cleaning - 300 to 500 for cleaning.Do not misunderstand me, you can get the job done by yourself cheaper, but hiring two guys and the cost of materials is surprise.

The one I'm planning to use chargers a full months rent.

Why shouldn't I be able to pay a PM based on the work done on the property rather than based on a percentage of what I am able to charge rent?

I had a 2012 Jeep Grand Cherokee with 20k miles, that I purchased 2 years ago with financing after selling my dodge charger in order to save cashflow to fund my Roth and my sons college fund (got a rate of 2.5% so it was a no brainer).

And batteries, last for 1 year, 5 years?...

Obviously, it's reasonable for you to 'mitigate damages' by starting to look for a new tenant after the on-lease tenant has given notice and vacated, and you cannot charge rent after the unit has been re-rented.