Say 220 was roofing ststems for expenses, 221 could be felt, 222, shingles, 223, hardware (nails, screws, trim, drip trim, vents, sofit) 224, decking/lumber, 225, roll roofing (including rubber systems) 226, glue/adhesives...you get the idea.If you are knocking out say 4 basic floor plans, different elevation but all the same materials/grades, you are buying bulk and allocating costs based on the plans per plan.

In spite of all the differences of opinion we may have in how we are governing or being governed, I think our forefathers hit the nail on the head.

Buy the right property in the right location, with the right up front repairs, and you are 85% there ... screen your tenants well and you are another 10% there on top of that ... there's always going to be that ~5% that you just can't get rid of and will need to put in a bit of work from time to time on, but it is well worth the effort so long as you nail the other 95% ... if you don't nail that first 85%, though, then you are going to have some hard work ahead of you, with or without a PM.

@Matt Shields nailed it!

I am far from one to push higher education but for a young person without access to a large amount of cash or contacts, a degree in business, engineering or architecture adds to your knowledge base and gives you a bit of credence and polish when you are lacking in other areas. 

It comes in a small jar with a brush like nail polish. 

@Jd Martin hit the nail on the head.  

@Scott Skinger hit the nail on the head @Uwais Zaid.

.- bathroom sink ceramic paint are coming off- they want the garage door light to stay on after it opens up- pen marks on the bathroom vanities- light bulb needs to be replaced- nails on the wall

One thing you can do with the sensors is stick them onto a small, thin piece of whatever you have on hand and then use a finish nail to then attach that to the door/trim/etc.