This assumes it's $10k worth of rehab, not just materials, and you include labor costs...What investors do is buy the house for deep discount to what it's worth at $80k, add the $10k in repairs and get the appraised value up to $110k. 

The translation must include every term and condition in the lease or rental agreement, but may retain elements such as names, addresses, numerals, dollar amounts and dates in English.

You can only charge what you have been charged, so if you do the work yourself, you can only charge for materials.

Or are you collecting an upfront retainer?

I would probably piggy back some on Peter's idea and cite the lack of basic building knowledge some tenants have,  with interesting examples like....pulling out a dryer to get a lost quarter but disconnecting the vent inside the wall to then vent moist air into the framing causing expensive (thousands) rot repair.putting a tarp on junk (literally) but slanting the tarp angle right into the siding in rainy season (rotting your new siding--but preserving their worn out tires).attachments to clutter, rusty junk, semi-operational cars and illogical desire to retain said junk and debris.I sort of also fall back on the divide between some of the personal management skills of landlords and tenants (realizing it may be why they are tenants, for example). 

I'm curious to what materials YOU use and where do you usually buy them from?

So you retain the ability to exit (if you needed to) rather have finding yourself stuck.  

Feeling good that one day I hope to get out of my dead end job I have a storage unit built into a house that I have all my materials in which I had nothing into.

Carpet shows traffic, stains, and retains dust, pollen and hair, but is dirty cheap.

When it came time to discuss the initial investment it was roughly 7k not including Any marketing material needed.