Neither of us like asking for money (kind of a pride thing I guess) but that is the main thing missing from our business plan at this point.  

I have a small network of cash or approved financing in hand who are mainly looking for sfh's or mfh's. 

Like flying over to Catalina is super cool and mixing it up with atc flying through the LA basin .. brings back your radio skills  that we sometimes lose when I am mainly flying rural NW.. and not talking to anyone..  

Then they’ll knock on another .25-.325 for it being a duplex.You’re finding two main reasons why multifamily isn’t always superior.

My main question is: Can I only charge them for a repair or a replacement countertop?

I would think the two main things to worry about would be building inspector and the inspections when you get ready to sell. 

So my main reason behind this post or “question” is.

I am a welder by trade, and I have a small side business of repairs and fabrication to add to my main income.

Looks like you're casting a pretty wide net; where are you mainly based out of?

Profit margin, proximity to home, and the fact that it was mainly just cosmetic renovation.