It was all done with Romex and proper permits were not pulled.

Sometimes you may need to apply for a moving permit based on the area. 

I am a college student and I work at a hardware store where a large amount of our customers are contractors and landlords.

Don’t have a custom metal staircase made, it will cost more than wood.  

Up til now, I was mainly doing new construction customs and specs. 

Permitting, dumpsters, blueprints, etc are also excluded. 

It's similar to building a house in that there are many factors that can affect the cost when you're building a website, including but not limited to: > Location and experience of your website designer/engineer (someone in a bigger city with more experience is most likely going to charge more)> Fully-custom build vs. website builder like WordPress or Squarespace> Number of website pages needed (not always a factor, but a website with a Home page, About page, and Contact page takes much less time to build than a website with several pages talking about services, policies, etc) > Number of customizations/extra features (even a website builder like WordPress provides a wide range of custom options)Website prices can end up anywhere between hundreds to thousands of dollars depending on who is building it and what you're asking them to build.

Understand your customers. 

I also enjoyed reading "Where Are the Customers' Yachts?".

Collect payments, Subtract Fees, Remit BalanceQuick Books:Class would be the different properties, Customers would be the actual units, and job is the tenant.