Any costs directly associated with building the basement apartment, such as separate entrances, kitchen installations, and bathroom fixtures, can be directly allocated to the rental portion. 

Ward, et al. which changes the licensing requirements for parties who are the assignee of a home equity line of credit (“HELOC”).Crux is the state is saying Mortgage Lender License Required for Installment Loans Where Installment Loan is Secured by Residential Property even if you did not originate the loan.

I can tell you right now the cost for sheetrock, labor to install, mud and tape and sand to level 5, prime and 2 coats of paint (7 different colors throughout house), touchups were about the same as what you seem to have been charged. 

Street sweeping And probably a few more I am not thinking about.Dig out and utls are lump sum.foundation lump sum  he pays for the concrete.Framer supplies his own nails fasteners and installs the windows.roofer supply's all materials.insulation supplies all materaislPlumber supplies all materialsElectrician supplies all materialsPainter supplies all materialsFence supplies all materials flat work supplies all materials.counter tops flooring tile work are all one sub they supply all materials and one price. thats off the top of my head. 

The cost for material would be $15-20 on the low end and that would leave only $$25-30 to go to the store buy a door knob come back and install. I

I write down on them what year they were installed so it is easy to determine if we are close to the end of the 10 years.

Flooring can be a basic vinyl or even a DIY job using peel & stick flooring.Expensive materials is more risk for the landlord because when they get damaged there is more likelihood you will lose money on the deal because collecting damages exceeding deposits if difficult.

A strategy you may consider  is selling is using either a 1031 or a structured installment sale to delay taxes. 

Better to start with a PM and learn about how it is done than DIYing it. 

It was recommend by a contractor and he installs this for homes and even in commercial locations such as malls.