My room which is 25 X 15 X 8 cost abour 1,100 US to build. Everything was done be my father and I. There are 6 recessed lights, 15! electrical outlets, wiring for a ceiling fan/light, carpet, baseboard, and a framed window.
The room was bare to begin with, cinderblock walls and cement floor. The electrical wiring was very easy and is something you should do yourself and save lots of money. And painting is ridicously easy when there is nothing in the room but a bare floor and walls that need to be painted.
Here are things you should do:
Paint walls and floor with waterproof sealant
Rent a thing to lift drywall so it is easy to put on the ceiling (not sure what they are called)
figure out how you are going to secure the framing to the cement floor (we used things that were practically train spikes)
I would think your size room would be about 1,800 dollars if you did everything yourself which is a very rewarding experience. Good Luck.
Just noticed we both live in Maryland. If you want to pay me I will be glad to work
