The most successful D class or 100% section 8 project I ever ran into was in Hattisburg MS. the original owner built about 20 little stand alone units  on the property and each was built with cinder block so very minimal sheetrock inside.. concrete floors throughout with drains in the middle ( kind of like you see bathrooms in Asia and other parts of the world . 

Is there a bathroom down there now?

Build a legal rental unit with kitchen, bathroom, new windows and others, according to the design from Sokol Design-Build GroupDig out the basement and install a new concrete slab, it's a separate addition job and will cost $ 15K - $ 20K.much better than the first one (and yes both are insured and are experts in the field) I may have to GC this project myself to save some money. 

Just make sure you're close to a bathroom because you will be in there a bit with all the water intake!

The scope of repairs include: complete renovation of master bathroom, kitchen, and guest bathroom.I spent about $1,700 on materials for the master bathroom (vanity, lighting, tile, grout, 2 medicine cabinets, cement, drywall, etc.).

On the bathroom window that overlooks her window, put some removal glazing on your window (there is a vinyl that you spray water on the window, apply the vinyl and smooth it out-completely removable). 

Hi BP Community,I'm trying to pull quotes for new kitchen remodel and updated bathrooms for 2 BR / 1 BA apartments (~800 SF) in Rhode Island.

Paint, floors, new kitchen, and bathroom updates.

This Mountain Modern condominium has high-end finishes in kitchen and bathrooms including heated floors and custom built-ins in the living room.

Hi BP community of San Diego, I am looking to renovate a small (and only) ~45 sq ft bathroom and some minor kitchen work in our soon to be first rental!