Typically you would need a variance allowing the new structure to be built. but that may be tough since it is New Construction. You may be better of converting your single family into a 3 family through a renovation loan. The best source to anser your questions is the local building department. They can direct you in the best way to proceed. Good Luck.... more
Any 3 family building could be rented to tenents with govt programes. Yes a fixer upper building could be re-done & get inspected with the city, to be rented to govt-approved programe tenents.
(let me know as i could get tenents with approved programes & the owner gets 4 months rent in advance)... more
The cost of an additional 1/2 bath would be dependent upon where the plumbing needs to be run, where your waste line is, etc. You must get contractor estimates for this.
A certificate of occupancy will be necessary from your town, along with a building permit. Although you are not changing the footprint of the house, there will be an impact on your taxes. The tax assessor's office should have a formula for your area for a 2-piece bathroom.... more