That’s one thing I’m looking at, adding a bedroom and possibly a bath to the basement.
Two identical models/footprints I looked at:
A - 2 beds 1 bath. Hot water baseboard heat (gas boiler). Bath is upgraded but dated (prob in 90’s), kitchen is updated probably mid 2000’s. Basement is full height, has a front room that could easily be turned into a bedroom. Basement would need a dig out/pump for a bathroom install. Rooftop deck with interior stairs, plenty of room to add a 2nd bath upstairs (master bath) and maybe even move the washer/dryer upstairs. Parking pad. No central air. $265k
B - Same footprint/style as A. But already 3 bed 3 bath. I don’t like how they laid out the upstairs baths. I don’t like how they installed the central air ducts. No room now for an interior stairwell for a rooftop deck, and currently no rooftop deck. Hot water radiator, oil fired boiler looks original to the house (1915-ish). The bedrooms are all the same size. The basement bath is not a dugout/pit, the toilet has a mascerator and the tub is raised (at 5’9” my head hit the ceiling in the tub), so I’d like to change that. It does have a parking pad, also. $285k
Option A I could get 1 roommate and wind up paying less than I am currently in rent. Add a bath to the basement and finish off the bedroom. Move the tenant into the basement/bath while I update the upstairs with a master bath and laundry. Also add central air (most likely a Mini split system). Then get a 2nd roommate and my mortgage would be covered.
Option B - I could conceivably get 2 roommates immediately. Slight inconvenience to the basement tenant while upgrading the basement bath. Needs boiler conversion to gas boiler (house already has gas for stove and water heater). But I really don’t like the layout of the baths upstairs and also how they tan the ducting for the central air. Very inefficient use of the space upstairs (space that is currently open in Option A).