Code compliance.

@HU-867564120 but you can still get permits and be up to code to finished basements with a lower ceiling height, so I guess my question is, what is "habitable" space? Is it meant for sleeping?

@kandrewspa so habitable means "sleeping quarters"? Houses with finished basements are listed as finished on the MLS whenever I see them (though they don't add to total sq ff), so is that min height if you plan on adding a bedroom? It's confusing to me because anything below grade isn't counted regardless, at least during appraisal. I get the egress window needed from a fire/occupancy certificate end of it, but how is ceiling height part of it. I'm about to finish our basement, it's 2 inches short of being 7 feet so we're wondering if it's a waste of money to have it all finished.

Ceiling height matters for tall people. When we moved to England, my husband found a historic house to rent. Mary Shelley had written Frankenstein in the house. He was sure I'd love it. When he went to see it, it turned out the ceilings were low, the door frames lower than the top of his head. He's 6'4" barefoot. He has taller cousins. Anyway, having to duck to walk through a doorway was not something he'd put up with. We did not rent that house.

Definition of "habitable" from 2020 NYS Residential Building Code, which I believe is taken verbatim from IRC:

Spaces less than 7' are not comfortable to use for other than brief periods, storage, etc. It would feel like you're in a cave. Likewise, in some jurisdictions, upstairs square footage doesn't count unkess its taller than 7'..

@latifolia @Seabornman this is a 120-year-old home in a historic neighborhood. Low ceiling basements are normal here and expected to be finished. I guess my question is, what does that 7' requirement mean in practical terms if I'm about to finish the space? Is the building dept coming to have it ripped out when we sell? They don't count towards total square footage regardless of the ceiling height, so if I'm not putting a bedroom in there, what's the difference? We're also talking 2 inches difference here.

The up side of finishing a low ceilinged space would be a useable room with lower property taxes on that space.

@ulisdone oh so is habitable space for tax assessments by way of pulling permits? I was told if you finish the ceiling of the basement a tax assessor will consider it finished. Lol this is so confusing

The building codes are full of exceptions and clarifications. Your architect can help you find the right ones. Here is a clarification regarding ceiling heights in existing residential basements:

@Seabornman ahhh thank you, this may explain why there are low ceiling finished basements in our area

Older homes may have low ceiling basements "grandfathered" in. Check with the authority having jurisdiction in your community to be sure.

Separate egress is usually required too. Even if there is no bedroom in the basement, I would not use a basement that didn't have that lifesaving precaution. Just think of the 38 people who drowned in NY and NJ basement apartments last September.

For the dozen or so years I was a real estate agent, I used to see such tragedies in waiting all the time.

@worthy thank you, I just called the building department and they said they don't look at ceiling height of finished basements of existing homes.