How much does a roommate actually save you in NYC?

Everyone in New York knows roommates are cheaper. Nobody agrees on the number, because the usual math compares a citywide average one-bedroom against a citywide average two-bedroom, and those are different apartments in different neighborhoods. So we measured it more narrowly. We took the 214,014 NYC apartments that posted an asking rent between August 2025 and August 2026 across 23 listing sources, matched repeated listings by building address and unit, and then compared one-bedrooms and two-bedrooms inside the same building, in the same calendar month, both limited to one bathroom. That reduces differences caused by neighborhood, building, season, and bathroom count, although it cannot control for every difference between individual apartments.

We could run that comparison in 6,670 building-months across 3,326 buildings, and the median result is a saving of $1,485 per person per month. It cleared $1,000 in 86% of those comparisons, and it went negative, meaning sharing actually lost money, in half a percent of them. These are asking-rent comparisons, not a promise about any particular apartment or household budget.

The mechanism is visible in the whole-apartment rents: the median one-bedroom asked $3,840, the median two-bedroom $4,339, the median three-bedroom $4,500, the median four-bedroom $5,200. A four-bedroom rents for 35% more than a one-bedroom while housing four times the people. New York prices apartments, not occupants, and rent rises far more slowly than headcount. That arithmetic is the entire roommate dividend.

What each roommate is worth

Those are citywide medians, and they show the curve flattening fast. Sharing a three-bedroom instead of a two-bedroom trims another few hundred dollars, not another $1,700; in the same-building version of that comparison, the second roommate is worth a median $481 a month. Past three people you are mostly negotiating over bathrooms, not saving rent.

The skeptic's version: same building, same month

Citywide medians have a known flaw: two-bedrooms cluster in cheaper neighborhoods than one-bedrooms, so a naive subtraction can inflate the saving. That objection is why the headline number of this report comes from the matched comparison instead: one-bedroom and two-bedroom asks from the same building in the same month, both limited to one bathroom so we aren't crediting an extra bath to the roommates, one observation per building-month.

The dividend survives the controls essentially intact: $1,485 matched versus $1,671 naive, with a bootstrap 95% interval of $1,450 to $1,500. It is not a neighborhood-mix illusion. At The Brooklyn Tower on Fleet Street this August, a one-bedroom asked $5,300 while a two-bedroom one floor up asked $7,626, which is $3,813 a head. At 345 Eldert Street in Bushwick in June, one-bedrooms asked $3,345 and one of the two-bedrooms asked $3,345 too. Same rent, half each, and that building is not an outlier so much as the pattern at its cleanest.

The comparison that should worry studio renters is stricter still. In buildings that listed both a studio and a two-bedroom in the same month, half the two-bedroom undercut the studio 96.8% of the time, and the median gap was $923 a month. Downgrading to a studio is the accepted way to afford living alone, but in the same buildings the one-bedroom premium over the studio runs a median $800 a month, so the downgrade recovers only about half of what a roommate does. Living alone is the product New York charges for, at every size.

Where the dividend is biggest, and where it vanishes

One hundred neighborhoods had at least 30 one-bedroom and 30 two-bedroom asks in the 12 months, and the spread across them is enormous. These are straight neighborhood medians rather than the same-building method, so read them as the local going rate for each choice. The 12 biggest gaps:

Morningside Heights tops the table because of a genuine anomaly: the median two-bedroom there asks less than the median one-bedroom outright, $4,599 against $4,750. Around Columbia, one-bedrooms are the scarce prestige product while bigger apartments are priced for the sharers who have always rented them. Greenwood is the other neighborhood where the whole two-bedroom matches the one-bedroom, at $3,450 apiece. Otherwise the top of the table is prime residential Manhattan and brownstone-belt Brooklyn: the neighborhoods people most want to live in are the ones where wanting a room to yourself costs the most extra. In Williamsburg, with 3,576 one-bedroom and 4,409 two-bedroom asks in the sample, the gap is $2,050 a month, which is $24,600 a year for each roommate.

The other end of the table:

The dividend collapses at both ends of the market, for opposite reasons. At the luxury end, a two-bedroom is a different product from a shared one-bedroom: the median Central Park South two-bedroom asks $14,250, so your half recovers almost nothing against a $7,500 one-bedroom, and SoHo works the same way. At the affordable end, in Brownsville or University Heights, rents are low enough that there is simply less rent to split. Roommates are a mid-market instrument. The same reversal hits third roommates in luxury pockets: in Battery Park City, where the median three-bedroom asks $14,437, one roommate saves you $1,201 a month but two save only $383. The second roommate costs each of you $818 a month there.

These are public asking rents, not signed leases, and they assume an equal split with one renter per bedroom. Real households negotiate by bedroom size, and sharing carries costs no listing shows. On the cash side the estimate leans conservative, since utilities, internet, and the couch get split too, and none of that is counted here. The $1,485 is what the listings say privacy costs in New York.