Cambridge vs Somerville: The Gap Is Smaller Than You Were Told

Almost every researcher, postdoc, or engineer who calls me about Cambridge has already been given the same advice by someone: “Cambridge is expensive — look at Somerville.”

It is reasonable advice. It is also several years out of date.

The numbers first

Zillow Home Value Index, as of July 2026.

	Cambridge	Somerville
Typical home value	about $1,056,000	about $940,000
Year over year	−1.1%	+0.4%
Five years	+8.4%	+9.4%

First, what this number is. ZHVI is not the median of homes that actually sold. It is Zillow’s modelled estimate of what a typical home in the mid-range of the market is worth, and it pools single-family houses and condos together. “Cambridge is $1,056,000” does not mean homes there sell at that price; it means the typical Cambridge home is estimated to be worth roughly that. Individual listings vary enormously in both directions.

With that said, two things stand out.

The gap is about 12%. Not 30, not 40. If you were budgeting for Somerville because Cambridge felt out of reach, the difference may be smaller than the one you were planning around.

Over five years the two moved almost the same amount — 8.4% and 9.4%. Somerville did not outrun Cambridge, and it did not lag it. Whatever repricing people expected has largely already been absorbed into both.

Why Somerville caught up

The single clearest reason is transit.

The Green Line Extension opened to Union Square in March 2022, and the Medford branch — East Somerville, Gilman Square, Magoun Square, Ball Square, Medford/Tufts — in December 2022. Neighborhoods that were a bus ride from the subway became a walk from it.

Somerville already had Davis Square on the Red Line and Assembly on the Orange Line. What the extension did was fill in the middle of the city, the part that used to be described as “great, but you’ll need the bus.”

The buyer’s takeaway is not “get in before it rises.” That framing is several years late. The extension is open, running, and priced in. What you are buying now is the finished condition, not the anticipation of it.

What the price gap actually buys

Two similar numbers do not mean two similar cities.

Housing stock. Somerville is one of the densest cities in New England, and its defining building is the triple-decker — three-family houses, a great many of them now converted into condominiums. If you are buying in Somerville you are, more often than not, buying a floor of a converted house. Cambridge has a wider range: Victorians, mid-century houses, older brick condo buildings, and newer construction near Kendall and Alewife.

That matters for a practical reason. A condo in a three-unit converted house is a different ownership experience from a condo in a hundred-unit building — a smaller association, less professional management, and a roof replacement that is split three ways instead of a hundred. Neither is worse. They are different, and the difference shows up in the condo documents.

Distance to work. For anyone tied to Kendall Square, Harvard, or Longwood, the commute difference is real and worth measuring on a weekday morning rather than on a map.

Character. Cambridge is older money and institutional gravity. Somerville is younger, denser, and has changed faster in the last decade than almost anywhere else in the region. People rarely regret the price; they occasionally regret the fit.

The school question, which is usually asked wrong

Korean families almost always ask me the same thing: “If I buy this house, which school does my child go to?”

In both of these cities, that question does not have an address-based answer.

Cambridge assigns students through a district-wide controlled-choice lottery. Its own registration page is explicit: a kindergarten placement is guaranteed, but assignment to one of your three chosen schools is not. Buying a house across the street from a particular school does not entitle you to that school.

Somerville also runs a controlled-choice system — families rank preferences, and factors including siblings and proximity to the school carry weight in the lottery.

So the honest summary is: in Cambridge, your address does not decide the school; in Somerville, your address counts for something but does not decide it either.

Policies and capacity change year to year. If a school is genuinely driving your decision, call the district’s enrollment office and confirm this year’s rules before you write an offer. I will not tell you a house comes with a school, because in these two cities it does not.

Which one, then

Cambridge if you are institutionally anchored — a lab, a hospital, a company you expect to stay with — and you want the shortest possible commute and the widest range of housing types.

Somerville if the roughly 12% matters to your budget, you are comfortable in a converted multi-family, and you want a city that is denser and livelier at street level.

Neither, if you are buying on the assumption that one is about to outperform the other. The five-year figures do not support that story, and index history is not a forecast in any case.

For a comparison built around school districts rather than transit, Newton vs Brookline covers that pair. The Cambridge neighborhood guide has more on the area itself.

One caveat

These figures describe two cities in one month. They are not a valuation of any home you are considering, and they are not a forecast.

What I do is walk both cities with you, in Korean as well as English, and be specific about what each price actually gets you. Get in touch and we can start by narrowing it to one.