Most of Somerville's rental stock is not apartment buildings. It is three-family houses, or triple-deckers, and renting a floor of one works differently from renting a unit in a building with a management company. Somerville also repealed its rule against more than four unrelated people sharing a house, which changes what a roommate group can legally do here.
What actually changes when your building is a house
The apartment itself may look much like any other. What is different is everything around it.
In a managed building, someone is paid to handle the shared parts: snow, trash, the entry, and a maintenance request that goes into a system. In a three-family house there is usually no one on payroll for any of it. There are three households and an owner, and the work is divided between them, sometimes formally in the lease and sometimes by whoever gets to it first.
More of the building is your problem, and the arrangement is often informal. Three things follow from that — how many people can live there, who handles what outside your door, and what it means that your landlord is a person rather than a company.
How many people can share it
Somerville no longer caps a triple-decker household at four unrelated people, but that does not mean occupancy is unlimited.
According to the Massachusetts Municipal Association, Somerville's City Council in November 2023 repealed the rule prohibiting more than four unrelated people from living in the same house without a permit.
It came in the same zoning package that allowed three-unit buildings to be built as of right anywhere in the city, adopted to comply with the MBTA Communities Act.
This does not override your lease, the number of legal bedrooms, or state sanitary code requirements on space per occupant. A landlord can still cap occupancy in the lease.
Check current zoning with the City of Somerville before relying on this for a specific household. The MMA is a municipal trade association reporting on the vote, not the ordinance itself.
A 2019 ordinance had already re-legalized three-unit construction, but only adjacent to existing three-unit buildings and only with one unit kept affordable. City Councillor Matthew McLaughlin described those limits as too stringent, and the MMA reports they failed to produce new housing. The November 2023 vote removed them.
For a five-person household looking at a floor of a three-family, the city-level barrier is gone. The lease and the physical unit are now the constraints.
What's yours and what's the owner's
Outside your door, responsibilities split in ways that a managed building never makes you think about.
| Responsibility | Who it falls to | What to check before signing |
|---|---|---|
| Shoveling the sidewalk | The property owner, under the city ordinance | Whether the lease tries to assign it to you anyway |
| Snow on shared stairs and porches | Usually negotiated between households | Ask who did it last winter |
| Trash and recycling to the curb | Almost always the tenants | Which day, and whether barrels are provided |
| Common entry and stairwell cleaning | Usually the tenants, informally | Whether anyone actually does it |
| Repairs inside your unit | The owner | How you report them, and how fast they respond |
| Driveway and off-street parking | Assigned by the owner, often informally | Get it in writing, not a verbal "you can use the spot" |
Snow, and where the duty legally sits
The City of Somerville states that all property owners are responsible for removing ice and snow from sidewalks and accessible ramps abutting their property, and that this applies to residents and businesses alike.
Sidewalks must be cleared within six daylight hours after snow stops, shoveled down to pavement at least 36 inches wide. For one- to three-unit houses the fines run $100 for a first offense, $200 for a second, and $300 after that.
The point is that the ordinance puts this on the owner while triple-decker leases frequently assign it to tenants. Those two facts coexist. Whether a particular clause is enforceable depends on the clause and your situation, so this article won't tell you — it will tell you to read that clause before signing, knowing what the city rule says. Our guide to reading a Boston apartment lease covers the rest of it.
Trash, and the rules that come with it
In a three-family, taking the trash out is yours, and Somerville has specific rules about how.
Trash must be kept in waterproof, covered barrels during the week. It goes out no earlier than 4 p.m. the day before collection and no later than 7 a.m. on collection day, and barrels come back in by 7 p.m. that evening. Moving boxes need to be flattened or broken into roughly three-foot pieces for recycling, which matters more than it sounds like during a September move.
Ask during the tour whether barrels come with the unit or whether you are buying them.
Renting from a person, not a company
Small landlords are the norm in Somerville's three-family stock, and some live in the building.
That shapes how fast repairs happen, how formal the application is, and how much room you have on rent. Decisions come from one person rather than a policy, and individual owners vary far more than management companies do. We cover what dealing with a single owner means for the rent itself in negotiating rent with a small Somerville landlord.
If the owner lives in the building, that arrangement has its own dynamics — we cover them in renting a room from a live-in landlord.
Which floor you're on
The floor matters, and it is a real decision: stairs, heat distribution, porch access, proximity to the basement and to the street. It is also mostly a noise question, and noise deserves more room than this article can give it. We cover floor choice properly in how to find a quiet apartment in Boston.
What this article deliberately doesn't cover
Building condition. Three-families in Somerville are old, and old buildings need checking: heating, electrical, windows, structural signs, pests. That is a full checklist rather than a paragraph, and we have written it as what to check before renting an older Boston apartment. Read it alongside this one.
Are more of these being built?
Yes, and that is a change from the recent past.
Since November 2023 a three-unit building can be built as of right anywhere in Somerville — not only traditional triple-deckers, but any three-unit structure. The same package dropped special-permit requirements for steep slopes. The MMA reports the changes were adopted to comply with the MBTA Communities Act, which required rapid-transit communities to adopt multifamily zoning by the end of 2023.
For a renter this is a supply story on a construction timeline, not a leasing one. But the three-family form Somerville is built from is legal to build again, which had not been true for most of a century.
Where new units land relative to transit is covered in living near the Green Line Extension, and what Somerville costs and how the squares differ is in our Somerville renter's guide.
Frequently asked questions
How many roommates can you have in Somerville?
The city repealed its rule against more than four unrelated people sharing a house in November 2023, per the Massachusetts Municipal Association. Your lease, the number of legal bedrooms and state sanitary code still apply, so confirm current zoning with the city for a specific household.
What is a triple-decker?
A free-standing wood-frame house containing three stacked apartments, one per floor. It is the characteristic building type across much of Somerville's rental stock.
Who is responsible for shoveling at a Somerville rental?
The City of Somerville puts the duty on the property owner. Leases sometimes assign it to tenants anyway, so read that clause before signing.
What are the shoveling deadlines and fines?
Sidewalks must be cleared within six daylight hours after snow stops, at least 36 inches wide, down to pavement. Fines for one- to three-unit houses are $100, then $200, then $300.
Who takes the trash out in a three-family house?
Almost always the tenants. Somerville requires waterproof covered barrels, put out no earlier than 4 p.m. the day before collection and no later than 7 a.m. on the day, and brought in by 7 p.m.
Is renting from a small landlord better or worse?
It is different rather than better or worse. Fewer layers between you and the decision-maker, less formal process, and far more variation between individual owners than you get with a management company.
Are triple-deckers still being built in Somerville?
Three-unit buildings have been allowed as of right citywide since the November 2023 zoning update. New supply arrives on a construction timeline, so the effect on available rentals is gradual.
Which floor of a triple-decker is best?
It depends mostly on noise tolerance, stairs and heat. We cover the floor decision in detail in our guide to finding a quiet apartment.
Sources, and when this was current
Written August 2026.
The November 2023 zoning package, the repeal of the four-unrelated-occupants rule, the 2019 predecessor ordinance, the McLaughlin quote and the MBTA Communities Act context are from the Massachusetts Municipal Association's report on the vote, read August 12, 2026. The MMA is a municipal trade association reporting on a council vote, not the ordinance text — confirm current zoning with the City of Somerville before relying on it for a specific household.
Shoveling responsibility, the six-daylight-hour deadline, the 36-inch width and the fine schedule are from the City of Somerville's snow information page. Trash and recycling rules are from the City's Moving to Somerville: A New Resident's Guide. Both were read August 12, 2026.
Ordinances and zoning change. Check the City of Somerville for the current position before making a decision that depends on it.
This article is informational and isn't legal advice.