Overall grade: B-
Somerville is much better than most Massachusetts municipalities. It has a modern form-based zoning code, permits triple-deckers and backyard cottages in Neighborhood Residence, allows broader multifamily types in Urban Residence, has reduced parking burdens, and has a serious affordable-housing system. But for a transit-rich, high-demand, four-square-mile city next to Cambridge and Boston, it is still too cautious, too procedural, and too preservation-oriented.
The zoning code’s stated goals are good: walkability, transit-oriented development, mixed-use neighborhoods, a range of housing types and price points, affordable housing, and unbundled parking.
The best part of Somerville zoning is that it does not simply freeze single-family neighborhoods. In Neighborhood Residence, cottages, detached houses, semi-detached houses, duplexes, detached triple-deckers, and backyard cottages are permitted by right. That is real missing-middle zoning.
But Neighborhood Residence is still basically a one-to-three-unit neighborhood conservation district, so much of the city can only evolve slowly.
Urban Residence is stronger. It allows semi-detached triple-deckers, multiplexes, apartment houses, apartment buildings, row houses, and Neighborhood Residence building types by right. The problem is that these higher-capacity districts are not applied broadly enough, and the practical usefulness of the zoning is reduced by lot-size rules, dimensional controls, design rules, affordability requirements, and process.
Permitting is mixed. Many projects are formally by-right, and building permits have a 30-day issuance-or-explanation requirement.
But Site Plan Approval can still require neighborhood meetings, design review, public notice, a hearing, a decision, an appeal period, and certification. Even when approval is likely, this adds cost, delay, and uncertainty.
Inclusionary zoning is substantial. Somerville requires affordable dwelling units in many 4+ unit building types, often at 20%, and the rules are designed to prevent evasion.
That creates real permanently affordable housing. But on small infill projects, a 20% requirement can make marginal projects not pencil unless paired with more height, density, fee waivers, or very fast approvals.
The Affordable Housing Overlay is one of the city’s strongest tools. It gives 100% affordable projects extra flexibility and allows more building types in some residential areas near transit. Somerville should expand this model.
Parking policy is relatively good. The code reduces or eliminates some residential parking requirements, requires unbundling, and restricts parking permits for many newer units in mapped areas.
This is one of Somerville’s most pro-housing, pro-urban choices.
Historic preservation and demolition review are the biggest anti-supply drag.
Local historic district rules regulate visible exterior changes, and demolition review can apply to buildings at least 75 years old that the commission deems significant. In a city as old as Somerville, that captures a huge share of ordinary housing stock.
The rules have timelines and exemptions, but they still add uncertainty and can deter redevelopment.
Condo conversion rules are strong tenant-protection rules, not supply rules.
They require notice, permits, tenant protections, and review for circumvention. They help prevent displacement, but they also make rental-to-ownership transitions and small-building recapitalization harder.
If current policy remains in place, rents and home prices will keep rising over the next 10 years, though unevenly.
Somerville is too desirable, too close to job centers, too walkable, and too land-constrained for affordability to improve without much more housing. I would expect rents to rise faster than inflation in many years, with home prices especially sensitive to interest rates.
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Upzone Neighborhood Residence to allow 4–8 units by right on ordinary lots, and more near transit, squares, corners, and corridors.
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Make conforming housing truly ministerial, with no public hearing or discretionary Site Plan Approval for smaller code-compliant projects.
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Expand MR4/MR5/MR6 zoning around every station, square, and major corridor.
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Recalibrate inclusionary zoning so small projects are not killed by the 20% requirement. Keep strong requirements for large projects and major upzonings.
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Narrow demolition review so ordinary old buildings cannot block net-new housing.
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Streamline condo conversion when no tenant is displaced or when a project creates net new homes.
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Keep pushing on parking: no minimums, broader new-unit permit restrictions, and higher curb-pricing where demand is intense.
Somerville is ahead of many peers, but not ahead enough.
A true A policy would make small multifamily normal everywhere, mid-rise normal near transit, and approvals fast enough that the city’s pro-housing goals actually show up in lower rent pressure.