Why Greater Boston's housing shortage is keeping two generations from moving

Picture a hypothetical street in Melrose. A longtime homeowner lives in the three-bedroom house where they raised a family. They know the neighbors, the shops and the route to the doctor. The stairs are getting less appealing, but the smaller, easier-to-maintain home they would consider buying nearby is expensive or unavailable.

A younger household wants to move into that same neighborhood, perhaps for a second bedroom, a yard or a shorter trip to family. The houses that fit rarely come onto the market at a price they can manage.

Neither household is doing anything wrong. Both are short on choices. And that helps explain one of Massachusetts' most startling housing statistics.

A quarter-million larger homes, and an important distinction

The state's housing-needs assessment (opens in a new tab) estimates that 250,000 Massachusetts homes with at least three bedrooms are headed by someone over 70. These are existing, occupied homes across the state, not vacant houses in Greater Boston, and the figure does not tell us whether their residents want to move.

There is another striking number: of approximately 1.6 million homes statewide with three or more bedrooms, more than 215,000, or about 14%, are occupied by just one person, regardless of that person's age. That's not evidence of waste. It is evidence that bedroom count and household size often do not match.

One Boston-region study summarized by the state offers an especially revealing comparison: 52% of larger homes built since 2000 house families with children, versus 38% of larger homes built before 2000. Older housing and newer housing are serving families differently, though the figures do not establish why any specific owner stayed.

It's tempting to picture a supply of large houses waiting to be released to younger families. But homes are not a public inventory to be reassigned. A resident may want to age in place. An adult child might be living there. A family may need a spare room for care or visitors. And having a valuable house does not necessarily mean having the monthly income to afford a move.

Why a valuable house isn't always a reason to sell

Selling a paid-off house might produce substantial proceeds, but an older owner would then need somewhere else to live. A smaller condo could come with a sizable purchase price, monthly condo fees, property taxes, transaction costs and unfamiliar maintenance rules. Moving away from familiar doctors, friends and family has a cost that cannot be reduced to dollars.

The state's February 2026 senior-housing commission report describes this problem from the other side of the housing market. It says the median income of Massachusetts households headed by someone older than 65 is about $69,000, roughly half the median for households headed by people ages 45 to 64. That figure describes income, not savings or home equity. Some older homeowners are wealthy; others are housing-rich but cash-constrained, while many older renters have little wealth at all. The commission (opens in a new tab) argues for more affordable, accessible ways to remain in one's community, whether in the same home or a different one.

Think about the choices available in a suburb where most listings are detached houses and few are smaller, step-free homes near a town center. The homeowner who wants fewer stairs might have to leave town to find one. Staying put may be the most sensible decision, even if an extra bedroom is unused.

This is why the housing shortage is not a simple dispute between older and younger residents. Building a desirable smaller home can give an older resident a choice and create an opening in an existing larger home. Moving from one already-occupied home to another does not, by itself, increase the number of homes in the region. Constructing a new home does.

What the next decade looks like

The demographic pressure goes beyond today's homeowners. Massachusetts' Greater Boston housing forecast (opens in a new tab) expects about 64,000 more households headed by people 70 or older from 2025 to 2035, as the Baby Boom generation ages. It also projects about 63,000 more headed by people ages 35 to 55, as Millennials move through their family-forming years. Households headed by people ages 55 to 69 are expected to fall by roughly 36,000, partly because a smaller generation follows the Boomers into that age range. Other ages make up the balance.

Put those shifts beside the broader forecast: Greater Boston's population is projected to rise only 2.3%, or around 78,000 people, yet the number of households could rise by 93,300. People living on their own, smaller families and households that could not previously form still require homes. The state adds approximately 28,000 homes to improve the number available for sale or rent, bringing its rounded forecast to 121,000 additional homes across the region over ten years.

And these are not necessarily households shopping for luxury condos. The state estimates that 42% of net additional households will have incomes below $35,000 annually and another 28% will have incomes from $35,000 to $75,000. The mix includes older people living alone and families. The percentages describe projected net household growth, not today's buyers or the income of every future tenant. New homes have to work at different price points to help these households directly.

One practical answer is already being tested in local neighborhoods

The state has begun removing one barrier to building smaller homes. Under its 2025 accessory dwelling unit (ADU) rules, many owners outside Boston can add a small, separate home on a qualifying property without a discretionary zoning special permit, while still meeting building and other applicable requirements. Boston has its own zoning framework.

In an August 12, 2026 report (opens in a new tab), Massachusetts counted 2,084 approved ADUs statewide since the start of 2025, including 50 in Somerville. That is a count of approvals, not completed or occupied apartments. On October 15 (opens in a new tab), the state announced another $5 million to support ADUs, including a new community pilot. Those funding and regulatory steps do not establish how many extra homes residents can move into this winter.

An ADU could let an adult child live nearby or provide a smaller place for an older relative. But construction is expensive, not every property qualifies, and a backyard unit isn't appropriate for every resident's mobility needs. The region also needs accessible apartments, modest condos, rentals near shops and transit, and homes large enough for growing families.

A better question to ask at the next housing meeting

Rather than ask only how many new units a proposal adds, ask who can move into them, and who might then be able to move elsewhere. A walkable, step-free two-bedroom may help an older homeowner stay close to family. A reasonably priced starter condo could let roommates form separate households. A three-bedroom rental might give parents with children room to breathe.

For readers following a development in their town, three details deserve attention: whether the plan offers a genuine mix of unit sizes and prices; whether homes are accessible and near existing services; and whether the advertised homes are merely proposed, approved, under construction or actually ready to occupy.

Massachusetts' 2026 housing-production update (opens in a new tab) recorded more than 19,000 net additional residential addresses in Greater Boston during 2025. That was progress, although the address data cannot say whether those homes are affordable, accessible or occupied, and its annual timing is imperfect. One strong year also cannot answer whether a town is creating the right homes.

A longtime owner should be free to stay in a home they love. A younger family should have a realistic chance to settle nearby. The opportunity is not to pressure one generation to make room for another, but to build enough appealing choices that moving becomes possible for both.

Have a question about housing choices in your Greater Boston community? Write to hello@bostondwelling.com. We may explore it in a future article.