2026 Massachusetts Ballot Question #7: Minimum Lot Size

By Mike DelRose Jr. | DelRose McShane Team | Coldwell Banker Realty

Zoning is the least understood item on the November ballot. It is also one of the most important. Most of what is written about it covers Massachusetts as a whole. That is no help here, so we pulled the zoning tables for Belmont and Watertown and worked out what this would do to each one.

How you vote is your business. Our job here is to put the numbers in front of you, give both sides a fair hearing, and spell out what each outcome would mean on your street.

What would Question 7 actually change?

Today every city and town sets its own minimum lot size. That is the smallest piece of land a house may sit on. Across the state, those minimums are often large.

Question 7 would add one paragraph to the state Zoning Act. In any district that allows homes, a town could not block a single-family home or require a special permit for one. The lot would have to meet three tests. It needs 5,000 square feet of land. It needs 50 feet of frontage on a street or public way. And it needs access to public sewer and water.

Everything else stays local. Setbacks, building height, lot coverage, parking, and short-term rental rules all stay with the town. The state housing office could issue guidance on how the law works.

The measure does not build anything. It changes what is allowed. Whether homes follow depends on who owns the land and whether the math works.

What would it change in Belmont?

Belmont has four single residence districts. Here is what each requires now, and where the floor would land.

District	Lot size today	Frontage today	Under Question 7
SR-A	25,000 sq ft	125 ft	5,000 sq ft, 50 ft
SR-B	12,000 sq ft	90 ft	5,000 sq ft, 50 ft
SR-C	9,000 sq ft	75 ft	5,000 sq ft, 50 ft
SR-D	25,000 sq ft	125 ft	5,000 sq ft, 50 ft
GR	5,000 sq ft	50 ft	No change

Source: Town of Belmont Zoning By-Law, Section 4.2.1, as amended through March 3, 2025. Belmont approved further amendments at the May 2026 Town Meeting that were pending state review, so confirm the current text with the Office of Community Development.

In SR-A and SR-D, the required lot would shrink by 80 percent. That makes the measure sound enormous in Belmont. Then you read the next page of the by-law.

Belmont’s setbacks do most of the work

A setback is how far a house must sit from each property line. In SR-A and SR-D, Belmont requires 30 feet in front, 15 feet on each side, and 40 feet in back. Those rules survive Question 7, because the measure leaves setbacks to the town.

Take a hypothetical lot, used only to show the math: 5,000 square feet shaped 50 feet wide by 100 feet deep. Apply Belmont’s SR-A setbacks and 20 feet of width and 30 feet of depth remain. That is a 600 square foot footprint. In SR-B and SR-C, the 25 percent lot coverage cap caps a house near 1,250 square feet.

A small lot in Belmont produces a small house unless the town also revisits its size rules. Belmont wrote those setbacks for 25,000 square foot lots. Nobody has decided yet whether they still count as reasonable on a lot a fifth that size. The state housing office would sort that out after the fact.

What would it change in Watertown?

Less, and that is worth knowing. Watertown was mostly built before modern zoning, on small lots. Its ordinance still reflects that.

District	Lot size today	Frontage today	Under Question 7
S-6	6,000 sq ft	65 ft	5,000 sq ft, 50 ft
S-10	10,000 sq ft	80 ft	5,000 sq ft, 50 ft
T	5,000 sq ft	50 ft	No change
R.75 and R1.2	5,000 sq ft	50 ft	No change
CR	40,000 sq ft	100 ft	5,000 sq ft, 50 ft

Source: City of Watertown Zoning Ordinance, Article V, Section 5.04.

S-6 would move by 1,000 square feet. S-10 would move by half. Three residential districts already sit at the proposed floor and would not change.

Question 7 would be a modest adjustment in Watertown and a significant one in Belmont. Two towns that share a border, one law, two very different results. Keep that in mind when you hear someone describe what this does to “the suburbs.”

How would this affect people who already live here?

If you own a large lot. Lot minimums are what stop a big parcel from being split. Lower the minimum and some lots can be split that cannot be split today. That could raise what your land is worth. It could also mean a new house beside one that has had open space next to it for decades. Splitting a lot is never automatic. Frontage, setbacks, lot shape, wetlands, easements, and sewer lines all decide it.

If you are trying to buy here. More legal lots eventually means more homes. Smaller homes tend to cost less than big ones. The effect is real but slow. For context on what entry looks like now: across the trailing 90 days ending September 13, 2026, the median Belmont single-family sale was $1,600,000 and the median Watertown condominium sale was $696,500. Source: MLSPIN.

If you are thinking about selling. Nothing here changes your value this year. What it could change is who your buyer is. On a large parcel in a high-minimum district, a builder becomes a possible buyer alongside a household.

If you are a neighbor. Denser blocks mean more cars and more strain on water and sewer. They mean less space between houses and a different look to the street. Those concerns are fair and worth weighing.

Why do supporters say this is necessary?

The campaign for the measure is Legalize Starter Homes. Its argument is simple. Large lot minimums spread each house across more land. That makes homes scarce and costly, and it pushes builders toward fewer, bigger houses to earn back the land cost.

The National Zoning Atlas published a statewide analysis in 2026. It found that 99 percent of land where single-family homes are allowed carries a minimum lot size rule, that more than half of that land requires at least 40,000 square feet, and that 24 percent requires at least 80,000 square feet. Single-family homes are allowed on 96 percent of residential land. Buildings with four or more units are allowed on 3.5 percent.

Massachusetts ranked 45th among states in new housing built per capita in 2024 and 47th in 2025. The state housing plan, “A Home for Everyone,” calls for 222,000 additional homes between 2025 and 2035, about 22,200 a year. The administration reported more than 34,500 homes added in 2025, ahead of that pace, though production is not spread evenly across communities.

Supporters include the Greater Boston Real Estate Board, the Massachusetts Association of REALTORS®, Abundant Housing Massachusetts, the Home Builders and Remodelers Association of Massachusetts, the League of Women Voters of Massachusetts, and the editorial board of The New York Times.

Why do opponents say this is the wrong approach?

The Massachusetts Municipal Association testified against the measure. Its case rests on three points.

Local control. Executive Director Adam Chapdelaine told the legislature that “zoning decisions are inherently local,” and that a statewide rule removes the role residents and local officials play in shaping their communities.

Capacity is not access. The measure requires that a lot have access to public sewer and water. The MMA points out that many town systems are already at or near their limits. A pipe in the street does not prove there is room in it.

No affordability requirement. Nothing in the measure requires the resulting homes to be affordable or sold below market. Smaller homes usually cost less than larger ones, but the text guarantees nothing about price.

The MMA also argues the state already has a better tool in the Starter Home Zoning Districts program under Chapter 40Y, which encourages small-lot zoning locally through incentives rather than a statewide mandate.

What does a yes vote mean, and what does a no vote mean?

A YES vote means Towns must allow a single-family home on any residential lot of 5,000 square feet with 50 feet of frontage and public sewer and water. More parcels become eligible to be divided and built on, especially in towns with large minimums like Belmont. Over time, more homes and more small homes, which tends to ease price pressure slowly. Denser blocks in places that are spread out today, with the traffic, infrastructure demand, and change in streetscape that follows. One statewide rule replaces a local decision, and towns lose the ability to set a lot minimum above the floor.

A NO vote means Nothing changes. Every city and town keeps setting its own minimum lot size. Belmont keeps requiring 25,000 square feet in SR-A and SR-D, and 9,000 to 12,000 in SR-B and SR-C. Neighborhoods stay at their current density, and growth decisions stay at Town Meeting and City Council. This particular effort to add supply ends, and the state pursues its 222,000-home target another way. The pressure that produced this question does not go away, and something else will likely follow.

Polling suggests the measure is favored. A UMass Poll conducted August 5 to 12, 2026 found 59 percent in support, 21 percent opposed, and 14 percent undecided.

Where does this fit with the state’s housing law?

Question 7 did not appear from nowhere. Governor Healey signed the Affordable Homes Act in August 2024, authorizing $5.16 billion and close to 50 policy changes, including accessory dwelling units by right in single-family districts statewide. The MBTA Communities law, passed in 2021, requires 177 communities to zone for multi-family housing near transit.

Question 7 addresses what those laws left alone. The MBTA Communities law is about apartments near transit. The ADU law is about a second unit on an existing lot. Question 7 is about the lot itself, and about detached single-family homes, which is the form most of Belmont and Watertown is built in.

What should you do before November 3?

Find out what district you are in. Belmont’s zoning map and Watertown’s are both public. Your district determines whether any of this touches you. In Belmont’s GR district or Watertown’s T, R.75, or R1.2 districts, your lot minimum would not change.

Measure your frontage, not just your acreage. The 50-foot frontage requirement disqualifies plenty of large parcels. A deep lot on a narrow street may not qualify no matter how big it is.

Do not price a purchase on what might happen. Buy the house and the neighborhood as they exist today. Zoning changes take years to show up in what gets built.

Ask before you assume. If you own land in Belmont or Watertown and wonder what this could mean for it, that is a measurable question. Bring the plot plan. Our team will look at frontage, setbacks, shape, and utilities and tell you what we see, including when the answer is that nothing changes.

Disclosure and sources

Our professional associations support this measure and have funded the campaign. Through September 4, 2026, supporters had raised $1,717,536. The Greater Boston Real Estate Board contributed $350,000, the Massachusetts Association of REALTORS® PAC contributed $350,000, and the association itself contributed another $150,000. That is roughly half of all money raised. No committee registered in opposition and no opposing money was reported. You should know that before weighing anything we have written.

Sources: Initiative Petition for a Law to Allow Single-Family Homes on Small Lots in Areas with Adequate Infrastructure, filed text and official ballot summary. Town of Belmont Zoning By-Law, Sections 4.2.1 and 4.2.2, as amended through March 3, 2025. City of Watertown Zoning Ordinance, Article V, Section 5.04. National Zoning Atlas, Zoning Report: Massachusetts, 2026. Executive Office of Housing and Livable Communities, “A Home for Everyone.” Massachusetts Municipal Association testimony, March 16, 2026. UMass Poll, August 5 to 12, 2026. Massachusetts Office of Campaign and Political Finance, reports through September 4, 2026. MLSPIN, closed sales June 16 to September 13, 2026.

This article explains a ballot question and does not tell anyone how to vote. It is not legal advice. Zoning questions about a specific parcel should go to your town’s zoning office or a Massachusetts real estate attorney.

The DelRose McShane Team has served Belmont, Watertown, and Greater Boston since 1978. Mike DelRose Jr. is a third-generation REALTOR®, co-leader of the team, and a member of the Board of Directors of the Greater Boston Association of REALTORS®. Reach the team at 617.848.0000 or Homes@DelRoseMcShane.com.