Massachusetts voters will have a major housing issue on the November ballot that could change how single-family homes are built across much of the state. Question 7 would establish a 5,000-square-foot minimum lot size for single-family homes in areas with public water and sewer service, replacing larger local minimums in communities where those requirements currently apply.

The proposal gained additional attention this week after Gov. Maura Healey and Lt. Gov. Kim Driscoll announced their support. The measure would apply to municipalities covered by Chapter 40A, meaning Boston would not be affected because it operates under a separate zoning framework. Areas dependent on private wells and septic systems would also generally fall outside the measure.

A Push for Smaller Homes

At the center of the proposal is a simple change to the amount of land required to build a single-family home. Question 7 would allow homes on lots of at least 5,000 square feet with at least 50 feet of street frontage, provided the property has access to public water and sewer.

Local governments would still be able to regulate other aspects of construction, including setbacks, building height, open space and parking. They could also continue regulating whether homes can be used as short-term rentals.

Supporters argue that large minimum lot requirements can make land more expensive and limit the construction of smaller homes. Their position is that allowing smaller lots could create more opportunities for builders to produce homes aimed at first-time buyers and other households priced out of larger properties.

What It Could Mean for Housing Supply

The potential impact could extend well beyond the individual homes built under the measure. Research from Tufts University's Center for State Policy Analysis estimates that Question 7 could generate roughly 750 additional homes per year, although researchers gave a wider possible range of 350 to 1,200 annually because of modeling uncertainty.

The same analysis estimates that the measure could increase single-family construction by about 15% and overall housing development by roughly 5% statewide. The largest effects would likely occur in suburbs, particularly communities near Boston that already have public infrastructure and larger lots that could potentially be divided.

For Massachusetts buyers, the significance is that the proposal targets one of the state's biggest housing challenges: the limited supply of homes that are relatively modest in size and price. More developable lots could give builders additional options, although the final cost of a new home would still depend on land prices, construction expenses, financing and local market conditions.

The proposal has also generated opposition from the Massachusetts Municipal Association, which represents cities and towns. The organization has argued that zoning decisions should remain primarily local and that a statewide standard could reduce the ability of communities to determine their own development rules.

Massachusetts already has a separate voluntary Starter Home Zoning District program that allows participating communities to create districts for modest-sized homes, including requirements involving density, home size and affordability. Question 7 would take a different approach by establishing a statewide minimum lot-size standard in qualifying areas.

For the real estate industry, the November vote could therefore have lasting implications. If approved, Question 7 could open additional land for single-family development and change the economics of building smaller homes in communities where large minimum lots have limited construction. If it does not pass, existing local lot-size rules would remain in place.

With Massachusetts continuing to face high home prices and limited inventory, the debate over Question 7 puts zoning and housing supply directly in front of voters. Whatever happens at the ballot box, the outcome will be closely watched by homeowners, buyers, builders, developers and communities across the state.