What is an ADU?

•  Homeowners in Massachusetts can now build ADUs “by right” in many communities. This means that, in most cases, you won’t need special permission or a zoning variance to build an ADU, as long as you meet certain criteria. This simplifies the process of building an ADU and reduces bureaucratic hurdles.
• While the law allows ADUs by right, local municipalities can still set size limits. For example, an ADU may need to be smaller than the primary residence or may need to fit within certain square footage limits. Generally, these units are meant to be small and self-contained. This ensures that ADUs won’t overwhelm neighborhoods or radically change the character of single-family areas.
• Homeowners can convert existing structures like garages, basements, or attics into ADUs or build new structures. The law encourages a variety of design options, as long as the ADU complies with basic safety and zoning rules. This allows homeowners to repurpose underutilized space, making it more cost-effective and efficient.
• One of the goals of the new law is to help address the housing affordability crisis. The law encourages the creation of rental ADUs, which could be used to generate extra income for homeowners or provide affordable rental options for tenants. By increasing rental housing options, Massachusetts hopes to ease the burden of rising rent prices in the state.
• While the state law allows ADUs by right, local municipalities can still impose specific conditions, such as restrictions on the number of ADUs allowed, height restrictions, or rules about how many people can live in an ADU. This gives local governments some control while still supporting ADU development.
•  Building an ADU could increase the value of your property, which may also affect property taxes. However, homeowners are likely to see an increase in property value, especially if they rent out the ADU. This could be a good investment for homeowners looking to increase their property’s worth or generate extra rental income.
• ADUs must meet building codes and safety standards, including those for plumbing, electrical work, and structural integrity. Homeowners should work with licensed contractors to ensure the unit complies with local building codes. This ensures that ADUs are safe for occupancy and provide a reliable living space for renters or family members.

The new laws around Accessory Dwelling Units (ADUs) in Massachusetts aim to make it easier for homeowners to add small, affordable living spaces to their properties. With simplified zoning processes, design flexibility, and an emphasis on affordable housing, these changes will help increase the supply of rental units and offer homeowners a chance to generate additional income or house family members. However, homeowners must still be aware of local regulations and building codes when planning an ADU.