As a homeowner considering an Accessory Dwelling Unit (ADU) under the new Massachusetts bylaw, here are the essential factors to determine if it’s the right fit for your property. These insights come from our professional experience at PMP Consulting Inc., ensuring you make an informed decision:

1. Zoning and Compliance

The recent Massachusetts bylaw simplifies ADU construction as a “by-right” use in single-family residential zones. However, your property must meet basic compliance requirements:

• Unit Size: ADUs must be no larger than 50% of the main dwelling’s size or 900 square feet, whichever is smaller.
• Setbacks and Height: Municipalities can enforce reasonable restrictions on setbacks and height.
• Parking Requirements: If your property is near public transit, you won’t need additional parking for your ADU. Otherwise, the maximum is one additional parking space per unit.

2. Property and Infrastructure Readiness

Your property’s suitability depends on its current infrastructure:

• Utility Capacity: Adding an ADU may require upgrades to water, sewer, or electrical systems.
• Available Space: Assess whether your property has sufficient land or interior space for a compliant ADU.

3. Intended Use

ADUs are versatile, offering solutions for:

• Rental Income: Long-term rentals are permitted, but check local rules for short-term rentals like Airbnb.
• Family Use: They’re ideal for multigenerational living, aging parents, or adult children.
• Future Needs: ADUs can later serve as office space, guest housing, or downsizing options.

Challenges to Consider

• Site Plan Reviews: Municipalities may require reviews to confirm compliance with local guidelines.
• Construction Costs: Building an ADU is a significant investment, depending on size and complexity and ADU may not be the best choice for every property owner