ADU Rental Income in Brookline, MA

ADU Regulations in Brookline

Brookline follows the Massachusetts state baseline under the Affordable Homes Act. This means all Massachusetts state-level ADU rights apply — including by-right approval, no owner occupancy requirement, and standardized size limits. Brookline may also have additional local regulations that supplement the state baseline.

ADU Rental Income in Brookline

An ADU in Brookline can generate $1,500-$3,000+ per month in rental income, depending on size, finishes, and location within the municipality. Long-term rentals are permitted in Brookline. Short-term rentals are not currently allowed for ADUs. For full zoning rules, see our ADU zoning guide for Brookline.

Maximizing Your Rental Returns

To maximize rental income from your ADU in Brookline:

• Build to the maximum allowed size (900 sq ft) for higher rent
• Include in-unit laundry and a full kitchen — tenants pay premium for these
• Add a separate entrance and private outdoor space
• Choose durable, low-maintenance finishes to reduce turnover costs

Is an ADU a Good Investment in Brookline?

With no owner occupancy requirement, you can rent both your main home and ADU for maximum income. Most ADU owners in Massachusetts see their construction costs recouped within 5-10 years through rental income alone, with ongoing property value appreciation on top. See our ADU costs guide for Brookline for a full budget breakdown.