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ADU ROI Calculator

Massachusetts state law compliant projections

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Protected Use ADU - State Law Advantage

Your 800 sqft ADU qualifies for BY-RIGHT approval under Massachusetts state law (760 CMR 71.00).

✓No special permit required

✓No Planning Board review

✓No Zoning Board hearings

✓1 month approval vs. 10+ months

Savings: $7,800 in fees + faster time to market

🏠Property Details

Current Property Value

ADU Construction Cost

ADU Size (Square Feet)

sqft

Used to determine Protected Use status under MA state law

Main House Size (Gross Floor Area)

sqft

Excludes basement, attic, garage. Used for 50% GFA limit calculation.

Expected Monthly Rent

🚇Transit Access

Property within 0.5 miles of MBTA station?

Massachusetts state law waives parking requirements within 0.5 miles of transit stations.

💰Financing

Financing Type

⚙️Assumptions

Vacancy Rate

Maintenance

Monthly Cash Flow

After all expenses & debt service

🛡️ Protected Use ADU

Cash-on-Cash

12.2%

Annual return

Cap Rate

12.2%

NOI / Cost

🛡️Massachusetts State Law Savings

Permit fees waived:$4,300

Professional cost reduction:$3,500

Total Savings:$7,800

Time to Market

7 months

3+ months faster than special permit process

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Property Value Increase

+$0

Estimated equity gain

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5-Year Total Return

88.2% ROI

Cash flow + equity + appreciation

Includes $7,500 from faster approval

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Get Your Detailed Report

Personalized PDF with your numbers, state law benefits, and next steps.

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