Question 1

Can I build an ADU in Portland?

Accepted Answer

Many zones in Portland allow ADUs by right under Maine’s LD 2003 (2022). Click any zone on the map to check eligibility.

Question 2

How do I check zoning in Portland?

Accepted Answer

Use the interactive map above — click any of the color-coded zones in Portland to see dimensional standards, ADU eligibility, and setbacks. You can also search by address using the search bar above the map.

Question 3

Do I need a variance for an ADU in Portland?

Accepted Answer

Many residential zones in Portland allow ADUs by right under Maine’s LD 2003 (2022), meaning no variance or special permit is needed.

Question 4

Can I rent out my ADU in Portland?

Accepted Answer

Yes. Under Maine’s LD 2003 (2022), municipalities cannot prohibit ADUs in residential zones. Check your local ordinances for owner-occupancy requirements. Short-term rental regulations (Airbnb, VRBO) are governed separately by municipal ordinance.

Question 5

Which Portland zones allow ADUs without a hearing?

Accepted Answer

Under Maine’s LD 2003, residential zones typically allow ADUs by right — no planning board hearing required. Click any zone on the map for details.

Question 6

Do ADUs have different setback requirements in Portland?

Accepted Answer

Setback requirements vary by zone in Portland — click any zone on the map to see its specific front, side, and rear setback distances. ADUs typically must meet the same setbacks as the primary structure.

Question 7

Can I convert my garage to an ADU in Portland?

Accepted Answer

In zones that permit ADUs by right under Maine’s LD 2003 (2022), garage conversions are generally allowed.

Question 8

What is the difference between ADU by right and by special permit?

Accepted Answer

"By right" means your ADU is approved administratively — you submit plans, meet dimensional standards, and receive a building permit without a public hearing. "By special permit" requires a planning board hearing where neighbors can comment, and approval may include conditions. Maine’s LD 2003 (2022) established ADU by-right statewide in residential zones, simplifying the process for most homeowners. Most zones in our coverage area allow ADUs by right, simplifying the process.

What Can I Build Here? Interactive Zoning Map

Portland Zoning Districts