What Can I Build Here? Interactive Zoning Map
Address data from OpenStreetMap
South Portland has 47 zoning districts — the most of any covered municipality. Zones range from suburban residential to waterfront commercial. Check ADU eligibility by clicking any zone.
South Portland Zoning Districts
LD 1829: What You Can Build Now
Educational Information Only: This is a summary of LD 1829 for informational purposes and does not constitute legal advice. Zoning regulations are complex and subject to municipal interpretation. Always consult a qualified attorney for property-specific guidance before making development decisions.
- 1 dwelling unit per lot (typical)
- ADU requires owner occupancy
- Planning board review for 3+ units
- 3 dwelling units per lot (by right)
- 4 units in growth areas with utilities
- No owner occupancy required
- No planning board for 4 or fewer units
Already planning an ADU? LD 1829 removes the owner-occupancy requirement — you may build an ADU and rent out both units.
Read our LD 1829 Quick Reference Guide →Officially titled ‘An Act to Build Housing for Maine Families,’ LD 1829 is a Maine state law (signed June 2025) that may allow a minimum of 3 dwelling units per residential lot in municipalities governed by city councils. It builds on LD 2003 (2022), which established ADU by-right statewide, and removes the owner-occupancy requirement for ADUs.
Read our LD 1829 guide →Yes — LD 1829 applies to residential zones in South Portland and other city-council municipalities, effective July 1, 2026. Properties in designated growth areas with water and sewer access may qualify for up to 4 units.
Read the full zoning guide →Under LD 1829, residential lots may allow up to 3 dwelling units by right. Lots in designated growth areas with municipal water and sewer may qualify for up to 4 units. All units remain subject to existing dimensional standards (setbacks, height limits, lot coverage).
Browse ADU models for Maine →LD 1829 takes effect July 1, 2026 for municipalities governed by city councils (including Portland, South Portland, and Westbrook). Town-meeting municipalities have until July 1, 2027.
Estimate your project costs →V-STARA™ zoning data provides screening-level feasibility estimates. Final dimensional constraints and requirements must be verified during the formal municipal permitting phase.