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Zoning official says ADU size set by state; will verify numbers

Londonderry Planning Commission · March 9, 2026
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

Zoning Administrator William Goodwin told the Planning Commission that accessory dwelling unit (ADU) size "comes from the state" and referenced '1000 square feet or 30% of main house' as the rule he would research further.

During the March 9 hearing, William Goodwin flagged accessory dwelling unit (ADU) size limits as set by state standards and said he would confirm the precise figures. He cited that ADU size was set at "1000 square feet or 30% of main house," and pledged to research the statutory basis and confirm which measurement applies.

Commissioners and members of the Housing Commission sought clarity because ADU size affects how much housing can be added to existing lots. Goodwin's pledge to verify the state numbers was recorded as an outstanding staff follow‑up to bring exact statutory citations to the next hearing.