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Zoning board includes ADU height guidance in annual report, limiting ADU height to two stories or 20 feet

Zoning Board of Adjustment · June 18, 2026
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Summary

The board voted to include draft language in its annual report recommending accessory dwelling units be limited to the lesser of 20 feet above grade or 10 feet lower than the principal structure, clarifying maximum ADU heights and prompting a vote to adopt the annual report.

Montclair’s Zoning Board of Adjustment added recommended ADU height guidance to its annual report during the June 17 meeting and adopted the report by motion.

Board member Miss Harris proposed draft language to relax ADU height limits so a combined garage/ADU could reduce impervious coverage by consolidating structures. ‘‘By increasing the height, you have the ability to have parking and ADU in one structure and limit some of the variances,’’ she said.

The board discussed several formulations and settled on language limiting ADU height to two stories, with a maximum of 20 feet above grade or 10 feet lower than the principal structure, whichever is greater. Counsel and members clarified that the precise wording would be finalized in the adopted report and that the planning department would reconcile grade‑related calculations.

A motion to approve the annual report, including the ADU height language, was made and seconded and carried by voice vote.