What is the minimum lot size in Montclair, NJ?

In Montclair's single-family zones: R-O requires 20,000 sq ft; R-O(a) requires 13,000 sq ft. Undersized existing lots may still be buildable under the ordinance, so check your specific lot.

How big a house can I build in Montclair, NJ?

It depends on the zone, lot size, setbacks, building coverage, height and any floor area limit. Enter an address in our free lot check to get a rough maximum home size for that lot in Montclair.

Montclair, NJ Zoning: Minimum Lot Sizes, Setbacks & What You Can Build

Single-Family Zones

Montclair zoning, zone by zone.

Zone	Min lot (sq ft)	Min width	Front	Side (each / total)	Rear	Bldg coverage	Height
R-O R-O Mountainside Zone (one-family)	20,000	100 ft	50 ft	12 ft / 30 ft	30 ft	20%	35 ft / 2.5 st
R-O(a) R-O(a) One-Family Zone	13,000	100 ft	50 ft	12 ft / 30 ft	30 ft	20%	35 ft / 2.5 st
R-1 R-1 One-Family Zone			25 ft	6 ft / 16 ft	25 ft	25%	35 ft / 2.5 st

Source: Chapter 347 Zoning, Township of Montclair (zone Articles IV-X; Article III General Lot and Building Regulations), Adopted 4-15-1980 (Ord. 80-12), as amended. Read 2026-09-28. Only zones we could confirm from the ordinance are shown. Rules change and have exceptions (corner lots, undersized lots, steep slopes, overlays), so confirm with the town zoning officer before you buy or design.

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