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  1. Zoning
  2. Ann Arbor, MI
  3. R4B

Ann Arbor, MI · zoning record

R4B zoning in Ann Arbor.

The dimensional standards that govern what you can build in the R4B district, straight from Ann Arbor's ordinance, with every figure quoting its source. Check a specific address to see how these rules apply to a real lot.

Free · Every figure cited · Read from the current code (2026-10-02)

R4B dimensional standards.

These are the letter-of-the-law limits for the base R4B district. Overlays (historic, neighborhood plan, and similar) can tighten them; a specific address check resolves the overlays that actually apply.

Minimum lot size

14,000 sf

Smallest conforming lot.

“R4B 15 ft. 20 ft. plus ft. when 14,000 sq. ft. 120 ft.”TABLE 5.17-3: MULTIPLE-FAMILY RESIDENTIAL DISTRICTS › MIN. AREA › R4B row · Ann Arbor code · read 2026-10-02

Minimum lot width

120 ft

Narrowest conforming lot.

“R4B 15 ft. 20 ft. plus ft. when 14,000 sq. ft. 120 ft.”TABLE 5.17-3: MULTIPLE-FAMILY RESIDENTIAL DISTRICTS › WIDTH › R4B row · Ann Arbor code · read 2026-10-02

Front setback

15 ft

Required space from the front line.

“R4B 15 ft. 20 ft. plus ft. when 14,000 sq. ft. 120 ft.”TABLE 5.17-3: MULTIPLE-FAMILY RESIDENTIAL DISTRICTS › FRONT › R4B row · Ann Arbor code · read 2026-10-02

Sources

Every figure above is quoted verbatim from the current ordinance. We never substitute a typical-for-zone default: a field absent from the record shows nothing, not a guess.

Informational only — not a permit, appraisal, or professional engineering opinion. Verify with your local planning department before acting on it. See Terms and data sources.

Other Ann Arbor districts on record.

R4ER4AR3R4CR4D

Check a real Ann Arbor lot against R4B.

See how these standards resolve on a specific parcel, with the overlays that actually apply, in about 20 seconds.

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