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  1. Zoning
  2. Decatur, IL
  3. R-1

Decatur, IL · zoning record

R-1 zoning in Decatur.

The dimensional standards that govern what you can build in the R-1 district, straight from Decatur'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 (2026-10-03)

R-1 dimensional standards.

These are the letter-of-the-law limits for the base R-1 district. Overlays (historic, neighborhood plan, and similar) can tighten them; a specific address check resolves the overlays that actually apply.

Maximum height

35 ft

How tall the building may be.

“b. Maximum height (feet): 35”SECTION VI. R-1 SINGLE FAMILY RESIDENCE DISTRICT › VI · Decatur code · read 2026-10-03

Minimum lot size

20,000 sf

Smallest conforming lot.

“1. Minimum Lot Area (square feet): 20,000”SECTION VI. R-1 SINGLE FAMILY RESIDENCE DISTRICT › VI · Decatur code · read 2026-10-03

Minimum lot width

80 ft

Narrowest conforming lot.

“2. Minimum Lot Width (feet): 80”SECTION VI. R-1 SINGLE FAMILY RESIDENCE DISTRICT › VI · Decatur code · read 2026-10-03

Front setback

30 ft

Required space from the front line.

“3. Minimum Front Yard (feet): 30”SECTION VI. R-1 SINGLE FAMILY RESIDENCE DISTRICT › VI · Decatur code · read 2026-10-03

Interior side setback

10 ft

Required space from a side line.

“b. Minimum Side: 10”SECTION VI. R-1 SINGLE FAMILY RESIDENCE DISTRICT › VI · Decatur code · read 2026-10-03

Rear setback

20 ft

Required space from the rear line.

“4. Minimum Rear Yard (feet): 20”SECTION VI. R-1 SINGLE FAMILY RESIDENCE DISTRICT › VI · Decatur code · read 2026-10-03

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 Decatur districts on record.

R-2R-6R-3

Check a real Decatur lot against R-1.

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

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