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What Are You Allowed to Build at 101 W 1st St, Ofallon, IL, 62269?

Backyard Cottage

(Detached ADU)

Probably Not Allowed
This lot does not meet the requirements for a Detached ADU. A variance may be requested through your local zoning authority

In Home Apartment

(Conversion or Addition)

Probably Not Allowed
This lot does not meet the requirements for an Internal ADU. A variance may be requested through your local zoning authority

Swimming Pool

Probably Not Allowed
This property likely does not meet the zoning requirements for a swimming pool. A variance or other zoning relief may be required. Final feasibility may depend on site-specific conditions and local interpretation.

Single Family

Probably Not Allowed
This lot does not meet the zoning requirements to build a Single-Family home. A variance may be requested through your local zoning authority

Multifamily

Home Addition

Probably Allowed
We estimate you can expand this property by up to 2,200 sq ft under current zoning rules. This may allow for a horizontal addition, a vertical addition, or both, depending on design and permitting.

Property facts

Streetview picture of 101 W 1st St, Ofallon, IL, 62269

Zoning Jurisdiction

OFALLON

Parcel ID

04300404017

Property Type

Residential

Zone

B-1

Year Built

Lot Size

2,130 sq ft

Gross Building Area

2,061 sq ft

Gross Floor Area

2,061 sq ft

Estimated

Living Area

2,061 sq ft

Basement Area

0 sq ft

Impervious Surface

2,061 sq ft

Estimated
96.7%of lot coverage

ADU rules for Ofallon, IL

Based on public data and AI. Check with a pro. Read More

© 2026 TheBuilder AI Inc. d/b/aFutureLot. All rights reserved.

What Are You Allowed to Build at 101 W 1st St, Ofallon, IL, 62269?

Backyard Cottage

(Detached ADU)

Probably Not Allowed
This lot does not meet the requirements for a Detached ADU. A variance may be requested through your local zoning authority

In Home Apartment

(Conversion or Addition)

Probably Not Allowed
This lot does not meet the requirements for an Internal ADU. A variance may be requested through your local zoning authority

Swimming Pool

Probably Not Allowed
This property likely does not meet the zoning requirements for a swimming pool. A variance or other zoning relief may be required. Final feasibility may depend on site-specific conditions and local interpretation.

Single Family

Probably Not Allowed
This lot does not meet the zoning requirements to build a Single-Family home. A variance may be requested through your local zoning authority

Multifamily

Home Addition

Probably Allowed
We estimate you can expand this property by up to 2,200 sq ft under current zoning rules. This may allow for a horizontal addition, a vertical addition, or both, depending on design and permitting.

Property facts

Streetview picture of 101 W 1st St, Ofallon, IL, 62269

Zoning Jurisdiction

OFALLON

Parcel ID

04300404017

Property Type

Residential

Zone

B-1

Year Built

Lot Size

2,130 sq ft

Gross Building Area

2,061 sq ft

Gross Floor Area

2,061 sq ft

Estimated

Living Area

2,061 sq ft

Basement Area

0 sq ft

Impervious Surface

2,061 sq ft

Estimated
96.7%of lot coverage

ADU rules for Ofallon, IL

Based on public data and AI. Check with a pro. Read More

© 2026 TheBuilder AI Inc. d/b/aFutureLot. All rights reserved.