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What Are You Allowed to Build at 1421 Iowa St, Pasadena, CA, 91103?
Backyard Cottage
(Detached ADU)
This property may qualify for a Detached ADU of up to 800 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.
In Home Apartment
(Conversion or Addition)
Probably Allowed
This property meets the requirements for an Internal ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit.
Swimming Pool
This property may meet the zoning requirements to build a swimming pool. Some factors may affect feasibility. Based on applicable zoning limits, the estimated buildable area for a pool. Final feasibility may depend on site-specific conditions and local interpretation.
Single Family
Probably Allowed
This property likely meets the zoning requirements to build a Single-Family home up to 1,409 sq ft of zoning-counted floor area allowed By Right, or possibly more by Special Permit.
Multi Family
Home Addition
Probably Allowed
We estimate you can expand this property by up to 800 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
Zoning Jurisdiction
PASADENA
Parcel ID
5729004006
Property Type
Single Family
Zone
RM-12
Year Built
1922
Lot Size
2,596 sq ft
Gross Building Area
1,178 sq ft
Gross Floor Area
979 sq ft
Living Area
780 sq ft
Basement Area
0 sq ft
Impervious Surface
1,178 sq ft
45.4%of lot coverage

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 1421 Iowa St, Pasadena, CA, 91103?
Backyard Cottage
(Detached ADU)
This property may qualify for a Detached ADU of up to 800 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.
In Home Apartment
(Conversion or Addition)
Probably Allowed
This property meets the requirements for an Internal ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit.
Swimming Pool
This property may meet the zoning requirements to build a swimming pool. Some factors may affect feasibility. Based on applicable zoning limits, the estimated buildable area for a pool. Final feasibility may depend on site-specific conditions and local interpretation.
Single Family
Probably Allowed
This property likely meets the zoning requirements to build a Single-Family home up to 1,409 sq ft of zoning-counted floor area allowed By Right, or possibly more by Special Permit.
Multi Family
Home Addition
Probably Allowed
We estimate you can expand this property by up to 800 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
Zoning Jurisdiction
PASADENA
Parcel ID
5729004006
Property Type
Single Family
Zone
RM-12
Year Built
1922
Lot Size
2,596 sq ft
Gross Building Area
1,178 sq ft
Gross Floor Area
979 sq ft
Living Area
780 sq ft
Basement Area
0 sq ft
Impervious Surface
1,178 sq ft
45.4%of lot coverage

Based on public data and AI. Check with a pro. Read More
© 2026 TheBuilder AI Inc. d/b/aFutureLot. All rights reserved.