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What Are You Allowed to Build at 438 W Duarte Rd, Monrovia, CA, 91016?

Backyard Cottage

(Detached ADU)

Might be Allowed
This property may qualify for a Detached ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.

In Home Apartment

(Conversion or Addition)

Might be Allowed
This property may qualify for an Internal ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.

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 Allowed
This property likely meets the zoning requirements to build a Single-Family home up to 24,296 sq ft of zoning-counted floor area allowed By Right, or possibly more by Special Permit.

Multifamily

Home Addition

Probably Allowed
We estimate you can expand this property by up to 17,370 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 438 W Duarte Rd, Monrovia, CA, 91016

Zoning Jurisdiction

MONROVIA

Parcel ID

8509009050

Property Type

Residential

Zone

RH

Year Built

1927

Lot Size

32,395 sq ft

Gross Building Area

11,774 sq ft

Gross Floor Area

6,926 sq ft

Estimated

Living Area

2,078 sq ft

Basement Area

0 sq ft

Impervious Surface

11,774 sq ft

Estimated
36.3%of lot coverage

ADU rules for Monrovia, CA

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 438 W Duarte Rd, Monrovia, CA, 91016?

Backyard Cottage

(Detached ADU)

Might be Allowed
This property may qualify for a Detached ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.

In Home Apartment

(Conversion or Addition)

Might be Allowed
This property may qualify for an Internal ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit, but there are some special considerations.

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 Allowed
This property likely meets the zoning requirements to build a Single-Family home up to 24,296 sq ft of zoning-counted floor area allowed By Right, or possibly more by Special Permit.

Multifamily

Home Addition

Probably Allowed
We estimate you can expand this property by up to 17,370 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 438 W Duarte Rd, Monrovia, CA, 91016

Zoning Jurisdiction

MONROVIA

Parcel ID

8509009050

Property Type

Residential

Zone

RH

Year Built

1927

Lot Size

32,395 sq ft

Gross Building Area

11,774 sq ft

Gross Floor Area

6,926 sq ft

Estimated

Living Area

2,078 sq ft

Basement Area

0 sq ft

Impervious Surface

11,774 sq ft

Estimated
36.3%of lot coverage

ADU rules for Monrovia, CA

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

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