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What Are You Allowed to Build at 20849 Apache Way, Walnut, CA, 91789?

Backyard Cottage

(Detached ADU)

Probably Allowed
This property meets the requirements for a Detached ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit.

In Home Apartment

(Conversion or Addition)

Probably Allowed
This property meets the requirements for an Internal ADU of up to 1,618 sq ft allowed By Right, or possibly more by Special Permit.

Swimming Pool

Probably Allowed
This property likely meets the zoning requirements to build a swimming pool. 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 7,697 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 4,462 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 20849 Apache Way, Walnut, CA, 91789

Zoning Jurisdiction

WALNUT

Parcel ID

8709090083

Property Type

Single Family

Zone

RPD

Year Built

1987

Lot Size

19,241 sq ft

Gross Building Area

2,831 sq ft

Gross Floor Area

3,235 sq ft

Estimated

Living Area

3,235 sq ft

Basement Area

0 sq ft

Impervious Surface

2,831 sq ft

Estimated
14.7%of lot coverage

ADU rules for Walnut, 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 20849 Apache Way, Walnut, CA, 91789?

Backyard Cottage

(Detached ADU)

Probably Allowed
This property meets the requirements for a Detached ADU of up to 1,000 sq ft allowed By Right, or possibly more by Special Permit.

In Home Apartment

(Conversion or Addition)

Probably Allowed
This property meets the requirements for an Internal ADU of up to 1,618 sq ft allowed By Right, or possibly more by Special Permit.

Swimming Pool

Probably Allowed
This property likely meets the zoning requirements to build a swimming pool. 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 7,697 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 4,462 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 20849 Apache Way, Walnut, CA, 91789

Zoning Jurisdiction

WALNUT

Parcel ID

8709090083

Property Type

Single Family

Zone

RPD

Year Built

1987

Lot Size

19,241 sq ft

Gross Building Area

2,831 sq ft

Gross Floor Area

3,235 sq ft

Estimated

Living Area

3,235 sq ft

Basement Area

0 sq ft

Impervious Surface

2,831 sq ft

Estimated
14.7%of lot coverage

ADU rules for Walnut, CA

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

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