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What Are You Allowed to Build at 78 Williams St, San Leandro, CA, 94577?

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

Might be Allowed
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

Might be Allowed
This property may meet the zoning requirements to build a Single-Family home up to 18,272 sq ft of zoning-counted floor area allowed By Conditional Use Permit, or possibly more by Special Permit. Additional factors may affect feasibility.

Multifamily

Home Addition

Might be Allowed
The property may meet the zoning requirements to build a Home Addition up to 15,411 sq ft of zoning-counted floor area. Additional factors may affect feasibility.

Property facts

Streetview picture of 78 Williams St, San Leandro, CA, 94577

Zoning Jurisdiction

SAN LEANDRO

Parcel ID

7754911

Property Type

Other

Zone

DA-3

Year Built

1948

Lot Size

5,220 sq ft

Gross Building Area

2,225 sq ft

Gross Floor Area

2,861 sq ft

Estimated

Living Area

2,861 sq ft

Basement Area

0 sq ft

Impervious Surface

2,861 sq ft

Estimated
54.8%of lot coverage

ADU rules for San Leandro, 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 78 Williams St, San Leandro, CA, 94577?

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

Might be Allowed
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

Might be Allowed
This property may meet the zoning requirements to build a Single-Family home up to 18,272 sq ft of zoning-counted floor area allowed By Conditional Use Permit, or possibly more by Special Permit. Additional factors may affect feasibility.

Multifamily

Home Addition

Might be Allowed
The property may meet the zoning requirements to build a Home Addition up to 15,411 sq ft of zoning-counted floor area. Additional factors may affect feasibility.

Property facts

Streetview picture of 78 Williams St, San Leandro, CA, 94577

Zoning Jurisdiction

SAN LEANDRO

Parcel ID

7754911

Property Type

Other

Zone

DA-3

Year Built

1948

Lot Size

5,220 sq ft

Gross Building Area

2,225 sq ft

Gross Floor Area

2,861 sq ft

Estimated

Living Area

2,861 sq ft

Basement Area

0 sq ft

Impervious Surface

2,861 sq ft

Estimated
54.8%of lot coverage

ADU rules for San Leandro, CA

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

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