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What Are You Allowed to Build at 360 Ascot Rd, Hillsborough, CA, 94010?

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)

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

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 3,052 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 under current zoning rules. We weren't able to identify a specific size limit, but an addition may be possible horizontally, vertically, or both, depending on design and permitting.

Property facts

Streetview picture of 360 Ascot Rd, Hillsborough, CA, 94010

Zoning Jurisdiction

HILLSBOROUGH

Parcel ID

031202040

Property Type

Two Family

Zone

RD-1

Year Built

1952

Lot Size

12,207 sq ft

Gross Building Area

3,318 sq ft

Gross Floor Area

2,749 sq ft

Estimated

Living Area

2,180 sq ft

Basement Area

0 sq ft

Impervious Surface

3,318 sq ft

Estimated
27.2%of lot coverage

ADU rules for Hillsborough, 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 360 Ascot Rd, Hillsborough, CA, 94010?

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)

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

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 3,052 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 under current zoning rules. We weren't able to identify a specific size limit, but an addition may be possible horizontally, vertically, or both, depending on design and permitting.

Property facts

Streetview picture of 360 Ascot Rd, Hillsborough, CA, 94010

Zoning Jurisdiction

HILLSBOROUGH

Parcel ID

031202040

Property Type

Two Family

Zone

RD-1

Year Built

1952

Lot Size

12,207 sq ft

Gross Building Area

3,318 sq ft

Gross Floor Area

2,749 sq ft

Estimated

Living Area

2,180 sq ft

Basement Area

0 sq ft

Impervious Surface

3,318 sq ft

Estimated
27.2%of lot coverage

ADU rules for Hillsborough, CA

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

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