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(925) 239-4165 ext: 560
Schedule ADU Consultation (925) 239-4165 ext: 560

San Ramon ADUs

Everything about building Accessory Dwelling Units in San Ramon, CA

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San Ramon ADU Guidelines Last Updated 10/13/20

The city government of San Ramon will approve ADUs under California's statewide mandated regulations.
The California Building Code (CBC) 2019 is adopted.
Relevant state bill updates for SB13, AB68, AB881, AB670 are shown in green below.


hintsights

City Hint: The city permitted a total of 4 ADU projects in the past year of 2019, which is below the average compared to other cities in California.


Number of ADUs allowed:

According to state law, all single-family homes are allowed at least one ADU. Additionally, single-family properties which are owner-occupied may create one ADU and one Junior ADU. Also, multi-family properties may now add one ADU per every four existing residential units, so long as they were legally established.

As of January 1st, 2020

Types of ADUs allowed:

Detached ADU, Attached ADU, Junior ADU are approved. ADUs may be new construction or converted from existing space. JADUs must be converted from existing space.

Lot size:

Residential lots will not be subject to any minimum lot size for Accessory Dwelling Unit (ADU)s by ordinance or of the underlying zoning district. ~ According To AB68

As of January 1st, 2020

ADU size:

An ADU attached or constructed within an existing building shall be at least 150 sq. feet, but not more than 50% of the net floor area, or 850 square feet, whichever is greater.

A detached ADU studio or one -bedroom unit shall be at least 150 sq. ft. and shall not exceed a maximum of 850 square feet. A detached ADU with more than one bedroom shall contain at least 150 square feet and shall not exceed a maximum of 1,000 square feet.

As of January 1st, 2020

Setbacks:

1. An attached ADU shall conform to the setbacks required of the primary unit within the zone. No additional setbacks are required for the conversion of an existing structure into an ADU.
2. A detached accessory dwelling unit shall be set back a minimum of 20 ft. from the front property line, 4 ft. from the side property line, and 4 ft. from the rear property line

As of January 1st, 2020

Parking:

An ADU must have one covered or uncovered parking space in addition to the parking required for the primary unit. The parking space may be located within a required setback on a compliant parking surface or as a tandem space on an existing driveway.
A unit shall not be required to provide parking if:
a. The accessory dwelling unit is located within one-half mile of public transit. (For the purpose of this paragraph, public transit means any established bus stop associated with the bus services available for general public, such as but not limited to County Connection).
b. The accessory dwelling unit is located within an architecturally and historically significant historic district.
c. The accessory dwelling unit is part of the existing primary residence or an existing accessory structure.
d. When on-street parking permits are required, but not offered to the occupant of the accessory dwelling unit.
e. When there is a car share vehicle located within one block of the accessory dwelling unit. (For the purpose of this paragraph, car share vehicle means a passenger vehicle available at a designated location for general public by reservation and with a fee, such as but not limited to vehicles managed by Zipcar.)

As of January 1st, 2020

Fire Safety:

Per state minimum requirements.

Shape, materials and style:

1. The exterior shall be built in harmony with the immediate neighborhood.
2. Outside access shall not be in the front of the existing building.
3. The ADU shall be designed to minimize potential privacy issues with the neighboring properties, and additional landscape screening may be required.

Height:

1. The height of an attached accessory dwelling is based on maximum height allowed in the applicable residential zone.
2. The height of a detached accessory dwelling shall be limited to 16 feet

Design review:

Ministerial review per state standards.

Number of Bedrooms:

Not specified by State Standards.

Ownership:

Rental of the primary or accessory dwelling unit shall not be for a term of 30 days or less unless approved for “lodging uses” pursuant to the zoning ordinance.

As of January 1st, 2020

Utility connections:

Local health officer approval where a private sewage disposal system is being used, if required. (State requirements)

Permit Fees

SB13 Update: As of January 1st, 2020, local impact fees for ADUs will be reduced substantially statewide.

Definition:

Definitions.
1. Attached dwelling unit. A dwelling unit that has one or more party
walls in common with another dwelling unit.
2. Detached dwelling unit. A dwelling unit that does not share any walls
in common with another dwelling unit.
3. Secondary unit. An attached or detached rental dwelling unit located
on a lot which contains a single-family dwelling. A secondary unit
shall include provisions for living, eating, sleeping, cooking and
sanitation. A secondary unit is not considered an accessory building as
defined in Division D2 and Division D8 (Glossary).

Allowed Zones:

*** Beginning in 2020, according to state law, all residential zoning districts, including single-family and multi-family, are allowed to build Accessory Dwelling Units. ***

Secondary units are permitted in the RC, HR, RE, RS, RM, RMH, and in PD zones for residential uses on lots with a single-family dwelling.

As of January 1st, 2020

Existing Structures

Non-conforming units. Where the existing dwelling unit constitutes a legal
non-conforming unit, a secondary unit may be constructed only if the nonconformity
is not expanded and the secondary unit meets all current applicable
zoning standards.

SB13 Update: Amnesty program to permit unpermitted units will be administered statewide, allowing non-health and safety code violations to be deferred.

Residential Building Code:

The California Building Code (CBC) 2019 is adopted.

San Ramon City Planning Offices
Permitting

Call/Text ADU Operator (925) 239-4165
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ADU Example Designs

ADU Model 440 sqft

W 22 ft L 20 ft

ADU Model 594 sqft

W 27 ft L 22 ft

San Ramon ADU Marketplace

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Read San Ramon Housing Market Update

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[CA] Governor Brown Issues Legislative Update http://imperialvalleynews.com/ 2017-10-08

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Estimate ADU Potential
Financing
Costs / ROI

SELECT ADU SIZE & TYPE

APPRECIATION ESTIMATE

* upon completion of ADU

CONSTRUCTION COST ESTIMATE

* based on local average price per sqft

RENTAL ESTIMATE

* estimated by location

MORTGAGE ESTIMATE

* 30 years / 5% interest rate / 20% down payment

SELECT ADU SIZE & TYPE

Size: 500 sqft

BASED ON LOCAL AVERAGE PROPERTY DATA & VALUE

Appreciation Estimate = (Base Value: $) / (Home's Living Space: sqft) * (ADU's Living Space: sqft)

Rental Estimate = (Rent Per Sqft: $4.49) * (ADU's Living Space: sqft)




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Everything you need to get accurate estimates from contractors for your ADU project. Get help with ADU feasibility, design, permitting and sourcing contractors for your project in one place.

ADU Property Report

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ADU Contractor Estimates

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Find ADU Contractors


Check your property's zoning, browse designs & get contractor estimates for your ADU project:

Everything you need to get accurate estimates from contractors for your ADU project. Get help with ADU feasibility, design, permitting and sourcing contractors for your project in one place.

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