Accessory Dwelling Units ("ADUs"), Junior ADUs, Second Units, and Guest Houses
  DRAFT ORDINANCE AVAILABLE FOR COMMENT

The draft Additional Residential Accommodations Ordiance, which includes ADUs, is available for public review. Click here for more information.

Questions?
Please contact:
 
Robert Flores
Phone (951) 955-1195 
(Hablo Español)
RIVERSIDE COUNTY ADU, JUNIOR ADU, SECOND UNIT AND GUEST HOUSE STANDARDS*
 STANDARD  State Riv. Co. Ordinance No. 348


Accesory Dwlling Unit (ADU)
(existing or new, up to 1-bedroom)

JUNIOR ADU
(interior
conversion
of house)
SECOND UNIT
(SU)
Guest Quarter
(GQ)
Interior
(conversion
of structure)
Detatched
 

Single Family

1 unit/lot
(not allowed if
JADU exists)

1 unit/lot
(not allowed if a
detached SU
or GQ exists)

1 unit/lot
(not allowed if
Int. ADU exists) 

1 unit/lot
(not allowed if a
detached ADU
​or GQ exists)

1 unit/lot
(not allowed if
detached
ADU or
SU exists) 

Multifamily

1 unit/lot
(or a quantity that is
≤ 25% of existing
multifamily units,
whichever is greater)

2 units/lot

N/A N/A N/A
 
Kitchen Full Full

Minimum:
cooking
appliance,
prep. counters,
storage cabinets

Full

None allowed

Bathroom

Minimum:
toilet, shower, sink

Minimum:
toilet, shower, sink

Minimum:
toilet, shower, sink
(shared facilities
w/house permitted)

Minimum:
Toilet, shower, sink

Optional
 
Lot Size


Permitted on
any lot size

Permitted on
any lot size


Permitted on
any lot size

> 7,200 s.f.


Permitted on
any lot size

Lot Coverage Set by zoning classification

Setbacks

(rear/side)

Per zoning

4 feet,
with 1 ft. overhang

Per zoning Per zoning Per zoning
Floor Area

≤ 50% of primary unit
floor area (or 850 s.f.,
whichever is less)
& up to
1-bedroom
units

 Max.: 850 s.f.
& up to
1-bedroom unit

≤ 50% of primary
unit floor area
(or 500 s.f.,which-
ever is less)

Max. floor area
depends on lot size:

- up to 1,200 s.f. unit
(7,200-20,000 s.f. lots);

- up to 1,500 s.f. unit
(20,000 s.f.-1.99 ac. lots)

- up to 2,500 s.f.
(2 ac.-3.99 ac. lots)

- up to 200% of
primary house area
(4+ ac. lots)

2% of lot size
(or 600 s.f,
whichever
is less)

Height Per zoning Max.: 16 feet Per zoning


No taller than
primary unit

Per zoning

Parking
(Replace-
ment parking
if existing
space(s) are
converted?)

1 space/unit - regular or tandem spaces
(no replacement parking required)

No parking required if unit is:
1. Within 1/2 mile walking distance of transit; or
2. Within Architectually/historically significant
     district; or
3. Part of an existing structure; or 
4. Within area that requires parking permits
     but none are offered to unit; or
5. Within 1 mile walking distance of car share area

None required
(no replacement
parking required)

1 space for
one-bedroom units; or
2 spaces for units
with two or more units
-regular or tandem spaces
(replacement may be ​required)

None
required
(replacement
may be
required)

 
Review

60 days from complete application, if primary unit exists
(Per Building Code, if primary unit is new)

Per Building Code
Occupancy

Owner does not need
to live onsite

Owner must
live onsite

Owner must live onsite

*Draft standards: the above standards may be amended from time to time to correct errors or update interpretations. Last updated: 3.5.20
PDF version: Standards Matrix (draft)

Additional Residential Accommodations Ordinance (including ADUs)

Change of Zone No. 2000002 is an ordinance amendment to Riverside County Ordinance No. 348 (the “Land Use Ordinance”) that creates an article, which identifies and regulates different types of dwellings or living arrangements that may be created on a lot in addition to a primary residence.  This amendment specifically addresses state-mandated accessory dwelling units (“ADUs”), junior accessory dwelling units (“Junior ADUs”), and ranchets (related to ADUs) and locally-permitted second units and guest quarters; and specifically re-establishes and updates existing regulation for units under the Coachella Valley Multiple Owners Mobilehome Housing Overlay Zone, also known as MOG units. 

NOTE: This DRAFT amendment is now available for public review and comment. The amendment is being prepared by staff to be taken to the Planning Commision for consideration. The Planning Commission hearing is scheduled for May 20, 2020 (continued from May 6, 2020).

Contact Information

 


Robert Flores, Urban & Regional Planner IV
Riverside County Planning Department
4080 Lemon St., 12th Floor
Riverside, CA  92501
(951) 955-1195

rflores@rivco.org

Attachments


DRAFT Additional Residential Accommodations Ordinance - Ordinance No. 348.4926 (PDF) - Originally Posted 4.24.2020

- Draft ARA Ordinance - Ord. No. 348.4926 (PDF) - Revised/Posted 5.15.2020 

- Draft ARA Ordinance - Ord. No. 348.4926 (PDF) - PC approved - Posted 5.28.2020

WORKSHOPS
The Riverside County Planning Department is held two Planning Commission workshops (East and West County) to provide information on state regulations, answer questions, and get input and feedback.
 
Workshop Documents: