Summary
- Location
- Riverside County, California, USA
- County-level accepted plans
- 4 accepted plans
- Providers
- 1 provider
- Origin programs
- 1 program
- Plan size range
- 499 to 909 sq ft
- Permit sources
- 8 sources
County context
Riverside County Pre-Approved ADU Plans
Browse official city and county pre-approved ADU plan programs in Riverside County, California.
Program Overview
This Riverside County page summarizes source-backed county context for Riverside County, California. The current export lists 1 city program page in this county and 4 county-level accepted-plan records. County-level plan sources include Riverside County TLMA Building & Safety Department, Riverside County TLMA Planning Department, and Riverside County / Design Path Studio. Provider names include Design Path Studio.
County records may apply only in unincorporated areas or county-administered jurisdictions, so verify the official source before relying on a plan for an incorporated city. County fee and permit data includes 4 fee records and 8 permit requirement records. Missing source fields remain Not listed in source, and directory records do not guarantee permit approval.
Included Locations
City
Riverside, Riverside County, California, USA
4 accepted plans
County-Level Accepted Plans
4 plans Source-backed record Government PDF
- Provider
- Design Path Studio
- Origin program
- Riverside County, California, USA
- Accepted location
- Riverside County, California, USA
- Size
- 499 sq ft
- Bedrooms
- Studio
- Bathrooms
- 1 bath
- Last checked
- May 4, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Source-backed record Government PDF
- Provider
- Design Path Studio
- Origin program
- Riverside County, California, USA
- Accepted location
- Riverside County, California, USA
- Size
- 625 sq ft
- Bedrooms
- 1 bed
- Bathrooms
- 1 bath
- Last checked
- May 4, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Source-backed record Government PDF
- Provider
- Design Path Studio
- Origin program
- Riverside County, California, USA
- Accepted location
- Riverside County, California, USA
- Size
- 749 sq ft
- Bedrooms
- 2 beds
- Bathrooms
- 1 bath
- Last checked
- May 4, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Source-backed record Government PDF
- Provider
- Design Path Studio
- Origin program
- Riverside County, California, USA
- Accepted location
- Riverside County, California, USA
- Size
- 909 sq ft
- Bedrooms
- 2 beds
- Bathrooms
- 2 baths
- Last checked
- May 4, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Permit Requirements
8 requirementsAll
Eligible Zoning
R-1, R-2, R-2A, R-A, R-R, R-1A, R-3, R-3A, R-4, R-6, R-7, R-D, A-1, A-2, A-P, W-2, W-2-M, N-A
- Last checked
- May 4, 2026
- Notes
- Single-family residential zoning required; property must be developed or proposed to be developed with a single-family dwelling.
All
Flood Hazard Area Restriction
If located within Floodplain, plans must be pre-approved by County of Riverside Flood Control
- Last checked
- May 4, 2026
- Notes
- Contact rcflood.org or call 951-955-1200.
All
Environmental Constraint Area Restriction
Project site cannot be located within Environmental Constraint Area per recorded map or approved ERP/HANS exhibit
- Last checked
- May 4, 2026
- Notes
- Verify via Map My County or contact Environmental Programs - Planning Dept.
Detached
Maximum Detached ADU Size
1,000 sf
- Last checked
- May 4, 2026
- Notes
- Per Riverside County ARA standards.
Attached
Maximum Attached ADU Size
50% of primary dwelling floor area or 800 sf, whichever is greater, not to exceed 1,000 sf
- Last checked
- May 4, 2026
- Notes
- Not listed in source
Junior ADU
JADU Maximum Size
500 sf
- Last checked
- May 4, 2026
- Notes
- Not listed in source
All
Setbacks
4 feet from side and rear; front yard per zoning
- Last checked
- May 4, 2026
- Notes
- Not listed in source
All
Hold Harmless Agreement
Required for use of permit-ready/pre-approved plans
- Last checked
- May 4, 2026
- Notes
- Not listed in source
Fees
4 fee recordsAll
Permit Ready ADU (BRS-PRADU) Permit Deposit
$4,348.86
- Last checked
- May 4, 2026
- Notes
- Riverside County Building & Safety official fee schedule - deposit fee.
All
Standard ADU (BRS-ADU) Permit Deposit
$6,691.95
- Last checked
- May 4, 2026
- Notes
- Standard non-pre-approved ADU permit deposit; for comparison.
Junior ADU
Junior ADU (BAR-JADU) Permit Deposit
$2,111.65
- Last checked
- May 4, 2026
- Notes
- Not listed in source
All
PRADU Plan PDF Cost
Free
- Last checked
- May 4, 2026
- Notes
- Per County: 'Permit Ready ADUs (BRS-PRADU) are free standard plans available to the public, though submission, construction, and site-specific details will incur costs.'
Official Sources
8 sourcesPermit Ready ADU - Building & Safety, Riverside County TLMA
- Publisher
- Riverside County TLMA Building & Safety Department
- Last checked
- May 4, 2026
Riverside County Additional Residential Accommodations (ARA)
- Publisher
- Riverside County TLMA Planning Department
- Last checked
- May 4, 2026
Building and Safety Fee Schedules - Riverside County TLMA
- Publisher
- Riverside County TLMA Building & Safety Department
- Last checked
- May 4, 2026
PRADU Plan 1 - 499 sf Studio (V2)
- Publisher
- Riverside County / Design Path Studio
- Last checked
- May 4, 2026
PRADU Plan 2 - 625 sf 1BR/1BA (V2)
- Publisher
- Riverside County / Design Path Studio
- Last checked
- May 4, 2026
PRADU Plan 3 - 749 sf 2BR/1BA (V2)
- Publisher
- Riverside County / Design Path Studio
- Last checked
- May 4, 2026
PRADU Plan 4 - 909 sf 2BR/2BA (V2)
- Publisher
- Riverside County / Design Path Studio
- Last checked
- May 4, 2026
Pre-Approved ADU Plans Hold Harmless Statement - County of Riverside
- Publisher
- Riverside County Building & Safety Department
- Last checked
- May 4, 2026