Riverside County covers 7,200 square miles. Its permitting requirements reflect that scale: when the county says "fully dimensioned," it means every measurement—every property line, every setback, every structure dimension—must appear on the plan. When the county says "three sets," it means three complete, identical, professionally prepared plan sets.
The good news: California law lets property owners prepare their own plans. You just need to prepare them right, three times, in the correct plan size.
Do You Need a Site Plan for a Small Permit in Riverside County?
Yes. The Riverside County Building and Safety Department requires a fully dimensioned site plan as part of every building permit application.
The site plan must include:
- All property lines with dimensions.
- Adjacent streets (labeled with street names).
- Driveways (location and dimensions).
- Setbacks (all required distances from structures to property lines).
- All structures — existing and proposed, with dimensions.
- Easements (all recorded easements and their dimensions).
- Off-street parking spaces (shown and dimensioned).
- A North arrow.
- A scale (minimum 1" = 20').
- A title block with owner name, project address, construction type, occupancy group, applicable code editions, and sheet index.
Three complete sets of all plans are required. If soil reports, structural calculations, or Title 24 Energy reports are included, two copies of each are needed.
Who Runs Into This in Riverside County
- Temecula, Murrieta, and Menifee residents who submit permit applications to the county, only to be redirected to their city's own building department.
- Palm Desert homeowners who discover they must submit to the City of Palm Desert, not the county, despite being surrounded by unincorporated desert communities.
- Rural homeowners whose properties are in a Fire Hazard Severity Zone and who submit plans without the required prior Fire Department approval, causing their application to be held.
- DIYers who submit a single set of plans instead of three, leading to an immediate rejection.
What Needs a Site Plan in Riverside County
- Fence permit site plan — Required where a fence requires a building permit.
- Shed permit site plan — Required for permitted accessory structures.
- Deck / Patio Cover permit site plan — Required for decks and patio covers.
- Pool permit site plan — Required. Must show pool, equipment, barriers, and flood zone notation.
- Garage permit site plan — Required. Garage opening to front requires minimum 18-foot setback from front property line.
- Addition permit site plan — Required. Must show expanded footprint, all setbacks, off-street parking, and lot coverage.
- ADU — Site plan required. County offers free pre-approved ADU standard plans.
Why This Trips People Up in Riverside County
The Three-Set Requirement. Riverside County does not accept a single set of plans. Every residential building permit requires three complete, identical sets of all plan sheets. This is a hard requirement—missing even one set means an incomplete application.
Floodplain Pre-Approval. If your property is in a FEMA-mapped Special Flood Hazard Area, you must obtain floodplain permit approval from the county's Floodplain Administration before a building permit will be issued. Your site plan must show the FEMA flood zone designation and Base Flood Elevation (BFE) if applicable.
Fire Hazard Severity Zones. Much of unincorporated Riverside County—especially the foothill, mountain, and desert fringe areas—is in a Fire Hazard Severity Zone (FHSZ) or Very High Fire Hazard Severity Zone (VHFHSZ). Projects in these areas may require Fire Department approval before the building permit application is accepted.
Garage Front Setback. Garages with openings facing the front of a lot require a minimum 18-foot setback from the front property line. This is a common catch—homeowners adding a new garage or moving a garage door location without accounting for this rule.
The 500 sq ft ADU Rear Yard Encroachment. In R-1 zones, portions of the primary dwelling may encroach up to 10 feet into the required rear yard setback, but the total encroachment cannot exceed 500 square feet in area. This is relevant when adding a room addition in a tight rear yard.
Zoning and Setbacks in Riverside County
Residential Zone Setbacks:
- R-1-7000 (standard single-family): Front 25 ft / Side 5 ft / Rear 15 ft / Max height 35 ft / Max coverage 40%.
- R-1-8500: Front 25 ft / Side 5 ft / Rear 20 ft / Max coverage 40%.
- R-1-13000 (estate): Front 30 ft / Side 10 ft / Rear 25 ft / Max coverage 30%.
- R-3 (multi-family): Front 20 ft / Side 10 ft / Rear 15 ft.
ADU Setbacks:
- Detached ADUs: Minimum 4 feet from rear and side property lines.
- Front setback: Complies with base zone (typically 25 ft in R-1 zones).
How the Tool Handles This — 5 Steps
SitePlans.ai loads Riverside County parcel data so you can generate the fully dimensioned site plan required by PLUS Online:
- Enter your address — Lot lines load from the Riverside County Assessor GIS.
- Place your project — Add your pool, ADU, or addition.
- Dimension all setbacks — Label all required distances from structures to all property lines.
- Note flood and fire zones — Annotate FEMA flood zone and fire hazard designation if applicable.
- Export a clean PDF — Download the site plan for inclusion in your three complete plan sets.
Where This Tool Fits — and Where It Doesn't
| Situation | Best path |
|---|---|
| Shed, deck, pool, or ADU in unincorporated Riverside County | SitePlans.ai for the required site plan component of the three plan sets |
| Property in a fire hazard zone | SitePlans.ai for layout + Fire Department pre-approval required |
| Property in a flood zone | SitePlans.ai for layout + floodplain permit approval required |
| New single-family home | Property owner may prepare plans; Title 24 energy calculations required |
| Disputed property lines | Licensed CA Land Surveyor required |
What This Doesn't Replace
Our site plan maker online tool helps create preliminary, conceptual site plans for residential projects where California law allows property-owner-prepared drawings. It is not a licensed land survey, Title 24 energy calculation, or flood elevation certificate. Three complete sets of all plan sheets are required for every Riverside County building permit.
Comparison: Your Options for a Riverside County Site Plan
| Method | Cost | Time | Stamp | Notes |
|---|---|---|---|---|
| Self-prepared plans | Free | 2–4 hrs | ✗ | CA law allows owner-prepared plans; must produce three identical sets |
| SitePlans.ai | Free first plan | Minutes | ✗ | Generates the site plan component of your three-set submission |
| CAD drafter | $400–$1,000+ | 1–2 weeks | Sometimes | Useful for larger or more complex projects |
| Licensed CA Engineer/Architect | $1,000–$4,000+ | 2–6 weeks | ✅ | Required for commercial, fire zone projects, structural work |
| SitePlans.us (done-for-you) | Custom | 1–3 days | ✗ | Best if your PLUS Online plan check returned corrections |
Common Mistakes That Delay Riverside County Permits
- Submitting fewer than three sets — Only one or two sets of plans submitted; immediate rejection.
- Wrong plan size — Plans smaller than 18" × 24" or larger than 30" × 42" are not accepted.
- Missing fire zone pre-approval — Submitting to Building and Safety without prior Fire Department sign-off for FHSZ properties.
- Missing floodplain approval — Proceeding with a building permit application without first resolving floodplain permit requirements.
- Applying to the county for a city property — Submitting an application for a property inside Temecula, Murrieta, Menifee, or another city.
Support and Local Resources
- Riverside County TLMA — Building and Safety — tlma.countyofriverside.us/building/ | Call (951) 955-3200.
- PLUS Online Portal — plus.countyofriverside.us — submit permit applications.
- Map My County GIS — gis1.countyofriverside.us/MapMyCounty/ — verify jurisdiction and check flood/fire zone status.
- FEMA Flood Maps — msc.fema.gov
Nearby Counties
- Orange County site plan guide — West
- San Bernardino County site plan guide — North
- San Diego County site plan guide — South
- California permit site plan requirements
Frequently Asked Questions
1. How many sets of plans does Riverside County require?
Three complete, identical sets of all plan sheets are required for every building permit application.
2. Can I prepare my own plans for a Riverside County permit?
Yes. California law allows property owners to prepare their own plans for their own residential property.
3. What is the standard plan size?
24" × 36" is standard. Minimum is 18" × 24" and maximum is 30" × 42". All sheets in a plan set must be the same size.
4. What happens if my property is in a flood zone?
A floodplain permit approval from Riverside County is required before a building permit will be issued.
5. Does my project need Fire Department approval?
If your property is in a Fire Hazard Severity Zone or Very High Fire Hazard Severity Zone, Fire Department approval may be required before submitting a building permit application.
6. Can I use SitePlans.ai for a Riverside County permit?
Yes. SitePlans.ai generates a fully dimensioned site plan with all required elements for inclusion in your three complete plan sets submitted through the PLUS Online portal.
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Start Your Riverside County Site Plan
Verify your jurisdiction using the Map My County GIS tool first. Then enter your address below to pull your property lines, place your project, label all setbacks, and download the fully dimensioned site plan for your three-set PLUS Online submission.
Build My Riverside County Site Plan →
Got a plan check correction from Building and Safety? Send the comments to SitePlans.us and we'll draft the revision.
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