What Can You Build Without a Permit in California? (2026)
The 30-second answer for California
In California, the projects you can usually build without a building permit are a small detached shed, a short freestanding deck, a fence under the height cap, a low retaining wall, and cosmetic interior work. The exact limits California enforces are in the table below — and your city can be stricter than the state. The catch every homeowner needs to hear: even when no permit is required, the building code, zoning setbacks, and any HOA rules still apply. Permit-exempt means the paperwork is waived, not the rules.
How California sets the rules
California has a MANDATORY statewide building code, not home-rule: the California Building Standards Code (Title 24, CCR), applicable in every city and county under Health & Safety Code 18938. Residential work follows the 2025 California Residential Code (Title 24, Part 2.5), based on the 2024 IRC, effective January 1, 2026. Local governments must enforce it and may adopt only MORE-restrictive amendments, and only with express findings of local climatic, geological, or topographical conditions filed with the state (H&S 17958.7); 2025's AB 130 further froze most residential code changes and new local amendments from October 1, 2025 through June 1, 2031.
Permit-exempt limits in California
These are the thresholds we verified for California. Treat each one as the most you can usually do without pulling a permit — a stricter city amendment always wins.
| Project | California permit-exempt limit |
|---|---|
| Detached shed / accessory building | TIGHTER than the IRC baseline. 2025 CRC Section R105.2 exempts a one-story detached accessory structure only if floor area is 120 sq ft or less (California amends the model IRC's 200 sq ft down to 120). Larger sheds need a permit. Even an exempt shed remains subject to the WUI/Chapter 7A fire rules where applicable. The City of Los Angeles also conditions its exemption on height 12 ft or less, roof projection 24 in or less, and no electrical/plumbing/mechanical. |
| Deck | Follows the IRC 4-part test. CRC R105.2 exempts a deck only if ALL apply: 200 sq ft or less in area, not more than 30 inches above grade at any point, not attached to a dwelling or townhouse, and does not serve the required exit door (R318.4). Fail any one and a permit is required. Cities add zoning limits — Los Angeles excludes decks in hillside/overlay zones from the exemption. |
| Fence | Follows the IRC baseline: CRC R105.2 exempts fences 7 ft high or less (measured from adjacent grade). Pool/spa barrier fences are never exempt. Many jurisdictions are tighter or add zoning caps: the City of Los Angeles and LA County exempt masonry/concrete fences only to 6 ft, and local zoning commonly limits front-yard fences to about 3.5-4 ft regardless of the building-permit exemption. |
| Retaining wall | Follows the IRC baseline: CRC R105.2 exempts retaining walls not over 4 ft measured from the bottom of the footing to the top of the wall, unless the wall supports a surcharge. Some jurisdictions are stricter — Ventura County drops the exemption to 3 ft by local amendment. |
| Patio (on grade) | On-grade work is broadly exempt: CRC R105.2 lists sidewalks and driveways as permit-exempt with no square-foot cap in the state text, and on-grade concrete slabs/patios are treated the same. A raised patio, platform, or deck is exempt only if 30 inches or less above grade and not built over a basement or story below. Zoning setbacks, lot-coverage, and stormwater rules still apply. |
Baseline: 2021 International Residential Code, Section R105.2. See the national project-by-project guide for how each threshold works.
Can you do the work yourself in California?
Yes. Under the owner-builder exemption (Business & Professions Code 7044) a homeowner may pull the permit and perform work on their own property without a contractor's license, signing an Owner-Builder Verification at the building counter. Trap: if you sell within one year of completion, the law presumes the project was built for sale and you lose the exemption. A permit exemption never waives code or zoning, and unpermitted work must be disclosed to a buyer at resale.
What's different about California
Wildfire (WUI) rules apply even to permit-exempt structures
In designated Fire Hazard Severity Zones, even a permit-exempt shed must still meet the California Wildland-Urban Interface / Chapter 7A ignition-resistant construction standards. R105.2 itself notes exempt accessory structures remain regulated by the WUI code.
120 sq ft, not 200
California tightened the model IRC's 200 sq ft shed exemption to 120 sq ft statewide. A common 12x14 (168 sq ft) storage shed that needs no permit in an IRC-baseline state DOES require one in California.
Mandatory statewide code, now frozen by AB 130
California is not home-rule for building standards; Title 24 applies everywhere and local agencies can only add stricter rules with state-filed climatic/geological/topographical findings. AB 130 (2025) froze residential code updates and most new local amendments from Oct 1, 2025 to June 1, 2031.
"Permit-exempt" does not mean rule-free
I spent 25 years as a firefighter before I built PermitDeck, so let me be blunt about the part that gets people hurt. "No permit" never means "no rules." When a project is exempt in California, three things are still true — and now you are the one responsible for them, because no inspector is coming to check:
- Building code still applies. An exempt deck in California still has to meet the structural rules of IRC R507 — real footings, a proper ledger, and guards. A shed still has to carry your local snow and wind load. The code does not care whether a permit was pulled.
- Zoning and setbacks still apply. Exempt does not mean you can put it anywhere. Setbacks from property lines, easements, lot-coverage caps, and corner-lot sight lines all still bind you — and a neighbor complaint can force you to move it.
- HOA rules are separate. Your HOA architectural review is a private contract, not a government permit. You can be fully permit-exempt with your city and still be forced by your HOA to tear something out.
The big California cities
Permits are pulled locally, so your city's building department has the final word. Here are the two largest, with a link straight to their office.
Los Angeles
LA Dept. of Building & Safety exempts a one-story detached accessory building of 120 sq ft or less only when height is 12 ft or less, roof projection is 24 in or less, and NO electrical, plumbing, or mechanical is installed.
Los Angeles building departmentSan Diego
The exempt-project list lives in San Diego Municipal Code 129.0203; the statewide 120 sq ft detached-accessory limit applies, and many small in-kind residential jobs qualify for a No-Plan Building Permit rather than being fully exempt.
San Diego building departmentTurns out you do need a permit? We'll match you with pros who pull it
If your project crosses one of these Californiathresholds, the cleanest path is to hire a licensed pro who pulls the permit in their own name and stands behind the inspection. Tell us the project once and we'll send it to up to three verified local pros. It's free, it's capped at three, and we never sell your information — the opposite of the lead-farm sites.
Get matched with up to 3 verified pros
Share your project once and we'll send it to up to 3 verified general contractor pros in your area. Free for you, free for them. Never shared with more than 3, and never with anyone we have not verified.
What happens if you needed a permit and skipped it
Guessing wrong on the exemption is not a small risk. The common outcomes are a stop-work order, a fine (often double the normal permit fee), and being ordered to open finished work back up for inspection or tear it out. The expensive part usually lands later: unpermitted work routinely kills a home saleat the buyer's inspection, and an insurance claim can be denied if the damage traces back to unpermitted construction. Most jurisdictions do allow a retroactive (after-the-fact) permit — it costs more, but it clears the record.
Full detail: what happens if you build without a permit and how to get a building permit.
California permit-exemption FAQs
How big a shed can I build in California without a building permit?
Up to 120 square feet of floor area, one story. California's Residential Code Section R105.2 tightens the national 200 sq ft model down to 120, so anything larger needs a permit. Even an exempt shed must still meet zoning setbacks, HOA rules, and, in a wildfire (WUI) zone, fire-resistant construction standards.
Do I need a permit to build a backyard deck in California?
Only if it exceeds the exemption. Statewide, a deck is permit-exempt only when it is 200 square feet or less, no more than 30 inches above grade, freestanding (not attached to the house), and does not serve a required exit door. Miss any one condition and a permit is required. Cities like Los Angeles add hillside and overlay-zone limits.
Can I pull my own permit and do the work myself in California?
Yes. Under the owner-builder exemption (Business & Professions Code 7044) a homeowner can permit and perform work on their own home without a contractor's license, signing an owner-builder declaration. But if you sell within one year of completion, the law presumes you built it for sale and you lose the exemption. Any unpermitted work must be disclosed at resale.
Does California have one statewide building code, or does it vary by city?
California has a mandatory statewide code: the 2025 California Residential Code (Title 24, Part 2.5, based on the 2024 IRC), effective January 1, 2026. It is not home-rule. Every city and county must enforce it and can add only stricter rules backed by state-filed climatic, geological, or topographical findings. AB 130 froze most changes through June 2031.
Sources we verified against
- 2025 California Residential Code, Section R105.2 Work Exempt From Permit (Title 24 Part 2.5)
- California DGS Building Standards Commission — Title 24 codes
- California HCD — 2025 California Building Standards Code, effective January 1, 2026
- California Business & Professions Code 7044 — owner-builder exemption
- CSLB — Owner-Builder overview (one-year resale presumption)
- Los Angeles County Building & Safety — Work Exempt from Permit
- City of San Diego — Building Permit (exemptions per Municipal Code 129.0203)
Every threshold on this page is anchored to California's building code or the sources listed above. Where a number varies by city and we could not verify it, we say "verify locally" rather than guess — a permit page you cannot trust is worse than no page at all.
Find a verified pro in California
Permit or not, a licensed pro builds it to code the first time. Browse our verified directories — phone and website on every listing, and we never sell your info.
Related guides
Get weekly cost & permit updates
Join homeowners who get free insights on project costs, permit changes, and money-saving tips. No spam — unsubscribe anytime.
Free forever. No credit card. Unsubscribe in one click.