How California Is Making ADUs More Affordable Through Fee Reform
One of the biggest barriers to building an ADU has historically been the maze of fees charged by cities, school districts, utilities, and special districts. In recent years, California's legislature has systematically attacked these barriers — and the savings for homeowners are real. Let's break down the current fee landscape and what recent legislation means for your ADU project.
The Fee Problem: Why It Mattered
Before California began reforming ADU fees, homeowners in some cities faced $30,000-$50,000+ in fees before a single nail was hammered. These included:
- Building permit fees: $2,000-$10,000+
- Plan check fees: $1,500-$5,000+
- Development impact fees: $10,000-$30,000+ (water, sewer, traffic, parks, fire, etc.)
- School fees: $2-$5 per square foot
- Utility connection fees: $5,000-$15,000+ for new water/sewer connections
- Art/cultural fees: Some cities charged per-square-foot cultural enrichment fees
For a project with a property-specific written estimate in construction costs, an additional property-specific written estimate in fees was often a deal-killer.
The Legislative Response
California's legislature has passed a series of bills that dramatically reduce ADU fees:
SB 13 (2019): The Impact Fee Waiver
This was the game-changer. SB 13 established that:
- ADUs under 750 sq ft: ALL impact fees are waived — no development impact fees, no capacity charges, no connection fees
- ADUs 750 sq ft and larger: Impact fees must be proportional to the ADU's size relative to the primary home (typically 30-60% of what a normal home would pay)
- No utility connection fees for garage conversions: If you're converting existing square footage and using existing utility connections, cities cannot charge new connection fees
AB 2221 (2022): Closing Loopholes
AB 2221 addressed several loopholes that cities were using to slow or discourage ADU construction:
- Clarified 60-day review requirement: Cities must approve or deny ADU applications within 60 days, or the application is deemed approved
- Prohibited design standards that increase cost: Cities can't require architectural features that aren't related to health and safety (e.g., they can't mandate expensive roof tiles or custom windows just for aesthetics)
- Streamlined JADU permits: Junior ADUs received additional protections and streamlined processing
- Utility connection limitations: Further restricted when cities can require new utility connections for ADUs
SB 9 (2021): The California HOME Act
While SB 9 is primarily about lot splitting and duplexes, it also affects ADU strategy:
- Lot splitting: Allows qualifying single-family lots to be split into two parcels, each of which can then have an ADU
- Duplex provisions: Allows two units on single-family lots without rezoning
- Combined with ADU law: A homeowner could potentially have a primary home, a duplex, AND an ADU on the same lot through creative application of SB 9 + ADU law (subject to local implementation)
Current Fee Landscape (2026)
Here's what typical ADU fees look like in major SoCal cities after these reforms:
Los Angeles (City):
- Plan check + permit: $3,000-$8,000
- School fees: Construction pricing depends on the site, scope, utilities, and finishes; request a property-specific written estimate.
- Impact fees: Waived for ADUs under 750 sq ft
- Utility connections: Varies, but limited by state law
Long Beach:
- Plan check + permit: $3,000-$7,000
- School fees: Varies by district
- Impact fees: Waived under 750 sq ft
Anaheim / Santa Ana / Orange County cities:
- Plan check + permit: $3,000-$9,000
- School fees: Construction pricing depends on the site, scope, utilities, and finishes; request a property-specific written estimate.
- Impact fees: Waived under 750 sq ft
Pasadena:
- Plan check + permit: $4,000-$10,000 (higher due to potential design review)
- Impact fees: Waived under 750 sq ft
Note: These are approximate ranges. Fees change regularly, and your specific project may vary. Always verify current fees with your city before budgeting.
Strategies to Minimize Fees
- Design to 749 sq ft: If your ADU needs are close to the 750 sq ft threshold, designing just under it can save thousands in impact fees. The difference between a 749 sq ft and 751 sq ft ADU can be $10,000+ in fees.
- Convert existing space: Garage conversions and JADUs within existing homes typically trigger fewer fees than new construction because you're not adding impervious surface or creating new utility demands.
- Use existing utility connections: If your existing home has adequate utility capacity, connecting your ADU to existing lines (rather than installing new connections) avoids connection fees.
- Check for local incentives: Some cities offer additional fee waivers, rebates, or expedited processing for ADUs that commit to affordable rents. LA's ADU Accelerator Program is one example.
- Bundle permits: If you're also doing work on your primary home, bundling permits can sometimes reduce overall fees.
What's Coming Next
The California legislature continues to refine ADU fee policy. Proposals under consideration or recently enacted include:
- Further restricting school fees on ADUs
- Requiring cities to publish clear, itemized fee schedules for ADU projects
- Establishing state-level maximum fee caps
- Creating tax incentives for ADU construction
- Expanding fee waivers to ADUs up to 850 or 1,000 sq ft
The Bottom Line on Fees
Thanks to aggressive state action, ADU fees in California are at historic lows. The total fee burden for a typical ADU project is now typically $5,000-$15,000 — a far cry from the $30,000-$50,000 that was common just a few years ago. This savings makes the financial case for ADU construction stronger than ever.
What This Means for Your Project
Every dollar saved on fees is a dollar that can go toward better finishes, improved energy efficiency, or simply a higher return on investment. At Vision ADU, we track fee changes across every city we work in and can provide accurate fee estimates during your initial consultation.
Get a free property assessment and we'll include a detailed fee estimate for your specific city and project type. Knowledge is power — and knowing your fees upfront eliminates surprises.
---
Vision ADU has navigated permits and fees in over 50 SoCal cities. Book a free consultation or call (866) 668-4264 to get an accurate fee estimate for your ADU project.
Related Vision ADU Resources
- ADU vs Junior ADU vs Garage Conversion: Which Should You Build?
- How Much Does an ADU Increase Your Property Value? (Real LA Data)
- Building an ADU in Torrance, CA: Zoning, Permits, Costs & Everything You Need to Know (2026)
- Building an ADU in Inglewood, CA: Complete 2026 Guide to Zoning, Permits & Costs
- ADU Contractor in Long Beach
- ADU Contractor in Burbank
- Los Angeles County ADU Builder
- Orange County ADU Builder
- Inland Empire ADU Builder
- 2026 ADU Cost Calculator
- All Vision ADU Service Areas