Trusted ADU contractors in Los Angeles who handle everything from site analysis through final inspection. Cala Builders delivers complete accessory dwelling unit construction with transparent pricing, expert permitting, and proven results.
What ADU Contractors Do
Professional ADU contractors manage the entire process: site assessment, architectural design, permitting, building, and final inspections. We handle coordination with Los Angeles Department of Building and Safety, navigate zoning requirements, and ensure your ADU is compliant and buildable from day one.
Most homeowners underestimate the complexity of ADU projects. Site conditions, utility connections, setback requirements, and parking rules create obstacles that require expertise. Our job is to solve these problems before they become expensive delays.
2026 ADU Laws Create Major Advantages
California’s 2026 ADU laws (SB 9, SB 543, and AB 462) have fundamentally changed how quickly and affordably you can build an ADU in Los Angeles. Under SB 543, your ADU permit can be approved or denied in just 15 business days. Under SB 9, eligible single-family lots can build ADUs without discretionary review or neighborhood hearings.
This is transformative. Projects that took 12-18 months just five years ago now move through permitting in 3-8 weeks. If you’ve been considering an ADU, understanding 2026 ADU laws is the first step. These advantages won’t last forever, permitting requirements may tighten over time. Now is the window to build.
Types of ADUs We Build
Detached ADU
Detached ADUs are standalone structures in your backyard offering maximum privacy and rental income. Typical size: 600–1,000 sq ft. Cost range: $140K–$280K. Build time: 8–12 months.
Garage Conversion ADU
Garage conversions transform existing garages into complete dwelling units. Fastest and most affordable option. Typical size: 400–600 sq ft. Cost range: $85K–$140K. Build time: 4–8 months.
Attached ADU
Attached ADUs share a wall with your main house but have separate entrances and utilities. Ideal for multigenerational living. Typical size: 600–800 sq ft. Cost range: $110K–$200K. Build time: 6–10 months.
Junior ADU (JADU)
JADUs are created within your existing home by converting spare bedrooms or garages. Most affordable option. Typical size: up to 500 sq ft. Cost range: $90K–$150K. Build time: 3–6 months.
Choose Your ADU Floor Plan Size
The right square footage impacts both construction cost and long-term rental income. Here are popular sizes for Los Angeles homeowners:
400 Sq Ft Studio: $85K–$120K. Perfect for guest houses or single professionals. Monthly rental income: $1,200–$1,800.
600 Sq Ft 1-Bedroom: $110K–$160K. Strong demand from long-term tenants. Monthly rental income: $1,600–$2,200. Key benefit: ADUs under 750 square feet avoid California impact fees, saving $5,000–$15,000 in permitting costs.
800 Sq Ft 2-Bedroom: $130K–$210K. Attracts families and roommates. Monthly rental income: $2,000–$2,800.
1,000+ Sq Ft 2-Bedroom, 2-Bath: $155K–$250K. Premium comfort and income potential. Monthly rental income: $2,500–$3,200.
Explore detailed ADU floor plan options tailored to your Los Angeles property and goals.
Transparent ADU Pricing
| ADU Type | Starting Price | Typical Range | Best For |
|---|---|---|---|
| Garage Conversion | $85,000 | $85K–$140K | Fastest, most affordable option |
| Junior ADU | $90,000 | $90K–$150K | In-home conversion, in-law suite |
| Attached ADU | $110,000 | $110K–$200K | Multigenerational living |
| Detached ADU | $140,000 | $140K–$280K | Maximum privacy and income |
What’s included in every price: Site analysis, custom architectural design, all city permit fees and filing, foundation, framing, plumbing, electrical, HVAC, insulation, drywall, flooring, interior finishes, and final inspection sign-off. No hidden costs.
What to Expect: ADU Project Timeline
Month 1: Site analysis and feasibility assessment. We review your property, zoning, utility connections, and preliminary costs.
Month 2: Architectural design. Custom floor plans and technical drawings submitted to LA Department of Planning.
Month 2-3: Permitting (SB 543 timeline). Under 2026 laws, the city has 15 business days to approve or deny. Most straightforward projects receive approval in 3-8 weeks.
Month 3-4: Building permits issued. Final inspections scheduled with LA Department of Building and Safety.
Month 4-12: Construction. Typical ADU builds take 6-9 months depending on ADU type and site conditions.
Month 12: Final inspection and certificate of occupancy. Your ADU is complete and legal for occupancy.
Frequently Asked Questions
How long does ADU permitting take in Los Angeles?
Under SB 543, the city has 15 business days to approve or deny your permit application. For straightforward projects meeting all objective standards, approval typically takes 3-8 weeks. Coastal zone projects may require additional state review and take longer.
What do 2026 ADU laws mean for my project?
California’s 2026 ADU laws (SB 9, SB 543, and AB 462) make ADU construction faster and more affordable. SB 9 eliminates discretionary review for eligible single-family lots. SB 543 speeds permits to 15 business days. AB 462 relaxes owner-occupancy restrictions. Learn more about ADU permits and design in Los Angeles and how they apply to your property.
What’s the best ADU size for cost savings?
ADUs under 750 square feet avoid California development impact fees, saving $5,000–$15,000 in permitting costs. A 600–750 sq ft one-bedroom hits this sweet spot perfectly: impact fee exemption, strong rental demand ($1,600–$2,200/month), and streamlined permitting under state law.
Can I live in my ADU while the main house is rented?
Yes. Under AB 462, owner-occupancy restrictions have been relaxed. You can live in the ADU while renting the main house, or vice versa. Verify LA-specific rules for your property type, but generally yes, this is now allowed.
Do I need a licensed architect for my ADU?
Yes. California law requires all ADU plans to be designed and stamped by a licensed architect or engineer. This is non-negotiable and ensures your project meets all code requirements.
How much rental income can I expect?
Los Angeles ADU rental rates depend on size and neighborhood: Studios $1,200–$1,800/month, 1-bedrooms $1,600–$2,200/month, 2-bedrooms $2,000–$2,800/month, 2BR/2BA $2,500–$3,200/month. Most homeowners recover construction costs within 7-10 years.
What if my lot has difficult terrain or setback constraints?
Challenging lots are solvable. We’ve designed successful ADUs on narrow urban lots, hillside properties, and sites with utility complications. Our team assesses your specific conditions and finds practical solutions. Review our guide on common ADU construction mistakes to avoid costly delays before you start.
Can I convert my garage to an ADU?
Yes. Garage conversions are the fastest and most affordable ADU option. Garage conversion contractors transform existing structures into complete 400–600 sq ft ADUs in 4-8 months.
Ready to Explore Your ADU Options?
Not sure which ADU type fits your property? We can help you navigate options, understand your timeline, and get a clear cost estimate. Explore financing options for your ADU project before your consultation.
View ADU Floor Plan Options | Read 2026 ADU Laws | Schedule Your Free Consultation
Start Your ADU Project with Cala Builders
Licensed, insured, and trusted by homeowners across Los Angeles County (License #1156496). We handle site analysis, design, permitting, and construction, managing every detail so you don’t have to.
📞 Call (310) 861-6850
Expert ADU contractors in Los Angeles. Transparent pricing. Fast permits. Licensed & insured.
