ADU Builders Los Angeles: How to Pick the Right Contractor for Your Backyard Unit

Building an Accessory Dwelling Unit (ADU) in Los Angeles is one of the most innovative ways to expand your property’s value, create rental income, or provide independent living space for family members. But the key to a smooth ADU project is selecting the right contractor. In this guide, we’ll walk you through everything, from understanding the ADU construction process to choosing expert ADU builders Los Angeles homeowners can trust.

Ready to turn your backyard into a valuable living space? Partner with trusted ADU builders in Los Angeles who know the process inside and out. Start your ADU journey with confidence. Contact Us today for a free consultation with GatherADU. Here’s how to confidently navigate the process of choosing the right ADU contractor in Los Angeles for your backyard unit, from first-time planning to final inspection:

Step 1: Understand What an ADU Is and Why You Need a Specialist

Before you hire, make sure you understand the scope of your project. ADUs can take many forms, garage conversions, detached backyard units, or internal conversions. Not every general contractor is experienced with California’s ADU building codes, permit requirements, or utility tie-ins. Look specifically for ADU builders in Los Angeles who:

1. Have worked extensively on ADU projects within LA city limits.
2. Are familiar with SB9, SB13, and local zoning updates.
3. It can help streamline permitting and inspections.

Tip: Ask how many ADUs they’ve completed in your zip code in the last 12 months.

Step 2: Begin with a Site Evaluation and Feasibility Report

A reliable contractor will start with a detailed feasibility study. This includes measuring your lot, checking setbacks, assessing access to utilities, and identifying potential structural or permitting obstacles. This phase determines whether a detached, attached, or garage-converted ADU will best suit your space and budget.

What to expect:

1. Site inspection and slope analysis
2. Preliminary floor plan ideas
3. Budget range estimate
4. Zoning and code check (based on your area)

Pro tip: Avoid contractors who skip the feasibility phase or offer vague cost quotes without visiting your site.

Step 3: Get Transparent Estimates and Construction Timeline

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Before breaking ground, it’s essential to understand exactly what your ADU will cost and how long it will take to build. A trustworthy contractor should provide a clear, itemized estimate covering all aspects of the project, materials, labor, permits, and site work, along with a realistic construction timeline. This transparency helps homeowners plan ahead, avoid budget surprises, and stay on schedule. At GatherADU, we prioritize honest pricing and dependable timelines to give you peace of mind from the start.

Step 4: Verify License, Insurance, and Local Experience

Only hire licensed ADU builders in Los Angeles who:

1. Hold a valid California Contractor’s License (Class B General)
2. Carry general liability and workers’ compensation insurance
3. Can provide at least 3 local references with completed ADU photos
4. Have experience navigating LADBS (Los Angeles Department of Building and Safety)

Check their license on the CSLB website.

Step 5: Choose a Full-Service Builder with Design Support

Choosing a full-service ADU builder with in-house design support simplifies the entire process. These contractors handle everything, from architectural plans and permits to construction, ensuring consistency, faster approvals, and fewer headaches. These builders will have in-house or partnered architects and engineers, helping to:

1. Optimize your ADU layout for space and sunlight
2. Meet building code and Title 24 energy requirements
3. Expedite permit approvals by preparing complete, accurate plans

Look for contractors who use 3D modeling software or virtual walkthroughs.

Step 6: Know the Phases of Construction and Your Role

Understanding the phases of ADU construction, design, permitting, site prep, building, and inspections helps you stay informed and involved throughout the project. Knowing your role, such as approving designs or making timely payments, keeps everything moving smoothly. Clear communication with your builder ensures you stay aligned at every stage. Here’s how most Los Angeles ADU projects unfold:

1. Design & Permitting: 1–3 months
2. Site Prep & Foundation: 2–4 weeks
3. Framing & Roofing: 3–6 weeks
4. Rough Plumbing, Electrical, HVAC: 4–6 weeks
5. Insulation & Drywall: 1–2 weeks
6. Interior Finishes (Cabinets, Flooring, Fixtures): 4–6 weeks
7. Final Inspection & Certificate of Occupancy: 1–2 weeks

Stay in touch with your contractor during each phase and request weekly updates.

Step 7: Review Contracts Carefully Before Signing

Before you sign anything, thoroughly review the contract. A reliable ADU builder in Los Angeles will provide a detailed agreement outlining the scope of work, itemized costs, payment schedule, and timeline. Ensure it includes clear warranty terms and protections against delays. Never proceed without a written agreement that covers:

1. Itemized costs and payment schedule
2. Estimated timeline and penalty clauses for delays
3. Material allowances (flooring, windows, tile, etc.)
4. Warranty coverage and post-construction support

Red flag: Contractors who request more than 10% or $1,000 upfront (whichever is less) are violating California law.

Ready to Build Your Dream ADU? Contact GatherADU—Los Angeles’ Trusted ADU Experts Today!

Planning an ADU in Los Angeles can be stressful, as zoning rules, permits, budget overruns, and unreliable contractors often delay progress and drive up costs. Homeowners are left frustrated, unsure where to turn for help they can trust.

GatherADU simplifies the entire process. From planning and permits to full construction, we handle everything with clarity, speed, and expert local knowledge. With a strong track record across L.A., we deliver quality ADUs on time, on budget, and hassle-free. Call us today at (323) 591-3717 to schedule your free consultation.

Frequently Asked Questions

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How much does it cost to build an ADU in Los Angeles?

Building a detached ADU in Los Angeles costs between $150,000 and $300,000 on average, depending on size, finishes, and site complexity.

Do I need a permit for an ADU in Los Angeles?

Yes. you need permits for all ADU construction. Your contractor should handle all zoning reviews, site plans, and building permit applications.

How long does it take to build an ADU in Los Angeles?

From design to final inspection, most ADUs take 6–9 months. Timelines may extend if there are zoning variances or material delays.

Can I convert my garage into an ADU in Los Angeles?

Yes. Garage conversions are one of the most popular and cost-effective ADU types, especially in LA’s urban neighborhoods.

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