The Real Costs 2026
ADU Cost in Los Angeles
The Cali Builders Standard
Why Our Estimates are Different
We don’t just quote labor and materials. We build for longevity and compliance. As a 3rd-generation construction firm, we’ve refined a process that eliminates the “hidden costs” that often plague ADU projects.
Many contractors provide low-ball quotes to win the job. They then add “change orders” for things they should have seen coming. We take a different approach:
In-House Oversight:
Heritage Expertise:
Predictable Milestones:
Call Us For
Free Consultation
Certifications & Compliance
Lead-Safe Construction
Safety is not an option; it is a requirement. Cali Builders is an EPA Lead-
Safe Certified Firm.
Many homes in Los Angeles were built before 1978. These properties
often contain lead-based paint. Disturbing this paint during an ADU build
or garage conversion can create serious health risks for your family.
Certified Protection:
Strict Compliance:
Peace of Mind:
As Featured In
Our commitment to transparency and craftsmanship has earned Cali Builders recognition in some of Los Angeles’ most prominent publications.
ADU Construction Costs in Los Angeles (2026 Investment)
Most ADU projects in Los Angeles currently range from $110,000 to over $450,000. Your specific investment depends on structural needs, utility distances, and site conditions. At Cali Builders, we provide detailed project estimates that account for every technical variable before we break ground.
Project Investment by ADU Category
These ranges reflect current market data for high-standard construction in the San Fernando Valley and Greater Los Angeles.
Estimated Investment Range
$110k – $170k
Estimated Investment Range
$185k – $300k
Estimated Investment Range
$260k – $450k+
Detached Build : Ground-up Standalone (Up to 1,200 sq. ft.)
Estimated Investment Range
$80k – $135k
Cali Builders & Construction Inc.
Professional ADU Development
Frequently Asked Questions!
Have a question in mind? Here’s a list of commonly asked questions that might help you find quick answers.
How much does it cost to build an ADU in Los Angeles in 2026?
On average, ADU construction in Los Angeles ranges from $300 to $500 per square foot.
Garage Conversions: $100,000 – $175,000
Detached New Construction: $220,000 – $400,000+
Attached ADUs (Additions): $150,000 – $300,000
Why are costs higher in Los Angeles than in other areas?
What are the "hidden costs" I should budget for?
Beyond construction, you should set aside funds for:
Soft Costs: Architectural plans and structural engineering ($8,000 – $15,000).
Utility Connections: Trenching and hooking up water, sewer, and electricity ($5,000 – $15,000).
Impact Fees: While units under 750 sq. ft. are exempt from many impact fees, larger units can incur charges between $5,000 and $20,000.
Site Prep: If your yard has a slope or requires tree removal, expect to add $5,000 – $15,000.
Do I need solar panels for my ADU?
Will building an ADU increase my property taxes?
Yes, but only for the new value added to the property. Your primary home’s tax assessment will remain the same. Generally, you can expect property taxes to increase by roughly 1% to 1.25% of the ADU’s construction cost.
Is it cheaper to build a larger ADU?
While the total price increases with size, the cost per square foot actually decreases. For example, a 400 sq. ft. studio might cost $450/sq. ft., whereas a 1,200 sq. ft. unit might drop to $300/sq. ft. because expensive fixed costs (like the kitchen and bathroom) are spread over more area.
Can I do short-term rentals (Airbnb) in my LA ADU?
In the City of Los Angeles, short-term rentals (less than 30 days) are generally prohibited in ADUs. They are intended for long-term housing. Most owners find a better ROI through steady long-term rental income, which averages $2,200 – $3,800/month in LA.
How long does the process take from start to finish?
In 2026, the typical timeline in LA is 10 to 14 months:
Design & Planning: 2–3 months
Permit Approval: 3–6 months
Construction: 5–7 months