Verified ADU builders in Los Angeles.

Los Angeles is the largest ADU construction market in the United States. Since California’s ADU reform laws took effect in 2017, the city has issued more than 20,000 ADU permits — more than any other municipality in the country. The combination of high housing demand, large residential lots, and state-level legislation removing local barriers has made ADU construction in Los Angeles one of the most practical paths to adding housing in LA.

ADU construction costs in Los Angeles are higher than most California markets but the rental income potential is unmatched. Whether you’re searching for ADU builders near you or comparing licensed contractors across LA County, every builder on this page has been verified against active CSLB records. License status, bond coverage, workers’ compensation insurance, and complaint history daily using public records from the California Contractors State License Board.

The Los Angeles Department of Building and Safety (LADBS) processes ADU permits for properties within the City of Los Angeles. Under current California law (AB 68, SB 13, AB 881, AB 976), most single-family homeowners can build at least one ADU and one JADU on their property. Key points of the LA permitting process:

• Standard Plan Program: LADBS offers a Standard Plan program with pre-approved ADU designs. These plans can significantly reduce permitting time since the structural and engineering review is already complete.
• Detached ADUs: Up to 1,200 sq ft on single-family lots. Must maintain 4-foot rear and side setbacks.
• Attached ADUs: Up to 50% of the primary dwelling’s floor area, with a maximum of 1,200 sq ft.
• JADUs: Up to 500 sq ft, must be within the existing footprint of the primary dwelling or attached garage.
• Garage conversions: No additional parking replacement required under current state law.
• Permit timeline: LADBS is required to approve or deny ADU applications within 60 days of a complete submission. Standard Plan ADUs may be approved faster.
• SB 9 lot splits: Some Los Angeles homeowners may also qualify for SB 9 lot splits, allowing two units on a single-family lot in addition to ADUs.

Construction costs in Los Angeles are generally higher than other California markets due to labor costs, permitting complexity, and site conditions. The following ranges are based on market data from Los Angeles-area builders:

These estimates include permitting, site preparation, construction, and basic finishes. Costs for utility connections, engineering, and design vary by project. Permit fees in Los Angeles typically range from $4,000 to $15,000 depending on ADU size and complexity. Hillside lots, soil conditions, and seismic retrofitting can increase costs significantly. For a detailed breakdown, see our ADU construction cost in California guide.

ADU construction activity varies across Los Angeles. The following neighborhoods and areas have seen the highest concentration of ADU permits:

• San Fernando Valley: Neighborhoods including Woodland Hills, Sherman Oaks, Encino, and Studio City have large lots ideal for detached ADUs. The Valley accounts for a significant share of LA’s total ADU permits.
• Silver Lake and Echo Park: Popular for garage conversions and JADUs due to smaller lot sizes and high rental demand.
• Highland Park and Eagle Rock: Northeast LA has seen steady ADU growth, particularly garage conversions and attached additions.
• West Los Angeles: Culver City, Mar Vista, and Palms have active ADU markets driven by proximity to employment centers and high rental values.
• South Los Angeles: Increasingly active market for ADUs, with many homeowners using ADUs as income-generating rental units.

Note: Properties in unincorporated Los Angeles County are permitted through the LA County Department of Public Works, not LADBS. The process and fees differ. Contact your local building department to confirm which jurisdiction applies to your property.

Every builder on VerifiedADU goes through a multi-point verification process before appearing on this page. The following are checked against CSLB public records maintained by the California Contractors State License Board:

1. Active CSLB license — The contractor holds a current, active license with the appropriate classification for ADU construction (typically B – General Building).
2. Contractor bond — A surety bond is on file as required by California law, providing financial protection for consumers.
3. Workers’ compensation insurance — The contractor carries workers’ comp coverage or has filed a legal exemption.
4. Complaint history — The contractor’s CSLB complaint and disciplinary record is reviewed before listing. Contractors with unresolved complaints are not listed.

License data is refreshed daily. If a builder’s license status changes, their listing is updated or removed automatically. You can verify any contractor’s license independently at cslb.ca.gov. For a detailed explanation of our process, see How Builders Are Verified.

Los Angeles follows California’s statewide ADU laws. Key regulations include:

• No owner-occupancy requirement for ADUs (JADUs may have owner-occupancy requirements under certain conditions).
• No parking requirements for ADUs within half a mile of public transit — which covers most of Los Angeles.
• Impact fees are waived or reduced for ADUs under 750 sq ft.
• Height limits: Detached ADUs can be up to 16 feet (single story) or 18 feet if within half a mile of transit. Two-story ADUs may be allowed with additional height allowances under AB 976.
• Hillside regulations: Properties in designated hillside areas may face additional requirements including geotechnical reports, grading permits, and fire safety setbacks.
• Historic preservation: ADUs on properties in Historic Preservation Overlay Zones (HPOZs) may require additional design review.

For the most current regulations, consult the LADBS ADU information page or speak with a licensed ADU builder in our directory.

From permit submission to completion, most ADU projects in Los Angeles take 10 to 18 months. Permitting typically takes 6 to 12 weeks through LADBS (faster with Standard Plans), with construction taking 5 to 10 months depending on project scope, site conditions, and contractor availability.

ADU costs in LA range from $100,000 for a basic garage conversion to $450,000+ for a large detached unit with premium finishes. The average cost for a 500 sq ft detached ADU in Los Angeles is approximately $250,000 to $300,000 including permits, site work, and construction.

The San Fernando Valley (Woodland Hills, Sherman Oaks, Encino) has the most ADU activity due to large lot sizes. However, ADUs are being built across Los Angeles — from Silver Lake to South LA to the Westside. The best neighborhood depends on your property’s lot size, zoning, and your goals (rental income vs. family use).

Properties within the City of Los Angeles are permitted through LADBS (Los Angeles Department of Building and Safety). Properties in unincorporated LA County areas are permitted through the LA County Department of Public Works. The processes, fees, and timelines differ. Check your property’s jurisdiction before starting the permit process.

Under current California law, there is no owner-occupancy requirement for standard ADUs. However, JADUs (junior ADUs) may require the property owner to occupy either the primary residence or the JADU.

Yes. California law prohibits local governments from banning long-term rental of ADUs. However, ADUs built after January 1, 2025 cannot be used as short-term rentals (less than 30 days) unless local ordinances specifically allow it. Los Angeles has additional short-term rental regulations through its Home-Sharing Ordinance.