California’s ADU laws have transformed the home improvement landscape. If you own a single-family home in Los Angeles, you likely have the right to build an Accessory Dwelling Unit — and it might be the single best investment you can make in your property.
This guide covers everything LA homeowners need to know about ADU and garage conversions — regulations, costs, timelines, and how to choose the right contractor.
What Is an ADU?
An Accessory Dwelling Unit (ADU) is a secondary housing unit on a single-family residential lot. ADUs can be:
- Garage conversions — Converting an existing garage into a living space
- Detached ADUs — New standalone structures in the backyard
- Attached ADUs — Additions built onto the existing home
- Junior ADUs (JADUs) — Conversions within the existing home footprint (up to 500 sq ft)
California ADU Laws: What Changed
California has passed multiple laws making ADUs easier to build:
- AB 68 & SB 13: Streamlined permitting, reduced fees, eliminated parking requirements in many cases
- AB 881: Restricted HOA ability to block ADUs
- Size limits: Up to 1,200 sq ft for detached ADUs, 800 sq ft for JADUs
- Setbacks: Reduced to 4 feet for rear and side yards
- Owner-occupancy: No longer required through 2025 (extended in many jurisdictions)
ADU Construction by LA Area
ADU regulations and demand vary across the Los Angeles area:
San Fernando Valley: Sherman Oaks, Studio City, Van Nuys, Northridge, and Encino are hotspots for ADU construction. Larger lots and detached garages make conversions straightforward. The rental market here is strong, with ADUs typically commanding $1,800-$2,500/month.
Westside: Culver City, Mar Vista, Venice, and Santa Monica have high rental demand that makes ADU investment particularly attractive. Santa Monica has its own ADU ordinance with some additional requirements.
Eastside: Highland Park, Eagle Rock, Silver Lake, and Los Feliz are seeing rapid ADU adoption as homeowners monetize their properties in these increasingly desirable neighborhoods.
South Bay: Redondo Beach, Hermosa Beach, and Manhattan Beach homeowners are building ADUs for rental income and multigenerational living. Beach city ADUs command premium rents.
Glendale & Burbank: Glendale and Burbank have their own building departments and ADU ordinances. Both cities have streamlined their ADU permitting processes in recent years.
Garage Conversion vs. New Construction ADU
Garage Conversion
Converting an existing garage is typically the fastest and most cost-effective path to an ADU. The structure already exists — you’re adding insulation, drywall, flooring, a kitchen, bathroom, and separate entrance. Most garage conversions in LA take 3-4 months and require replacing the garage door with a framed wall.
Detached New Construction
Building a new standalone ADU from the ground up gives you complete design flexibility but costs more and takes longer. Foundation work, framing, and utility connections add complexity. Expect 5-8 months for a ground-up build.
The ADU Construction Process
- Feasibility assessment — We evaluate your lot, zoning, setbacks, and utility connections
- Architectural plans — Designed to meet local ADU ordinances and maximize livable space
- Permitting — Submitted to your city’s building department (LADBS for LA, or your city’s own department)
- Construction — Foundation/slab, framing, rough-in, insulation, drywall, finishing
- Final inspection & certificate of occupancy — Required before renting or occupying
Choosing an ADU Contractor
Not every general contractor has ADU experience. Look for a contractor who:
- Has completed multiple ADU and garage conversion projects
- Understands local ADU ordinances (they vary by city)
- Handles architectural plans and permitting in-house
- Provides a fixed-price contract, not time-and-materials
- Is licensed, bonded, and insured (verify at cslb.ca.gov)
Planning an ADU or Garage Conversion?
Paradigm Builders handles the entire process — design, permits, and construction. Free property assessment.
