ADUs in Los Angeles 2025: A Comprehensive Guide

Richard Golding
Sep 28
3 min read

Updated: Oct 8

Introduction to ADUs in Los Angeles

Accessory Dwelling Units (ADUs) are becoming increasingly popular in Los Angeles. From cozy backyard studios in Mar Vista to spacious two-bedroom units in the Valley, ADUs are the go-to solution for multigenerational living and generating rental income. In this article, we will explore the latest changes for 2025 and provide insights on how to design ADUs for high occupancy and minimal maintenance calls. For more information, visit CalHCD.

What’s New for ADUs in 2025 in Los Angeles?

Short answer: The California HCD ADU Handbook was updated in 2025. Additionally, LA Planning issued ZA Memo 143 (Aug 1, 2025), summarizing local standards that align with state law amendments from 2023 to 2025. This streamlining of approvals makes it easier to build ADUs. For further details, check out CalHCD+1.

Key Highlights

Development standards have been clarified to ensure consistency with statewide rules for ADUs and Junior ADUs (JADUs). More information can be found at Los Angeles City Planning.
State updates from 2023 to 2025 have further reduced barriers to ADUs and JADUs. This supports faster and more predictable approval processes. More details are available at California State Assembly.

What ADU Designs Rent Fastest in LA Right Now?

Short answer: The most sought-after designs feature compact luxury, abundant natural light, and sound acoustics. Low-water landscapes and durable finishes are also essential. Studios and one-bedroom units ranging from 400 to 800 sq ft are leasing quickly in various neighborhoods.

Design Details

Daylight and Privacy: Incorporate tall windows with shading and strategically placed frosted glass to maintain privacy while maximizing light.
Sound Control: Use resilient channels, solid-core doors, and mini-split HVAC systems to ensure quiet operation.
Kitchens and Baths: Opt for stone-look porcelain, induction cooktops, and compact appliances (24–30 inches). Curbless showers enhance accessibility and cleanliness.
Landscape: Choose native, drought-tolerant plants and implement smart irrigation systems to keep utility costs low. For more landscaping ideas, visit yardzen.com +1.

Step-by-Step Guide to Building an ADU

Building an ADU can be a complex process, but following these steps can simplify it:

Feasibility Check: Confirm zoning regulations, setbacks, lot coverage, and utility access.
Concept Layout: Aim for a size between 400 and 800 sq ft. Prioritize storage, natural light, and cross-ventilation in your design.
Code and Submittal: Ensure your plans align with ZA Memo 143 and state ADU standards. Submit your plans to the Los Angeles Department of Building and Safety (LADBS). More information can be found at Los Angeles City Planning.
Selections: Choose durable flooring, porcelain slabs, induction cooktops, and ENERGY STAR-rated appliances for energy efficiency.
Site Work: Plan for trenching, drainage, and permeable hardscaping to manage runoff effectively.
Build and Inspect: Coordinate the sequence of rough trades and prepare for HERS testing if required.
Turnover: Seal all surfaces, provide a maintenance guide, and prepare lease agreements and house rules.

Frequently Asked Questions (FAQ)

How long does ADU permitting take in LA?

The duration varies based on the scope of the project and current workload. Updated guidance aims to keep reviews consistent with state timelines. More details can be found at Los Angeles City Planning.

Do I need parking for an ADU?

State rules provide broad parking exemptions for ADUs located near transit and in many other scenarios. Check the current local interpretation during your submittal process at CalHCD.

What size is ideal for rentals?

Studios and one-bedroom units between 400 and 800 sq ft are versatile and cost-efficient to operate.

What landscape works best?

Opt for native and climate-appropriate plants, complemented by drip irrigation and smart controllers. For more landscaping options, visit yardzen.com +1.

Author Bio & Expertise

Written by Richard Golding, a contributor for California Construction & Remodeling Experts. Richard specializes in durable, energy-efficient construction. California Construction & Remodeling Experts designs and builds ADUs throughout Los Angeles.

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