Junior ADU (JADU) in Los Angeles

Junior ADUs (JADUs) are units up to 500 sq ft created within your existing home. Lower cost, simpler permitting, and powerful for rental income.

4.9★Google Reviews
LicensedCA Contractor
200+ADUs Built
15+ YrsIn Business

About Our Team

Specialized Junior ADU Contractors in Los Angeles

We focus exclusively on accessory dwelling units. Since 2009, our team has transformed existing spaces into over 200 custom units, including Junior ADUs.

A Junior ADU requires precise design to maximize functionality within a 500 square foot limit. Instead of adding a new structure, we optimize your existing footprint. General contractors might treat this as a standard remodel, but a JADU has specific permitting and code requirements. We handle the design, city approvals, and construction in-house, delivering a fully compliant and livable space without unnecessary delays.

Learn About Our Team
ADU Build LA Junior ADU builder
ADU Build LA JADU construction specialists

What We Do

ADU Services from a Los Angeles Design-Build Team

From feasibility through final inspection, one ADU builder handles your full scope so timelines and costs stay clear.

ADU Plans & Design

Plan your project with dedicated ADU builders Los Angeles homeowners trust for faster approvals, buildability, and rental value.

01.

ADU Plans & Design

ADU Permits & Approvals

Our team acts as the expert ADU contractor Los Angeles cities work with daily, handling all submissions and correction responses.

02.

ADU Permits & Approvals

Detached ADU Construction

Explore a ground-up detached ADU build as an alternative for maximum privacy, custom layouts, and dedicated space.

03.

Detached ADU Construction

Garage to ADU Conversion

Turn your existing garage footprint into a modern, fully compliant legal rental unit without expanding your home's exterior.

04.

Garage to ADU Conversion

Junior ADU (JADU)

Discover how a Junior ADU can fit seamlessly within your home's existing walls, creating independent living space.

05.

Junior ADU (JADU)

Our JADU Approach

Small Footprint, Real Rental Income, Simpler Permitting

JADUs are appealing because they are lower-cost and faster to permit than a full ADU. However, they have real compliance requirements that catch unprepared contractors. We have built JADUs within bedrooms, bonus rooms, and attached garages, and we know exactly how to hit the 500 square foot ceiling efficiently.

  • Interior space analysis to confirm JADU eligibility before design work
  • Efficient layouts that maximize livability within the 500 square foot cap
  • Simplified permit pathway that is typically faster than full ADU plan check
  • Owner occupancy requirement clearly explained upfront
  • Kitchen and bathroom design within tight spatial constraints
  • All-inclusive pricing covering design, permits, and construction in one contract
200+
ADUs Completed
Including JADUs & conversions
$60K
Starting Price
All-inclusive JADU build
4.9★
Google Rating
From verified homeowners
500
Sq Ft Maximum
CA JADU code limit

JADU Process

Converting Your Existing Rooms into a Junior ADU

We convert your attached garage, basement, or spare bedroom suite into a legal, self-contained living unit within your home's footprint.

01

Zoning Check

We confirm your property's qualification, checking utility lines and ensuring the JADU falls within the 500 square foot limit.

02

Space Planning

We design a layout that maximizes storage and flow, integrating the required independent entrance and kitchenette.

03

Utility Separation

We plan plumbing routes, run dedicated electrical circuits, and set up independent heating and cooling controls.

04

Conversion Build

We frame fire-separation barriers, soundproof shared walls, install kitchen cabinets and appliances, and complete finishes.

Free Estimate

Get a Free Estimate for Junior ADU (JADU)

Tell us about your property and your goals. We'll review your site and provide a detailed cost and timeline estimate at no charge, with no obligation.

  • Property feasibility review at no cost
  • Realistic cost range based on your specific lot
  • Estimated timeline from design through occupancy
  • Response within 1 business day

No spam. No pressure. We serve homeowners across Los Angeles County.

Request Your Free Estimate

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Common Questions

Junior ADU (JADU): Frequently Asked Questions

What Los Angeles homeowners ask most before starting an ADU project.

What exactly is a Junior ADU (JADU)?
A Junior ADU is an ADU created entirely within the walls of an existing single-family home, typically a converted bedroom, bonus room, or attached garage. JADUs are capped at 500 sq ft, must have their own exterior entrance, and require a kitchenette (efficiency kitchen). They are a separate dwelling unit from the primary residence but share the same building envelope.
Does a JADU require owner-occupancy?
California law allows cities to require owner-occupancy as a condition of JADU approval, meaning the property owner must live in either the main house or the JADU. As of 2025, this requirement is still permitted for JADUs (unlike standard ADUs, where it was removed). We confirm your city's current JADU owner-occupancy rules during the free property assessment, as requirements vary by jurisdiction.
What is the maximum size of a JADU?
California state law caps JADUs at 500 sq ft. This is a hard ceiling, there is no variance or exception available. Most effective JADU conversions fall in the 300–500 sq ft range. Within that limit, we design layouts that maximize livability: efficient kitchen placement, a full bathroom, separated sleeping area, and natural light from the existing room's windows.
What kitchen requirements apply to a JADU?
A JADU must include a kitchen facility, but California allows an efficiency kitchen rather than a full kitchen. This means a sink, cooking appliance, and counter surface. A full-size range or dishwasher is not required, which makes the kitchen achievable within a tight footprint. We design JADU kitchens that meet code requirements while making the most of the available space.
Does a JADU need a separate bathroom?
A JADU must provide bathroom facilities. If the JADU has interior access to the main house, it may share the home's existing bathroom, but this is uncommon in practice. Most JADUs we design include a dedicated bathroom within the unit for practical tenant and owner use. A full bathroom adds cost but significantly improves the unit's livability and rental value.
How much does a JADU cost and how long does it take?
JADU projects start from around $60,000 all-inclusive, covering design, permits, and construction. Cost depends on the scope of conversion: an existing bedroom with a new kitchenette and bathroom runs less than a full interior reconfiguration. Permitting for JADUs is typically faster than a full ADU, plan check at LADBS runs 8–12 weeks for a straightforward JADU. Total timeline from design to CO is typically 5–8 months.

Need help planning your ADU project?

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Want to See What Your ADU Could Look Like?

Our interactive configurator lets you choose type, size, finishes, and exterior style, showing you matching floor plans with a live budget estimate.

Plan your ADU

Explore Your JADU Options

Find out if your home qualifies for a Junior ADU.