ADU & JADU

We provide complete ADU drafting and documentation services for homeowners, investors, and contractors throughout Los Angeles County. From existing condition documentation to full LADBS permit submittal — our team produces accurate, permit-ready ADU drawing sets for detached units, attached units, JADUs, and garage conversions. AutoCAD and Revit plan sets delivered fast. Free consultation.

Detached ADU

Standalone backyard units — the most popular ADU type in LA

A detached ADU is a standalone structure built in the backyard or side yard of an existing property — completely separate from the main home. It has its own foundation, walls, roof, and all utilities. Detached ADUs offer maximum privacy for both the primary resident and the ADU occupant and are the most popular ADU type in Los Angeles. LADBS requires accurate as-built drawings of the existing main structure, a complete site plan showing setbacks and lot coverage, and a full proposed drawing set for the new detached unit before any permit application is accepted. We field-measure the existing property and produce every sheet required — from site plan and floor plans to elevations, sections, foundation, Title 24, electrical, mechanical, and plumbing.

Attached ADU

Space-efficient additions connected to your existing home

An attached ADU shares one or more walls with the primary residence but has its own separate entrance, kitchen, bathroom, and living space. It is physically connected to the main home but functionally independent. Attached ADUs are a cost-effective option for properties where backyard space is limited.

Attached ADU permit applications require documentation of both the existing home and the proposed addition — showing how the new unit connects to the main structure, shares or separates utilities, and complies with current LADBS setback and lot coverage requirements. We produce complete attached ADU drawing sets covering all required sheets for LADBS submittal.

Garage Conversion ADU

Convert your existing garage into permitted living space

A garage conversion ADU transforms an attached or detached garage into habitable living space. Los Angeles regulations allow garage conversions without requiring replacement parking in most cases — making it one of the most affordable ADU options available.

Garage conversion permit sets require existing as-built drawings of the garage structure — foundation, framing, existing openings — plus proposed drawings showing the new floor plan, insulation, egress windows, bathroom and kitchen rough-ins, electrical, and utility connections. We document the existing garage conditions and produce a complete conversion permit set ready for LADBS review.

ADU vs JADU vs Garage Conversion — Which Is Right for You?

	Detached ADU	Attached ADU	Garage conversion	JADU
Location	Backyard or side yard — fully standalone structure	Connected to main home, shared wall	Existing garage structure on property	Inside main home footprint
Max size	1,200 sq ft	1,200 sq ft	Existing garage size	500 sq ft
Entrance	✓ Separate entrance	✓ Separate entrance	✓ Separate entrance	✓ Required by CA law
Kitchen	Full kitchen	Full kitchen	Full kitchen	Efficiency kitchen only
Replacement parking	Not required	Not required	Not required	Not required
LADBS permit	✓ Required	✓ Required	✓ Required	✓ Required
Best for	Maximum privacy and rental income	Limited backyard or side yard space	Most affordable ADU option	Quick interior conversion
Drawings needed	Site plan, floor plans, elevations, structural notes, Title 24, MEP	Existing + proposed plans, elevations, structural notes, Title 24, MEP	Existing garage as-built, proposed conversion plans, MEP	Existing floor plan, proposed layout, MEP

All ADU and JADU permit drawing sets produced by Lefranc Design are formatted to current LADBS standards and ready for direct permit submittal.

What's Included in Every ADU Drawing Set?

Every ADU permit application submitted to LADBS requires a complete drawing set. Lefranc Design produces all required sheets:

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