Permit Costs

ADU / Garage Conversion Permit Costs in Los Angeles

How much does an ADU permit cost in Los Angeles? Fees, impact exemptions, and what to budget.

Los Angeles ADU Permit Costs Overview

ADU and garage conversion permits in Los Angeles involve multiple permit types and fee categories. Understanding the full cost of permitting your ADU project in advance helps with accurate budgeting and avoids financial surprises mid-project.

Types of Permits Required for a Los Angeles ADU

A complete Los Angeles ADU project typically requires permits in several categories, each with its own fee:

• Building permit (structural and architectural work)
• Electrical permit (service, panels, circuits, and outlets)
• Plumbing permit (fixtures, drainage, and water supply)
• Mechanical permit (HVAC if a new heating/cooling system is installed)

Impact Fee Exemptions for Los Angeles ADUs

One of the most significant financial advantages of ADUs in Los Angeles is the impact fee exemption for units under 750 square feet. Local development impact fees — which can total tens of thousands of dollars for new construction — are waived entirely for ADUs smaller than 750 square feet under California state law. ADUs of 750 square feet or larger pay proportionate fees based on the size of the ADU relative to the main dwelling.

School District Fees

School districts may assess school impact fees on ADUs larger than 500 square feet. These fees are collected by the school district directly — not by LADBS — and vary by district. Confirm school fee requirements with the applicable district (LAUSD or local unified district) before finalizing your project budget.

Cost Savings from the LADBS Standard Plan Program

Using a pre-approved design from the LADBS Standard Plan Program can reduce plan check fees and overall project costs. Standard plans have already undergone full building code review, so LADBS charges lower review fees for site-specific plan check rather than a full design review. The reduced review time also lowers carrying costs during the permit approval period.

Factors That Affect Total Los Angeles ADU Permit Costs

• ADU size — larger units have higher valuation and higher permit fees
• Whether the project uses a Standard Plan or custom architectural plans
• Number of permits required (building, electrical, plumbing, mechanical)
• Scope of structural modifications to the existing garage
• Number of LADBS inspections required
• School district fees (if ADU exceeds 500 sq ft)
• Sewer connection and sanitation fees if a new connection is required

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