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ADU Building Permits Cost Guide

A guide for ADU building permits, permit-cost questions, and local plan-check budget planning.

Search signal

Keyword research surfaced ADU building permits, ADU permit, ADU permits, and ADU building permit as high-intent topics. Those searches usually come from buyers trying to understand what the city or county will still require.

Truth boundary

The California Factory Built Housing approval references the factory-built structure package. It does not remove local plan check, site-specific approval, utility review, inspections, or fee questions.

Budget use

Treat permits and local fees as a separate calculator line until the jurisdiction, model, placement, utilities, and inspection path are known.

Calculator use

Permit cost belongs in its own visible line.

Factory approval is not the permit

The CA FBH approval supports factory-built structure review, while local project approval remains separate.

Local review varies

City or county review may involve plan check, inspection sequence, utility coordination, and revisions.

Do not hide fees

Permit and plan-check allowances should stay visible until the jurisdiction and placement are confirmed.

Proof path

Use the approvals page for the factory documents and the calculator for the local permit allowance.

Open calculator Check approval boundary Send packet for review