Property Owner Resource Guides

Helpful information about ADU legalization, permit research, code violations, as-built plans, and more — for California property owners.

These guides provide general information only. Requirements vary by property, jurisdiction, and project scope.
How to Legalize an Unpermitted ADU

A step-by-step overview of what the ADU legalization process generally involves in California.

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How to Legalize a Garage Conversion in California

General guidance on what legalizing an unpermitted garage conversion typically involves in California.

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How to Legalize an Unpermitted Addition

An overview of what legalizing an unpermitted room addition or home expansion generally involves.

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How to Legalize an Unpermitted Bathroom

What California property owners need to know about legalizing an unpermitted bathroom addition.

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How to Legalize an Unpermitted Bedroom

A guide to understanding what legalizing an unpermitted bedroom addition typically involves in California.

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How to Find Old Building Permits for a California Property

A guide to researching historical building permit records for California residential properties.

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How to Check Whether an ADU Is Permitted

Steps to verify whether an ADU or accessory structure on a California property has the required permits.

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How to Research Property Records in California

An overview of the types of property records useful for understanding a California property's permit and improvement history.

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What Is an As-Built Plan?

An explanation of as-built plans, what they document, and why they are commonly required for legalization projects.

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What Is a Retroactive Building Permit?

An explanation of retroactive building permits and how they work for unpermitted residential structures in California.

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What Happens After a Code Violation Notice?

An overview of the typical sequence of events after a California property owner receives a code violation notice.

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What Happens After a Stop-Work Notice?

Understanding what a stop-work notice means and what California property owners typically need to do in response.

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Can You Sell a Property With Unpermitted Work?

Understanding how unpermitted work affects property sales in California and what options exist for sellers.

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Can You Refinance a House With an Unpermitted ADU?

An overview of how unpermitted ADUs affect refinancing in California and what options property owners have.

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Can You Insure an Unpermitted ADU?

Understanding insurance considerations for unpermitted ADUs and other accessory structures in California.

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Can an Unpermitted Structure Be Grandfathered?

A realistic explanation of what 'grandfathering' means for unpermitted California structures — and common misconceptions.

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Can a Garage Conversion Be Legalized?

Understanding the factors that determine whether a garage conversion can be legalized in California.

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Can a Guest House Be Legalized?

What California property owners should know about legalizing an unpermitted guest house, casita, or backyard cottage.

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What Happens If the City Discovers Unpermitted Work?

An overview of what can happen when a California building department becomes aware of unpermitted work on a property.

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Does Unpermitted Work Affect Property Value?

How unpermitted structures and improvements can affect the market value of California residential properties.

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Does Unpermitted Work Affect a Home Sale?

Understanding the ways unpermitted work can complicate or affect a California home sale.

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How Long Does the Legalization Process Take?

Realistic guidance on timelines for the California legalization process and the factors that affect how long it takes.

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What Documents Are Needed for a Legalization Project?

An overview of the documents commonly needed when pursuing legalization for an unpermitted California structure.

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When Is a Licensed Architect Required?

Understanding when California building departments require plans stamped by a licensed architect.

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When Is a Licensed Engineer Required?

Understanding when structural calculations or other engineering documentation may be required for a legalization project.

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When Is a Licensed Contractor Required?

Understanding when a licensed contractor may be needed as part of a California legalization project.

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Common Reasons Legalization Projects Get Complicated

Understanding the factors most likely to make a California legalization project more challenging or time-consuming.

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ADU Legalization vs. New ADU Permit: What's the Difference?

Understanding the key differences between legalizing an existing unpermitted ADU and getting a permit for new ADU construction.

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Permit Research Checklist for California Property Owners

A useful checklist for property owners conducting permit research before or during a legalization project.

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Code Violation Response Checklist for California Property Owners

A step-by-step checklist to help California property owners respond to a building code violation notice.

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Property Legalization Preparation Checklist

A checklist to help California property owners prepare the information needed to start a legalization project.

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