Does an unpermitted ADU or garage conversion stop a HELOC?
An unpermitted unit rarely blocks the application by itself. It just doesn’t count. The valuation uses the square footage and unit count of record, so a converted garage or backyard unit adds nothing to the number you borrow against. Where it can become a problem is condition: the home must rate at least average, and a conversion done without inspection can be the thing a property condition report flags.
These are the requirements for the home equity line we place. Other lenders set their own guidelines, and some are more flexible.
Los Angeles is the capital of the converted garage. Decades of housing pressure produced hundreds of thousands of units that exist on the ground and not on the county’s records, and the same pattern runs through the older neighborhoods of Orange County, the San Gabriel Valley and the Bay Area. If you bought a house with one, or built one, this page is about what it does to a home equity application — and about a change in state law that makes the fix cheaper than it used to be.
Why it doesn’t add value on the application
The value behind your line is the value of the property as recorded. A 1,400-square-foot house with a 400-square-foot garage conversion is valued as a 1,400-square-foot house with a garage. The rent the unit produces, the money you spent on it, and what a buyer would pay for it are not part of that number.
That is not a lender being difficult. An unpermitted structure can be ordered removed, and a valuation can’t rest on something the county could require you to tear out.
Where it can actually stop you
Two places. First, condition: approval depends on the property being in at least average condition, verified with a property condition report. A conversion done without inspection — exposed wiring, a gas line run by hand, a bedroom with no egress window — is exactly what that report is designed to catch. Second, unit count: a single-family house with a second kitchen can read as a two-unit property, and a duplex with a converted garage can read as a triplex. Each of those changes which rules apply.
AB 2533: the amnesty for units built before 2020
Since January 1, 2025, California law prohibits a city or county from denying a permit for an accessory dwelling unit or junior ADU built before January 1, 2020, solely because it violates building standards or ADU rules — unless the correction is needed to fix a condition that makes the building substandard under Health and Safety Code section 17920.3. Cities also may not charge impact fees, connection charges or capacity charges to legalize such a unit unless it needs new utility connections.
In practice that means a sound pre-2020 conversion can often be permitted without being rebuilt to current code. Once it is permitted, it is square footage of record, and it counts. Health-and-safety items — electrical, gas, egress, structural — still have to be fixed, which is the same list the condition report would flag anyway.
Source: California AB 2533 (2024), as summarized by the City of El Cerrito and the County of Santa Cruz. Checked October 2026. Your city’s building department administers the program locally.
The order of operations
- Pull the county record for your parcel — square footage, bedroom count, unit count. That is what the valuation will use.
- If the unit was built before 2020, ask your city’s building department about an AB 2533 legalization permit before you apply for anything. A permitted unit is worth more to you on the application than an unpermitted one is.
- If it was built after 2020, the amnesty doesn’t apply; a standard ADU permit does, and the city can require it to meet current code.
- Either way, fix the safety items first. They are what the condition report looks for, and they are what the city will require regardless.
Then apply on the house as recorded. If the line funds the legalization work, you are using the equity in the recorded home to make the unrecorded part count.
Think this applies to your property?
Send the details. Matt reviews them and replies himself, even when the answer is no.
Unpermitted ADUs and Conversions: questions
Usually not by itself. The conversion is simply left out of the valuation, which uses the square footage and unit count the county has on record. It can become a problem if the work is in poor enough condition for a property condition report to rate the home below average.
No. The value behind the line is the value of the property as recorded. Rent from the unit and what you spent on it are not part of that number. Once the unit is permitted, it is square footage of record and it counts.
A California law effective January 1, 2025 that prohibits cities and counties from denying a permit for an ADU or junior ADU built before January 1, 2020 solely for violating building standards, unless the correction is needed to fix a substandard condition under Health and Safety Code 17920.3. It also bars impact and connection fees for legalizing such units in most cases.
If it was built before 2020 and is structurally sound, usually yes. A permitted unit counts toward value; an unpermitted one doesn’t. Fix the health-and-safety items first in either case, because both the city and the property condition report will look for them.
These are the requirements for the home equity line we place. Other lenders set their own guidelines, and some are more flexible.
The other main requirements
Credit Score Requirements
On the line we place, 640 is the minimum for a home you live in. Second homes and investment properties need 680, and th…
Learn moreDebt-to-Income Requirements
On the line we place, debt-to-income can be up to 50% of your gross monthly income. Over that, you’re not automatically …
Learn moreEligible Property Types
On the line we place, the home must be an eligible property type — single-family residence, townhome, planned unit devel…
Learn moreFind out where you stand before you apply
Credit, income, property and title each have their own rule. Most declines trace back to one of them, and many can be fixed before you apply.