Assessor Units vs. Permitted Units in Los Angeles: Why the Numbers Don't Match
The LA County Assessor's unit count and the city's permitted unit count frequently disagree because the Assessor updates on a different cycle, relies on owner declarations, and doesn't always capture ADUs, conversions, or recent permits. The permitted record is the more legally authoritative source for how many units a property is entitled to.
Key Takeaways
- Assessor data can lag 1–3 years behind actual permitted changes.
- ADU permits granted since 2017 are often missing from Assessor rolls.
- Buyers relying only on Assessor counts may under- or over-value a property.
- Permit records from LADBS are the ground-truth source for entitled units.
- Zonara cross-references both sources to surface discrepancies automatically.
This article is part of Zonara's LA unit verification series. For the step-by-step checklist (pre-listing or pre-offer), see: How to Verify Permitted Units in Los Angeles.
The Problem: Two Databases, Two Answers
If you pull up a duplex in Silver Lake on the LA County Assessor's site, it might say "2 units." But dig into the LADBS permit history, and you'll find a third unit was permitted via an ADU conversion in 2021. Which number is correct?
Both are "correct" in their own context — the Assessor reflects what's on the tax rolls, while the permit record reflects what the city has authorized to exist. The issue is that most listing platforms, appraisals, and even some title reports only surface the Assessor count.
Why the Gap Exists
The divergence comes down to three things: timing, methodology, and incentives.
Timing. The Assessor updates property characteristics on an annual reassessment cycle, typically triggered by a sale or new construction completion. A permitted ADU that hasn't yet been reassessed simply won't show up.
Methodology. The Assessor relies on a mix of aerial imagery, owner questionnaires, and field inspections. Permits that don't result in visible exterior changes — like an interior garage conversion — can be missed entirely.
Incentives. Property owners sometimes avoid notifying the Assessor of additional units to defer a tax reassessment. The city doesn't proactively reconcile its permit database with the Assessor's rolls.
LADBS permit records are public and searchable at ladbs.org. The LA County Assessor's property data is available at assessor.lacounty.gov. Zonara pulls from both sources and flags discrepancies as a standard part of its property intelligence reports.
What This Means for You
For buyers, the Assessor count might understate what you're buying — or a seller might claim units that were never formally permitted. Either scenario affects value, financing, and insurance.
For investors, the gap is signal. A property with more permitted units than the Assessor shows could be undertaxed today (good) but may face reassessment (plan for it). A property with fewer permitted units than advertised could be carrying unpermitted space — a liability.
For agents, surfacing the correct unit count in a listing or CMA builds credibility. Getting it wrong creates legal exposure.
Example: 1847 N. Hoover St, Los Angeles 90027 Assessor: 2 units | LADBS Permits: 3 units (ADU permit #20016-20000-12345, finaled 2021-09-14) Discrepancy: +1 unit not reflected on Assessor rolls
How Zonara Handles It
Zonara's property reports automatically cross-reference Assessor unit counts with LADBS permit records. When they don't match, the report flags the discrepancy with the specific permit numbers, dates, and a plain-language explanation of the likely cause.
No manual digging. No guessing.
Related: LA Unit Verification Checklist
If you want the practical workflow (what to pull, what to extract first, and listing-safe language), start here: How to Verify Permitted Units in Los Angeles.