Are Building Permits Public Record in LA County? How to Look Them Up

Yes, Permits Are Public — But Know Your Jurisdiction First

Imagine finding the perfect Altadena property, only to discover mid-escrow that the converted garage was never permitted. The short answer to whether you can check is yes — building permits are publicly accessible records — but exactly where you look depends on which government actually issued them.

The City of Los Angeles makes this easy to verify. The Los Angeles Department of Building and Safety explicitly offers public tools to research permits, site plans, and related documents, and even lists "purchasing a property, to know what permits have been issued" as an official use case for records requests. The City also publishes its permit data as an open dataset — a 54-column database with roughly 14K downloads — that anyone can search by Assessor's Parcel Number.

Here's the catch that matters for our readers: every confirmed lookup pathway covers the City of LA only, not all of LA County. The open data portal itself notes this limitation. Altadena sits in unincorporated LA County, which means LADBS tools like PRISM don't apply to your property. We won't pretend to know a county process we haven't verified — the honest guidance is to confirm the lookup procedure directly with the county permitting authority before relying on any online search.

Why does this diligence matter so much?

• Liability follows the property, not the person who did the unpermitted work — it transfers to each new owner, according to permit-history research.
• Garage conversions, added bathrooms, and electrical upgrades are among the most common unpermitted improvements — exactly the projects ADU and conversion buyers should scrutinize.
• Title insurance and standard inspections generally don't reveal permit issues; only a municipal records search does.

For City of LA transactions, sellers must deliver a Residential Property Report — $70.85, valid six months, with no waivers accepted under L.A.M.C. Section 96.300. Altadena homeowners planning an ADU should apply the same standard to their own projects: require proof of final inspection and permit closure before releasing a builder's final payment, a practice real estate attorneys recommend to their clients.

If you're weighing a garage conversion or backyard ADU in Altadena and want a clear-eyed read on permits and costs before you commit, Altadena ADU Builder offers a free ADU feasibility consultation — including a cost-quiz concept render — to help you start on solid, permitted ground.

How to Look Up Permit Records: The Official Pathways

Knowing a permit exists is one thing — pulling the actual record is where your research pays off. The Los Angeles Department of Building and Safety (LADBS) offers several official pathways to search permits and records, and each serves a slightly different purpose depending on how deep you need to go.

The fastest starting point is PRISM, LADBS's new Permit & Records Information Search Module, which the department describes as its platform for accessing building permit and records information at prism.dbs.lacity.gov. LADBS recommends PRISM when you already know which records you need — ideal for a quick check on whether a specific permit was issued for a property.

When you need copies of actual documents — site plans, inspection records, code enforcement files, or even blueprints — you move to the second pathway: the Records Research Request Form. According to LADBS, the Records Section provides copies of construction, permitting, inspection, and code enforcement documents, submitted by email or by appointment. This is the route for homeowners who want the full paper trail, not just a summary line item.

For data-minded researchers, the City's open data portal publishes a permit dataset supplied by LADBS with 54 columns of permit data. It's searchable by Assessor Book/Page/Parcel (APN) or by Tract/Block/Lot legal description, and it connects to Excel or Tableau via OData — a genuine power-user option. Two caveats from the dataset page itself: it covers the City of LA only, not all of LA County, and it was last updated May 22, 2023, so recent permits may be missing.

Before you start searching, gather what you'll need:

• The property address as it appears in official records
• The APN (Assessor's Parcel Number), which unlocks the open-dataset search
• The legal description (Tract/Block/Lot) as an alternative to the APN
• A sense of what you're looking for — a permit number, if you have one, speeds up PRISM considerably

One important note for Altadena readers: LADBS jurisdiction covers the City of Los Angeles. Altadena sits in unincorporated LA County, which has its own permitting authority, so these City-specific tools won't cover your property — we flag that gap honestly rather than guessing at county procedures. Still, the workflow is instructive, and LADBS itself lists "purchasing a property, to know what permits have been issued" as a standard use case for records requests. If you're planning an ADU and want help confirming what's on record for your Altadena lot, Altadena ADU Builder offers a free ADU feasibility consultation — a practical first step before you commit to a garage conversion or new backyard unit.

Why Permit History Matters: Unpermitted Work Follows the Property

A beautiful garage conversion or finished addition can add real value to a home — until someone pulls the permit history and finds nothing on file. That moment of discovery can unravel a routine sale, and the consequences don't fall on whoever did the work. They fall on you.

The core principle is simple but often misunderstood: liability for unpermitted work follows the property, not the person. Each successive owner inherits the risk, according to research on unpermitted work. If a previous owner converted a garage without permits, that liability transfers to you the day you take title.

What makes this especially dangerous is that your usual safety nets don't catch it. Title insurance generally does not cover unpermitted work, and standard home inspections and title searches don't surface permit gaps either. A municipal permit search is what reveals unpermitted work and open permits — which is why permit history is considered the most reliable due-diligence step: compare what's physically on the property against what's on record with the local jurisdiction.

The stakes extend beyond resale:

• Unpermitted square footage typically can't be counted in appraisals, which affects lender financing — and FHA/VA loans may carry stricter requirements.
• Insurers may exclude unpermitted areas from homeowner's coverage.
• Garage conversions, added bathrooms, electrical panel upgrades, and HVAC replacements rank among the most common unpermitted projects.
• Open permits often linger because a contractor never called for final inspection — one reason experts advise requiring proof of permit closure before making a final payment to your builder.

For anyone considering a garage-conversion ADU in Altadena, that last point hits close to home: the very project type you're planning is one of the most frequently done without permits. Building it right the first time — with permitted, inspected work — protects both your investment and any future sale. At Altadena ADU Builder, our feasibility consultations emphasize permitted, code-compliant approaches from day one, and featured builder JMB Builders LLC (CSLB #1103479) documents its work across its service areas.

In the City of Los Angeles, this risk is formalized in the sales process. Under Section 96.300 L.A.M.C., sellers must obtain a Report of Residential Property Records and Pending Special Assessment Liens — the Residential Property Report — and deliver it to the buyer before entering a sale agreement or close of escrow. The fee is $70.85 per report, the report is valid for six months, and no signed waiver or other document can substitute for the city-issued report. LADBS itself lists "purchasing a property, to know what permits have been issued" as an official reason to request records.

One important caveat for Altadena readers: these requirements and lookup tools apply to City of LA jurisdiction. Altadena sits in unincorporated LA County, which is served by a separate permitting authority — verify the exact county process directly rather than assuming the city rules apply.

Using Permit Records to Vet Your ADU Project and Builder

Knowing how to pull permit records is one thing — putting that knowledge to work before you sign a builder contract is where it protects your investment. A converted garage that looks like a great addition "until someone pulls the permit history and finds nothing" can unravel a home sale quickly, as permit researchers warn.

Start with your own property. Before planning a garage conversion or ADU, compare what's physically on your lot against what's on record with the local jurisdiction. Garage conversions, added bathrooms, and electrical panel upgrades are among the most common examples of unpermitted work, and liability follows the property, not the person who did the work — it transfers to you as the owner.

Next, protect yourself during the build. Open permits often linger because a contractor never called for the final inspection, so real estate attorneys advise requiring proof of final inspection and permit closure before releasing your final payment. Title insurance generally won't cover unpermitted work, and unpermitted square footage typically can't be counted in appraisals, which can affect financing when you eventually sell.

Your pre-project vetting checklist should cover three things:

• Pull your property's permit history and confirm every existing structure is documented and closed out
• Verify your contractor holds an active CSLB license before signing anything
• Withhold the final invoice payment until you have proof of final inspection and permit closure

One caveat for Altadena homeowners: the lookup tools documented here, including LADBS's PRISM platform and the City's open permit dataset, cover the City of Los Angeles only, not all of LA County — and Altadena sits in unincorporated LA County. Confirm the correct county permitting authority for your address before relying on any City-specific search.

Altadena ADU Builder helps local homeowners work through exactly these questions — permit history, feasibility, and builder vetting — as part of a free ADU feasibility consultation that includes a cost-quiz concept render tailored to your property. If you're weighing a builder, JMB Builders LLC (CSLB #1103479), an Altadena-based licensed general contractor featured on this site, builds custom homes, ADUs, and whole-home remodels, including Eaton Fire rebuilds.