Professional permit management that saves you time, money, and stress. Approval Guaranteed.
Legal ADU building permits for an unpermitted ADU in Los Angeles
Turn an illegal ADU into a legal ADU with a retroactive permit. LADU specializes in permitting unpermitted ADUs in Los Angeles, delivering safe, rentable units with clear approvals.
Our team expertly navigates California ADU law so your property can move forward with confidence.
Legalize your unpermitted ADU with confidence
An unpermitted ADU can lead to headaches. LADU's architect-led team handles the full path to a legal ADU, including code analysis, drawings, LADBS plan check, and multi-agency reviews, so your unit passes inspections and qualifies for a certificate of occupancy.
We speak the language of ADU building permits in Los Angeles and guide your case from first scan to final sign-off.
- Safer construction for you and your tenants
- Real property value backed by a legal ADU
- Rental income options with fewer headaches
Protect property and income with an ADU permit
California rules govern ADU rental legality across Los Angeles. Final inspection and occupancy sign-off open the door to approved rental listings, standard leases, and long-term stability with lenders and insurers. Simply put, a legal ADU gives you a durable asset.
Avoid costly enforcement with an ADU building permit
Voluntary legalization limits penalties and reduces correction work. LADU identifies violations early, designs the least invasive fixes that meet code, and organizes plan check steps under an ADU building permit to help you reach approval faster.
Why permitting an unpermitted ADU is important
An unpermitted ADU in California can lead to citations, fines, forced removal, buyer concerns, insurance denials, and blocked refinancing. Legal ADU status and a certificate of occupancy protect your rental income and support long-term property value under ADU California law. If you have an ADU without permit approval, quick action helps reduce risk and cost.
Protect property and income with an ADU permit
California rules govern ADU rental legality across Los Angeles. Final inspection and occupancy sign-off open the door to approved rental listings, standard leases, and long-term stability with lenders and insurers. Simply put, a legal ADU gives you a durable asset.
Avoid costly enforcement with an ADU building permit
Voluntary legalization limits penalties and reduces correction work. LADU identifies violations early, designs the least invasive fixes that meet code, and organizes plan check steps under an ADU building permit to help you reach approval faster.
Without legalization
What you risk without a permit path
- × Citations and escalating fines
- × Forced removal or demolition orders
- × Buyer concerns, inspection gaps, and stalled sales
- × Insurance denials on unpermitted work
- × Blocked refinancing and title complications
- × Years of legal and financial exposure
With LADU
Voluntary legalization with LADU
- Voluntary legalization limits penalties and reduces correction scope
- Early violation identification and least-invasive code-compliant fixes
- Plan check organized under a retroactive ADU building permit
- Architect-led drawings, LADBS plan check, and multi-agency reviews
- Structured path to inspections and certificate of occupancy
- A durable, insurable, refinanceable asset under California ADU law
How AB2533 makes permitting an unpermitted ADU easier
Assembly Bill 2533 eases the path to permitting unpermitted ADUs in Los Angeles by requiring local agencies to prioritize compliance over punishment. The law restricts cities from imposing excessive fees or demanding unnecessary upgrades unrelated to health and safety.
Instead, homeowners are given a structured process to remedy code issues, such as fire safety, electrical, or structural concerns, without risking demolition orders. This makes legalization more practical, affordable, and predictable for property owners.
Retroactive permit for an illegal ADU: Your Path to ADU Legalization
Wondering how to get an ADU permit? Here is the typical path for permitting unpermitted ADUs through the Los Angeles Department of Building and Safety and City Planning reviews.
Retroactive permit feasibility & code scan
- Zoning and land use review under California ADU law
- Setbacks, lot coverage, height, and fire access
- Parking rules and exemptions near transit
- Utility easements and site constraints
- Eligibility for ADU vs. JADU on a typical LA lot
- This scan flags nonconformities to correct before filing
As-built documentation for the ADU
- Field measurements, as-built drawings, floor plans, and elevations
- Structural notes and MEP (mechanical, electrical, plumbing) scope
- Title 24 energy compliance and CALGreen measures
- Stair geometry and guardrails
- Emergency egress and window size
- Fire separation from the main house or garage
- Smoke and carbon monoxide alarms
- GFCI and AFCI protection
Multi-agency plan check for ADU permits
- LADBS: Building, Structural, Electrical, Mechanical, Plumbing
- City Planning: Zoning and use compliance
- Fire Department: Fire apparatus access and separation
- Sanitation: Sewer capacity and connection
- Los Angeles Department of Water and Power: Power and water service
- Utility easements and right-of-way sign-offs
- Digital submittals via ePlanLA (City of LA) or EPIC-LA (unincorporated)
Retroactive permits & ADU permit fees
- Plan check, permit issuance, and inspection fees scoped before submission
- School fees when triggered by added area
- Foundation or framing upgrades (when required by scope)
- Electrical service load increases (when required)
- Sewer upgrades and cleanout locations (when required)
- Water service and backflow devices (when required)
Timeline, inspections & legalization
- Plan check often runs 3–6 months depending on corrections and agency clearances
- Complex structural work or hillside conditions can add time
- We coordinate inspections through final sign-off and legalization
Schedule a free site visit to get started
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
Multi-agency plan check for ADU permits
Your plans route through the agencies that govern ADU permits in California. Digital submittals go through ePlanLA for the City of Los Angeles; projects in unincorporated areas use EPIC-LA. Hillside or liquefaction sites may need soil and structural reports. We handle every submittal, correction, and clearance.
Building, structural & MEP
Building, structural, electrical, mechanical, and plumbing plan check for your retroactive ADU permit.
Zoning & use compliance
City Planning review for zoning, use, and ADU rules on your lot.
Access & separation
Fire apparatus access, separations, and related life-safety items.
Sewer capacity & connection
Sewer capacity, connection requirements, and sanitation clearances.
Power & water service
Will-serve letters, panel capacity, water service, and related utility requirements.
Easements & right-of-way
Utility easements and right-of-way sign-offs when your site needs them.
Why choose LADU for ADU permits
LADU is your architecture-led ADU expert in LA. We manage design and permitting under one roof and arrange construction with licensed ADU partners for any required corrections. From code assessment through permit issuance and final sign-off, we'll be here for you.
Our service focuses on speed, clarity, and compliance for ADU building permits
Flat-fee design
Transparent scope — flat-fee design with no surprise change orders on our work.
Code analysis & feasibility
Detailed code analysis and feasibility mapping before we file.
Permit roadmaps & milestones
Clear permit roadmaps and milestone tracking so you always know what's next.
LADBS & partner agencies
Direct coordination with LADBS and partner agencies on corrections and clearances.
Proactive correction lists
Proactive correction lists to reduce plan-check cycles and rework.
Through certificate of occupancy
Management through final inspection and certificate of occupancy.
This approach supports faster approvals, reliable pricing, and a smoother path to a legal ADU. Need more reasons to choose LADU?
- Architect-led ADU design and permitting
- Flat-fee design with no surprise change orders
- Local code fluency across Los Angeles jurisdictions
- ePlan submittals, corrections, and resubmittals handled
- Construction arranged through vetted licensed partners
- Turnkey support from feasibility to inspection
Schedule a free site visit to get started
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
Timeline and Inspections for ADU Legalization
For unpermitted ADU California cases, plan check often runs 3–6 months depending on corrections and agency clearances. Complex structural work or hillside conditions can add time.
Frequently asked questions
Answers for homeowners legalizing an unpermitted ADU in Los Angeles. If yours is not covered here, our team replies within 24 hours.
For unpermitted units, plan check often runs 3–6 months based on corrections and agency reviews. Complex sites or structural retrofits can add time. LADU cuts cycles by submitting complete drawings, responding fast to comments, and coordinating clearances early.
A licensed engineer on your lot, free.
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
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Explore all of our services.
One accountable team for every step of your ADU project — from initial sketches and city permits to financing, construction, and legalization.
ADU Design
Our ADU design team works closely with each client to create adaptable layouts that fit your site, lifestyle, and goals.
Learn more →ADU Building Permits
We manage every ADU building permit, drawing, document, and approval with your city and county — start to finish.
Learn more →Legalizing Unpermitted ADUs
We help you navigate the legalization process for your existing ADU, ensuring compliance and securing permits.
Learn more →ADU Construction
We oversee the full construction process with care, skill, and clear communication, turning your plan into a beautiful ADU.
Learn more →Modular ADUs
Save money and build faster with a modular ADU. Factory-built, site-installed, and ready in months — not years.
Learn more →ADU Financing
We work with multiple ADU-specific lenders so you can find the right financing — HEA, HEI, HELOC, or construction-to-perm.
Learn more →