Trusted ADU Design & Permitting for Los Angeles Homeowners
Los Angeles ADU Design & Permitting typically takes 4 to 9 months from first site assessment to an issued building permit, and the full design-permitting phase costs $18,000 to $42,000 depending on site conditions, zoning overlays, and whether you need a variance. That’s the number most homeowners ask for first, and it’s the number we put in writing before any work begins. Since 2015, Ellery ADU Studio has designed, permitted, and built more than 900 ADUs across Los Angeles, from Jefferson Park bungalow conversions to hillside detached units in Mount Washington. If you’re weighing an ADU on a Los Angeles property and want a documented permit set, a written scope, and one contract that covers drawings through final inspection, call Nadia Ellery’s team at (971) 497-2402.
What Our ADU Design & Permitting Service Includes
Every project starts the same way: we document what exists, we check what the city will actually allow, and we price the work in writing. No verbal estimates, no “call for a quote.” Under Haven Standard Clause 1, you receive a written price before any work begins. Here’s what the service covers, in order.
Site Assessment
A site assessment answers the question every ADU Design & Permitting - Huntington Park and Los Angeles homeowner asks: can I even build an ADU here? We measure the existing structures, check the slope and drainage patterns, locate the sewer lateral, and photograph the entire site so the record matches the drawings. In hillside neighborhoods like Echo Park and Silver Lake, we regularly find retaining walls or grading issues that affect both the foundation cost and the permit path. The assessment produces a written findings report, not a verbal summary, and it becomes the first page of your permit file.
ADU Design & Blueprints
This is where the ADU becomes a buildable structure. We produce architectural drawings, structural engineering, and the full permit set the Los Angeles Department of Building and Safety (LADBS) will actually review. For a new detached ADU in the San Fernando Valley, that means floor plans, elevations, foundation details, and a site plan showing setbacks from every property line. For a garage conversion in Leimert Park, it means documenting the existing slab thickness and roof structure before we draw a single wall. Every drawing set is prepared by our in-house design team and checked by a California-licensed engineer before submission.
Permit Application
Filing the permit is where most projects stall, and it’s the part we treat as the core product. We prepare the application package, submit it to LADBS, and track it through plan check, responding to reviewer comments in writing and resubmitting corrected sheets. Los Angeles plan check times vary by district office and by project complexity; a straightforward garage conversion may clear in 6 to 10 weeks, while a hillside new build with a geotech report can take 16 to 20. You’ll know which path you’re on before we file, because we tell you in the written scope.
HOA & Zoning Compliance
State law says cities must approve most ADUs, but HOAs can still impose their own rules on aesthetics, parking, and even rental restrictions. If you live in a planned development in Porter Ranch, Playa Vista, or any HOA-governed community in ADU Design & Permitting - South Gate or Los Angeles, we review your CC&Rs before we finalize the drawings, and we flag any conflict in writing. Zoning is its own layer: height limits, lot coverage, daylight planes, and historic overlay rules in places like Hancock Park or Angelino Heights change what you can build. We check all of it up front, so the permit set we submit is one the city can approve without a redesign.
Title 24 Energy Compliance
Every new ADU in Los Angeles must meet California’s Title 24 energy code, which covers insulation, window performance, HVAC efficiency, and lighting. We run the Title 24 compliance model in-house and include the certificate in your permit package, so the city and the utility both have the documentation they need. For homeowners adding a second unit with its own meter, the energy calculation also informs decisions about panel capacity and appliance selection. This is the line item that surprises people when it’s missing from a cheaper design package; it’s never missing from ours.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Brands We Service for ADU Design & Permitting
We’ve specified and coordinated prefab and modular systems from Abodu, Cover, and Dvele on Los Angeles projects where factory construction made more sense than stick-framing on a tight urban lot. With Abodu, that typically means a detached unit delivered on a steel chassis, which changes both the foundation scope and the permitting conversation with LADBS. With Dvele, we’re working with panelized wall and roof systems that arrive in sections and go up faster than conventional framing, but require stricter site logistics planning.
We also work with James Hardie siding and trim details on nearly every project, because Los Angeles fire zones and HOA design standards often require non-combustible cladding. Whatever system you’re considering, whether it’s a Cover unit or a conventional build, we handle the design, the permit set, and the construction under one contract. If you’re comparing prefab brands and have a written estimate from any of them, bring it in; we’ll review it under our Free Second Opinion policy.
Signs You Need ADU Design & Permitting Right Now
- Your contractor gave you a price without a permit path. A builder who says “we’ll figure out permits later” is pricing a structure the city hasn’t reviewed. In Los Angeles, unpermitted ADUs don’t appraise, don’t qualify for financing, and can trigger enforcement if a neighbor files a complaint. Get the permit set first, then build.
- You’ve been told your lot “can’t” have an ADU. Since 2017, state law has stripped Los Angeles of most of its power to deny ADUs on single-family lots. If someone told you no, you haven’t seen the full picture yet. We’ve permitted units on lots where the first three consultants said it couldn’t be done.
- Your existing garage is one good shake away from a problem. In older Los Angeles neighborhoods like West Adams and Highland Park, garage slabs are often 3 to 4 inches thick with no rebar. That might work for a car, but it’s not a foundation for living space. We document what’s actually there before you spend money on the wrong conversion approach.
- You’re already paying for a mortgage and the ADU rent would change the math. A permitted one-bedroom ADU in Los Angeles rents for $1,800 to $2,600 a month depending on the neighborhood. If you’re in a high-rent corridor, every month the ADU isn’t permitted is income you’re not collecting. The permitting timeline is the financial bottleneck, and it should start now.
- You have a written estimate from another designer and it feels incomplete. No structural engineering, no Title 24 certificate, no HOA review, no plan check response included. That’s not a permit set; it’s a partial drawing package. Bring it in. Under our Free Second Opinion policy, we’ll tell you exactly what’s missing and what it will cost to finish.
Our ADU Design & Permitting Process - Step by Step
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Site walk and documentation. We measure, photograph, and record the existing conditions. In Los Angeles, that includes the setback distances, the sewer lateral location, the slope, and any trees that might trigger a protected tree review. You receive a documented photo record of every visit, per Haven Standard Clause 4.
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Written scope and price. Before we draw anything, you receive a written scope of work with a line-item price. That price covers design, engineering, permit application, plan check response, and the construction itself. It does not change at the door, because Haven Standard Clause 5 locks the scope at signing.
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Design and engineering. We produce the full permit set, including structural calculations and the Title 24 energy certificate. If you’re considering a prefab system from Abodu, Cover, or Dvele, this is the phase where we coordinate their shop drawings with our site plan so the city sees one cohesive submission.
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Permit application and plan check. We file with LADBS, track the review, and respond to every reviewer comment in writing. Plan check is where permits live or die; we’ve cleared more than 900 of them since 2015, and we know what each district office flags. You get updates as they happen, not a check-in call once a month.
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Issued permit, then construction. Once the permit is issued, we build under the same contract. The drawings govern the work, and the 365-Day Done Right Promise governs the outcome: if the finished ADU is not built to the permitted drawings, we make it right in writing. You get a documented photo record at completion, matching the record we started on day one.
How Much Does ADU Design & Permitting Cost in Los Angeles?
A typical garage conversion ADU in Los Angeles runs $140,000 to $190,000 all-in, drawings through final inspection. A new detached one-bedroom ADU in a flat-lot neighborhood like Mar Vista or Culver City runs $220,000 to $290,000. A two-story hillside unit in Mount Washington or Echo Park can run $320,000 to $420,000, because the foundation, the grading, and the retaining wall all line up on the expensive side of the ledger. Design and permitting alone, as a stand-alone service, runs $18,000 to $42,000 depending on whether you need a variance, a geotech report, or a structural upgrade to an existing garage.
What changes the price: slope and soil conditions, the age and condition of your existing structures, the HOA’s design requirements, and whether you’re converting or building new. What doesn’t change the price, once we sign: the scope. You’ll know every line item before work starts, and you’ll get a written change order for anything that genuinely can’t be anticipated, like a sewer line that turns out to be broken under the slab. A free estimate from us includes the site assessment report, so you leave the first conversation with more than a verbal ballpark. Call (971) 497-2402 to schedule yours.
ADU Design & Permitting Near Los Angeles - Our Service Area
We work across Los Angeles County, from San Pedro to Sherman Oaks, from Westchester to Eagle Rock. We also serve homeowners in nearby markets including San Diego, San Jose, San Francisco, Fresno, and Sacramento, and we maintain full design-permitting capability in Houston and San Antonio through our ADU Design & Permitting in Houston and ADU Design & Permitting in San Antonio practices. If you’re in Los Angeles proper, a site assessment is typically scheduled within five business days. Our home page covers the full service list if you want to see how this fits with our other work.
Serving Los Angeles, CA - Our Local Coverage Area
We’re based in the Los Angeles area and know this community well, including ADU Design & Permitting in Bell. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - ADU Design & Permitting in Los Angeles
ADU design and permitting is the full process of creating architectural drawings, structural engineering, and the permit package that the Los Angeles Department of Building and Safety requires before construction can legally begin. At Ellery ADU Studio, it includes site assessment, design, Title 24 energy compliance, HOA and zoning review, permit application, and plan check response. The deliverable is an issued building permit and a drawing set that governs the construction that follows.
Most projects take 4 to 9 months from first site assessment to an issued permit. A simple garage conversion in a flat-lot neighborhood can clear in as little as 4 months; a hillside new build with a geotech report and a variance can take 9 or more. The single biggest variable is LADBS plan check time at your district office. We tell you the realistic timeline in writing before we file, based on the district and the project type.
Design and permitting as a standalone service runs $18,000 to $42,000. When it’s part of a full design-build contract, the total for a garage conversion runs $140,000 to $190,000, and a new detached ADU runs $220,000 to $290,000 on a flat lot. Those are all-in numbers, from drawings through final inspection, with no change orders on the design scope. Call (971) 497-2402 for a written price on your specific property; the estimate is free and includes the site assessment.
Yes. We specify and coordinate systems from Abodu, Cover, and Dvele within the same single contract. When you bring us a prefab system, we handle the site work, the foundation, the utility connections, and the permit package as a combined scope. The prefab shop drawings become part of our permit set, and the construction is covered by the same 365-Day Done Right Promise.
No. Permitting in Los Angeles has a statutory review process, and nobody can rush LADBS. What we do offer is a live person who answers the phone 24/7, so when you have a question about your permit status or a plan check comment, you can reach a human being, not a voicemail queue. If you’re in a genuine time crunch because a contractor failed to pull permits, call (971) 497-2402 and we’ll tell you honestly what’s fixable and what isn’t.
The 365-Day Done Right Promise states that if the finished ADU is not built to the permitted drawings, we make it right in writing. That promise is part of The Haven Standard and it’s on the contract before the project starts, not after. Every visit also includes a documented photo record, so the warranty claim process starts with evidence, not a debate about what was said.
Bring any existing property survey, any HOA documents if you have them, and any written estimate you’ve already received from another designer or builder. If you don’t have a survey, we’ll handle it. The first meeting includes a site assessment and a written findings report, so you’ll walk away with a record of what we found and what we recommend, whether or not you hire us. Call (971) 497-2402 to schedule the consultation and the free estimate.
Schedule Your ADU Design & Permitting Service in Los Angeles Today
Call (971) 497-2402 to schedule a free site assessment and written estimate for your Los Angeles ADU. You’ll speak with a live person, not a callback queue, and you’ll receive a written price before any work begins, per Haven Standard Clause 1. That price covers design, permitting, and construction under one contract, with a documented photo record on every visit and the 365-Day Done Right Promise in writing. The estimate costs you nothing, and the site assessment findings are yours to keep either way.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Los Angeles since 2015.