One team designs and engineers your entire ADU plan set, formatted for LADBS approval. Flat price up front, free corrections until your permit is issued. Permit-ready in 2–4 weeks.
Free feasibility check included. No obligation, no hourly billing.
Every ADU plan set includes architectural drawings, structural engineering, and Title 24 energy calculations, everything LADBS needs to issue your permit, from one team.
New backyard homes up to 1,200 sq ft, full architectural, structural, Title 24, and MEP set.
From $4,950The fastest, most affordable ADU in LA. Plans, structural check, and energy compliance for converting your existing garage.
From $2,450Junior ADUs up to 500 sq ft carved out of your existing home, an efficient way to add a rental unit.
From $2,450ADUs attached to the main house, over-garage units, and room additions with full structural design.
From $3,450As-built drawings plus the structural analysis LA requires to bring existing unpermitted units up to code.
Flat-fee proposalADU builders and GCs: we produce plan sets under your brand for your clients, at volume.
Custom quoteLA layers its own ADU ordinance on top of state law: height and setback limits, hillside and coastal overlays, and LADBS formatting quirks. We draw every set to the current City of LA amendments, so plans clear plan check with fewer correction cycles.
Where you submit matters too. Parcels inside the City of Los Angeles go through LADBS and its e-Plan electronic submittal, while Burbank, Glendale, Pasadena, Santa Monica, and Long Beach each run their own building departments with their own ADU checklists, and unincorporated lots go to LA County Building and Safety instead. We tell you which desk your project lands on, and what that means for timeline, before you sign anything.
Address, photos, and what you want to build, we check zoning and feasibility free.
One flat price for the complete permit set. No hourly surprises.
Architecture, structural, Title 24, and MEP produced as one coordinated set.
Submit to LADBS. We answer plan-check corrections free until approval.
Architecture, structural engineering, MEP, and Title 24 together, no juggling three firms whose drawings don’t match.
A flat written proposal before any work starts, never hourly billing.
Most ADU plan sets delivered in 2–4 weeks; corrections answered free.
White-label plan production for ADU builders and GCs who need overflow capacity.
Service areas: Los Angeles, San Fernando Valley, Long Beach, Glendale, Pasadena, Santa Monica, Burbank, Inglewood, and all of LA County. See also our ADU & JADU design service and structural engineering in Los Angeles.
An ADU permit set is not one drawing, it is the full stack of sheets a LADBS plan checker walks through line by line. Here is what we deliver, and why each piece exists in Los Angeles specifically.
Floor plans, elevations, sections, and a zoning-checked site plan showing setbacks, lot coverage, and the existing home. Every sheet is formatted for LADBS e-Plan electronic submittal, with the sheet index and naming conventions plan checkers expect, which is a quiet but real source of first-round corrections.
Los Angeles layers its own ADU ordinance on top of state law: 4 foot side and rear setbacks for new units, height limits that rise near transit, setback waivers for garage conversions, and no replacement parking anywhere in the city. We design to your lot’s actual entitlements, not a generic statewide template.
Nearly all of Los Angeles sits in a high seismic design category, with the Santa Monica, Hollywood, and Newport-Inglewood faults crossing the basin. Shear walls, holdowns, and drag lines get real scrutiny at LADBS, so we run the lateral analysis for your actual site values, not defaults a plan checker will question.
The Baseline Hillside Ordinance, Very High Fire Hazard Severity Zones, and HPOZ historic districts each add rules that can reshape an ADU. Mount Washington, Echo Park, the Hollywood Hills, and much of the east side trigger them routinely. We check your overlays at quoting so they never surprise you at plan check.
Energy calculations run for LA’s actual climate zone, plus the electrical, plumbing, and mechanical sheets a complete submittal needs. Because one team produces all disciplines, the water heater on the Title 24 form matches the one on the plumbing plan, which is exactly the kind of mismatch that bounces sets.
LADBS issues correction cycles on most first submittals, even good ones. Every Fast Build proposal includes answering plan-check comments at no extra charge until your permit is issued, so a correction letter costs you days, not another design invoice.
The most common way an LA ADU submittal stalls is a set whose disciplines do not match: an architectural plan showing one window layout while the Title 24 forms assume another, or structural calculations that reference a framing plan that was revised after they were run, which LADBS catches every time. The second is discovering an overlay late, because a garage conversion in Van Nuys and the same conversion on a hillside lot in Mount Washington are not the same project once slopes and fire-zone rules enter the design. Both problems are avoidable if the designer prices the real conditions up front, which is exactly what our free feasibility check does before you commit to anything.
Complete permit-ready ADU plan sets from Fast Build run $2,450–$9,850 depending on size and complexity. A garage conversion or JADU sits at the low end; a large new detached ADU with full structural, Title 24, and MEP sits at the top. You get one flat quote up front, no hourly billing.
California law requires cities to approve or deny a complete ADU application within 60 days. Our part, the full plan set, is typically delivered in 2–4 weeks, and we answer LADBS plan-check corrections at no extra charge so the clock keeps moving.
Yes. Garage conversions are the most cost-effective ADU in LA because the structure already exists. State law waives setback requirements for conversions of existing structures, and no replacement parking is required. We handle the architectural plans, structural check, and Title 24 energy calculations.
In most cases, yes. We produce as-built drawings of what exists plus the structural analysis the city requires. Under California AB 2533, cities can no longer deny a permit for an unpermitted ADU just because older work was done without one.
No, that is the point of Fast Build. Architectural design, structural engineering, Title 24 energy compliance, and MEP come from one team, in one coordinated permit set. You never have to shuttle drawings between three different firms.
Every LA lot with an existing or proposed home can have at least an 800 square foot ADU by state right, and detached ADUs generally go up to 1,200 square feet. The baseline height limit is 16 feet, with taller units allowed near transit or when attached to the main home, and a JADU adds up to 500 square feet inside the existing house. We confirm your lot’s exact maximums in the free feasibility check.
Usually yes, but LA’s Baseline Hillside Ordinance and Very High Fire Hazard Severity Zone rules add grading limits, retaining wall requirements, fire access rules, and extra structural design for slopes. Mount Washington, Echo Park, the Hollywood Hills, and similar neighborhoods trigger them routinely. We flag hillside conditions at quoting so they never surprise you at plan check.
No. Burbank, Glendale, Pasadena, Santa Monica, Long Beach, and every other incorporated city run their own building departments with their own ADU checklists, and unincorporated areas go through LA County Building and Safety. We format the set for whichever jurisdiction your parcel is in.
Free feasibility check on your lot + a flat-price quote within 24 hours. No obligation.
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