Los Angeles is one of the most ADU-friendly cities in California. The state has stripped away most of the old barriers — setback requirements loosened, owner-occupancy rules eliminated, fees reduced. On paper, building an accessory dwelling unit in LA has never been more straightforward.

In practice, most ADU projects still take 12 to 18 months from design to certificate of occupancy. A significant portion of that time isn't construction. It's waiting. Waiting on plan check. Waiting on corrections. Waiting on department coordination that nobody told the property owner was even required.

Three specific permit bottlenecks are responsible for the majority of ADU delays in Los Angeles. They're predictable, they're well-documented, and they're almost entirely avoidable — if you're working with a firm that understands the process from the inside.

Here's what they are, why they stall projects, and how SKS eliminates them.

Bottleneck #1: The LADBS Plan Check Correction Cycle

The Los Angeles Department of Building and Safety plan check is the first major gate every ADU project has to pass. Plans are submitted, a plan check engineer reviews them, and corrections are issued. The applicant responds to corrections, resubmits, and waits for another review cycle.

On paper, this sounds linear. In practice, it compounds.

First-time correction letters from LADBS on ADU projects routinely run 20 to 40 individual items — structural calculations, energy compliance (Title 24), accessibility notes, egress requirements, fire separation distances, electrical panel capacity, utility connections. Each item requires a response. Each response requires the plan check engineer to re-review the relevant sheet. If the response introduces a new issue — even a minor one — it opens another correction cycle.

The firms that get caught in this loop are the ones who separate design from engineering. An architect draws the plans. A structural engineer stamps the calculations. A third party handles Title 24 energy compliance. Nobody owns the complete picture, so nobody catches the conflicts before submission. LADBS catches them instead — and charges you weeks per cycle.

The fix is integration. When the architect, structural engineer, and Title 24 analyst are working from the same model under one roof, conflicts are resolved before the first submission. SKS's in-house team coordinates every discipline internally. Our ADU plan check submissions are complete, coordinated packages — and our correction cycles are a fraction of the industry average.

Bottleneck #2: The LADWP Electrical Service Upgrade

This is the permit delay that blindsides more ADU owners than any other — because it doesn't come from LADBS. It comes from the Los Angeles Department of Water and Power, and it operates on an entirely separate timeline.

Most existing single-family and multifamily properties in LA are served by 100-amp or 150-amp electrical service. Adding an ADU — especially one with a kitchen, HVAC, EV charging, or a heat pump water heater — typically triggers a service upgrade to 200 amps or higher. That upgrade requires an LADWP service application, an engineering review by LADWP's own staff, physical transformer capacity verification for your specific service address, and a field inspection after the new meter base and panel are installed.

LADWP is not LADBS. It does not operate under the same review timelines. It does not respond to the same escalation channels. And critically — your LADBS building permit cannot receive final sign-off until LADWP has approved and energized the upgraded service.

Projects that don't anticipate this get to the finish line of construction and then sit. The ADU is built. The contractor is done. The tenant is ready to move in. And the project is on hold waiting for LADWP to complete a service upgrade that should have been initiated four months earlier.

SKS handles LADWP coordination in-house, initiated concurrently with LADBS plan check — not after. Our team knows which service addresses require transformer upgrades, how to pre-qualify panel sizing before submission, and how to keep LADWP's timeline parallel to construction rather than sequential to it. We've completed hundreds of panel upgrades across LA, and we manage the utility coordination the same way we manage everything else: as part of one contract, not as an afterthought.

Bottleneck #3: The Bureau of Engineering Sewer Capacity Review

The third permit bottleneck is the one almost nobody talks about until it's already stalling their project.

Adding a dwelling unit in Los Angeles — any dwelling unit — triggers a sewer capacity review by the LA Bureau of Engineering. The BOE reviews whether the existing sewer lateral serving your property has sufficient capacity to accommodate the added wastewater load from the new ADU. If capacity is marginal, or if the lateral is older and undersized, BOE can require a lateral upgrade or upsizing before they'll issue a sewer permit.

This review sits entirely outside the LADBS process. It has its own application, its own queue, its own review staff, and its own response timeline — which, depending on workload, can run six to twelve weeks. Projects that don't initiate the BOE sewer review early — and simultaneously with plan check — routinely find themselves with approved LADBS plans and no path to a building permit because the sewer clearance is still pending.

Worse: if BOE identifies a lateral deficiency, the cost and timeline of the lateral work can materially change the project budget. Owners who discover this at permit issuance — rather than at project kickoff — have no time to plan for it.

SKS initiates the BOE sewer review at project inception, before design is even finalized. Our engineers assess the existing lateral condition, anticipate capacity requirements based on the ADU's fixture count and unit size, and file the BOE application concurrent with plan check. If lateral work is required, it's scoped and budgeted upfront — not discovered as a surprise six months in.

Why These Delays Keep Happening — and Who's Responsible

All three of these bottlenecks are well-known to anyone who has closed a significant volume of ADU permits in Los Angeles. They are not mysteries. They are predictable, sequenceable, and manageable — if the firm you hire has the experience and internal infrastructure to manage them.

The problem is that most firms handling ADU projects in LA don't. Design firms hand off to permit expediters. Permit expediters work sequentially. General contractors wait for permits before they plan construction logistics. Nobody is accountable for the full timeline — so nobody optimizes it.

The result is a 14-month ADU project that should have taken nine.

What the SKS Design-Build Process Actually Looks Like

SKS Construction has been design-building in Los Angeles since 1987. Every ADU project we take on is delivered under a single contract covering architectural design, structural engineering, Title 24 energy compliance, LADBS plan check, LADWP coordination, BOE sewer review, construction, and certificate of occupancy.

No handoffs. No finger-pointing between your architect and your contractor. No permit expediters working a queue they didn't design for.

Our in-house licensed engineer owns the structural package from design through city sign-off. Our permit team initiates all three review tracks — LADBS, LADWP, and BOE — concurrently at project kickoff. Our construction crews are scheduled around permit milestones, not after them.

We build attached ADUs, detached ADUs, garage conversions, and second-story additions across Los Angeles, West LA, Beverly Hills, the San Fernando Valley, and beyond. Fixed-price bids. No subject-to-change clauses. 39 years. Over 3,000 completed projects. 80% repeat clients.

The three permits that delay everyone else? For SKS, they're just part of the checklist.

Get a FREE ADU Design and Feasibility Consultation

If you're considering an ADU on your Los Angeles property — whether it's a detached unit, a garage conversion, or a second-story addition — the single most important decision you'll make is who manages the permit process.

SKS Construction offers FREE ADU feasibility consultations for property owners across LA County. Our team will assess your lot, evaluate your utility service conditions, identify any BOE or LADWP flags early, and provide a fixed-price design-build proposal — no obligation, no surprises.

Call (818) 855-1181 or email info@sksconstruction.com to schedule your FREE consultation today.

One contract. One team. Three permits handled before they become problems.

SKS Construction | Design | Engineer | Build | Since 1987 (818) 855-1181 | info@sksconstruction.com