As-built drawings ADU cost is one of the most common questions LA homeowners ask once they realize they need documentation before their architect or contractor can move forward. Many LA homeowners planning an ADU don’t realize they need as-built drawings until an architect or contractor asks for them. Then the quotes arrive and the confusion starts. If you’re wondering what as-built drawings for an ADU actually cost, you’re asking the right question at the right time. The answer depends on a handful of specific variables, and once you understand them, the number makes sense.

For most projects in Los Angeles County in 2026, the as-built drawings ADU cost runs between $2,500 and $9,000 for a professional documentation set. Small, simple units land at the lower end. Larger garage conversions with complex conditions or BIM deliverables push toward the top. The rest of this article breaks down exactly what drives your quote and how to keep costs reasonable without cutting corners that LADBS will catch later.

What Is Included in the As-Built Drawings ADU Cost?

A standard as-built package for an ADU includes a site visit for field measurements, a floor plan of the existing structure (the main house, the garage, or the detached unit), and basic exterior elevations. These are the core deliverables most LA documentation firms include before any add-ons enter the picture. That foundation covers what LADBS needs to see the existing conditions before reviewing what you’re proposing to build.

Several common add-ons move the price upward, and they’re worth understanding before you compare quotes. Laser scanning, detailed utility or MEP documentation, additional elevation sheets, a site plan with verified setbacks and easements, Revit or BIM modeling, and extra revision rounds all cost more. These aren’t hidden fees; they’re scope decisions that depend on what your project actually requires and what LADBS will ask for at plan check.

One distinction that saves a lot of confusion: as-built drawings and permit drawings are not the same thing. As-built or existing-conditions documentation captures what exists right now: the structure as it stands before any design work begins. The permit drawing set is what your architect submits to the city showing what will be built. You typically need both, in sequence. The as-built scope is the foundation; design drawings come after. Understanding this prevents homeowners from thinking one service covers everything when it doesn’t.

Four Factors That Can Change Your As-Built Drawings ADU Cost

Square footage is the most direct cost driver. A 400 SF detached ADU takes significantly less time to measure and draft than a 1,200 SF garage conversion with a loft and irregular footprint. When the existing main house also needs to be documented for LADBS review, the scope expands further. More space means more field time and more drafting hours.

Site and structural conditions are the second variable. Sloped lots, structures built in phases over decades, older buildings with no original plans, and units with non-standard geometry all require more effort in the field and at the drafting stage. A clean rectangular unit on a flat lot is the fastest scenario to document. Anything that makes the measurer’s job harder in the field makes the quote higher.

File format matters more than many clients expect. Standard 2D AutoCAD delivery is the most cost-effective option and is commonly used for LADBS plan sets, note that final city submittals are made as PDFs via ePlanLA, but 2D CAD is the standard working format that design teams rely on. Revit or full BIM modeling takes more time to produce and costs more accordingly, but your architect of record may specifically require it to integrate the as-built data into their design workflow. Ask your design team what format they need before you commit to a scope, because upgrading format after the fact costs more than specifying it upfront.

Rush turnaround adds a real premium. Standard delivery for a basic residential as-built set in LA is commonly 3 to 5 business days, with more complete permit-ready packages taking one to three weeks. If you need the drawings in 48 to 72 hours, expect to pay a substantial expedited fee on top of the base price. If you’re not working against a hard deadline, standard timing is a straightforward way to reduce cost without sacrificing quality.

Drafter, architect, or surveyor: who should you hire for ADU as-built work?

Specialized as-built documentation firms focus entirely on field measurement and CAD production. They’re structured for this work specifically, which means faster turnaround, more predictable flat-fee pricing, and permit-ready deliverables without design consultation fees layered on top. Hourly rates for drafters range from $30 to $150 depending on experience and firm size, but most residential projects are quoted as flat fees, which is better for budget control.

A licensed architect makes sense when you need someone to handle both the existing-conditions documentation and the full design and permit set, or when the project has enough complexity to require professional stamps. Architects typically bill at $100 to $250 per hour, and their involvement adds cost that isn’t necessary when the scope is purely documentation. For a straightforward garage conversion or detached ADU where you just need accurate as-builts to hand off to a design team, that overhead doesn’t serve you.

Land surveyors handle property boundary and legal surveys, not building interior documentation. Clients sometimes assume a surveyor produces as-built floor plans; they don’t. A measured survey focused on ADU documentation is a different scope entirely. Survey work is relevant if your site plan requires verified legal boundaries, but it’s billed at $60 to $140 per hour and it’s not a substitute for a full as-built documentation service. If your project needs both, they’re typically engaged separately.

How LADBS requirements shape your scope and your budget

What the city expects at submittal

LADBS requires a specific submittal package for ADU permits: a site plan with setbacks, floor plans, elevations, and, when the ADU modifies an existing structure, documented existing conditions. For attached ADUs and garage conversions, the city needs to see what’s there before it can approve what’s proposed. That requirement is why many LA homeowners need as-built documentation before any design work can begin.

Garage conversions carry the heaviest documentation load of any ADU type in Los Angeles. The existing structure must be fully documented before design work starts, because LADBS reviews the conversion against those baseline conditions. Detached new-construction ADUs require less as-built work since there’s no existing unit to document, though a site plan with accurate field measurements is still a standard part of the submittal package.

Plan-check corrections and revision costs

Plan-check corrections are a real cost factor that most clients don’t budget for upfront. When LADBS returns a plan check with corrections, the documentation firm may need to revise sheets, add documentation, or make an additional site visit. Many packages include a limited number of revision rounds, commonly one or two, and anything beyond that is billed separately. A firm that knows LADBS requirements from direct local experience will produce fewer correction-worthy drawings in the first place, which is one of the most practical arguments for hiring a local specialist over a national drafting platform.

Realistic ADU as-built drawings costs in Los Angeles for 2026

For a straightforward detached ADU or single-car garage conversion under 600 SF with a simple footprint, expect to pay $2,500 to $4,500 for a complete as-built set including site plan, floor plan, and exterior elevations in AutoCAD. Field measurement and basic drafting are included at this tier, and this range covers the majority of standard residential ADU documentation in LA.

For a larger detached unit, a multi-level garage conversion, or a project where the existing main house also needs to be documented for LADBS review, budget $4,000 to $7,500. Additional sheets, more extensive field work, and greater drafting complexity all push toward the upper end of this range.

Projects requiring Revit delivery, 3D laser scanning, or tight turnaround can reach $7,500 to $10,000 or more. This tier is most common for architects and developers who need precise data for complex design or structural engineering work, or for any project where the field conditions are too complex to capture reliably with manual measurement alone.

How to lower your ADU as-built drawing cost and get an accurate quote

Come prepared with the right information

The fastest way to get an accurate flat-fee quote is to have the right information ready before you reach out. You’ll want the property address, approximate square footage of the existing structure and the ADU unit, the ADU type (garage conversion, detached, or attached), the required delivery format (AutoCAD or Revit), and your target submittal date. Firms that receive complete information upfront can quote confidently. Firms that don’t know the full scope add contingency buffers that inflate the number.

Before signing with any firm, ask these specific questions: Is the site visit and field measurement included in the quoted price? How many revision rounds are built into the fee? What happens if LADBS requests additional documentation after plan check? Will the deliverable be formatted for LADBS submittal? Transparent firms answer all of these directly. Firms that quote low and bill high tend to go vague on revision limits and scope boundaries.

As-Built Drawings Los Angeles provides flat-fee pricing for LADBS-compliant ADU documentation across Los Angeles County and the surrounding region. The team works exclusively in local jurisdictions and knows what the city expects at plan check, which means fewer revision rounds between first submittal and permit issuance. Whether you’re converting a garage in Silver Lake or documenting an existing structure in the Valley, reach out directly for a scope-specific quote based on your actual project conditions.

Putting the numbers in perspective

The cost of ADU as-built drawings in Los Angeles in 2026 is a real and manageable line item when you know what drives it. Size, structural complexity, file format, and turnaround time are the four levers. Understand what LADBS requires for your specific ADU type before committing to a scope, and choose a firm that specializes in LADBS-compliant documentation rather than a generalist who has to figure out local requirements on your dime.

For most LA projects, you’ll spend between $2,500 and $9,000 for a complete, permit-ready as-built plan set. Working with a specialist who knows the jurisdiction, the plan-check process, and the architectural as-built cost landscape keeps you toward the lower end of that range for equivalent quality, and gets you to permit approval faster.