ADU Design & Blueprints in Torrance, CA
ADU Design & Permitting in Torrance means producing a permit-ready drawing set – site plan, floor plans, elevations, and structural details – that the City of Torrance Building & Safety Division will accept on the first submission. At Ellery ADU Studio, we’ve been delivering those drawing sets since 2015, and every one comes with a written price before pencil hits paper, per Haven Standard Clause 1. Call (424) 344-4822 to get your written quote – no estimate-by-phone, no ballpark figures that shift at signing.
The blueprint phase is where most Torrance ADU projects either get it right or spend six months in back-and-forth with the city. Torrance has its own quirks: a 1,200-square-foot ADU cap for detached units, setback rules that differ by zone (R-1 vs. R-2 vs. RA), and a fire-sprinkler requirement that kicks in at certain square footages. Get those wrong in the drawings and the plan check will send the whole set back. Our job is to make sure that doesn’t happen to you.
This page covers the design and blueprints sub-service specifically. If you want the full picture of how drawings connect to permit filing, contractor coordination, and final inspection, visit our ADU Design & Permitting in Torrance page.
When You Need ADU Design & Blueprints
- You own a lot in Old Torrance or the Southeast neighborhoods and want to add a rental unit. The older R-1 parcels in these areas often have detached garages, mature trees, and utility easements that have to be documented and resolved before any drawings are approved. A set of blueprints that ignores an existing sewer easement will stall your permit by weeks.
- You’ve been handed a contractor’s sketch and told it’s “basically ready to submit.” In our experience, a contractor sketch and a permitted drawing set are two very different documents. Torrance Building & Safety requires Title 24 energy compliance forms, a fully dimensioned site plan, and structural calculations stamped by a licensed engineer. A sketch has none of those.
- Your garage conversion project in the South Torrance hillside area needs setback clarification. Many parcels in that part of the city have non-conforming existing structures. Converting one of those into a living unit requires confirming that the conversion itself doesn’t create a new setback violation – something that only a survey-backed site plan can resolve.
- You’re considering a prefab unit and need drawings that reflect the manufacturer’s specifications. Prefab ADUs from brands like Abodu or Cover arrive with their own structural engineering, but the site drawings – foundation detail, utility connections, site plan – still have to be produced locally and submitted to Torrance Building & Safety. We produce those drawings and coordinate directly with the manufacturer so nothing gets lost between the factory specs and the permit set.
- A previous design firm delivered drawings that were rejected by the city. This happens more often than it should. We offer a Free Second Opinion on any drawing set already in hand. If the issues are correctable, we’ll tell you exactly what they are and what it costs to fix them – in writing, before we touch a thing.
- You’re planning a Junior ADU inside your existing home in the North Torrance or Walteria neighborhood and need interior conversion drawings. JADU blueprints have their own requirements: a deed restriction, a separate entrance, and efficiency kitchen documentation. The drawing set for a JADU is simpler than a detached ADU but not interchangeable with a regular remodel permit – it has to be filed as an ADU specifically.
Our ADU Design & Blueprints Process
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Written Scope and Price, Before Anything Starts
Under Haven Standard Clause 1, the written price you receive before we schedule a site visit is the price you pay for the drawing set – not a “starting at” figure. We quote design fees as a flat scope tied to the unit size, type (detached, garage conversion, JADU), and zoning complexity of your specific Torrance parcel. No door-side revisions to that number.
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Site Measurement and As-Built Documentation
We visit the property and measure what’s there: lot dimensions, existing structures, utility lateral locations, any easements noted on the assessor’s parcel map. In Torrance’s West Side neighborhoods, we often find gas laterals that don’t match the city’s utility records – knowing that before the drawings are finalized saves a costly revision later. You receive a documented photo record of what we found, not a verbal summary.
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Zoning and Code Analysis
Torrance applies both state ADU law (AB 2221, SB 897) and its own municipal code. We check your parcel’s zone classification, confirm the allowable ADU square footage and height, verify setbacks (typically 4 feet rear and side for detached ADUs on most Torrance R-1 lots), and flag any overlay districts – coastal zone, hillside grading, or HOA & Zoning Compliance fire hazard severity zone – that add a layer to the permit process. This analysis is documented and included in your project file.
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Schematic Design and Client Review
Before we produce the full construction document set, we present the schematic layout: floor plan, basic elevations, and a site plan showing the ADU footprint relative to your property lines. This is the stage to adjust room sizes, window placement, or the entrance location. Changes at schematic cost nothing extra under the flat scope; changes after the permit set is submitted do – and we tell you that plainly before you sign.
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Full Construction Document Set and Structural Engineering
The final drawing set includes: dimensioned floor plans, four-sided elevations, a cross-section, foundation plan, roof framing plan, electrical layout, Title 24 energy compliance documentation, and structural calculations stamped by our licensed structural engineer. For detached ADUs over a certain square footage in Torrance, the city also requires a soils report – we coordinate that directly. If you’ve chosen a prefab unit (a Dvele or a Mighty Buildings module, for example), the manufacturer’s structural package is incorporated into our site-specific drawings rather than treated as a separate deliverable.
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Plan Check Submission and Response Management
We submit the package to Torrance Building & Safety and manage every correction letter that comes back. First-round corrections on an ADU plan check in Torrance typically take 4-6 weeks; we respond to comments within the city’s resubmittal window and keep you updated in writing at each stage. The drawing set doesn’t leave our scope until you have an approved permit in hand – that’s what “ADU Design & Permitting Near Me in Torrance, CA as a single contract” means in practice.
ADU Design & Blueprints Pricing in Torrance
How Much Does ADU Design & Permitting Cost? (2026 Price Guide) - Torrance, CA figures run in a range tied to unit type and complexity. Every figure below comes with a written price before work starts – Haven Standard Clause 1 is not aspirational language, it’s the actual contract term.
| ADU Type | Typical Design & Blueprint Fee Range | What’s Included |
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| Junior ADU (JADU) – interior conversion | $6,500 – $9,500 | Full permit set, Title 24, deed restriction preparation |
| Garage conversion ADU (attached or detached) | $9,000 – $14,000 | As-built survey, structural analysis, full construction documents |
| Detached ADU, standard lot (up to 800 sq ft) | $13,000 – $19,000 | Full permit set, structural engineering, Title 24, soils coordination if required |
| Detached ADU, larger or complex lot (800-1,200 sq ft) | $17,000 – $26,000 | Full permit set, structural engineering, survey coordination, all city corrections through approval |
| Prefab ADU site drawings (Abodu, Cover, etc.) | $8,000 – $13,000 | Site plan, foundation plan, utility connections, manufacturer coordination |
A few things that push a project toward the higher end of any range: a hillside lot in South Torrance that triggers grading review, a parcel in the coastal zone (a strip of Torrance’s western edge falls under Coastal Commission jurisdiction), an existing structure with non-conforming conditions that require a variance application, or a lot with drainage patterns that require a civil engineer’s input before the foundation can be designed.
City of Torrance plan check fees are paid directly to the city and are separate from Ellery’s design fee. As of early 2026, Torrance charges ADU plan check fees on a valuation-based schedule – typically $1,500 to $4,500 for a standard detached ADU depending on the square footage and construction type. We include an estimate of city fees in your written quote so the total cost of getting to a permit is visible before you commit.
If you have a written estimate from another firm already in hand, bring it to us. The Free Second Opinion is genuinely free – we review the scope, flag anything missing (structural stamps, Title 24, soils coordination), and give you a written comparison. Call (424) 344-4822 to schedule that review.
FAQs – ADU Design & Blueprints
How long does it take to get ADU blueprints approved in Torrance?
From site visit to approved permit, most Torrance ADU projects take 4 to 7 months, with the plan check phase accounting for most of that time. Torrance Building & Safety typically takes 4 to 6 weeks for a first-round review on an ADU. State law requires the city to act within 60 days on a complete application, but “complete” is the operative word – an incomplete submission resets the clock. Our drawing sets are prepared specifically to meet Torrance’s completeness checklist, which is why our first-round correction letters tend to be shorter than what homeowners report getting from generalist drafting services. Call (424) 344-4822 to get a timeline estimate specific to your parcel and unit type.
Does the blueprint fee include structural engineering?
Yes – structural calculations stamped by a licensed structural engineer are part of the drawing set for all detached ADU and garage conversion projects at Ellery ADU Studio Torrance. Torrance Building & Safety requires stamped structural for any new habitable structure and for most garage conversions where the existing framing is being modified. The fee ranges listed on this page include that stamp; we don’t quote a design fee and then present structural engineering as a separate add-on at signing. That practice is explicitly prohibited under Haven Standard Clause 5. Call (424) 344-4822 if you want to confirm what’s included for your specific project type before requesting a quote.
Can Ellery design an ADU for a prefab unit I’ve already selected?
Yes. If you’ve already committed to a prefab unit – an Abodu, a Cover module, or another manufacturer’s system – we produce the site-specific drawings that Torrance requires: site plan, foundation design tied to the manufacturer’s load specs, utility connection details, and any grading documentation the city requests. We coordinate directly with the manufacturer’s engineering team to make sure our site drawings and their structural package don’t conflict at plan check. The fee for prefab site drawings typically runs $8,000 to $13,000, depending on lot complexity. Call (424) 344-4822 to confirm the scope for your specific unit and lot.
What’s the difference between a blueprint set and a simple floor plan sketch?
A floor plan sketch shows room layout and rough dimensions – useful for visualizing a design, not for pulling a permit. A permitted blueprint set for a Torrance ADU includes: a dimensioned site plan showing all setbacks, a dimensioned floor plan with all walls and openings called out, four elevations, a building section, a foundation plan, a roof framing plan, an electrical plan, Title 24 energy compliance documentation, and structural calculations stamped by a licensed engineer. Torrance Building & Safety will not accept anything less as a complete application. Homeowners in the El Nido and Seaside neighborhoods have come to us after paying a drafting service for a “permit-ready” set that was missing Title 24 or structural stamps – the city rejected it on the first submission and the project lost four months. A complete set costs more upfront; it costs less over the life of the project. Call (424) 344-4822 and we’ll walk you through exactly what your project requires.
What You Receive at the End of the Blueprint Phase
When Torrance Building & Safety stamps your drawing set approved, you receive a physical and digital copy of the full approved construction document package. That set includes every sheet submitted, every correction letter and our written response, and the approved permit card. The approved drawings are also what our construction crew builds from – because design and construction are a single contract at Ellery, there’s no translation step between what the designer drew and what the builder reads. The 365-Day Done Right Promise is written into the contract before work starts: if the finished ADU isn’t built to the permitted drawings, we make it right.
Since 2015, Ellery ADU Studio has produced drawing sets for more than 900 ADUs across the South Bay and Los Angeles metro. The ones in Torrance have ranged from 400-square-foot JADUs in Walteria to 1,200-square-foot detached two-story units on the larger lots along Sepulveda Boulevard – each one priced in writing before the first site visit and documented from site measurement through final inspection.
The home page gives you the full picture of how the design-build model works across all five service categories. And if you want to understand how the blueprint phase connects to the permit filing and construction phases, the ADU Design & Permitting in Torrance page covers that in detail.
To get a written price for your Torrance ADU drawing set, call (424) 344-4822. A live person picks up – no voicemail queue, no callback window. If you have a written estimate from another firm, bring it and we’ll give you a written comparison at no charge.
Written by Nadia Ellery, Owner at Ellery ADU Studio Torrance, serving Torrance.