ADU Design & Blueprints in Santa Clarita, CA
ADU Design & Permitting in Santa Clarita covers the full set of construction drawings, site plans, and architectural documents your project needs before a permit can be issued or a wall can go up. At Ellery ADU Studio, that drawing set is not a deliverable we hand off to a separate contractor – it is the foundation of a single contract that runs from the first sketch through final inspection. If you are looking at a detached unit in Saugus, a garage conversion in Stevenson Ranch, or a junior ADU carved from existing square footage in Canyon Country, the blueprint phase determines whether your project sails through the City of Santa Clarita’s Development Services counter or stalls for months in plan check.
Our design work sits under our broader ADU Design & Permitting in Santa Clarita practice, which means the architect who draws your plans and the crew who builds from them are working off the same written scope at the same written price. That structure matters here because Santa Clarita operates under the Los Angeles County Building and Safety Division for unincorporated parcels while the incorporated city runs its own plan check – and the two have meaningfully different submittal checklists. Getting the drawings right the first time is the difference between a six-week permit window and a four-month correction loop.
Nadia Ellery leads every design engagement personally. She has guided ADU blueprint sets through Santa Clarita’s Development Services since 2015, the same year California’s foundational ADU reform bills began reshaping what local jurisdictions could and could not require. Call us at (747) 294-4817 – a live person answers, no voicemail queue. Every project begins with a written price before any work starts, per Haven Standard Clause 1.
When You Need ADU Design & Blueprints
- You own a lot in Santa Clarita with room for a detached unit – but you have no drawings and no idea whether your setbacks, lot coverage, or slope restrictions allow what you are imagining. Santa Clarita parcels in neighborhoods like Sand Canyon and Tesoro del Valle frequently carry hillside grading conditions that show up in the blueprint phase, not at the counter.
- You have a contractor who wants to start construction but has nothing to build from. A verbal agreement and a napkin sketch are not a permit set. Without stamped architectural drawings and a site plan keyed to your assessor’s parcel number, no inspector will sign off on a foundation, framing, or final.
- You received a correction letter from plan check. Santa Clarita’s plan checkers issue Title 24 energy compliance corrections and accessibility notes that require the original architect of record to respond. If the designer who drew your plans has gone quiet, we can step in, review what was submitted, and redraw what needs to change.
- You are considering a prefab or modular unit from a brand like Cover or Dvele. These systems arrive with manufacturer drawings, but Santa Clarita still requires a site-specific permit set: a graded site plan, foundation detail keyed to your actual soils report, utility connections, and in many cases a CalGreen checklist. The manufacturer’s drawings alone will not pass plan check.
- Your property is in a high fire hazard severity zone. Large portions of Santa Clarita – particularly the northern edges near Agua Dulce and the hillside tracts above Newhall – fall inside the Very High Fire Hazard Severity Zone. Blueprint sets for those parcels require ignition-resistant construction details, ember-resistant vent specifications, and in some cases defensible space calculations drawn into the plans before submittal.
- You have an unpermitted structure you want to legalize. As-built drawings for an unpermitted garage conversion or backyard cottage require field measurement, code compliance analysis against the year the structure was built, and a full permit set. This is a design engagement, not a simple inspection.
Our ADU Design & Blueprints Process
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Site Assessment and Feasibility
We visit the property, measure the lot, and pull the current assessor’s parcel data, zoning designation, and any recorded easements or deed restrictions. For Santa Clarita parcels, we also check whether the parcel falls under city jurisdiction or unincorporated LA County, because the two submittal packages differ. You receive a written feasibility memo – what fits on your lot, what does not, and why – before any design work begins.
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Written Price Before Any Work Starts
Once feasibility confirms the project is viable, we produce a fixed-price proposal covering every drawing in the permit set: site plan, floor plans, elevations, sections, foundation plan, roof plan, electrical and plumbing schematics, Title 24 energy calculations, and CalGreen checklist. Per Haven Standard Clause 1, that price is written and locked before we draw a single line. There are no hourly overages, no scope-creep invoices at submittal.
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Schematic Design and Owner Review
We produce a schematic set – typically three to five sheets showing layout options and massing – and walk through it with you in a scheduled review. This is where square footage, ceiling height, window placement, and exterior finish are decided. We name the materials on the drawing (James Hardie fiber-cement lap siding is a common specification in Santa Clarita because it meets both HOA & Zoning Compliance aesthetic requirements and the WUI ignition-resistant construction mandate in one selection). Revisions at this stage are included in the written price.
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Construction Documents and Permit Set
The schematic becomes a full construction document set: dimensioned floor plans, detailed wall sections, a foundation plan keyed to a soils report if the site requires one, MEP (mechanical, electrical, plumbing) schematics, and all the CalEnergy and CalGreen compliance documentation Santa Clarita requires at submittal. For modular or prefab units – Mighty Buildings, for example – we incorporate the manufacturer’s structural drawings and coordinate the interface details so the city receives one coherent package, not two disconnected submittals.
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Submittal and Plan Check Response
We submit the permit set to the City of Santa Clarita Development Services Center or the LA County Building and Safety office, depending on jurisdiction. When the plan checker issues corrections – and on most first submittals they do – we respond in writing within the correction response window. Because we drew the plans, we can answer structural notes, energy compliance questions, and accessibility corrections without the back-and-forth that happens when an owner tries to relay comments between a designer and a contractor who have separate contracts.
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Issued Permit and Documented Photo Record
When the permit issues, you receive a copy of the stamped approved plans, the permit card, and the inspection schedule. From this point the same contract transitions into construction, and the documented photo record begins: photos of every inspection stage, filed to your project record. Under the 365-Day Done Right Promise, if the finished ADU does not match the permitted drawings, Ellery makes it right – in writing, before the project starts.
ADU Design & Blueprints Pricing in Santa Clarita
How Much Does ADU Design & Permitting Cost? (2026 Price Guide) - Santa Clarita, CA depends on unit type, square footage, site complexity, and whether the project involves a prefab system that requires coordination with manufacturer drawings. The ranges below reflect current Santa Clarita market conditions as of 2026. Every figure comes with a written fixed price before work starts – no estimates that balloon at submittal.
| Project Type | Typical Design & Blueprint Fee | Primary Cost Drivers |
|---|---|---|
| Junior ADU (interior conversion, up to 500 sf) | $6,500 – $11,000 | Existing wall conditions, separate entrance details, Title 24 compliance |
| Garage Conversion ADU (400 – 800 sf) | $8,500 – $14,000 | Slab evaluation, fire separation wall details, utility separation |
| Detached ADU – New Construction (400 – 800 sf) | $12,000 – $20,000 | Site slope, soils report requirement, WUI fire zone details |
| Detached ADU – New Construction (800 – 1,200 sf) | $17,000 – $28,000 | Full structural engineering, multi-zone HVAC schematics, complex grading plan |
| Prefab / Modular Coordination (Cover, Dvele, Mighty Buildings, etc.) | $7,000 – $13,000 | Manufacturer drawing integration, site-specific foundation detail, utility stub design |
A few cost factors specific to Santa Clarita worth naming directly:
- Fire hazard zone overlay: Parcels in the Very High Fire Hazard Severity Zone require additional drawing sheets covering ignition-resistant construction assemblies, ember-resistant venting, and in some cases a defensible space plan. Budget an additional $1,500 – $3,000 for this documentation depending on parcel location.
- Hillside and slope conditions: Lots in Sand Canyon, Plum Canyon, and the hillside tracts above Newhall regularly require a licensed geotechnical engineer’s soils report before the city will accept a foundation plan. The soils report itself runs $2,500 – $5,500 from local firms and is a pass-through cost, not a design fee markup.
- HOA submittal: Many Santa Clarita master-planned communities in Valencia, Stevenson Ranch, and Bridgeport require architectural committee approval before or concurrent with city submittal. We prepare the HOA package as part of the design engagement when applicable, included in the written price.
- Plan check fees: City of Santa Clarita and LA County plan check fees are paid directly to the jurisdiction. They run approximately $2,000 – $4,500 depending on valuation and unit size and are separate from design fees.
We offer a Free Second Opinion on any written ADU design estimate already in hand. If another firm has quoted you a blueprint fee, bring the written quote and we will review it line by line and tell you exactly what is included and what is not.
FAQs – ADU Design & Blueprints in Santa Clarita
How long does the ADU blueprint and permit process take in Santa Clarita?
From a signed contract to an issued building permit, most Santa Clarita ADU projects run between 10 and 18 weeks, depending on city workload and correction rounds. The City of Santa Clarita’s Development Services Center has a standard plan check window of 4 to 6 weeks for a first-submittal residential ADU. Projects in unincorporated LA County parcels near Agua Dulce or Acton trend toward the longer end of that range. HOA review, when required in communities like Stevenson Ranch, adds 4 to 6 weeks and runs concurrently when we submit both packages at the same time. Call (747) 294-4817 for a timeline estimate specific to your parcel – a live person picks up, and we can usually tell you the jurisdiction and rough schedule in a single call.
Do I need a soils report before you can draw the foundation plan?
For new detached ADUs in Santa Clarita, the city frequently requires a soils report before approving a foundation plan, particularly on sloped lots and parcels in the hills above Newhall and Sand Canyon. For slab-on-grade garage conversions on flat lots with an existing permitted slab, the requirement is less common. We assess this at the feasibility stage, name it in writing before design begins, and coordinate the geotechnical firm directly so you are not managing a separate vendor. If a soils report is required, the cost ($2,500 – $5,500 from local firms) is a pass-through at cost, documented in the written price per Haven Standard Clause 1.
Can you draw plans for a prefab ADU like a Mighty Buildings or Dvele unit on my Santa Clarita property?
Yes. Prefab and modular ADUs require a site-specific permit set regardless of what the manufacturer provides. We have coordinated blueprints for multiple prefab systems – including Mighty Buildings and Cover – in the Santa Clarita area. Our process is to obtain the manufacturer’s structural and architectural drawings, then produce the site plan, foundation design keyed to your specific soils conditions, utility connection schematics, and CalGreen documentation that Santa Clarita requires as a complete submittal package. The manufacturer’s drawings alone will not pass plan check. Prefab coordination design fees typically run $7,000 – $13,000 depending on site complexity, with a written price confirmed before work starts. Call (747) 294-4817 to discuss your specific unit and lot.
What exactly is included in the permit set you produce?
A complete Santa Clarita ADU permit set from Ellery ADU Studio includes: a site plan showing the ADU footprint, setbacks, lot coverage calculation, and utility connections; dimensioned floor plans; four-sided exterior elevations; wall sections and details; a foundation plan (with soils report coordination if required); roof framing plan; electrical schematic; plumbing schematic; mechanical (HVAC) schematic; a Title 24 energy compliance report; and a CalGreen checklist. For fire hazard severity zone parcels, we add the ignition-resistant construction assembly sheets and ember-resistant vent specifications. You receive a full copy of the stamped approved set when the permit issues – not a summary, the actual drawings – along with the permit card and inspection schedule. This is what we mean when we say the permit set is the core product, not an afterthought.
Why Santa Clarita Homeowners Work With Ellery ADU Studio
Since 2015, Nadia Ellery and the Ellery ADU Studio team have produced blueprint sets for more than 900 ADUs across the Los Angeles metro. In Santa Clarita, that track record includes projects in Valencia, Saugus, Newhall, Canyon Country, Stevenson Ranch, and Castaic – a range of jurisdictions, soil types, fire zone overlays, and HOA requirements that most single-city design firms never encounter.
The design-build model is the practical difference. When a plan checker in Santa Clarita issues a correction on a shear wall detail, our structural engineer responds directly. When a Valencia HOA architectural committee asks for a revised elevation showing a different roofline, we draw it. There is no handoff between a designer who is done and a builder who is confused by the drawings. One contract, one written price, one point of contact through permit issuance and into construction.
The Ellery ADU Studio homepage has a full description of The Haven Standard and the 365-Day Done Right Promise if you want to read the specifics before calling. We encourage that – the clients who read it first tend to ask the sharpest questions, and those projects go the smoothest.
For a written price on your Santa Clarita ADU blueprint project, call (747) 294-4817. A live person answers. The first conversation is a feasibility discussion, not a sales call, and you will leave it knowing whether your lot and your program are buildable before any money changes hands.
Written by Nadia Ellery, Owner at Ellery ADU Studio Santa Clarita, serving Santa Clarita.