Trusted New Detached ADU for Santa Clarita Homeowners
A new detached ADU in Santa Clarita typically costs $285,000-$485,000 all-in, from permit-ready drawings through final inspection, depending on size, finish level, and whether you choose custom stick-built or a prefab system like Cover or Dvele. Ellery ADU Studio has designed, permitted, and built over 900 ADUs since 2015, the year California’s statewide ADU laws shifted, and every project has started with a written price before any work began. Call (747) 294-4817 to schedule your free estimate.
We’re Nadia Ellery’s team at Ellery ADU Studio, and we work only on ADUs. Not kitchens. Not room additions. Just accessory dwelling units, start to finish, under one contract at one written price. Santa Clarita’s specific zoning, the hillside overlay zones in Canyon Country, the tighter setbacks in Valencia’s planned communities, the septic constraints in Sand Canyon - we’ve navigated all of it. Our permit sets are the core product, not an afterthought, because a set that doesn’t pass plan check on first submittal costs you two to four months and thousands in carrying costs.
Our clients in Santa Clarita are homeowners who bought between 2015 and 2022, paid a premium, and now need to make the property work harder. A detached ADU rents for $2,200-$3,400 monthly in this market, depending on bedroom count and proximity to CalArts or the Metrolink station. The decision is financial, not sentimental. We treat it that way.
What Our New Detached ADU Service Includes
Custom Built ADU
A custom built ADU is stick-framed on your property from foundation to finish, designed to your specific site conditions and aesthetic preferences. You need this when your lot has irregular geometry, significant slope, or design review requirements that a standard plan won’t satisfy, or when you want materials and finishes that match your existing home exactly. At Ellery ADU Studio Santa Clarita, we produce the architectural drawings, structural calculations, Title 24 energy compliance, and full permit set in-house, then build from that same documentation - no handoff gap between designer and builder, no finger-pointing when the as-built doesn’t match the plans.
Prefab ADU Installation
Prefab ADU installation means a unit manufactured off-site, delivered in modules or panels, and set on a foundation we prepare. You need this when speed matters more than customization, or when you’ve selected a specific system like Cover’s light-steel frame units or Dvele’s fully finished modules. We coordinate the manufacturer’s lead times with our site prep and utility tie-ins, all under the same contract at the same written price. In Santa Clarita, prefab units typically compress the construction timeline by 30-45% compared to stick-built, though permit timelines remain similar.
Modular ADU
Modular ADUs are factory-built to California’s HCD standards, transported as complete boxes, and craned onto your foundation. You need this when you want a fully finished interior - flooring, fixtures, appliances included - with minimal on-site trades work. We’ve specified and coordinated modular systems from Mighty Buildings and Boxabl within our single-contract model, handling our New Detached ADU in Stevenson Ranch manufacturer’s installation requirements alongside our foundation, utility, and final connection work. The key difference from prefab panel systems: modular arrives nearly complete, so the critical path shifts to factory scheduling rather than on-site labor.
Studio ADU
A studio ADU is a single-room dwelling, typically 300-450 square feet, with a full kitchen and bath but no separate bedroom. You need this when your lot size or budget doesn’t support a larger unit, or when the intended use is a home office, guest space, or single occupant rental. In Santa Clarita, studio ADUs rent for $1,800-$2,500 monthly and often pencil better on a cost-per-square-foot basis than larger units. We design these for efficiency: Murphy beds, built-in storage, and kitchenettes that meet code without consuming floor area. Our permit sets for studios include the reduced parking analysis that Santa Clarita allows under state law.
1-Bed & 2-Bed ADU
One-bedroom and two-bedroom ADUs range from 450 to 850 square feet and command the highest rents in Santa Clarita’s market. You need this when the unit will house family long-term, or when rental income is the primary goal - a 2-bedroom near College of the Canyons or the Metrolink station rents for $2,800-$3,400. We model the bedroom count against your lot coverage, floor area ratio, and setback requirements in Santa Clarita’s zoning code to find the maximum allowable unit. The Haven Standard, Clause 3, requires that we document this analysis in writing before you sign, so you know exactly what size you’re getting and why.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Brands We Specify and Coordinate for New Detached ADU
We work with Cover’s light-steel framing system for clients who want a modern, minimal aesthetic with fast factory turnaround - typically 14-16 weeks from order to delivery. Cover units integrate well with Santa Clarita’s design review processes in planned communities because the exterior finish options are limited and predictable, which simplifies approval. We’ve also coordinated Dvele’s fully finished modules for homeowners who want to minimize on-site construction disruption, particularly on tight lots in Saugus or Newhall where staging space is limited.
Mighty Buildings’ 3D-printed polymer composite units and Boxabl’s foldable room modules are newer to the California market, and we’ve specified both for specific site conditions where traditional framing is impractical. Mighty Buildings’ fire-resistant material performs well in Santa Clarita’s high fire severity zones, and Boxabl’s compact shipping profile works for our New Detached ADU in Castaic properties with narrow access in Canyon Country’s hillside streets. Whether you have one of these systems in mind or any other manufacturer, we can evaluate it against your site constraints, budget, and permit timeline - and we’ll tell you honestly if a given system doesn’t make sense for your property.
Signs You Need a New Detached ADU Right Now
- Your mortgage payment has outpaced your income growth. Santa Clarita homeowners who bought at 2021-2022 peaks are carrying payments $800-$1,500 above comparable rents for their own homes. A detached ADU generates income from the same property without selling into a down market. We’ve completed 200+ ADUs for homeowners in this exact position since 2022.
- Your adult children need housing but can’t afford Santa Clarita rents. The median one-bedroom apartment in Santa Clarita rents for $2,350. A studio ADU on your property gives family members independence at a fraction of market rate, while preserving your equity. Our 1-bedroom and 2-bedroom units include separate entrances and full kitchens to maintain actual separation.
- You’ve received a notice about unpermitted structures. Los Angeles County and Santa Clarita have increased enforcement against unpermitted backyard structures, particularly in areas with recent wildfire damage where unpermitted construction affects insurance and emergency access. Converting or replacing an unpermitted structure with a fully permitted ADU protects your property value and eliminates liability.
- Your property has unused flat area that meets setback requirements. Santa Clarita allows detached ADUs on lots as small as 5,400 square feet in R-1 zones, with setbacks of 4 feet from side and rear property lines under state law. If you have 500+ square feet of usable space beyond your primary dwelling’s footprint, you’re likely sitting on buildable area that generates zero return.
- You’re within 10 years of retirement and need income diversification. A detached ADU in Santa Clarita typically adds $150,000-$280,000 to appraised value while generating monthly income. The payback period on all-in cost ranges from 7-12 years at current rents, after which the unit produces net income for the life of the structure. We model this explicitly in our written estimates.
Our New Detached ADU Process - Step by Step
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Site analysis and feasibility report. We measure your lot, verify setbacks against Santa Clarita’s GIS parcel data, identify utility access points, and flag any hillside overlay, high fire severity zone, or HOA restrictions. You receive a written feasibility report with maximum allowable ADU size, estimated construction type, and a preliminary dollar range before you commit to design.
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Design and permit set production. Our architects produce floor plans, elevations, structural calculations, Title 24 energy compliance, and all required Santa Clarita submittal sheets. The permit set is the core product - we don’t outsource this to a drafter who hasn’t walked your lot. Typical production time is 4-6 weeks for standard designs, 8-10 weeks for complex hillside sites.
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Permit submittal and plan check response. We submit to Santa Clarita’s Planning and Building & Safety departments, attend plan check meetings, and revise drawings for corrections. Our first-submittal approval rate is 94% because we know the city’s common corrections - drainage calculations for Canyon Country lots, fire sprinkler requirements for units over 1,200 square feet, and the specific detail sheets their engineers prefer.
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Site prep, foundation, and utility rough-in. We prepare the site, pour the foundation to the structural engineer’s specifications, and rough in water, sewer, gas, and electrical from your main service. Every visit produces a documented photo record that you receive, showing trench depths, pipe sizes, and connection points - evidence, not summaries.
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Structure installation and final inspection. For custom builds, we frame, enclose, and finish on site. For prefab or modular, we coordinate delivery, crane set, and final utility connections. All work is inspected by Santa Clarita’s building department at foundation, framing, mechanical, and final stages. The 365-Day Done Right Promise begins at certificate of occupancy: if the finished ADU doesn’t match the permitted drawings, we make it right in writing.
How Much Does a New Detached ADU Cost in Santa Clarita?
A typical studio ADU in Santa Clarita runs $285,000-$340,000 all-in, including drawings, permits, foundation, structure, finishes, and final inspection. A 1-bedroom unit runs $320,000-$395,000, and a 2-bedroom unit runs $380,000-$485,000. Prefab and modular systems from brands like Cover or Dvele typically land in the lower half of these ranges for comparable sizes because factory labor costs less than on-site framing, though freight and crane costs offset some savings.
What moves the price within these ranges: site access difficulty (hillside lots in Canyon Country or Sand Canyon add 8-15% for retaining walls and specialized equipment), utility distance (extending sewer 100+ feet from the main house adds $8,000-$15,000), finish level (appliance packages, flooring, and fixture grades span $15,000-$40,000), and foundation type (standard slab versus engineered pier foundations on slope).
How to avoid overpaying: get a written line-item quote that separates design, permit, site prep, structure, finishes, and contingency. Under Haven Standard Clause 1, every Ellery ADU Studio estimate is exactly that - written, line-itemed, and fixed before any work starts. No “allowances” that balloon later. No verbal promises. We also offer a Free Second Opinion on any written estimate you already have in hand; we’ll identify where another contractor buried costs or underestimated scope.
What’s included in our free estimate: site visit, feasibility analysis, preliminary floor plan with dimensions, written price range with line-item breakdown, and permit timeline based on Santa Clarita’s current plan check backlog. Call (747) 294-4817 to schedule.
New Detached ADU Near Santa Clarita - Our Service Area
We design and build detached ADUs throughout the Santa Clarita Valley and surrounding communities, including New Detached ADU in Stevenson Ranch, New Detached ADU in Sylmar, San Fernando, Castaic, Granada Hills, Porter Ranch, Mission Hills, Northridge, Chatsworth, Panorama City, and Winnetka. Response time for initial site visits is typically 3-5 business days in Santa Clarita proper, 5-7 days for outlying areas. We maintain active permit knowledge for Los Angeles County unincorporated areas as well as the cities of Santa Clarita and Los Angeles, because jurisdiction affects setback rules, fire sprinkler triggers, and utility connection fees.
Serving Santa Clarita, CA - Our Local Coverage Area
We’re based in the Santa Clarita area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked Questions - New Detached ADU in Santa Clarita
A new detached ADU is a self-contained residential unit built separate from your main house, with its own kitchen, bathroom, sleeping area, and entrance. In Santa Clarita, detached ADUs can be custom stick-built, prefabricated panel systems, or factory modular units, and state law allows them on any single-family lot with sufficient space. Ellery ADU Studio handles the design, permitting, and construction as a single contract at a single written price. Call (747) 294-4817 for a free estimate on your specific lot.
From signed contract to certificate of occupancy, a typical detached ADU in Santa Clarita takes 10-14 months: 2-3 months for design and permit set production, 2-4 months for plan check and approval (depending on Santa Clarita’s current backlog), and 6-7 months for construction. Prefab and modular systems can reduce the construction phase to 4-5 months but don’t shorten permitting. Our written estimates include a timeline based on current city processing times, not best-case scenarios.
A new detached ADU in Santa Clarita costs $285,000-$485,000 all-in, with studios at the lower end and 2-bedroom units at the upper end. Site conditions, utility extensions, and finish selections move the price within these ranges. Under Haven Standard Clause 1, Ellery ADU Studio provides a written, line-itemed price before any work begins - never an estimate that changes once construction starts. Call (747) 294-4817 for your specific quote.
Yes. We specify and coordinate all four brands within our single-contract model, handling manufacturer coordination, site prep, foundation, utility connections, and final finish. Cover and Dvele are our most frequently specified prefab/modular systems in Santa Clarita, with Mighty Buildings and Boxabl used for specific site conditions where their materials or shipping profiles offer advantages. We’ll recommend the appropriate system based on your lot, budget, and timeline - or confirm that custom stick-built is the better choice.
ADU construction is planned work, not an emergency service, and we don’t claim same-day dispatch for design or build activities. However, a live person answers our phone 24/7 to schedule site visits, answer questions about active projects, or address urgent issues like weather damage to a structure under construction. For homeowners facing enforcement action on unpermitted structures, we prioritize feasibility analysis and permit strategy to meet city deadlines.
Our 365-Day Done Right Promise covers the full structure: if any element of the finished ADU doesn’t match the permitted drawings or fails to perform as specified, we correct it at no additional cost. This is backed in writing before construction starts, not a verbal assurance. California law also provides implied warranties on structural elements and habitability, and our documentation supports any warranty claim with the photo record from every construction visit. Haven Standard Clause 7 details the specific claim process and response timeline.
Bring your property’s assessor parcel number (APN), a rough idea of your budget range, and any HOA documents or prior survey maps you have. We handle the zoning research, setback verification, and utility location; you don’t need to pre-determine what’s allowed. If you have written estimates from other contractors, bring them for our Free Second Opinion analysis. The initial site visit takes 60-90 minutes, and you’ll receive a written feasibility report within 3 business days. Call (747) 294-4817 to schedule.
Schedule Your New Detached ADU Service in Santa Clarita Today
Call (747) 294-4817 to schedule your free estimate. A live person will answer, or you’ll reach our 24/7 answering service with immediate message relay to Nadia Ellery’s team. We’ll walk your lot, produce a written feasibility analysis with preliminary pricing, and answer specific questions about your property’s constraints - no obligation, no pressure, no “call for a quote” runaround. Every project starts with a written price under Haven Standard Clause 1, and every build ends with a documented photo record and our 365-Day Done Right Promise in writing.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Santa Clarita since 2015.