A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateTrusted ADU Builders for Santa Clarita Homeowners
Building an accessory dwelling unit in Santa Clarita is one of the smartest ways to add square footage and rental income to your property. But if you’ve started researching, you’ve probably already hit the wall every homeowner hits: a contractor gives you a verbal ballpark, then the number moves once the plans are drawn. Benson ADU Santa Clarita does it differently than most our ADU Builders in Santa Clarita. We put the price in writing before any work starts, and we back every project with our 365-Day Done Right Promise. This is the point of the whole company. Troy Eastman runs this location, and our team has been building ADUs, home additions, and room additions since 2006 through the Relay Home Co. family. Call (661) 219-7906 and you’ll get a real person on the line, not a voicemail loop.
Key Takeaways:
- Written price before any work starts, never a verbal estimate that shifts later.
- 365-Day Done Right Promise on every ADU project, in writing.
- We build with leading prefab brands: Cover, Dvele, and Boxabl, among others.
- Background-checked, uniformed team. Live person answers 24/7.
- Free estimates. Call (661) 219-7906.
ADU Construction
ADU Construction is the full process of building an accessory dwelling unit on your Santa Clarita property from site evaluation through final inspection. You need it when you’ve decided to add a separate living space for family, a rental unit, or a home office, and you want one contractor accountable for the whole build. Benson ADU Santa Clarita handles design coordination, permitting, foundation, framing, utility connections, and finishes under one written agreement. Typical ADU construction in the Santa Clarita area runs from roughly $150,000 for a compact prefab unit to $400,000-plus for a larger site-built two-bedroom with custom finishes. The spread comes down to size, site conditions, and whether you go prefab or stick-built. Call (661) 219-7906 for a written line-item quote based on your actual property.
Prefab vs. Site-Built Construction
Prefab ADUs from brands like Boxabl and Cover arrive as factory-built modules that get assembled on your foundation. This shortens on-site construction time significantly. Site-built ADUs are framed from the ground up on your lot, which gives you full control over the floor plan but takes longer and typically costs more.
What Our Construction Team Handles
We handle the entire construction sequence: demolition if needed, grading, foundation pour, framing, roofing, electrical, plumbing, HVAC, drywall, and finish work. You get one point of contact and a written schedule with real-time updates through The Relay Visibility Guarantee.
Detached ADU
A Detached ADU is a standalone structure completely separate from your main house, typically built in the rear or side yard with its own entrance, kitchen, bathroom, and utilities. It’s the right choice in Santa Clarita when you want maximum privacy for tenants or family, or when your existing home’s footprint doesn’t easily connect to an addition. Benson ADU Santa Clarita has built detached units ranging from compact 400-square-foot studios to spacious two-bedroom layouts, and we also serve as Stevenson Ranch ADU Builders for nearby properties. Detached ADU costs in this market generally start around $180,000 for a smaller prefab unit and run to $450,000 or more for a custom site-built design with upgraded fixtures. Your written quote includes everything from permits to paint, so there are no surprise line items later. Call (661) 219-7906 to talk through what fits on your lot.
Setback and Lot Coverage Considerations
Setbacks are the minimum distances a structure must sit from your property lines. Santa Clarita lots vary widely, and your rear and side setbacks determine how large a detached unit you can build. We evaluate your survey and lot dimensions before recommending a floor plan, so you never pay for plans that won’t get permitted.
Foundation Types for Detached Units
Most detached ADUs use a slab-on-grade or raised perimeter foundation depending on soil conditions and drainage. Our team assesses the site and includes the right foundation type in your written quote. No re-quotes halfway through because the ground turned out different than expected.
JADU
A JADU, or Junior Accessory Dwelling Unit, is a smaller converted living space created entirely within the existing walls of your primary home, maxing out at 500 square feet under California rules. You need one when you want a low-cost rental or in-law space without building a new structure. JADUs in Santa Clarita typically run between $80,000 and $140,000 depending on whether the conversion needs a new kitchenette, bathroom, or separate entrance. Benson ADU Santa Clarita handles the whole conversion: framing out the interior space, adding the required separate entry, installing the efficiency kitchen, and running utilities. Because a JADU lives inside your existing home’s footprint, it usually moves through permitting faster than a detached build. Call (661) 219-7906 and we’ll walk your floor plan with you.
JADU Requirements at a Glance
California sets specific JADU standards: a maximum of 500 square feet, a separate exterior entrance, and either its own bathroom or shared access to one in the main house. A JADU also requires an efficiency kitchen with a sink, small cooking appliance, and food prep counter. We design conversions that satisfy every requirement the first time.
JADU vs. Detached ADU Cost
JADUs cost significantly less because there’s no new foundation, no new roof, and no new utility service runs. You’re essentially adding a partition wall, an exterior door, and a small kitchen inside square footage you already own. If you’re budget-driven and want rental income quickly, a JADU is often the fastest path.
ADU Plans
ADU Plans are the architectural drawings and permit documents required before any construction can legally begin on your accessory dwelling unit. You need them when you’ve decided to move forward but haven’t locked in the layout, dimensions, or permit path yet. Benson ADU Santa Clarita produces or coordinates complete plan sets that include site plans, floor plans, structural details, and title 24 energy calculations. Plan costs for ADUs in this area generally range from $5,000 to $15,000 depending on the unit’s complexity and whether you use a stock prefab design from a brand like Dvele or require fully custom drawings. Every plan set we deliver is designed to pass Santa Clarita area plan review without endless revision cycles. Call (661) 219-7906 to start with a free site evaluation.
Stock Plans vs. Custom Drawings
Stock plans from prefab manufacturers like Cover and Boxabl save significant time and money because the design has already been through engineering review. Custom plans let you shape the space around your specific lot and needs, but require more design hours. We’ll show you both options and the price difference in writing before you commit.
What’s Included in Your Plan Set
A complete set includes the site plan showing setbacks and lot coverage, floor plans, elevations, foundation details, structural calculations, and energy compliance documents. Missing pieces are what slow down permit approvals. Ours go in complete.
ADU Contractor
An ADU Contractor is the licensed professional responsible for executing your accessory dwelling unit build from permit approval through final inspection and occupancy. You need one when you want a single accountable party managing trades, schedules, inspections, and the budget. Benson ADU Santa Clarita is authorized to build with the industry’s leading prefab brands and backed by The Relay Visibility Guarantee. As your ADU contractor, we provide a written price before work starts, background-checked uniformed technicians on every job site, and real-time progress tracking through photos and digital updates. Contractor fees are typically included in your overall project quote rather than billed separately, which is how we operate. Call (661) 219-7906 and ask for Troy Eastman directly.
Why a Written Price Matters
Many contractors in this market work from verbal estimates with change orders tacked on as surprises. Our price is written, covers the full scope, and includes a 365-Day Done Right Promise. If covered work isn’t right within a full year, we make it right. Free second visit included.
Who Shows Up on Your Property
Every technician who walks onto your Santa Clarita property is background-checked and in uniform. You’ll know the name and role of each person on site before they arrive. That’s a simple standard most contractors don’t bother with, and it matters when you have trades coming and going for weeks.
ADU Design
ADU Design is the process of shaping your accessory dwelling unit’s layout, finishes, lighting, and flow before construction drawings are finalized. It’s where you make the decisions that determine how the space feels to live in and how much it costs to build. Benson ADU Santa Clarita approaches design as a collaborative process. We bring floor plan options based on your lot dimensions, your budget, and how you plan to use the unit, then we refine the details with you. Design fees typically run between $3,000 and $10,000 depending on how much customization you want beyond a stock prefab layout from Cover or Dvele. We show you real material samples and 3D renderings so you approve what you’ll actually get. Call (661) 219-7906 to start the process.
Design for Rental Income
If the ADU is going to be a rental, we design with durable finishes, simple layouts, and low-maintenance materials that hold up between tenants. You want floors that survive, not floors that photograph well once. Our recommendations come from building units that have been rented for years, not from a catalog.
Design for Family Occupancy
For parents, adult children, or extended family, we focus on accessibility, privacy, and comfort. Wider doorways, step-free entries, and sound insulation between the main house and the ADU make a real difference in daily life. These choices are easier and cheaper to make at the design stage than to retrofit later.
Backyard ADU
A Backyard ADU is a detached accessory dwelling unit built in the rear yard of your Santa Clarita property, separate from the main home and usually visible from the back porch rather than the street. It’s the most common ADU type because it maximizes privacy and keeps the main house unchanged. Benson ADU Santa Clarita has built backyard units from compact 480-square-foot studios to full two-bedroom layouts with separate laundry, and we operate as Castaic ADU Builders for homeowners in that area too. Costs for a backyard ADU in this area typically range from $170,000 to $400,000-plus depending on size, site access, and foundation requirements. We’ll walk your yard, measure the setbacks, check the access path, and give you a written quote based on what actually fits. Call (661) 219-7906 to schedule your free on-site evaluation.
Site Access and Equipment Logistics
Your backyard ADU build may require excavators, concrete trucks, or crane placement for prefab modules from Boxabl or Cover. Site access determines what equipment can reach the build zone, which affects both schedule and cost. We evaluate this before quoting so the price accounts for reality, not a best-case scenario.
Utility Runs to the Back Yard
Running water, sewer, electrical, and sometimes gas lines from the street or main house to a backyard unit is a significant cost driver. Trenching distance, soil type, and existing utility locations all matter. Our quotes include the full utility scope based on an actual site walk, not an aerial map guess.
Brands We Service
We’re authorized to build and install ADUs from Cover, Dvele, Mighty Buildings, and Boxabl. Each brand has a different strength. Cover builds precision-engineered panels that fit together quickly on site and are known for tight tolerances. Dvele produces high-performance homes with integrated smart systems and strong energy efficiency, which matters in Santa Clarita’s summer heat.
Mighty Buildings uses 3D-printed composite panels that go up fast and resist moisture and pests better than traditional wood framing. Boxabl delivers foldable modules that minimize transportation costs and arrive nearly complete. Whether you have one of these brands in mind or you’re still comparing options, we can help you sort through the real differences and get a written price for the unit you choose.
Signs You Need a Pro Right Now
- Your lot has a slope steeper than 5%. Graded or sloped lots in the Santa Clarita area complicate foundations, drainage, and utility runs. An experienced builder assesses the slope before you spend money on plans that may not work on your specific topography.
- You keep hearing conflicting advice about what’s allowed. Setback rules, lot coverage limits, and ADU size maximums have changed multiple times in recent years. If you’re getting three different answers from three different people, it’s time to work with a contractor who builds these units regularly and knows current California ADU law.
- You need rental income by a specific date. Construction timelines slip when a contractor doesn’t coordinate trades and inspections tightly. Our process includes real-time scheduling updates so you know when the unit will be ready for a tenant, and whether a JADU conversion might be faster than a detached build.
- Your existing home’s electrical panel is near capacity. Most ADUs require a dedicated electrical circuit or a panel upgrade. We assess your panel load during the free site evaluation so it’s accounted for in the written quote, not discovered mid-project.
- You’ve already received a verbal estimate that feels vague. Vague numbers stay vague until the invoice arrives. If you’re holding a verbal quote with no line items, get a second opinion in writing. You’re not obligated to build with us, but you’ll have a real document to compare against.
Our Process, Step by Step
- 1
Call and talk to a real person. When you call (661) 219-7906, a live person answers, day or night. We gather basic details about your property and schedule your free on-site evaluation at a time that works for you.
- 2
On-site evaluation and lot assessment. We walk the property, measure setbacks, check access, evaluate the existing electrical panel, and identify any grading or drainage issues. You get honest feedback about what will and won’t work on your specific lot.
- 3
Written plan options and pricing. We present your ADU options with line-item written pricing. Prefab or site-built, one bedroom or two, rental-focused or family-focused. You’ll see real numbers for each scenario before you commit to anything.
- 4
Permit plans and approval. We prepare or coordinate the complete plan set and submit for permits. You get updates at every step through our real-time tracking platform, with photos and digital invoices payable by link.
- 5
Construction, updates, and final walkthrough. Background-checked, uniformed technicians handle the build. You get before-and-after photos, progress photos during construction, and a final walkthrough. Then your 365-Day Done Right Promise goes into effect. If anything’s not right within a full year, we make it right. Free second visit included.
How Much Does ADU Builders Cost in Santa Clarita?
A typical ADU build in Santa Clarita runs between $150,000 and $400,000 depending on the unit type and scope. A JADU conversion inside your existing home is the most affordable route, typically $80,000 to $140,000. A compact detached unit from a prefab brand like Boxabl or Cover generally lands between $170,000 and $220,000. A custom site-built two-bedroom ADU with upgraded finishes can exceed $400,000. The main cost drivers are unit size, foundation type, utility trenching distance, site access for equipment, and your finish selections. The best way to avoid overpaying is to get a written line-item quote that covers the full scope, including permits, foundation, utilities, and finishes, with no change orders added after you sign. Our free estimates include the on-site evaluation and a written breakdown, so you can compare apples to apples. Call (661) 219-7906 to schedule yours.
Our Service Area Near Santa Clarita
We serve Santa Clarita and the surrounding communities, including Sylmar, San Fernando, Mission Hills, Stevenson Ranch, Porter Ranch, Castaic, Granada Hills, Chatsworth, Northridge, Winnetka, and Panorama City. If you’re looking for ADU Builders in Santa Clarita, you’re already in the right place. Homeowners in Sylmar and San Fernando often look to us for the same written-price process, and we’ve built units throughout the valley. We also offer ADU Builders in Sylmar and ADU Builders in San Fernando with the same guarantee. Our home page covers the full service area. Response times for on-site evaluations are typically within a few days of your call.
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 About ADU Builders in Santa Clarita
An ADU builder is a contractor who specializes in accessory dwelling units, which are secondary housing units built on a single-family residential lot. We handle design, permitting, construction, and final inspection for detached units, JADUs, and everything in between. Benson ADU Santa Clarita is authorized to build with leading prefab brands and backs every project with a written price and a 365-Day Done Right Promise.
A JADU conversion typically takes 3 to 5 months from start to finish. A detached prefab ADU from Cover or Boxabl usually runs 5 to 8 months depending on permitting timelines and site conditions. Custom site-built units can take 8 to 14 months. Call (661) 219-7906 and we’ll give you a realistic timeline for your specific project.
Most ADU projects in this market fall between $150,000 and $400,000, with JADU conversions starting around $80,000 and larger custom detached units exceeding $400,000. Your exact price depends on unit size, foundation type, utility runs, site access, and finishes. We provide a written line-item quote after a free on-site evaluation so you know your number before you commit.
Yes, we’re authorized to build and install ADUs from Boxabl, Cover, Dvele, and Mighty Buildings. Each brand has different strengths in cost, speed, and energy performance, and we’ll help you compare the real differences for your specific lot. Whether you already have a brand in mind or you’re just starting your research, call (661) 219-7906 for guidance.
Our live phone line is answered 24/7, every day of the year, so you can always reach a real person at (661) 219-7906. While ADU construction is a planned project rather than an emergency service, if you have an urgent question about your project or an issue during construction, a live person will take your call day or night. No voicemail loops, no waiting until Monday.
Every project includes our 365-Day Done Right Promise. If covered work isn’t right within a full year after completion, we make it right, backed by a written guarantee stamped on every project. That promise includes a free second visit if any covered repair fails. We put it in writing before work starts, not as an afterthought during the sales conversation.
Have a general idea of how you want to use the unit: rental income, family housing, or a workspace. Know roughly what your budget range is, and clear access to the backyard if you’re considering a detached build. We handle the rest during the free on-site evaluation, including setback measurements, panel load assessment, and utility access review. Call (661) 219-7906 to schedule your visit.
Schedule Your ADU Builders Service in Santa Clarita Today
Call (661) 219-7906 to schedule your free on-site evaluation and get a written price before any work starts. Troy Eastman and the Benson ADU Santa Clarita team are ready to walk your property, answer your questions, and put the numbers in writing. No obligation, no pressure. Just a real plan and a real price.
Written by Troy Eastman, Owner at Benson ADU Santa Clarita, serving Santa Clarita and surrounding communities since 2006.
