A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Mission Hills, CA
Adding an ADU in Mission Hills, CA means building on lots where a 1920s Craftsman sits on a slope steep enough that the rear property line may be fifteen feet above the street. That changes everything: foundation design, drainage, how materials get delivered, and how the final structure meets the hillside. We’re Seedling ADU Santa Clarita, and we build accessory dwelling units, garage conversions, and home additions here with written pricing before any work begins, a 365-Day Done Right Promise on every completed job, and a crew that follows the Cedarwell Care Promise inside your home. Call (661) 362-8059 to talk through your lot.
Why Mission Hills Homes Are Different
Mission Hills sits in the northeast corner of the San Fernando Valley, and the housing stock reflects its early-20th-century roots. Most homes along Devonshire Street, Sepulveda Boulevard, and the streets climbing toward the San Fernando Mission are Craftsman, Spanish Colonial Revival, or Mission Revival builds from the 1910s through the 1930s. These homes were framed with old-growth lumber and set on foundations that predate modern seismic code, which matters the moment you attach new square footage. On many Mission Hills hillside properties, the lot slopes so sharply that an ADU’s foundation has to be engineered as a retaining element in its own right, not just a slab on grade.
The climate shapes the work too. Hot, dry summers and mild, wet winters mean insulation and passive cooling are not optional upgrades here, they’re what keeps an ADU livable from July through September. Santa Ana winds funnel through the canyons and hit hillside homes with gusts that test window flashing and roof details. We plan for that from the first site visit: wind-resistant window placement, drainage that moves water away from the hillside instead of into it, and materials that hold up under direct summer sun. Detached garages from the 1920s and 1930s, often tucked at the rear of a lot against the hillside, are the most common conversion candidates we see in Mission Hills, and most need seismic retrofitting and a new foundation before the walls are worth saving.
Our Main Mission Hills Services
Three services cover what Mission Hills homeowners ask us for most: home additions that preserve the original home’s character, garage conversions that turn old hillside structures into livable space, and full ADU builds designed for the specific conditions of your lot. Each service has its own Mission Hills page that goes deeper into pricing, process, and what to expect.
Home Addition Contractor in Mission Hills
A home addition in Mission Hills is rarely a simple bump-out. The original home’s roofline, the slope of the lot, and the need to match 1920s architectural detailing all shape the design. We protect the existing floors and air inside your home while we work: shoe covers and drop cloths on every visit, a clean-up photo before the crew leaves each day, and written pricing locked in before the first tool comes off the truck. Whether you’re adding a primary suite, a family room, or a second story, the goal is an addition that feels like it was always part of the house. See Home Addition Contractor in Mission Hills for full details on pricing and process.
Garage Conversion Contractor in Mission Hills
Mission Hills has a lot of detached garages from the 1920s and 1930s, many of them built against the hillside at the rear of the lot. Converting one means dealing with foundations that often have no modern footings, drainage that may currently run toward the structure, and electrical service that needs a full rework. We handle the seismic retrofit, the foundation upgrade, the insulation, and the finish work, and you get a written price for all of it before we start. Families with kids and pets know who’s on site: background-checked, uniformed technicians using pet-safe products where there’s a choice. See Garage Conversion Contractor in Mission Hills for a full breakdown.
ADU Builders in Mission Hills
A new detached ADU in Mission Hills is a small home on your lot, and on a steep parcel that means thinking about how it sits on the hill, how it drains, and how it protects the view you already have. We work with homeowners who want a custom build and those who prefer a prefab approach, and we have hands-on access to brands like Cover, Dvele, and Mighty Buildings so you’re choosing the right product for your lot, not just what a builder prefers to sell. Every ADU gets the same written price upfront and the same 365-Day Done Right Promise. See ADU Builders in Mission Hills for the full picture.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Mission Hills
We work directly with prefab and modular ADU brands including Cover, Dvele, and Boxabl, so Mission Hills homeowners have real choices when it comes to how their ADU gets built. Each brand has different lead times, foundation requirements, and site constraints, and we help you sort through which one fits your lot. Visit our brands page to see the full list.
Pricing for ADU Company in Mission Hills, CA
| Service | Typical range in Mission Hills |
|---|---|
| Detached ADU (custom build, one bedroom) | $180,000 – $300,000 |
| Detached ADU (prefab or modular, one bedroom) | $140,000 – $220,000 |
| Detached ADU (two bedroom, custom) | $240,000 – $400,000 |
| Junior ADU (interior conversion) | $80,000 – $140,000 |
| Garage conversion to ADU | $120,000 – $200,000 |
| Garage conversion (basic finish, no plumbing) | $45,000 – $85,000 |
| Home addition (primary suite, ground level) | $150,000 – $260,000 |
| Home addition (second story) | $250,000 – $450,000 |
| Foundation upgrade or replacement (existing garage) | $25,000 – $60,000 |
| Seismic retrofit (existing garage or older structure) | $8,000 – $20,000 |
Hillside lots in Mission Hills push prices higher than flat-lot builds in other parts of the Valley. Steeper slopes mean deeper foundations, more drainage work, and sometimes engineered retaining walls before the ADU itself goes up. You’ll get a written price for the full scope before any work starts, and that price doesn’t change once crews arrive unless you change the scope.
Neighborhoods We Serve in Mission Hills
We work across Mission Hills, from the flats near Sepulveda and Devonshire up into the hillside streets that climb toward the San Fernando Mission. Response times are typically one to two business days for a site visit.
- The streets north of Devonshire, including the hillside enclaves near Brand Park
- The historic core around the San Fernando Mission
- West Mission Hills near the Bull Creek corridor
- The mid-century pockets south of San Fernando Mission Road
Service Area – Cities Near Mission Hills
We also serve families in nearby communities across the northeast San Fernando Valley. If you’re just outside Mission Hills, our crews work in San Fernando, CA, Granada Hills, CA, Panorama City, CA, and Sylmar, CA. Dispatch and scheduling are coordinated from the brand’s Los Angeles office, and crews serve Mission Hills locally.
Serving Mission Hills, CA - Our Local Coverage Area
We’re based in the Mission Hills area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in Mission Hills
We schedule site visits across Mission Hills within one to two business days, usually faster for hillside lots where a structural question needs an answer before design work can begin. Call (661) 362-8059 and a live person will put you on the calendar.
Yes, portions of Mission Hills fall under historic preservation guidelines, and hillside development rules add engineering reviews for slope stability, drainage, and view protection. We handle the permit package and the engineering, and we pull permits and pass inspections on every job. The written price you receive includes the permit process.
No. You receive a written price for the full scope before any work begins, and that price holds unless you ask us to change the scope. On hillside lots, the price includes the foundation, drainage, and engineering work specific to your property. Call (661) 362-8059 for an exact quote on your lot.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Mission Hills Customers Say
"Built a backyard unit for us. For a months long project the crew kept the site remarkably tidy, swept daily, and were respectful of our neighbors and our dog. Beautiful result."
- Charlotte Vey"Careful builders who treated our home like we still had to live in it, because we did. Dust controlled, driveway swept nightly, and the finished ADU is beautiful. No surprise costs either."
- Rick Abara"Backyard cottage build. For a long project they kept the site remarkably tidy and were respectful of our neighbors and our dog. Swept the driveway every evening."
- Leona Pfeiffer
