A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Granada Hills, CA
Granada Hills is one of the San Fernando Valley’s most ADU-ready communities, with 1950s and 60s ranch homes sitting on lots large enough for a real backyard dwelling. The catch is what sits under those lots: expansive soils and a history of liquefaction mean deeper foundations and soil reports most neighboring cities never require. We’re a full-service ADU company serving Granada Hills with written pricing before any work starts, and a 365-Day Done Right Promise on every project. Call (661) 362-8059 to talk through your lot.
Why Granada Hills Homes Are Different
Most Granada Hills homes were built between 1950 and 1965: single-story, wood-framed, on original concrete slabs. That housing stock is friendly to backyard ADUs in one way (large R-1 lots, usually 7,000 square feet or more) and demanding in another. Many of those original slabs were never engineered for the soil movement common here, so a detached ADU often means a deeper footing than the house itself required sixty years ago.
The terrain adds another layer. North of Rinaldi, the subtle slopes trigger a hillside grading review that flatland areas like Northridge rarely see. It is not a dealbreaker, but it adds two to four weeks to permitting and changes how we lay out drainage. The Valley’s hot, dry summers and occasional heavy winter rain also shape the work: high-efficiency cooling is non-negotiable, and any ADU in Granada Hills needs drainage designed for soil that swells when it finally gets wet.
None of this should scare a homeowner away. It means the contractor matters more here than in most zip codes. The right team knows which lots will need a soils report, which can move forward with standard setbacks, and how to keep a Granada Hills project moving through the city’s review without surprises.
Our Main Granada Hills Services
Granada Hills homeowners call us most often for three things: building a new backyard ADU, converting an underused garage, and extending the footprint of the original house. Each has its own Granada Hills page with local pricing and specifics.
Home Addition Contractor in Granada Hills
A home addition on a Granada Hills ranch usually means extending sideways or adding a second story over a section of the original footprint. The 1960s framing is generally sound, but tying a new foundation into an old slab on expansive soil takes careful detailing to avoid differential settling. We handle the structural engineering, the seismic upgrades most older Granada Hills homes need before an addition, and the day-to-day protection of the rooms your family still lives in. Crews work with shoe covers, drop cloths, and quiet tools near bedrooms, and you get a photo of the clean-up before the crew leaves each day. Home Addition Contractor in Granada Hills
Garage Conversion Contractor in Granada Hills
Granada Hills has thousands of attached garages built for one-car families in the 1950s and 60s. Converting one into a living space often triggers insulation upgrades, drywall, electrical, and a new floor assembly over that original slab. Because many Granada Hills garages sit lower than the main house, drainage and moisture control are the two details we watch most closely. A converted garage works well as a small rental unit, a home office, or a ground-floor bedroom for aging parents. We pull the permits, pass the inspections, and leave you with a written price before the first tool comes off the truck. Garage Conversion Contractor in Granada Hills
ADU Builders in Granada Hills
A detached ADU in Granada Hills usually lands between 400 and 1,200 square feet in a backyard that already has room for it. The foundation work is the part most out-of-area builders underestimate; expansive soils and hillside review requirements north of Rinaldi mean soil reports and deeper footings are common. We build stick-framed ADUs and also work with prefab and modular systems from Dvele, Mighty Buildings, and Boxabl when a Granada Hills lot suits panelized or factory-built construction. Every ADU gets a written price up front and the 365-Day Done Right Promise. ADU Builders in Granada Hills
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 Granada Hills
Granada Hills homeowners researching ADUs often ask about Dvele, Mighty Buildings, and Boxabl before they call any builder. We work with those systems directly, along with Plant Prefab, and can help you compare them against a stick-built ADU on your specific lot. Parts and material lead times vary by brand; see our brands page for what each system offers.
Pricing for ADU Company in Granada Hills, CA
| Service | Typical range in Granada Hills |
|---|---|
| Detached ADU (400 – 800 sq ft, stick-built) | $180,000 – $310,000 |
| Detached ADU (800 – 1,200 sq ft, stick-built) | $290,000 – $450,000 |
| Prefab / modular ADU (Dvele, Boxabl, Mighty Buildings) | $160,000 – $380,000 |
| Garage conversion (attached, 400 – 500 sq ft) | $95,000 – $160,000 |
| Garage conversion (detached, 400 – 500 sq ft) | $110,000 – $175,000 |
| Home addition (300 – 600 sq ft) | $140,000 – $260,000 |
| Home addition (600 – 1,000 sq ft) | $250,000 – $420,000 |
| Foundation upgrade / seismic retrofit (on existing slab) | $12,000 – $35,000 |
| Soils report and grading plan (when required) | $3,500 – $8,000 |
In Granada Hills, the two biggest price movers are soils and slope. A lot north of Rinaldi that triggers a hillside grading review will land on the higher end of any range above, and so will a house that needs a seismic retrofit before an addition or ADU can tie into it. Every project gets a written price before work begins, with no surprise line items added after crews arrive.
Neighborhoods We Serve in Granada Hills
We work throughout Granada Hills, from the older ranch blocks south of Chatsworth Street to the larger lots north of Rinaldi where hillside review is more common. Our crews know the difference between a flatland lot near Balboa and a sloped one up toward O’Melveny Park, and we schedule accordingly.
- North of Rinaldi (O’Melveny Park area)
- South of Chatsworth Street
- Balboa Highlands
- Knollwood
- West of Zelzah Avenue
Most Granada Hills estimates happen within a few days of your call, and we work around school schedules when we can.
Service Area – Cities Near Granada Hills
Granada Hills sits at the northern edge of the San Fernando Valley, and our crews also serve the surrounding communities. If you live in Mission Hills, CA, San Fernando, CA, Northridge, CA, or Sylmar, CA, we can help with the same written pricing and the same 365-Day Done Right Promise.
Serving Granada Hills, CA - Our Local Coverage Area
We’re based in the Granada 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 Granada Hills
Not always, but often. The city’s history of liquefaction and expansive soils means many Granada Hills ADU permits require a soils report, especially north of Rinaldi where hillside grading review applies. Flat lots south of Chatsworth sometimes skip it. We will tell you during the estimate. Call (661) 362-8059 to find out what your lot needs.
Standard ADU permits in Granada Hills run three to five months, but lots north of Rinaldi can add two to four weeks for hillside grading review. We handle the full permit package and track every review cycle for you. Call (661) 362-8059 and we will give you a realistic timeline for your street.
Yes, and it is written into our Cedarwell Care Promise: shoe covers and drop cloths inside the home, pet-safe products where there is a choice, quiet tools near bedrooms, and a photo of the clean-up before the crew leaves each day. Your family lives in the house while we build the ADU, and we work like we know that. Call (661) 362-8059 for a free estimate.
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 Granada Hills Customers Say
"Garage to studio conversion with us living right there. They sealed off the dust, cleaned up daily, and respected our quiet hours. No surprise costs. Beautiful."
- Terrence Boylan"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
