A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Sylmar, CA
Adding an ADU to a Sylmar property means building on large lots with older 1950s – 1970s ranch homes, under seismic and fire codes shaped by the 1994 Northridge earthquake and Santa Ana wind exposure. It’s a different job than in flatland neighborhoods to the south. We’re Seedling ADU Builders, and we handle ADUs, garage conversions, and home additions for Sylmar homeowners with written pricing before any work starts and a 365-Day Done Right Promise on every completed project. Call (661) 362-8059 for a free estimate.
Why Sylmar Homes Are Different
Sylmar’s housing stock skews toward single-story ranch homes built between the 1950s and 1970s, set on lots that are larger than most of the San Fernando Valley. Many of those properties still have their original electrical panels and cast-iron plumbing. Before we frame anything, we’re usually upgrading the panel to 200 amps and replacing portions of the drain line – not because the inspector likes paperwork, but because an ADU with a mini-split, a kitchen, and a washer/dryer will trip an old 100-amp panel within the first summer.
The 1994 Northridge earthquake reshaped how Sylmar builds. ADUs here must meet foundation and shear-wall standards that are stricter than in neighboring flatland cities, and we design every Sylmar project around that from day one. Summer temperatures routinely pass 100°F, so we specify higher R-value insulation, heat-reflective roofing, and cooling equipment sized for the valley’s worst weeks – not the mildest ones. North of Foothill Boulevard, equine overlay rules add another layer: setbacks from corrals, dust-control measures during grading, and a site plan that respects the horse traffic next door.
None of this is a surprise to us, and it shouldn’t be a surprise to you. These are the conditions we plan for in every Sylmar estimate, and they’re written into the price before anyone picks up a tool.
Our Main Sylmar Services
Most Sylmar homeowners call us for one of three projects: expanding the footprint of their existing home, converting a detached garage into living space, or building a new ADU from the ground up. Each has its own dedicated Sylmar page below with local detail and pricing.
Home Addition Contractor in Sylmar
Adding onto a Sylmar ranch home often means matching rooflines, extending slab foundations on soil that has settled for 50-plus years, and bringing the entire electrical and plumbing system up to current code. The heat is a real factor here: we size the addition’s cooling and insulation for triple-digit afternoons, not for a coastal afternoon. If the addition is near a bedroom, we schedule loud work after school hours and keep the job site clean at the end of every workday. Home Addition Contractor in Sylmar
Garage Conversion Contractor in Sylmar
Sylmar’s detached garages from the 1960s and 1970s were built for cars, not for people. That means raising floor height to meet living-space requirements, adding insulation to walls built with none, and often replacing the slab where old concrete has cracked from decades of valley heat. Cast-iron plumbing replacement is common on these jobs, and we handle it before drywall ever goes up. The good news: a detached garage conversion keeps construction noise and dust out of the main house entirely. Garage Conversion Contractor in Sylmar
ADU Builders in Sylmar
A new ADU on a Sylmar lot means building to current seismic and fire-resistant standards from the foundation up. Large-lot R-1 zoning gives you room for a generous footprint or even a two-story build, which is a real advantage here. We work with trusted prefab and modular brands like Cover, Dvele, and Mighty Buildings when a factory-built structure fits the lot and schedule better than stick framing, and we give you a written side-by-side so the choice is yours. ADU Builders in Sylmar
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 Sylmar
We work with the brands Sylmar homeowners research most: Cover, Dvele, Mighty Buildings, and Boxabl. Parts and panels are ordered to the specific floorplan, not inventoried in a warehouse, so lead times are honest from the first conversation. See our brands for the full list.
Pricing for ADU Company in Sylmar, CA
| Service | Typical range in Sylmar |
|---|---|
| Detached ADU (1 bed, 1 bath) | $180,000 – $280,000 |
| Detached ADU (2 bed, 2 bath) | $260,000 – $380,000 |
| Garage conversion (studio) | $95,000 – $150,000 |
| Garage conversion (1 bed, 1 bath) | $120,000 – $185,000 |
| Home addition (primary suite) | $140,000 – $220,000 |
| Home addition (family room extension) | $110,000 – $190,000 |
| Electrical panel upgrade to 200A | $3,500 – $6,500 |
| Cast-iron plumbing replacement (main line) | $7,000 – $18,000 |
| Foundation seismic retrofit (pre-build) | $12,000 – $35,000 |
| Fire-resistant roofing upgrade | $14,000 – $32,000 |
Prices in Sylmar climb when a property needs a full panel and plumbing replacement, when the lot sits in a hillside or equine overlay zone with extra setback and grading costs, or when the seismic retrofit scope is larger than a straightforward shear-wall package. Every Seedling quote is written, line-itemed, and fixed before work starts – no surprise line items after the crew arrives.
Neighborhoods We Serve in Sylmar
We work across Sylmar, from the equestrian properties north of Foothill Boulevard to the denser blocks south of the 210. Our crews live in the valley and know these streets, which means permits, inspections, and material deliveries don’t slow down the project.
- Rancho Cascades
- Lake View Terrace (Sylmar side)
- Hubbard
- Pacoima Hills
- North Sylmar (equestrian zone)
For most Sylmar addresses, we can have someone out for a free estimate within a few business days. Call (661) 362-8059 and a live person will answer.
Service Area – Cities Near Sylmar
In addition to Sylmar, our crews regularly serve the neighboring communities of San Fernando, CA, Mission Hills, CA, Granada Hills, CA, and Panorama City, CA. Dispatch and scheduling are coordinated from our Los Angeles office, and the crews on your Sylmar job are local valley teams.
Serving Sylmar, CA - Our Local Coverage Area
We’re based in the Sylmar 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 Sylmar
Most Sylmar ADUs run 9 to 14 months from design to final inspection. Projects in the equine overlay zone north of Foothill Boulevard can take a few weeks longer due to additional plan review and dust-control requirements. We give you a written schedule at the start, and we update it every week. Call (661) 362-8059 to discuss your timeline.
Yes. Sylmar ADUs must meet post-Northridge earthquake foundation and shear-wall standards, plus fire-resistant construction codes due to Santa Ana wind exposure. Homes north of Foothill Boulevard may also need equine overlay review, including setbacks from corrals. We handle all permits and inspections as part of the project. Call (661) 362-8059 for specifics on your lot.
Yes, and it should be in your spec regardless of what builder you choose. We use higher R-value insulation, heat-reflective roofing materials, and cooling equipment sized for sustained 100°F-plus weeks – not average valley temperatures. This matters in Sylmar, where July and August test a home’s efficiency every single afternoon. Call (661) 362-8059 to see it written into your 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 Sylmar Customers Say
"They converted our garage and were so mindful that we were living right there through it. Quiet hours respected, site swept, nothing left out where the kids play. Lovely work."
- Eugene Park"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
