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
Sylmar sits in the northeast corner of the San Fernando Valley, where ranch-style homes from the 1950s through the 1970s still dominate wide, flat lots. That housing stock matters for ADU work: most of these properties have original slab foundations, stucco exteriors, and electrical panels that were sized for a much simpler era. Adding an ADU here usually means upgrading the panel and sewer lateral before framing starts. Benson ADU Builders handles that upfront, in writing, with a price you see before any work begins. Call (661) 219-7906 to talk through your lot.
Why Sylmar Homes Are Different
Sylmar is one of the hottest neighborhoods in the Valley, regularly crossing 100°F in summer. An ADU here has to be designed for that heat from day one: high-grade insulation, properly sized HVAC, and fire-resistant materials because wildfire zones sit close to many streets. A cheap build with standard insulation will punish the occupants every August. We spec for Sylmar’s actual climate, not a generic Southern California average.
The other thing that sets Sylmar apart is the lot itself. Many properties carry equestrian zoning, which means ADU placement has to account for horse access, dust, and keeping animals separated from living space. It also means setbacks sometimes shift based on stable locations and corral lines. Combined with the fact that Sylmar still has some of the largest single-family lots in Los Angeles, most projects here end up being genuinely site-specific. That’s why we walk every lot before quoting, and why our written price reflects what’s actually there, not a template.
Our Main Sylmar Services
Most Sylmar homeowners call us about one of three things: building a new ADU from the ground up, extending the original home’s footprint, or adding a single room. Here’s how each works here.
ADU Builders in Sylmar
Sylmar’s large lots make it one of the few places in Los Angeles where a detached ADU can comfortably reach 1,000 square feet or more. We build with prefab systems from brands like Cover and Dvele, which means faster framing and less disruption on your property. Before we quote, we check your panel capacity, sewer lateral condition, and equestrian setbacks if your lot has them. Every one of those items affects the final price. ADU Builders in Sylmar covers the full build process, from first survey to final inspection.
Home Addition Contractor in Sylmar
Adding square footage to a 1960s Sylmar ranch usually means matching rooflines, extending the slab, and bringing the new section’s insulation well past what the original builders used. We’re a Home Addition Contractor in Sylmar that handles the engineering, permits, and the build itself. If your addition triggers a panel upgrade or sewer lateral replacement, that’s included in the written price from the start, not billed as a surprise later.
Room Addition Contractor in Sylmar
A single room addition, like a primary suite or a home office, still has to meet Sylmar’s heat and fire-safety standards. We treat a 200-square-foot room with the same insulation and material care as a full ADU. As your Room Addition Contractor in Sylmar, we’ll confirm your foundation can carry the new load and that the existing HVAC can handle the added space before we quote a fixed price.
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 build with prefab ADU systems from Cover, Dvele, Mighty Buildings, and Boxabl, plus James Hardie cladding for fire-resistant exteriors. These are names you can look up yourself, and that’s the point: you shouldn’t have to trust a verbal promise about materials. See our brands for the full list and what each offers.
Pricing for ADU Company in Sylmar, CA
| Service | Typical range in Sylmar |
|---|---|
| Detached ADU (site-built, 400 – 600 sq ft) | $180,000 – $260,000 |
| Detached ADU (prefab, 400 – 600 sq ft) | $150,000 – $220,000 |
| Detached ADU (site-built, 600 – 1,000 sq ft) | $250,000 – $380,000 |
| Detached ADU (prefab, 600 – 1,000 sq ft) | $200,000 – $320,000 |
| Garage conversion ADU | $90,000 – $160,000 |
| JADU (Junior ADU, attached) | $75,000 – $130,000 |
| Home addition (ground-up, 200 – 400 sq ft) | $80,000 – $160,000 |
| Home addition (ground-up, 400 – 800 sq ft) | $150,000 – $300,000 |
| Room addition (single room, 150 – 250 sq ft) | $55,000 – $110,000 |
| Electrical panel upgrade (if required) | $3,500 – $6,000 |
| Sewer lateral replacement (if required) | $6,000 – $15,000 |
What pushes a Sylmar price toward the top of these ranges is usually the lot’s equestrian layout, the age of the existing electrical system, and the distance from the ADU site to the sewer line. Every Benson quote includes the panel and lateral work if it’s needed, so the number you sign on is the number you pay. No change orders for conditions we could have seen on day one.
Neighborhoods We Serve in Sylmar
We work across Sylmar, from the hillside pockets near Veterans Memorial Park down to the flat ranch tracts along Foothill Boulevard and Glenoaks. Dispatched from the Los Angeles office, our crews serve the whole Sylmar area with the same written-price process.
- Rancho Cascades
- Lake View Terrace border
- North Sylmar (horse-zoned lots)
- Central Sylmar near El Cariso Park
- Sylmar foothills off Little Tujunga Canyon
Service Area – Cities Near Sylmar
If you’re close to the Sylmar line, we also cover San Fernando, CA, Mission Hills, CA, Granada Hills, CA, and Panorama City, CA. The same written price and 365-Day Done Right Promise applies in every city.
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
Yes. If your lot has horse zoning, setbacks and placement may shift based on stable locations and corral access. We measure everything before quoting, so the written price already accounts for any equestrian constraints on your Sylmar property. Call (661) 219-7906 and we’ll confirm what applies to your lot.
Most Sylmar ADUs run 6 to 10 months from permit submittal to final inspection, depending on utility upgrades and prefab versus site-built. We’ll give you a timeline in writing along with the price, based on your actual lot conditions, not a generic estimate.
Yes. We prepare and submit the plans, pull permits, and manage inspections through closeout. You’ll see the permit fees listed on your written quote before you sign. Call (661) 219-7906 for a free estimate on your specific Sylmar property.
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
"Home addition blends in with the original house."
- Vic S."Fixed quote and clear change orders approved by text."
- Trina M."Photos of each milestone, which I loved. Slab, framing, roof dry-in, each one came with a few pictures by text."
- Gwen D.
