A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable ADU Builders Across Panorama City
Building an ADU in Panorama City almost always means working with the bones of a 1940s or 1950s ranch home: original 100-amp panels, concrete slabs without vapor barriers, and small lots on a tight grid. That’s the reality our ADU Builders team plans for from the first site visit, not after the inspector shows up. We scope every Panorama City project with those infrastructure upgrades priced in writing before you sign anything. Call (661) 219-7906 for a free estimate, and we’ll walk your lot with you, flag what the county will flag, and give you a real number.
Why Benson ADU Santa Clarita Is Panorama City’s Preferred ADU Builders Company
Panorama City homeowners keep calling us because we treat the 1950s-era electrical panel as part of the ADU quote, not a surprise line item at rough-in. That panel upgrade, the galvanized supply line, the slab moisture test – these are known costs here, and our written price accounts for them before work starts. Troy Eastman leads our crews, and he’s the one who walks the property on day one, measuring the garage footing and checking the service amperage in person.
On Chase Street, our crew converted a 1952 detached garage with a low-pitched gable roof and exposed rafter tails into a 490-square-foot ADU. The original concrete slab lacked a vapor barrier, so we installed a raised engineered wood floor and sealed the perimeter, then upgraded the 100-amp panel to 200 amps and replaced the galvanized supply line to the main. The result passed county inspection on the first try. That’s the kind of job we do repeatedly across Panorama City, and we’ve built our local reputation on getting those infrastructure details right the first time.
Every technician who steps onto your Panorama City property is background-checked and in uniform. You’ll always know who is walking up your driveway. And when you call (661) 219-7906, a live person answers – no voicemail loop, no call center script, no waiting until Monday.
Detached ADU in Panorama City
A detached ADU in Panorama City typically means converting a 1950s detached garage or building new in the rear setback of a small lot. Depending on whether you are converting an existing garage or building from the ground up, a Panorama City detached ADU generally runs $210,000 to $395,000. That range includes the structural work, the mandatory panel upgrade from 100 to 200 amps, insulation, drywall, a full kitchen and bath, and county permit fees. A garage conversion on the original slab sits at the lower end. A new build on a fresh foundation with upgraded seismic ties sits at the higher end.
Garage Conversion Reality Check
The original 1950s garage slab in Panorama City almost never has a vapor barrier underneath. That means groundwater wicks through the concrete and will buckle any flooring you lay directly on top. We test the slab for moisture first. If it fails, we install a raised engineered wood floor or pour a new slab with a barrier and perimeter seal. That’s a line item on your written quote, not an argument after the fact.
Setback and Footing Scope
On a standard 50-foot-wide Panorama City lot, the rear setback is usually four feet. That shapes how wide your detached ADU can be and where the entrance goes. We pull the county plat map, measure the actual setback from the fence line, and size the ADU footprint before we quote. No guessing, no change orders after demo day.
JADU in Panorama City
A JADU in Panorama City is a junior accessory dwelling unit built within the existing footprint of the house, typically by converting an attached garage or carving out a bedroom wing with its own entrance and a small kitchenette. In a Panorama City home on a 5,000-square-foot lot where the detached garage already exists, a JADU is often the most cost-efficient path: expect $95,000 to $170,000. That range covers the wall separation, soundproofing, a compact kitchen with a two-burner cooktop, the new entrance, and the panel or subpanel work the county will require.
Panel Capacity First
The first question on any Panorama City JADU is the electrical panel. Most original panels here are 100 amps, and a JADU with a cooktop and a mini-split pulls that close to the limit. We may not need a full 200-amp service upgrade for a smaller JADU, but we will likely add a subpanel and dedicated circuits. We test the actual load and put the answer in writing before you commit.
Separate Address, Shared Lot
A JADU shares the main house’s address and sewer line, which means less trenching and lower permit fees than a detached unit. That’s a real savings on Panorama City lots where the sewer lateral runs straight from the house to the street. We verify the lateral condition during the site walk. An old cast iron lateral that’s already failing can add $8,000 to $15,000 to the job, and we’d rather tell you that before the quote than during the dig.
Trusted Brands We Service in Panorama City
We are authorized to build with specific prefab and materials brands so you can research exactly what goes into your Panorama City ADU before you pay for it. That includes Mighty Buildings for their prefabricated panel systems, Boxabl for compact factory-built units that work well on smaller lots, and Tuff Shed structures that we can finish out as a permitted ADU with insulation, electrical, and plumbing. For Panorama City’s climate, we also recommend Plant Prefab panels paired with fire-resistant cladding, which matters during Santa Ana wind season. Because we have direct relationships with these manufacturers, we can often get faster lead times for Panorama City projects than a site-built-only contractor quoting frame-from-scratch. Your written quote names the brand, the model, and the delivered price. Call (661) 219-7906 and we’ll show you the options side by side.
Common ADU Builders Problems We See in Panorama City Homes
- 100-amp panel red-tagged at rough-in. The original electrical service on a 1950s Panorama City home was designed for lights, a fridge, and a window AC. Add an ADU with a kitchen, laundry, and a mini-split, and the inspector will not pass rough-in without a service upgrade. We price that upgrade in the quote, not as a surprise after you’ve already paid for framing.
- Original garage slab with no vapor barrier. We’ve pulled flooring out of Panorama City garage conversions and found moisture migrating straight through the concrete. If the slab is not sealed or isolated, the new ADU floor will cup, buckle, or grow mold within a season. We test first and build accordingly.
- Galvanized supply lines failing under the new load. The original galvanized water lines in many Panorama City homes are corroding internally after 70 years of Valley water. Adding a full ADU bathroom and kitchen to that line can drop water pressure throughout the house. We replace the branch line feeding the ADU with PEX and often the service line to the main.
- Santa Ana wind exposure on the rear lot line. Panorama City backs up against open valley wind corridors. A detached ADU at the rear of the lot takes the full force of a Santa Ana event. We spec fire-resistant cladding and wind-rated roof anchoring as standard on detached units here, not as an upgrade.
Pricing for ADU Builders in Panorama City, CA
Here’s the honest ballpark for ADU construction in Panorama City. A detached garage-conversion ADU runs $210,000 to $310,000 depending on the condition of the slab and the service line. A site-built detached ADU on a new foundation runs $330,000 to $395,000. A JADU within the home’s footprint runs $95,000 to $170,000. What moves the number: the panel upgrade (we almost always quote a 200-amp service for detached units, around $4,000 to $6,000 of the total), the slab moisture test and any raised floor work, and the sewer lateral condition if we are adding a full bath. Your written quote from us includes all of that. Call (661) 219-7906 and we will inspect your specific lot, measure the garage, test the panel, and hand you a line-item price that holds.
We Also Serve Cities Near Panorama City
Our crews work throughout the San Fernando Valley and the surrounding foothills. We regularly take ADU projects in Mission Hills, San Fernando, Granada Hills, and Sylmar. Wherever your property is, the same written-price-before-work rule applies. If you are in a neighboring city with an older ranch or a hillside lot, call us and we’ll tell you straight what the scope looks like.
Serving Panorama City, CA - Our Local Coverage Area
We’re based in the Panorama City 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 Builders in Panorama City
Yes, in nearly every case. The original 100-amp panels in Panorama City’s post-war ranch homes cannot safely carry the additional load of a full ADU with its own kitchen, bathroom, and HVAC. The county inspector will require a 200-amp service upgrade before passing rough-in, which typically adds $4,000 to $6,000 to the total project cost. We include this in every detached ADU quote for Panorama City so it’s never a surprise. Call (661) 219-7906 for an exact number on your home’s panel.
Not always, but you do need to address the moisture. A 1950s slab in Panorama City usually sits directly on soil with no plastic barrier below, which means groundwater will wick up through the concrete and into your new flooring. We test the slab first. If moisture levels are acceptable, we seal the perimeter and install a vapor-blocking underlayment. If the slab is saturated or badly cracked, we either pour a new slab with a vapor barrier or install a raised engineered wood floor. Either way, the fix is priced in your written quote.
Yes, the rare acreage lot in the county jurisdiction surrounding Panorama City has real setbacks for septic and well clearance. A detached ADU must maintain the county’s required distance from both the septic tank, leach field, and any potable well, or plan check will fail on the first submittal. We locate the well and septic system during the initial site walk, pull the county’s setback requirements, and design the ADU placement to pass plan check without a redesign fee. Call (661) 219-7906 with your parcel number and we’ll pull the records before you spend a dime.
Santa Ana winds push dry air through the Valley at 40 to 60 miles per hour, and embers travel far ahead of any fire line. For a detached ADU at the rear of a Panorama City lot, we spec fire-resistant cladding such as fiber cement, ember-resistant vents, and double-pane tempered glazing on the windward side. These materials cost more than basic stucco or vinyl, but they’re the right call for a structure that will sit exposed to seasonal wind events for decades. We include fire-resistant materials in our standard Panorama City detached ADU proposals rather than selling them as an add-on.
Yes. Panorama City regularly hits 95 to 100 plus degrees in July and August, and a garage conversion without its own cooling becomes unusable. We spec a ductless mini-split heat pump sized to the ADU’s square footage, which provides both cooling for the Valley summers and efficient heating for the mild winters. It runs on its own circuit, off the new or upgraded panel. The system is included in every detached and JADU quote we give in Panorama City.
If you’re ready to see real numbers for your Panorama City ADU, call (661) 219-7906 and ask for a free site walk. We’ll test the slab, check the panel, measure the setback, and hand you a written line-item price that stands up to county inspection.
Written by Troy Eastman, Owner at Benson ADU Santa Clarita. We build ADUs the way we’d want them built on our own street – priced in writing, inspected honestly, and backed for a full year.
