ADU Company in Downey, CA
We’re Lodgewick ADU Builders, the ADU company of the Kingswell family. If you’re researching an accessory dwelling unit (ADU – a second, smaller home built on the same lot as your main house) in Downey, you’re likely on a 1950s or 60s ranch lot with more backyard than you think, and you want to know what it costs and whether it’ll actually get through the city. A detached backyard ADU in Downey typically runs $180,000 – $320,000, while a garage conversion usually lands between $90,000 and $150,000. The big Downey-specific line item is electrical: most original 100-amp panels here need upgrading to 200 amps before Building and Safety signs off. Call (254) 602-5618 and we’ll walk you through what applies to your lot.
Why Downey Homes Are Different
Downey’s housing stock didn’t trickle in over a century. The city was built in a concentrated 1950s – 1970s boom to house aerospace workers from North American Aviation and later Rockwell International. That’s why so many streets, from the neighborhoods south of Firestone Boulevard up through the tracts near Apollo Park, are lined with owner-occupied single-story ranches, most with attached two-car garages and slab-on-grade foundations.
Those lots are deeper than what you’ll find in nearby Lynwood or South Gate, often running 100 to 150 feet from the back door to the rear property line. That depth is what makes a detached backyard ADU actually work in Downey, where on a narrower parcel it simply wouldn’t fit under setback rules. It also means a garage conversion here usually leaves room to keep a usable backyard.
Downey sits far enough inland that summers regularly push into the mid-90s, unlike the coastal cities ten miles west. That changes the conversation on every ADU we build here: a mini-split HVAC system is the standard ask, not a window unit, and roof insulation gets spec’d heavier than it would in a Long Beach bungalow. Original plumbing is typically galvanized or cast iron, and single-pane windows are the norm. When Downey’s own Building and Safety department reviews an ADU permit, most of these items get flagged for upgrade. The city runs its own department rather than routing through LA County, and local contractors will tell you the same thing we’ve seen: the 100-amp service on these aerospace-era homes gets called out as insufficient almost immediately once an ADU enters the picture. Budget for the 200-amp panel upgrade. It’s not optional in most cases.
Home is where most Downey homeowners start when they’re weighing an ADU against moving, and that math usually favors building on the lot they already own.
Our Main Downey Services
Downey homeowners call us most often about two things: converting an existing garage into living space, and building a detached ADU in the backyard. Here’s how each one plays out in this city.
Home Addition Contractor in Downey
A home addition in Downey means working with what the 1950s and 60s builders left behind: slab foundations, ranch footprints, and rooflines that were never designed for a second story. Most additions here go out, not up, which is where those deep Downey lots become an asset. The permit path runs through Downey’s own Building and Safety department, and expect the electrical service to come up in review. Whether it’s a bedroom suite, a larger kitchen, or a family room that finally fits everyone, we put the price in writing before any work begins. Home Addition Contractor in Downey
Garage Conversion Contractor in Downey
Downey’s attached two-car garages from the aerospace era convert well because they’re already built on a slab with a roof overhead. What they don’t have is insulation, a proper subfloor, or electrical capacity for anything beyond a door opener. A garage conversion in Downey typically means reframing the interior, running new circuits, insulating walls and ceiling for those mid-90s summers, and upgrading the panel alongside the rest of the work. The result is livable square footage without giving up backyard. Garage Conversion Contractor in Downey
ADU Builders in Downey
Detached ADUs are the Downey specialty, which makes sense once you see the lot depths here. A backyard unit on a 100-plus-foot lot can hold a one-bedroom layout with a real kitchen and still leave space for a patio between the two homes. Downey’s owner-occupancy rate is high and multigenerational households are common, so most of the ADUs we build in this city are for family, a parent moving closer or an adult child staying near. That informs everything from the floor plan to the soundproofing. ADU Builders in Downey
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 Downey
We work with a handful of established prefab ADU manufacturers, including our brands like Abodu, Cover, and Dvele. The right choice depends on your lot access, budget, and timeline, and we’ll talk through the trade-offs for your specific Downey property before you commit to anything.
Pricing for ADU Company in Downey, CA
| Service | Typical range in Downey |
|---|---|
| Detached ADU (1 bed, 1 bath) | $180,000 – $260,000 |
| Detached ADU (2 bed, 1 bath) | $220,000 – $320,000 |
| Garage conversion (attached, 1 bed) | $90,000 – $120,000 |
| Garage conversion (attached, 2 bed) | $110,000 – $150,000 |
| Full panel upgrade (100-amp to 200-amp) | $3,500 – $6,000 |
| Mini-split HVAC (per zone) | $3,000 – $5,500 |
| Roof insulation upgrade | $1,800 – $3,200 |
| Foundation repair or leveling (if needed) | $1,500 – $5,000 |
| Drain and sewer line replacement | $4,000 – $12,000 |
| Permit fees (Downey Building & Safety) | Varies by scope; budget $3,000 – $7,000 |
The two things that push price up in Downey more than anywhere else are the 200-amp panel upgrade, which is nearly universal, and the condition of original cast-iron or galvanized drain lines, which sometimes need full replacement before the city signs off. The Kingswell Guarantee means the price we give you in writing is the price you pay, before a single nail is driven.
Neighborhoods We Serve in Downey
We run crews across Downey, from the ranch neighborhoods around Wilderness Park up to the streets bordering the 105 on the north side. Most of our Downey work happens right in the residential middle of the city, where those deep aerospace-era lots live.
- Central Downey (near Apollo Park)
- Southeast Downey (Wilderness Park area)
- North Downey (along the 105 corridor)
- West Downey (west of Paramount Boulevard)
- Northeast Downey (near Rio San Gabriel Park)
Service Area – Cities Near Downey
Lodgewick coordinates scheduling from our Los Angeles office, with crews working locally in Downey and the surrounding communities. If you’re a homeowner in a neighboring city, we can help there too: Bell Gardens, CA, Santa Fe Springs, CA, Paramount, CA, and Bellflower, CA.
Serving Downey, CA - Our Local Coverage Area
We’re based in the Downey 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 Downey
Permitting in Downey typically takes 3 to 6 months from submittal to approval, which shapes every project timeline. We’ll give you a written schedule before work begins, including a real arrival window for our crews. Call (254) 602-5618 to talk through your lot and get a start date estimate.
Yes. Downey’s Building and Safety department requires permits for garage conversions and ADUs, and the review will almost certainly flag your original 100-amp electrical service for upgrade to 200 amps. We handle the full permit path, including drawings, submissions, and inspections.
Every Lodgewick project includes the 365-Day Done Right Promise in writing. If work fails within the guarantee period, we come back and make it right at no charge. That return visit is part of the written guarantee you’ll have before construction starts, not a verbal promise after the fact. Call (254) 602-5618 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 Downey Customers Say
"Garage conversion into a studio for our teenager. Honest about what was realistic and what wasn't, finished close to schedule, and cleaned up the site daily."
- Marcus Beaumont"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt"Junior ADU conversion inside the house. They protected the rest of our place with plastic and daily cleanup. Done nearly on schedule and on the number they quoted."
- Sabrina Veld