ADU Company in Orange, CA
ADU work in Orange, CA isn’t the same as building an accessory dwelling unit in Irvine or Anaheim. A large share of the city’s homes predate World War II, especially around Old Towne, and that changes everything: electrical panels from the 1950s, cast-iron drain lines, narrow side yards, and a Design Review Committee that actually reads your material specs. If you’re weighing a garage conversion, a detached ADU, or a home addition on an Orange lot, call us at (254) 602-5618. We’ll tell you what your specific property can handle, what it’ll cost, and put it in writing before any work begins.
Why Orange Homes Are Different
Orange is two housing stocks in one city. West of the 55 Freeway, the Old Towne district holds one of Southern California’s densest collections of 1910s through 1940s Craftsman bungalows and Spanish Colonial Revival homes, most sitting on narrow 50-by-150-foot lots. These jobs routinely surface knob-and-tube wiring, undersized 60-amp panels, and cast-iron or galvanized drain lines that have to be addressed before an ADU can pass inspection. East of the 55, postwar ranch tracts from the 1950s and 60s are the more common setting for attached garage conversions, and those nearly always need seismic anchor-bolt retrofits plus a subpanel upgrade to handle the new load.
The climate adds another layer. Orange sits far enough inland that Santa Ana wind events in fall and winter put real stress on roof-to-wall connections and attic ventilation on any new detached structure. And those hotter inland summers? They push most of our Orange ADU builds toward ductless mini-split systems rather than window units, simply to hit Title 24 energy compliance without oversizing the panel.
Our Main Orange Services
Most Orange homeowners who call us are weighing one of three paths: an attached addition, a garage conversion, or a fully detached ADU. Each has its own page here because each one plays by different rules in this city.
Home Addition Contractor in Orange
A room addition in Orange usually means tying a new foundation and roofline into a structure that’s 60 to 100 years old, which is a different craft than building new. We survey the existing framing, check the panel, and design the addition so the transition doesn’t leak or settle. In Old Towne, the Design Review Committee will want to see materials and window profiles that match the original house. Russ Delmar and the crew manage that paperwork before you ever see a hammer. Home Addition Contractor in Orange
Garage Conversion Contractor in Orange
Converting an attached garage is the fastest path to livable square footage in Orange’s east-side ranch tracts, but it isn’t a drywall-and-paint job. Most of these garages were never expected to be living space: the slab may be uninsulated, the walls lack shear strength, and the electrical panel usually can’t carry a bedroom, bath, and mini-split. We quote the full scope up front, including the seismic and panel work, so the number on your written estimate is the number. Garage Conversion Contractor in Orange
ADU Builders in Orange
A detached ADU in Orange has to clear three hurdles: a 50-by-150 lot with shallow side-yard setbacks, a historic district that may demand Craftsman or Spanish Revival character, and Santa Ana wind conditions that reward careful roof-to-wall detail. We match the right system, often a prefab unit from Cover, Dvele, or Boxabl, to your lot and your budget, and we handle the pre-application meeting with the Design Review Committee before pulling permits. ADU Builders in Orange
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 Orange
We work hands-on with several prefab ADU manufacturers, including Cover, Dvele, Mighty Buildings, and Boxabl. We know which units clear Orange’s design review with the least friction and which panels and finishes hold up under inland heat and Santa Ana winds. See our brands for the full run-down.
Pricing for ADU Company in Orange, CA
Every Orange job gets a written line-item quote before work starts. Here’s what we typically see across the city.
| Service | Typical range in Orange |
|---|---|
| Home addition, all-in | $380 – $520 per sq ft |
| Addition, foundation | $18 – $32 per sq ft |
| Addition, framing | $22 – $42 per sq ft |
| Addition, electrical panel upgrade | $2,800 – $5,500 |
| Addition, full bathroom | $22,000 – $48,000 |
| Garage conversion, all-in | $135,000 – $220,000 |
| Garage conversion, foundation work | $7,000 – $18,000 |
| Garage conversion, kitchenette | $8,000 – $24,000 |
| Detached ADU, all-in | $240,000 – $420,000 |
| Detached ADU, site prep and foundation | $28,000 – $55,000 |
Old Towne projects tend to land at the higher end of those ranges because of material requirements set by the Design Review Committee, and pre-war homes east or west of the 55 often carry surprise electrical and plumbing costs once walls open up. That’s why our written price comes after an on-site walkthrough, not before, and why it doesn’t change at the door.
Neighborhoods We Serve in Orange
We work across Orange, from the historic blocks of Old Towne to the ranch tracts east of the 55. Our schedule keeps crews within the city most days, which means site visits and estimates usually fit into a normal work week without a long wait.
- Old Towne Orange
- Orange Park Acres
- El Modena
- Eichler-inspired tracts east of the 55
- Orange Hills
Service Area – Cities Near Orange
While this page covers Orange itself, our crews also take on jobs in Santa Ana, CA, Tustin, CA, Garden Grove, CA, and Placentia, CA. Each city has its own permitting quirks, so call (254) 602-5618 and we’ll point you to the right page or set up a walkthrough.
Serving Orange, CA - Our Local Coverage Area
We’re based in the Orange 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 Orange
We schedule on-site walkthroughs across Orange on a rolling basis, usually within a normal work week depending on how full our crew calendar is. Call (254) 602-5618 and a live person will get you on the schedule, not a voicemail tree.
Yes. For projects inside the Historic Preservation Overlay Zone, we front-load a pre-application meeting with the Design Review Committee and spec period-appropriate materials before pulling a single permit. That’s the only way to avoid a rejected application over lap siding or window profiles.
It won’t. We give every Orange homeowner a written price before work begins, and that’s the price. If something hidden shows up after we open a wall, we name it, show it to you, and put any change in writing before a single dollar is added. Estimates are free at (254) 602-5618.
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 Orange Customers Say
"Built a backyard unit for my mother in law. They handled the permits, gave me a real timeline, and stuck to it within a few days. The written price is what we paid, which anyone who's done construction knows is rare."
- Dennis Fairchild"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