A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Arcadia, CA
An ADU in Arcadia typically costs between $180,000 and $420,000 for a site-built unit, with prefab options from brands like Cover and Dvele starting around $150,000 and often finishing far faster because much of the structure is assembled off-site. What makes Arcadia jobs different is the mix of older ranch homes on generous lots and newer two-story builds on tighter parcels, plus a city permitting process that expects clean, complete plans the first time. We’re home to a team that puts the price in writing before anything gets built. Call (903) 568-7222 to talk through your lot and your goals.
Why Arcadia Homes Are Different
Arcadia’s housing stock runs from 1940s and 1950s ranch homes south of Huntington Drive to larger, newer builds up toward the foothills, and that spread changes how every ADU or addition gets designed. The older homes often have shallow foundations, outdated electrical panels, and sewer lines that need a camera inspection before we position a new unit, while the newer properties tend to run into tighter setback requirements and HOA design-review rules. A setback is the minimum distance a structure must sit from the property line and in Arcadia those numbers can shift by zone, so a plan that fits one block may not fit three streets over.
Climate matters too. Arcadia summers hit triple digits, which pushes us toward insulation packages and glazing choices that keep a backyard unit livable without running the AC nonstop. Soil in parts of Arcadia is expansive, meaning it swells and shrinks with moisture, and that affects how we detail the foundation. We also coordinate with local utility rules for trenching and connections, because the last thing any homeowner wants is a surprise fee for a power upgrade that a generic plan never caught.
Our Main Arcadia Services
Most Arcadia homeowners call us about one of three things: building a new ADU, expanding the main house, or adding a single room. Each has its own Arcadia page with full pricing and process details.
ADU Builders in Arcadia
An ADU is a fully independent dwelling unit, meaning it has its own kitchen, bathroom, entrance, and address. In Arcadia, detached ADUs work well on the wider lots south of the 210, while attached conversions and garage conversions suit homes where the rear yard is smaller. We walk the property, check the zoning envelope, and give you a written price for both site-built and prefab paths, including brand options like Cover and Dvele. Troy Eastman reviews every plan before it reaches your hands. For the full breakdown, see ADU Builders in Arcadia.
Home Addition Contractor in Arcadia
A home addition expands the footprint of the main house itself, not a separate structure. In Arcadia, that often means a new primary suite, a family room bump-out, or a second-story addition over an existing first floor. The biggest local variables are foundation work and roof tying, because matching an older Arcadia roof line and making the new section feel original takes real carpentry. We give you a fixed written price before any demo begins and keep the schedule visible throughout. Details are on Home Addition Contractor in Arcadia.
Room Addition Contractor in Arcadia
A room addition is a single-space project, like adding a bedroom, an office, or a playroom without a full reconfiguration of the house. In Arcadia, homeowners often add a ground-floor bedroom for aging parents, which brings up doorway widths, bathroom proximity, and a level entry. Our scope includes the foundation, framing, roofing tie-in, electrical, drywall, and finish work, all priced in writing upfront. Every crew member on site is background-checked and in uniform. Read more on our Room Addition Contractor in Arcadia page.
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 Arcadia
We build with and service units from Cover, Dvele, and Mighty Buildings, and we have direct access to their components and replacement parts when a warranty item or repair comes up in Arcadia. That typically means a faster turnaround than a shop that has to order unfamiliar parts sight unseen. See our brands for the full list and what each one suits.
Pricing for ADU Company in Arcadia, CA
| Service | Typical range in Arcadia |
|---|---|
| ADU building (site-built) | $180,000 – $420,000 |
| ADU building (prefab) | $150,000 – $400,000 |
| Garage conversion ADU | $100,000 – $195,000 |
| Attached ADU | $120,000 – $250,000 |
| Detached ADU | $150,000 – $420,000 |
| Home addition (per square foot) | $250 – $450 |
| Home addition (full project) | $80,000 – $300,000+ |
| Room addition | $35,000 – $130,000 |
| Second-story addition | $200,000 – $500,000+ |
| Prefab panel ADU | $150,000 – $300,000 |
What pushes an Arcadia project toward the top of those ranges is usually site work: foundation repair on older slabs, sewer or power upgrades, and longer trenching runs from the street. The price we give you is the price you pay, in writing before work starts, and every project carries a 365-Day Done Right Promise.
Neighborhoods We Serve in Arcadia
We schedule ADU and addition work across Arcadia, from the streets around Baldwin Avenue and Live Oak to the neighborhoods north of Foothill Boulevard. Our teams know the permit desk, the soil patterns, and the typical HOA review triggers in this area, which keeps plans moving.
- The Highlands
- Baldwin Stocker
- South Arcadia
- North Arcadia
- Hugo Reid
Service Area – Cities Near Arcadia
Beyond Arcadia, our crews serve homeowners in Monrovia, CA, Temple City, CA, Sierra Madre, CA, and San Gabriel, CA. If you are a few blocks over the city line, the same written-price process and 365-Day Done Right Promise apply to your project.
Serving Arcadia, CA - Our Local Coverage Area
We’re based in the Arcadia 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 Arcadia
After we sign the agreement and the plans are submitted, the timeline depends on city plan-check and your project’s scope. We give you a written schedule with milestones before work begins, and a live person answers the phone around the clock if you want a status update. Call (903) 568-7222 for a free estimate and a realistic timeline for your lot.
If your home sits in an HOA, yes, you typically need design-review approval before the city signs off, even though state law limits how much an HOA can restrict an ADU. We handle the paperwork and drawings the HOA board wants to see. Call (903) 568-7222 and we will check your specific subdivision.
We pull all required permits and schedule the inspections as part of the project. Our written price includes the permit fees and the work stays in our hands through final sign-off, so you are never left chasing a city inspector on your own.
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 Arcadia Customers Say
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N.
