A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Acton, CA
Adding living space in Acton, CA means working with wide lots, single-story ranch homes, and a county permitting process that treats accessory dwelling units as a serious construction project, not a weekend job. We price ADUs, garage conversions, and room additions in writing before any work begins, and every job carries the Garrison Standard: a full year of written guarantee on workmanship. Reed Calloway runs our Acton work, and you can reach us directly at (361) 315-4177 for a free estimate.
Why Acton Homes Are Different
Acton sits in the high desert foothills of the Antelope Valley, where temperatures swing from freezing winter nights to triple-digit summer days. That range changes how we detail an ADU: insulation ratings, roof venting, and siding choices all get specified for that climate, not the coastal one 40 miles south. Most housing stock here was built between the 1960s and the 1990s, which means one-story layouts, composition shingle roofs, and slab foundations in many cases. When we add a room or convert a garage, the existing slab often needs leveling work before framing starts.
Lot sizes in Acton run large by LA County standards. That is an advantage for a backyard ADU because setback requirements are easier to meet when you have room. But it also means septic considerations on many properties. Homes outside the central water district often run on individual septic systems, and an ADU can push a system past its designed capacity. We flag that early in the estimate process so there are no surprises when the county reviews the plans. The terrain also matters. Acton grades from flat valley floor to hillside parcels, and a sloped lot changes foundation cost, drainage design, and access for equipment. None of this is exotic to us; it is just how Acton jobs go.
Our Main Acton Services
Acton homeowners call us most often about two projects: adding square footage to an existing home and converting an attached garage into a rentable or family-use dwelling. Here is what each looks like on the ground here.
Room Addition Contractor in Acton
A room addition in Acton usually means a ground-floor extension off the back or side of a ranch home. We handle the structural tie-in, roof matching, electrical, and the county inspections. One thing we watch for on older Acton homes is the roof condition; adding a new wing is the wrong time to leave a 25-year-old composition roof untouched above it. We will tell you if a re-roof should happen first, and we will put that in the written estimate rather than discover it mid-job. See what a fixed-price addition looks like on our Room Addition Contractor in Acton page.
Garage Conversion Contractor in Acton
Garage conversions are the fastest path to a rentable unit in Acton because the shell, slab, and roofline already exist. The work is in upgrading that shell to living space: insulation, drywall, electrical panel capacity, floor leveling, and window and door openings to meet egress rules. Acton garages built before the 1980s often lack the footing depth current code wants for a dwelling, and the county will ask about it. We design around what is there and price the fix upfront. Details are on our Garage Conversion Contractor in Acton page.
ADU Builders in Acton
A ground-up backyard ADU in Acton gives you the most control over layout and finish, but it means a full foundation, utility trenching, and a longer permit cycle than a conversion. We build conventional wood-frame ADUs and we also have working fluency with prefab platforms that ship partially assembled, which can shorten on-site time significantly on rural lots where weather and access are real factors. The right method depends on your lot, your budget, and what the county will approve. Our ADU Builders in Acton page breaks down build methods and what each one costs in this market.
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 Acton
We install and finish James Hardie fiber-cement siding on most conventional Acton builds because it holds up to the dry heat and wind we get here. For prefab ADUs, we work with Abodu, Cover, and Dvele panels and modules. Parts for these systems are ordered to the jobsite, which keeps turnaround predictable rather than tied to a local supply yard. See the full list on our brands page.
Pricing for ADU Company in Acton, CA
| Service | Typical range in Acton |
|---|---|
| Attached ADU (converted existing space) | $120,000 – $220,000 |
| Detached ADU (new backyard unit, up to 600 sq ft) | $150,000 – $280,000 |
| Detached ADU (600 – 1,200 sq ft) | $220,000 – $400,000 |
| Garage conversion (attached, up to 400 sq ft, to code) | $80,000 – $150,000 |
| Garage conversion (detached, up to 600 sq ft, with utilities) | $110,000 – $200,000 |
| Room addition (up to 300 sq ft, simple build) | $60,000 – $120,000 |
| Room addition (300 – 600 sq ft, with bath or kitchen rough-in) | $110,000 – $200,000 |
| Primary suite addition (attached, up to 500 sq ft) | $130,000 – $230,000 |
| Second-story addition (up to 500 sq ft, over existing structure) | $180,000 – $320,000 |
| Foundation work (if existing slab needs leveling or replacement) | $8,000 – $30,000 |
Septic system upgrades are the biggest price mover in Acton when they are required, and sloped lots add foundation and drainage cost that flat valley parcels do not carry. Whatever the number is, it goes in writing before we start, and that written number is what you pay at the end.
Neighborhoods We Serve in Acton
We take jobs across the Acton area, from the flatter lots near the 14 Freeway corridor up into the hillside parcels where roads narrow and access for equipment takes real planning. Most of our crew travel time in Acton runs 20 to 35 minutes depending on where your lot sits.
- Central Acton and Crown Valley Road corridor
- Acton north of Soledad Canyon Road
- Aliso Canyon and Arrastre Canyon areas
- South Acton near the 14 Freeway
- Acton foothill parcels off Escondido Canyon Road
Service Area – Cities Near Acton
While this page covers Acton specifically, we also serve surrounding communities where lot sizes and permit rules differ enough to matter. Look here for pricing and local details in Palmdale, CA, Lancaster, CA, Canyon Country, CA, and Santa Clarita, CA.
Serving Acton, CA - Our Local Coverage Area
We’re based in the Acton 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 Acton
Our crews are scheduled from the Los Angeles office and dispatched to Acton regularly. Depending on where your lot sits, plan on 20 to 35 minutes of travel time once the crew leaves the metro office. For scheduling questions, call (361) 315-4177 and a live person will answer.
Yes. Acton is unincorporated Los Angeles County, so ADUs, garage conversions, and room additions all go through county planning and building. We handle the drawings, submittal, and inspections on every job, and the permit cost is included in your written estimate before work starts.
It does. The Garrison Standard applies to every project we build in Acton: workmanship defects are covered in writing for 365 days, and if something fails inside that year, we return at no charge to correct it. Call (361) 315-4177 for a free estimate and a written price before any work begins.
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 Acton Customers Say
"Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G."Insulation, drywall, and finishes were all well done. Feels like part of the house."
- Pete O."Built a detached ADU behind our house. The builder is a veteran and runs the site like a platoon: schedule posted, crew on time, everything labeled. Finished within a few days of the date."
- Ken W.
