A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Aliso Viejo, CA
Adding an ADU in Aliso Viejo means working with a city that has very particular rules about lot coverage, setback distances, and architectural consistency. Most Aliso Viejo homes sit on compact lots within master-planned communities, so the typical ADU project here leans toward detached units under 800 square feet or garage conversions that preserve driveway space. We’re Benson ADU Builders, and we handle the full ADU company scope in Aliso Viejo: permits, foundation, prefab or site-built construction, utilities, and final inspection. Call us at (903) 568-7222 and we’ll put a written price in front of you before anything gets built.
Why Aliso Viejo Homes Are Different
Aliso Viejo is one of Orange County’s newer planned cities, and that changes the ADU conversation from the first site visit. Most homes were built after 1990, which means better utility panels and more consistent framing than older coastal stock, but also stricter HOA oversight. Many neighborhoods, including Glenwood, Westridge, and the area around Aliso Viejo Country Club, have CC&Rs that require architectural committee review before an ADU permit can even be submitted to the city. That’s not a dealbreaker; it just means the paperwork has to be sequenced correctly, and we handle that sequencing as part of every Aliso Viejo project.
The terrain matters too. Aliso Viejo’s hillside lots above Wood Canyon create grading and drainage challenges on detached ADU foundations, while flatter tracts like California Summit are simpler builds. The local soil is largely decomposed sandstone and clay, which drains slower than coastal sand, so foundation drainage details get more attention here than they would in Laguna Beach. We also see a lot of two-story homes with tandem garages, which makes a JADU (junior ADU, a small attached unit built inside an existing home’s footprint) a smart option for homeowners who don’t want to lose parking.
Our Main Aliso Viejo Services
Aliso Viejo homeowners call us most often for one of three projects: a new ADU, a full home addition, or a room addition. Each has its own dedicated Aliso Viejo page with pricing and specifics.
ADU Builders in Aliso Viejo
We build detached and attached ADUs across Aliso Viejo, from compact 450-square-foot studios to two-bedroom units that bring in rental income. Most Aliso Viejo lots can hold a detached unit if we work within the city’s setback requirements, which means the unit’s walls must sit a certain distance from the property line. We explain that plainly, bring in a prefab option from Dvele or a site-built plan, and put the full cost in writing before permits are pulled. See what an ADU costs and how the process works on ADU Builders in Aliso Viejo.
Home Addition Contractor in Aliso Viejo
A home addition in Aliso Viejo usually means expanding the main house: extending a kitchen, adding a family room, or building a second-story bump-out. HOA design review is the variable we watch most here, because an addition that changes the front elevation often needs extra architectural documentation. We handle that for you. Detailed pricing and a breakdown of how we manage Aliso Viejo additions are on Home Addition Contractor in Aliso Viejo.
Room Addition Contractor in Aliso Viejo
A room addition is a single-space project: one bedroom, one office, one bath. These jobs move faster than full additions because the structural load is smaller and the permit path is shorter. On Aliso Viejo hillside lots we spend extra time on shear wall details, which keep a single added room tied correctly into the home’s lateral strength. That’s not optional in this terrain. Pricing and what to expect are on Room Addition Contractor in Aliso Viejo.
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 Aliso Viejo
Benson ADU Builders is authorized to build with Cover, Dvele, and Boxabl in Aliso Viejo. We keep the most-specified panel models and finish samples available locally for Aliso Viejo appointments, which cuts design wait time. See the full lineup on our brands page.
Pricing for ADU Company in Aliso Viejo, CA
| Service | Typical range in Aliso Viejo |
|---|---|
| Detached ADU (studio, 400 – 500 sq ft) | $180,000 – $230,000 |
| Detached ADU (1BR, 600 – 750 sq ft) | $240,000 – $310,000 |
| Detached ADU (2BR, 800 – 1,000 sq ft) | $330,000 – $410,000 |
| Garage conversion ADU | $130,000 – $180,000 |
| Attached ADU (expansion of existing home) | $170,000 – $250,000 |
| JADU (junior ADU, inside existing footprint) | $90,000 – $140,000 |
| Prefab ADU (Dvele or Boxabl unit, installed) | $200,000 – $320,000 |
| Home addition (kitchen or family room extension) | $140,000 – $260,000 |
| Second-story addition | $300,000 – $450,000 |
| Room addition (single room, 150 – 300 sq ft) | $70,000 – $130,000 |
What pushes a number toward the top of the range in Aliso Viejo: hillside grading, retaining walls, HOA-required design revisions, and upgraded seismic details. The number we quote you is the number you pay; written price before work starts, no change orders showing up later.
Neighborhoods We Serve in Aliso Viejo
We work throughout Aliso Viejo, and most of our ADU and addition projects cluster in these areas:
- Glenwood
- Westridge
- California Summit
- Aliso Viejo Country Club area
- Wood Canyon
We typically schedule the first on-site walkthrough within a few business days of your call, depending on how many Aliso Viejo projects are in progress that week. Call (903) 568-7222 to get a date locked.
Service Area – Cities Near Aliso Viejo
Benson ADU Builders also covers the cities immediately around Aliso Viejo. If you’re in Laguna Hills, CA, Laguna Woods, CA, Laguna Niguel, CA, or Laguna Beach, CA, the same written-price process applies. Scheduling and dispatch are coordinated from our Los Angeles office, and crews serve Aliso Viejo locally.
Serving Aliso Viejo, CA - Our Local Coverage Area
We’re based in the Aliso Viejo 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 Aliso Viejo
After the first call, we schedule a site visit within a few business days, then begin design and HOA packet preparation. The full timeline depends on HOA review and city permit processing, but we start moving immediately. Call (903) 568-7222 to get your project on the schedule.
Yes, and more than in older Orange County cities. Many Aliso Viejo communities require architectural committee sign-off before the city will accept an ADU permit application. We prepare and submit that packet for you, so the HOA step doesn’t stall your project. Call us for a free estimate that includes this scope.
We cover the entire city, including Glenwood, Westridge, California Summit, and the neighborhoods near the country club and Wood Canyon. If you’re in Aliso Viejo, we’ll come out. Call (903) 568-7222 to confirm your address and schedule a walkthrough.
Ready to price an ADU or addition in Aliso Viejo? Call Benson ADU Builders at (903) 568-7222 for a free estimate and a written price before any work starts.
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 Aliso Viejo 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.
