A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Camarillo, CA
ADU construction in Camarillo runs roughly $180,000 to $350,000 for a turnkey prefab unit and $400,000 to $550,000 for a site-built two-bedroom with a kitchen. The city’s mix of 1960s and 1970s ranch homes on oversized lots makes it one of the more ADU-friendly markets in Ventura County, but the older foundations and hillside drainage in neighborhoods like Camarillo Heights mean the ground work often costs more than the structure itself. We’re Benson ADU Ventura, and we put all of it in writing before you commit to anything. Call us at (350) 207-2506 and we’ll walk you through what’s realistic for your specific lot.
Why Camarillo Homes Are Different
Most Camarillo homes were built between 1960 and 1985, when slab-on-grade foundations and ranch-style footprints were the norm. That’s good and bad for ADUs. The good: those big backyards give you room to work with, and the single-story rooflines make it easier to tie a detached unit into the existing sightline. The bad: many original slabs were never engineered to carry the point loads of a new structure, so we regularly plan for foundation reinforcement before the first panel ships. Utility connections are the other wild card. Homes in the older tracts around Las Posas Road and north of the 101 sometimes still run on original 100-amp panels, which won’t support a second dwelling without a service upgrade.
Camarillo’s Mediterranean climate works in your favor. Mild winters and dry summers mean we don’t need the heavy moisture barriers or extreme insulation packages required in coastal fog zones. But the hillside streets in Camarillo Heights are a different animal. Those lots follow the contour lines, which means custom foundation work and drainage plans on almost every project. Winter rain runs downhill fast, and a poorly graded ADU site will push water toward the main house. We plan grading, swales, and French drains into the written price from day one, not as a change order later.
Camarillo also has design review standards that are stricter than unincorporated parts of the county. The city wants ADUs to look like they belong on the lot, not like a shipping container dropped behind a ranch house. That’s honestly where our prefab partnerships make the biggest difference. Brands like Cover and Dvele design units that already meet a lot of the aesthetic bar Camarillo expects, which saves you design-committee headaches and keeps the schedule moving.
Our Main Camarillo Services
Most Camarillo homeowners start with one of three questions: Can I fit an ADU on my lot, can I add onto the house instead, and which one costs less per square foot. The three services below are the calls we field most often, and each has its own page with full pricing.
ADU Builders in Camarillo
Detached ADUs are the most popular option in Camarillo because the older ranch lots usually have the side-yard or rear-yard space to support one. The most common setups we quote are 400 to 750 square foot one-bedroom units with a kitchenette, but two-bedroom units work well for families using the space for grandparents or adult children. The key local condition is setback compliance and the city’s design review expectations. We handle the planning, foundation work, utility tie-ins, and the full build. ADU Builders in Camarillo has the full pricing breakdown and what to expect on your specific lot.
Home Addition Contractor in Camarillo
When the ADU route doesn’t pencil out financially or the lot is too tight for a detached structure, a home addition often makes more sense. In Camarillo, that usually means extending the rear of a ranch home to add a primary suite, a family room, or a full second living area. Existing foundations on 1960s and 1970s slabs frequently need reinforcement, and roof tie-ins on older truss systems require careful engineering. Home Addition Contractor in Camarillo covers what a rear or side addition costs in this market and how we keep the job on one written price.
Room Addition Contractor in Camarillo
A room addition is the smaller, faster cousin of a full home addition. Think home office, fourth bedroom, gym, or a dedicated playroom off the back of the house. Camarillo homeowners gravitate toward these when they need one more room but don’t want the full kitchen and plumbing scope of a true ADU. Hillside lots in Camarillo Heights add grading and drainage work to the base price, and we include that in the written number before you sign. Room Addition Contractor in Camarillo lays out the pricing tiers and what affects the final figure.
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 Camarillo
We build with prefab and panelized systems from Cover, Dvele, Mighty Buildings, and Boxabl, plus James Hardie cladding for site-built and hybrid projects. Parts and panels are staged locally for Camarillo jobs, which keeps typical lead times predictable. Our brands page breaks down each option with specs and finish levels.
Pricing for ADU Company in Camarillo, CA
These are the ranges we quote most often for Camarillo work. Every line is a ballpark based on real projects in this market, but your lot, foundation, and finish choices move the needle in either direction.
| Service | Typical range in Camarillo |
|---|---|
| Prefab ADU (studio, 300 – 400 sq ft) | $180,000 – $250,000 |
| Prefab ADU (1 bedroom, 400 – 600 sq ft) | $220,000 – $300,000 |
| Prefab ADU (2 bedroom, 700 – 1,000 sq ft) | $280,000 – $380,000 |
| Site-built ADU (1 bedroom, 400 – 600 sq ft) | $280,000 – $380,000 |
| Site-built ADU (2 bedroom, 700 – 1,200 sq ft) | $400,000 – $550,000 |
| Garage conversion ADU | $150,000 – $250,000 |
| JADU (attached junior ADU, up to 500 sq ft) | $120,000 – $200,000 |
| Home addition (primary suite, 300 – 500 sq ft) | $150,000 – $280,000 |
| Home addition (kitchen extension, 200 – 400 sq ft) | $120,000 – $220,000 |
| Room addition (bedroom, 150 – 250 sq ft) | $60,000 – $110,000 |
| Room addition (home office, 120 – 200 sq ft) | $50,000 – $90,000 |
| Foundation reinforcement (older Camarillo slabs) | $12,000 – $35,000 |
What pushes Camarillo prices up is almost always the foundation and the utility panel. A 1972 ranch slab that needs reinforcement adds real cost before any walls go up, and an original 100-amp panel won’t pass inspection for a second dwelling. Both get caught in our written estimate up front, so the number you sign is the number you pay. That’s the whole point of how we work.
Neighborhoods We Serve in Camarillo
We work across the entire Camarillo area, from the older tracts near the historic downtown to the newer builds up in Spanish Hills. The most common neighborhoods we quote ADUs and additions in include:
- Camarillo Heights
- Spanish Hills
- Mission Oaks
- Las Posas Estates
- Central Camarillo
Typical scheduling for estimates in the Camarillo area runs within a few business days, and we coordinate site visits around your availability.
Service Area – Cities Near Camarillo
We serve the Camarillo area and nearby Ventura County communities. If you’re just over the grade or down the road, we work in Somis, CA, Oxnard, CA, Newbury Park, CA, and Santa Paula, CA. Scheduling is coordinated through the brand’s Los Angeles office, with crews dispatched locally to Camarillo.
Serving Camarillo, CA - Our Local Coverage Area
We’re based in the Camarillo 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 Camarillo
A typical prefab ADU in Camarillo runs five to eight months from deposit to occupancy, depending on design review and foundation conditions. Site-built units take longer, usually eight to twelve months. Your written estimate includes a milestone schedule so you can track it in real time.
California law limits HOA restrictions on ADUs, but some Camarillo HOAs still require design review for exterior finishes and colors. We prepare the submittal package for you, but the review can add a few weeks to the schedule. Call (350) 207-2506 and we’ll check your specific HOA before you commit.
No. Every Benson ADU Ventura project in Camarillo starts with a written price that includes foundation work, utility upgrades, and the specified finishes. The only way a number moves is if you change the scope, and that gets its own written change order before any work proceeds. Call us at (350) 207-2506 to schedule a free, no-pressure 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 Camarillo Customers Say
"Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Great build. Inspection delay, the county's fault, pushed things a week, but updates were clear."
- Soo-jin P."Garage conversion into a guest suite. I could see the permit status in the app, which made it painless."
- Rick F.
