A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Pasadena, CA
Most Pasadena ADU projects cost between $180,000 and $350,000 for a detached unit, with garage conversions running lower and custom site-built homes reaching higher. What changes the math here more than anything is the age and shape of Pasadena’s housing stock, a lot of it built between 1910 and 1950, with lot lines that got tighter as the city grew toward the Arroyo Seco. We’re Benson ADU Builders, and we approach every Pasadena project with a written price before any work starts. Call (903) 568-7222 to talk through your specific lot.
Why Pasadena Homes Are Different
Pasadena has some of the most varied residential architecture in Southern California, and that variety shows up the moment you walk a property. A Craftsman bungalow in Bungalow Heaven from 1912 sits on a different foundation, with different setbacks, than a mid-century ranch in Hastings Ranch or a hillside home in the San Rafael Hills. What stays consistent across nearly all of them is the role of terrain. Homes up against the foothills often have sloped lots, which changes how we set a prefab unit, run drainage, and handle the foundation work. Flatland neighborhoods in central Pasadena tend to be easier, but they also carry stricter design review in historic districts.
The climate matters too. Hot, dry summers and the occasional heavy winter rain mean we specify James Hardie cladding on many Pasadena ADU exteriors, because it holds up to both sun and moisture without warping. And the city’s permit process, while thorough, rewards applications that arrive complete with site plans and property-line surveys already attached. That’s how we submit every project in Pasadena, so you’re not waiting on a correction letter two months in.
Our Main Pasadena Services
Pasadena homeowners reach out to us most often for three things: a new detached or attached ADU, a larger home addition, or a single room added onto the existing structure. Each one has its own page below so you can go straight to the details that matter to your project.
ADU Builders in Pasadena
A detached ADU in Pasadena means a second home on your lot, typically 400 to 1,000 square feet, with its own kitchen, bath, and entrance. We build with prefab systems from Abodu and Dvele where they fit the lot, which cuts construction time meaningfully, or we go site-built when the design calls for it. Pasadena’s setback rules are strict, especially in the older single-family zones, so we start every ADU conversation by pulling your lot’s specific requirements. That’s the fastest way to know what will actually fit. See the full breakdown on our ADU Builders in Pasadena page.
Home Addition Contractor in Pasadena
A home addition in Pasadena usually means adding a family room, a primary suite, or extending the kitchen outward. On the older lots, that often means working around mature trees, which the city takes seriously when it comes to root-protection zones. We coordinate grading, foundation, framing, and finish work as one team, and every project gets a written price before we start. If you’re weighing an addition against a detached ADU, the difference usually comes down to how the two structures will be used. Details and pricing are on our Home Addition Contractor in Pasadena page.
Room Addition Contractor in Pasadena
A room addition is the smaller version of the same idea: one bedroom, one office, one sunroom added to the existing footprint. In Pasadena, these are common in neighborhoods like Normandie Heights and Daisy Villa, where homes run a little smaller and owners want to add square footage without rebuilding. We handle the structural tie-in, the roofline match, and the permitting as one package. You’ll get a fixed quote before any work starts, not an estimate that drifts. See specifics on our Room Addition Contractor in Pasadena 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 Pasadena
In Pasadena we work most often with James Hardie cladding, Abodu prefab ADUs, and Dvele panelized systems. The benefit is that these are brands you can research independently before you ever commit. Parts and panels are ordered directly through each manufacturer and delivered to your lot. Learn more on our brands page.
Pricing for ADU Company in Pasadena, CA
| Service | Typical range in Pasadena |
|---|---|
| Detached ADU (prefab, 400 – 600 sq ft) | $180,000 – $240,000 |
| Detached ADU (site-built, 600 – 800 sq ft) | $260,000 – $350,000 |
| Garage conversion ADU | $120,000 – $180,000 |
| Attached ADU / JADU | $140,000 – $220,000 |
| Home addition (400 – 600 sq ft) | $160,000 – $280,000 |
| Home addition (600 – 900 sq ft) | $280,000 – $420,000 |
| Primary suite addition | $140,000 – $240,000 |
| Room addition (single room, 200 – 400 sq ft) | $80,000 – $160,000 |
| Kitchen extension | $90,000 – $180,000 |
| Second-story addition (per sq ft) | $350 – $550 per sq ft |
What pushes Pasadena pricing up is usually slope work, historic-district design review, and upgraded foundation requirements on older lots. What we won’t do is hand you one number and then change it once the job is underway. Every Pasadena project we quote gets a written price before work starts, and that price is the price.
Neighborhoods We Serve in Pasadena
We work across the full city, from the flat central neighborhoods up into the foothills. Response times run consistently within one to three business days for estimates anywhere inside Pasadena’s limits.
- Bungalow Heaven
- Madison Heights
- Hastings Ranch
- Oak Knoll
- Linda Vista
Service Area – Cities Near Pasadena
Most of our Pasadena crews also schedule work in the cities that share the same housing patterns and permit realities. That includes San Marino, CA, where estate lots run larger and additions tend toward full wings, plus South Pasadena, CA and Altadena, CA for their mix of older bungalows and hillside lots. We also cover San Gabriel, CA for homeowners considering an ADU attached to a mid-century ranch.
Serving Pasadena, CA - Our Local Coverage Area
We’re based in the Pasadena 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 Pasadena
Typically within one to three business days, depending on the week’s schedule. We’ll give you a confirmed arrival window when you book, and a live person answers the phone when you call (903) 568-7222.
No. We prepare and submit the permit package for your Pasadena project, including site plans and any required design-review documents. You’ll get updates as it moves through the city’s process.
Possibly, if your home sits in an HOA with architectural-review rules. We’ll help you understand what applies before any work is scheduled, and we set expectations up front so there are no surprises mid-project.
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 Pasadena 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.
