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
An ADU in Pasadena typically costs $180,000 – $320,000 for a detached unit before site work, and the city’s distinct mix of hillside lots, century-old bungalows, and strict design review means pricing and timelines here don’t look like they do in other LA County cities. Crews who don’t know Pasadena’s setback rules and tree ordinances lose weeks to corrections. We do the paperwork legwork first so your construction timeline doesn’t stall at the counter. Call (472) 248-8213 to talk through your lot.
Why Pasadena Homes Are Different
Pasadena’s housing stock runs older than most of the San Gabriel Valley. Large portions of the city were built out between 1900 and 1940, which means detached garages are often single-car, non-conforming structures that sit a foot from the property line. Converting one into an ADU isn’t a simple swap of a door and some drywall. The slab is usually too thin, the electrical service is sixty years old, and the existing roofline rarely meets current height or insulation codes. We plan for those discoveries up front and price them into the written quote instead of springing them on you at week six.
Terrain is the other Pasadena wildcard. The San Rafael Hills and the neighborhoods rising toward Altadena introduce slope work, retaining walls, and drainage requirements that flatland builders never see. A detached ADU on a steep lot in the San Rafael area may need pier-and-grade-beam foundation work before a single wall goes up. In the flats around Bungalow Heaven or the Caltech-adjacent neighborhoods, the challenge flips: older gas and sewer lines buried shallow, mature trees with protected root zones, and neighbors close enough that delivery and access need a plan. Both scenarios are very doable, but they demand local experience, not a generic ADU template. Sierra Madre Villa and Foothill Boulevard corridors add commercial adjacency and noise considerations to the design conversation.
Our Main Pasadena Services
Three services cover most of the calls we take in Pasadena: full-size home additions, detached or garage-conversion ADUs, and smaller room additions. Each has its own dedicated page with local pricing and process details.
Home Addition Contractor in Pasadena
A home addition in Pasadena often means extending a 1920s bungalow sideways or adding a second story above a structure that was never engineered for it. Foundation type, roof tie-in, and seismic retrofit requirements vary by neighborhood and by what the original builder left under the stucco. We always recommend a full structural review before committing to a design, and our written price covers the site conditions we document in that review. Home Addition Contractor in Pasadena
ADU Builders in Pasadena
Pasadena is one of the more ADU-forward cities in the LA area, but lot size, setbacks, and owner-occupancy rules still create real constraints depending on your parcel. Detached units, garage conversions, and prefab options each carry different feasibility and price profiles here. We have experience with Abodu, Cover, Dvele, and Mighty Buildings panels, and we’ll tell you honestly when a site-built ADU makes more sense than a factory-built one. ADU Builders in Pasadena
Room Addition Contractor in Pasadena
A single room addition is often the fastest way to add livable square footage without triggering major site work. In Pasadena, though, even a 200-square-foot bump-out can mean foundation ties, window-schedule changes, and updated egress to meet current code. Older homes in neighborhoods like Madison Heights and Orange Heights were built before modern insulation and electrical standards, so we quote the full package, not just the new walls. Room Addition Contractor in Pasadena
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
We install and service ADUs from Abodu, Cover, Dvele, and James Hardie exterior systems. Panels and finish materials are ordered regionally, so Pasadena projects stay on schedule without waiting weeks on specialty parts. See our brands for the full range.
Pricing for ADU Company in Pasadena, CA
Pasadena ADU and addition pricing lands higher than county averages because of design review, seismic upgrades on older homes, and the frequency of hillside site work. The table below reflects our most common project scopes in this city.
| Service | Typical range in Pasadena |
|---|---|
| Detached ADU (under 600 sq ft) | $180,000 – $260,000 |
| Detached ADU (600 – 1,000 sq ft) | $260,000 – $320,000 |
| Detached ADU (site work, slope/pier foundations) | Add $25,000 – $55,000 |
| Garage conversion ADU | $130,000 – $210,000 |
| Prefab ADU (Abodu, Cover, or Dvele) | Varies by model and site prep |
| Home addition (300 – 600 sq ft) | $150,000 – $260,000 |
| Home addition (600 – 1,200 sq ft) | $240,000 – $420,000 |
| Room addition (150 – 300 sq ft) | $80,000 – $150,000 |
| Foundation repair or slab pour | $8,000 – $25,000 |
| Permit and design package | $8,000 – $20,000 |
| Site preparation and grading | $6,000 – $18,000 |
| James Hardie siding installation | $18,000 – $40,000 |
What pushes a Pasadena price upward: hillside foundation work, upgrade of an existing panel or gas line, protected tree mitigation, and design review revisions. What doesn’t push price up is working with us: a written price before any work starts means the number you approve is the number you pay, no silent change orders.
Neighborhoods We Serve in Pasadena
We work across Pasadena, from the hillside streets of the San Rafael district to the historic lots in Bungalow Heaven and the craftsman-heavy blocks around Madison Heights. Crews are dispatched locally, and a typical first visit happens within a few business days of your call.
- Bungalow Heaven
- Madison Heights
- San Rafael Hills
- Orange Heights
- Caltech-adjacent neighborhoods
Service Area – Cities Near Pasadena
Beyond Pasadena, we serve the neighboring cities and communities where our crews already have deep permitting and terrain familiarity. If your property sits close to these areas, we can usually help:
San Marino, CA · South Pasadena, CA · Altadena, CA · San Gabriel, CA
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
Most Pasadena ADUs run 6 – 12 months from design to final inspection, with the city’s plan-check phase often taking the single largest block of time. We submit drawings early and track revisions weekly. Call (472) 248-8213 for a realistic timeline on your specific project.
Pasadena requires a building permit, zoning review, and often a design review depending on the historic district or hillside overlay that may apply to your property. We handle the full permit package, including any corrections. The written quote covers this work before it starts.
No, not unless you change the scope. The 365-Day Done Right Promise covers workmanship for a full year, and our written price from the start is the price that holds. Call (472) 248-8213 to schedule your free 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 Pasadena Customers Say
"Every crew member was vetted and carried a badge, which matters when they are around your family for months. Tidy site every day."
- Daniel F."Itemized estimate with allowances laid out. Final cost was within a hair of the quote."
- Naomi R."Backyard ADU for my mother. The project manager showed ID and walked me through the permit steps, the foundation plan, and the schedule. Moved her in on time."
- Margaret C.
