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
Pasadena is one of the most ADU-friendly cities in Los Angeles County, but the work here comes with real constraints: older foundations, hillside setbacks, historic-district review, and a permit office that asks for more detail than most. We build accessory dwelling units, garage conversions, and room additions in Pasadena with a written price before any work starts, and every job is backed by our one-year Done Right Promise in writing. If you’re weighing whether your Pasadena lot can support an ADU, call (361) 315-4177 and we’ll walk you through what’s realistic.
Why Pasadena Homes Are Different
Pasadena’s housing stock spans Craftsman bungalows from the 1910s, Spanish revivals from the 1920s and 1930s, mid-century ranches, and a growing number of teardown-and-rebuild lots. That range means the foundation under your ADU might be poured concrete, raised wood, or post-and-pier, and each one changes how we detail the connection between old and new. Many homes in Bungalow Heaven, Madison Heights, and the streets north of the 210 predate modern seismic codes, so a permitted ADU almost always triggers shear-wall and strapping upgrades where the new structure meets the existing one.
The terrain adds another layer. Pasadena slopes up toward the San Gabriel Mountains, and lots in the Linda Vista and Annandale areas often carry hillside overlay requirements that affect grading, drainage, and foundation design. A flat lot in southeast Pasadena is a different job than a stepped lot off Linda Vista Avenue. We also work around the city’s tree-protection ordinances: mature oaks and protected specimens can limit where an ADU sits, and the city expects the plans to show those trees and their root zones. Pasadena’s permit review is thorough, and projects move faster when the drawings anticipate what the plan checker will ask.
Our Main Pasadena Services
Most Pasadena homeowners come to us for one of three things: adding square footage to the main house, converting an existing garage, or building a detached ADU in the rear yard. Each has its own page with local pricing, process details, and what to expect during review.
Room Addition Contractor in Pasadena
Room additions in Pasadena typically tie into the main house and run through the same plan-check process as new construction, including energy calculations and foundation work. We handle the structural drawings, pull the permits, match rooflines and siding, and finish the interior to the existing floor level of your home. On older Pasadena homes, we frequently find foundation offsets that need shimming or underpinning before framing starts, and we price that into the written quote rather than surprising you later. See the full scope on the Room Addition Contractor in Pasadena page.
Garage Conversion Contractor in Pasadena
A garage conversion in Pasadena is usually the fastest path to an extra bedroom or rental unit, but the existing slab and wall framing have to meet current code for a conditioned living space. We level or replace slabs where needed, reframe openings, add insulation, run new electrical, and bring the structure up to the city’s ADU conversion standards. Detached garages on Pasadena alleys often have older footings that fail inspection, so we quote the upgrade work up front. Details and local price ranges are on the Garage Conversion Contractor in Pasadena page.
ADU Builders in Pasadena
Backyard ADUs in Pasadena range from factory-built prefab units to conventional stick-frame construction, and the right choice depends on your lot width, access for equipment, and how the city classifies your property. We work with Abodu, Cover, and Dvele for prefab options, and we build conventional ADUs with James Hardie siding where a custom footprint or a hillside lot calls for it. Every Pasadena ADU we build gets a written scope, a fixed price, and the full one-year written guarantee. See the full breakdown on the ADU Builders 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
We install and finish ADUs and additions built on Abodu, Cover, and Dvele platforms, and we side conventional builds with James Hardie fiber cement. We stock the trim, flashing, and hardware those systems call for, which keeps Pasadena jobs from stalling on parts. See our brands for the complete list.
Pricing for ADU Company in Pasadena, CA
| Service | Typical range in Pasadena |
|---|---|
| Detached ADU (conventional build) | $175,000 – $325,000 |
| Detached ADU (prefab, 1-bedroom) | $140,000 – $220,000 |
| Detached ADU (prefab, 2-bedroom) | $180,000 – $280,000 |
| Garage conversion (attached) | $95,000 – $160,000 |
| Garage conversion (detached) | $115,000 – $185,000 |
| Primary suite addition | $140,000 – $240,000 |
| Second-story addition | $225,000 – $400,000 |
| Living/family room bump-out | $90,000 – $170,000 |
Hillside lots, protected trees, and foundation replacement are the three things that push Pasadena prices above the midpoint. We put the price in writing before any work starts, and the number you approve is the number on the final invoice.
Neighborhoods We Serve in Pasadena
We work across Pasadena, from the flat streets south of Colorado Boulevard up into the foothill neighborhoods where lots get steeper and the plan-check questions get more specific.
- Bungalow Heaven
- Madison Heights
- Linda Vista
- Annandale
- San Rafael
Response time across the city is typically one to two business days for an estimate visit, depending on where you are in the permit queue.
Service Area – Cities Near Pasadena
Our Pasadena crews also work in the neighboring cities where the housing stock and permit expectations are similar. We serve San Marino, CA, South Pasadena, CA, Altadena, CA, and San Gabriel, CA. Each city has its own plan-check quirks, and we price and permit accordingly.
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
Plan review in Pasadena typically takes three to six months depending on whether your lot is in a hillside overlay or a historic district. We start with a site visit, a written scope, and a fixed price, then we handle the plans, the permit submittal, and the revisions. Call (361) 315-4177 for a current timeline on your specific lot.
In Pasadena, a homeowners association can impose architectural standards but cannot legally block an ADU that meets state and city requirements. We review your HOA’s CC&Rs before we finalize plans so there are no surprises, and we’ll tell you plainly if a specific design element will trigger review. Call (361) 315-4177 and we’ll walk through it.
Yes. We pull every permit for Pasadena ADUs, garage conversions, and room additions, and we schedule the inspections. The city’s plan checker sees our drawings regularly, and we build to the details that pass the first time. Call (361) 315-4177 to talk through your 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
"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."Room addition over the back patio. Framing is square, windows are tight, and the roofline matches."
- Danny L."Foundation and slab poured on schedule. Crew kept the yard orderly."
- Marian J.
