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CGI Home Additions & ADU: The Pasadena Owner’s Guide
CGI home additions and ADU construction in Pasadena typically runs $45,000 to $130,000 for a full addition, or $90,000 to $220,000 for a detached ADU, depending on foundation work, roof tie-ins, and finish level. We don’t sell CGI panels as a product line, and we’re not affiliated with CGI the manufacturer. What we do is build the residential additions and ADUs that Pasadena homeowners are planning, and we do it with a written price in your hands before a single drop cloth goes down.
Most people reach this page because they’ve been researching manufactured panels and modular options, or they’ve heard CGI mentioned by a designer or a neighbor and want to know if it’s right for their lot. Either way, the question underneath is the same: what will this cost, and who will actually build it well? That’s the conversation Graham Stein has been having with Pasadena families for nearly two decades, and it’s one we’re glad to have with you.
Key Takeaways
- Home additions in Pasadena range from $45,000 to $130,000; detached ADUs run $90,000 to $220,000.
- Elmstead Remodeling Pasadena is an independent contractor, not a CGI dealer or installer.
- Written line-item pricing is provided before any work starts, every time.
- 365-Day Done Right Promise covers every completed project.
- Call (626) 714-2992 and a live person answers, 24/7.
Which CGI Models This Applies To
If you own a home with CGI windows, doors, or exterior panels already in place, you already know the brand makes a serious product. CGI is best known for impact-rated hurricane windows and doors, built for coastal Florida and Gulf conditions. Here in Pasadena, those same products show up on higher-end remodels where homeowners want the added noise reduction and the structural confidence that impact glass provides, even though we don’t face hurricane wind loads in the San Gabriel Valley.
The compatibility question matters most when you’re tying an addition into an existing home that has CGI windows or doors. The manufacturer’s product lines have specific frame depths, nailing fin configurations, and mullion patterns. If your original installation used CGI’s Estate Collection or the Sentinel series, for example, matching those exact sightlines in a new bedroom addition means sourcing from the same series, not just the same brand. An aftermarket window that looks close from across the room will not look close from four feet away, and you’ll notice every day.
What we do when a Pasadena homeowner wants to match existing CGI products is this: we document the existing units during the estimate walkthrough, pull the model labels if they’re visible, measure the glass thickness and frame depth, and then specify the addition’s windows and doors to match. If the existing product has been discontinued, we’ll tell you that plainly, and we’ll show you the closest current-series match before we write the contract. You’ll know exactly what you’re getting before you sign.
Styles & brands we work with
Signs Your CGI Home Additions & ADU Is Failing
To be direct: home additions and ADUs don’t “fail” the way a water heater does. But the products inside them can fail, and the structure itself can show real problems if the original work was rushed. Here’s what we see in Pasadena:
- Water staining at the roof tie-in. The most common failure point on any addition is where new roof framing meets old. If flashing was reused or underlapped, you’ll see staining on the ceiling within two rainy seasons. Pasadena’s winter storms find every shortcut.
- Stucco cracks radiating from window corners. This usually means the window opening wasn’t properly flashed and the surrounding wall is flexing more than it should. CGI windows are heavy, and the rough opening needs to carry that weight correctly.
- Doors that no longer latch cleanly. When an addition settles differently than the original structure, interior doors bind or drift. A quarter-inch of movement is normal; a door that won’t close at all isn’t.
- Electrical circuits tripping in the new space. If the addition was wired as an afterthought off an existing circuit, you’ll trip breakers whenever a space heater and a hair dryer run at the same time. Older Pasadena homes built before 1950 often have 100-amp panels that were already near capacity.
- HVAC imbalance between old and new spaces. If the addition is always ten degrees warmer or colder, the original system wasn’t sized for the added square footage. In Pasadena’s summer heat, that’s not a comfort issue; it’s a daily frustration.
See the difference
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AfterReplacement Cost & What’s Included
For a full Pasadena home addition, the installed range is $45,000 to $130,000. That covers architectural drawings if needed, foundation, framing, roofing tie-in, electrical, plumbing, drywall, flooring, paint, and finish materials. The spread comes down to size, site access, and whether you’re matching CGI-level windows and doors or working with more standard products.
A detached ADU runs $90,000 to $220,000 in Pasadena. That’s a wider range because it includes everything from a compact 400-square-foot studio to a two-bedroom unit with a full kitchen and laundry. The city’s ADU permitting process has its own rhythm, and we handle all of it: plans, permits, inspections, and the final sign-off.
What’s included in our price, every time: a written line-item scope before work starts, the materials named by brand, the labor broken out, and the permit fees listed. No allowance games. No “we’ll settle up at the end.” The price you see on paper is the price you pay at the end – no footnotes. And every project carries our 365-Day Done Right Promise: if it’s not done right, we make it right.
DIY or Call Us?
A home addition or ADU is not a DIY project, and any contractor who suggests otherwise is not doing you a favor. The safety concerns are real: roof framing is structural, electrical work can kill, and an improperly flashed addition will rot from the inside out. This is work that requires permits, inspections, and a crew that knows Pasadena’s specific building codes.
What you can do before calling us: walk your lot, think through where the addition would sit, and make notes on how you want the space to feel. That’s useful. What you shouldn’t do: start demo, pull your own permits, or hire a handyman who says he can “figure out the foundation part.” We’ve repaired too many of those projects. If you’re in Pasadena and even considering an addition or ADU, call (626) 714-2992. The estimate is free, the written price comes before anything starts, and a live person answers the phone.
FAQs
Plan for four to seven months from permit approval to final inspection for a typical addition, and five to nine months for a detached ADU. Pasadena’s permitting and inspection schedule adds time compared to surrounding cities, and we factor that into the timeline we give you at contract signing rather than discovering it halfway through.
Yes, we can. We document your existing CGI product labels, frame depths, and series during the estimate walkthrough, then specify the new windows and doors to match as closely as the current product line allows. If the series has been discontinued, we’ll show you the closest current match before we write the contract.
If the issue is isolated – a failing roof tie-in, a bad flashing detail, one undersized circuit – yes, that’s a repair and it’s a much smaller scope. If the original addition has structural problems across multiple systems, the honest answer is often that partial fixes leave you chasing the same issues in a different corner. We’ll tell you which situation you’re in, with reasons you can see.
Yes. We prepare and submit the plans, manage the permit process with the city, schedule inspections, and stay on the job until final sign-off. You’ll know the permit status at every step because we talk to you, not around you. Call (626) 714-2992 and we’ll walk through it.
Written by Graham Stein, Owner, Elmstead Remodeling Pasadena at Elmstead Remodeling Pasadena, serving Pasadena and nearby areas.
