CGI Home Additions & ADU Nationwide

CGI Home Additions & ADU: The Anaheim Owner’s Guide

We stock and install CGI-compatible window and door systems for home additions and ADU projects in Anaheim, with typical installed pricing from $45,000 to $130,000 for full additions and $90,000 to $220,000 for detached ADUs. Most CGI window and door replacements within an existing addition can be quoted same-day and scheduled within a week. Homeowners usually discover a problem when they notice drafts around CGI frames, condensation between glass layers, or hardware that no longer latches properly after years of thermal cycling in Anaheim’s inland heat.

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Which CGI Models This Applies To

CGI’s product lines for residential additions and ADUs fall into several series, and matching the right replacement part or unit requires reading the etched marking on the glass spacer or the label inside the frame channel. The Estate Series, Sentinel Series, and Targa Series each use different frame depths, glazing beads, and hardware mortise locations. Estate Series units typically carry a 2-5/8 inch frame depth with a beveled exterior profile; Sentinel uses a square-edged 2-3/8 inch frame designed for impact ratings up to HVHZ standards. Targa splits the difference at 2-1/2 inches and uses a distinct glazing bead retention clip that is not interchangeable with Estate.

For replacement windows in an existing CGI addition, the critical measurement is the daylight opening, not the frame outside dimension, because the nailing fin or retrofit flange determines how the unit seats in the rough opening. We have seen Anaheim homeowners order based on the sash size alone and end up with a unit that gaps at the fin or compresses the weatherstrip. OEM CGI parts ship from the Florida manufacturing facility with a four-to-six-week lead time; we also source quality aftermarket equivalents from Kawneer and C.R. Laurence for hardware and weatherstrip components that match CGI specifications without the OEM wait. The decision between OEM and aftermarket usually comes down to whether the project needs to match existing frame colors exactly, CGI’s color palette is proprietary, or whether a close match on a white or bronze unit will suffice.

Signs Your CGI Home Additions & ADU Is Failing

• Condensation between glass panes. This means the insulated glass unit (IGU) seal has failed, allowing moist Anaheim air into the spacer channel. The desiccant inside the spacer becomes saturated, and the fogging will worsen until the glass is opaque; the fix is IGU replacement, not a wipe-down.
• Difficulty latching or locking. CGI’s multipoint locking systems rely on a master handle driving rods into keepers at multiple frame points. Salt air from coastal Orange County migration, or simply a decade of dust intrusion in Anaheim’s dry summer heat, causes the rod guides to bind or the keepers to wallow out.
• Draft at the sash perimeter. Compression weatherstrip loses its memory after roughly 8 to 12 years in California’s UV exposure. When you can feel air movement with the window closed, the bulb seal or fin seal has flattened beyond recovery.
• Frame corner separation or sealant cracking. CGI frames are mechanically joined and sealed at the corners; thermal expansion in Anaheim’s 100-degree summer afternoons against 50-degree winter mornings stresses the corner keys and sealant beads. Visible gaps at the miter mean water can weep behind the exterior trim.
• Excessive noise transmission. If street noise from Katella Avenue or the 5 Freeway suddenly seems louder, the laminated glass layer may have delaminated, or the frame is no longer making full contact with the surround. Impact-rated CGI units depend on glass-to-frame continuity for their STC rating.

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Replacement Cost & What’s Included

For a CGI window or door replacement within an existing Anaheim home addition or ADU, installed costs typically range from $800 to $2,500 per opening for standard sizes, with full addition projects running $45,000 to $130,000 and detached ADU construction at $90,000 to $220,000. What drives the range: unit size, whether the opening needs reframing for current California Title 24 energy code, exterior finish repair after the old unit comes out, and whether the project triggers permit requirements with the City of Anaheim.

Our quotes itemize parts and labor separately: the CGI or equivalent unit, installation labor, exterior sealant and flashing, interior trim repair or replacement, and debris haul-away. Under Clause 1 of The Haven Standard, that written price is delivered before any work starts. Every installation carries our 365-Day Done Right Promise, and we pull permits and pass inspections as part of the scope, not as a surprise add-on.

DIY or Call Us?

An owner can safely check a few things: confirm the etched marking on the glass for the IGU size, photograph the hardware and any label residue for identification, and verify whether the issue is weatherstrip (user-replaceable on some CGI series) or glass (not user-replaceable). What goes wrong with DIY on window and door units is the sequence: removing a unit without proper support risks frame racking, and reinstalling without a level, square, and properly flashed rough opening traps water behind the wall. We have been called to Anaheim jobs where a homeowner’s self-installed unit leaked for two years before the drywall showed the stain. For anything involving the IGU, the multipoint lock mechanism, or frame replacement, the proper tools and sequencing matter more than the part cost. Call (562) 245-4592 and we’ll quote it in writing.

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