CGI Home Additions & ADU Nationwide

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

We stock and install CGI-compatible components for home additions and ADU projects in Campbell, with installed work typically falling between $45,000 and $130,000 depending on scope, and we can often begin assessment same-week for active failures. Most Campbell homeowners discover an issue when their addition’s window or door systems no longer seal properly against the coastal moisture that rolls in from the Santa Cruz Mountains, or when thermal expansion gaps appear after a few seasons of our wide temperature swings.

Call (831) 704-1211

Which CGI Models This Applies To

CGI manufactures impact-resistant windows and doors under several series lines, and the part you need depends on when your home addition or ADU was built. The Estate Series, Sentinel Series, and WinGuard lines each use distinct frame extrusions and glazing packages that are not cross-compatible. Check the etched mark in the glass corner or the sticker on the frame jamb for a model prefix: ES-, SE-, or WG- followed by a four-digit size code. The Estate Series, common in Campbell additions from 2012 to 2019, uses a 3-1/4 inch frame depth that differs from the Sentinel’s 2-7/8 inch profile, so ordering by rough opening alone will get you a part that does not seat.

We source OEM CGI components direct from the Florida manufacturer, though for certain fixed-glass units we also stock PGT aftermarket equivalents that match the Miami-Dade impact rating at a lower per-unit cost. The decision hinges on whether your original unit carries a specific Florida Product Approval number required by your Campbell permit file. We check that before ordering.

Signs Your CGI Home Additions & ADU Is Failing

• Condensation between panes. The insulated glass unit’s edge seal has failed, which happens faster in Campbell than inland because our marine layer keeps exterior surfaces damp during morning temperature inversions. The desiccant inside the spacer bar saturates, and the view turns permanently foggy.
• Difficulty latching or dragging sashes. The balance system or hinge hardware has corroded, often from salt residue carried on afternoon bay breezes. The mechanism binds instead of gliding, and forcing it bends the track.
• Visible frame separation at corners. Thermal cycling between our 40-degree winter nights and 90-degree summer days stresses the mechanical corner joints. CGI’s earlier screw-and-plate corners are more prone to this than their later fusion-welded frames.
• Water staining on interior drywall below the unit. The weep holes are clogged with pollen and dust from the dry summers, or the sill pan was omitted during original installation. Water finds the path of least resistance inward.
• Cracked impact glass with intact laminate. The outer lite took a hit from debris or thermal stress, but the interlayer is holding. This is a safety success for impact-rated glass, though the unit still needs replacement to maintain the rating.

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Replacement Cost & What’s Included

The range reflects three factors: unit size, whether the original nail fin is intact or requires reframing, and whether your Campbell permit requires a current Florida Product Approval number that the original unit lacks. Our quote includes removal, disposal, new unit, sealant, interior and exterior trim repair, and a documented photo record of the rough opening condition before we close it up. Under Clause 1 of the Haven Standard, the price is written before anyone starts. The 365-Day Done Right Promise covers installation workmanship; the CGI factory warranty covers the unit itself.

DIY or Call Us?

An owner can safely check the model label and photograph any damage for documentation. Beyond that, CGI impact units weigh 40 to 80 pounds each depending on size, and the installation requires proper shimming, structural fastening to shear walls, and continuous sealant application that maintains the impact rating. Campbell’s building department will want to see the Florida Product Approval documentation on any replacement in an addition or ADU, and we include that permit support as standard.

Improperly installed impact windows fail structurally exactly when you need them to perform. We’ve replaced three DIY attempts in the Pruneyard area alone in the past year, each requiring reframing that added $1,800 to $3,400 to what should have been straightforward. If you’re weighing the decision, call (831) 704-1211 and we’ll walk through what your specific unit needs - no charge for the conversation.

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