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PGT Home Additions & ADU: The San Francisco Owner’s Guide
If you have a PGT window or door product and you’re planning a home addition or ADU in San Francisco, the part you’re usually looking for is the matching PGT window, door, or impact-rated glass unit that lets the new space tie into the existing house without a visible seam. Home additions in San Francisco typically run $53,100 – $153,400, and ADU construction runs $106,200 – $259,600, with the PGT-specific components like impact windows, sliding glass doors, and French doors representing a meaningful share of that number. Most owners discover they need PGT-matched parts when an existing window or door fails during a remodel, or when the city’s planning review flags the project because it sits in a coastal wind zone that requires specific impact-rated glazing.
We’re Elmstead Remodeling San Francisco, a Cedarwell company. We’re an independent remodeling contractor, not affiliated with PGT, but we work with PGT windows and doors on additions and ADUs throughout the city on a regular basis. If a PGT part has failed or you need to match existing PGT products in the new construction, we can identify it, source it, and install it, with a written price before any work starts.
Key takeaways:
- Home additions in San Francisco: $53,100 – $153,400
- ADU construction in San Francisco: $106,200 – $259,600
- PGT parts we typically handle: impact windows, sliding glass doors, French doors, transoms, and the flashing kits that keep water out of the new framing
- We’re an independent contractor, not a PGT dealer or affiliate
- Written price before any work starts, every time
Author: Graham Stein, Owner, Elmstead Remodeling San Francisco, grew up in Los Angeles and learned the trade at Los Angeles Trade-Technical College before spending nearly three decades on job sites across California. He and his team have completed kitchen and bathroom renovations throughout San Francisco, from the Sunset District to jobs within walking distance of Dolores Park.
Which PGT Models This Applies To
The PGT product line most relevant to San Francisco additions and ADUs is the WinGuard series, which includes impact-rated casement windows, single-hung and horizontal roller windows, sliding glass doors, and French doors. WinGuard products carry a Miami-Dade NOA (Notice of Acceptance), which matters in San Francisco because the city’s coastal wind zones can trigger impact-glazing requirements on any addition or ADU that changes the building envelope.
Owners with older PGT products sometimes have the SpectraGuard or PremierVue lines, which are more common in inland California and Arizona. The compatibility gotcha we see most often is this: a WinGuard sash will not swap into a SpectraGuard frame, even if the rough opening dimensions match. The frame profiles are different by design, and forcing a mismatch voids the PGT warranty and typically leaks at the sill. If you can’t find a label, measure the frame depth, not the glass size. WinGuard frames are noticeably deeper, usually 2-5/8 inches or more for impact-rated aluminum.
For OEM versus aftermarket: for the glass and the frame, we always recommend OEM PGT. The impact rating is a tested assembly, not just a pane of glass, and substituting aftermarket glass in a PGT frame breaks the certification. For peripheral parts like weatherstripping, rollers, and handles, quality aftermarket equivalents are often fine and cost less, but they need to match the PGT part number or the profile won’t seat correctly.
Styles & brands we work with
Signs Your PGT Home Additions & ADU Components Are Failing
- Condensation between the glass panes. This means the insulated glass unit’s seal has failed. The argon gas has escaped, and the window is no longer performing thermally. In San Francisco’s damp marine air, failed seals fog quickly and never clear. The fix is a new IGU, not just a wipe-down.
- Difficulty sliding a PGT patio door. Rollers wear out, especially in houses near the ocean where salt air accelerates corrosion. If the door needs a hip-check to move, the rollers are likely flat-spotted or the track is pitted. Continuing to force it bends the door leaf and turns a $40 roller job into a frame replacement.
- Water staining on interior drywall below a PGT window. That’s usually a failed flashing integration where the window meets the new addition’s framing. San Francisco’s winter rains expose this within the first or second season. The window itself may be fine; the installation detailing is the problem.
- A PGT casement window that won’t crank or won’t stay open. The operator mechanism has stripped gears or a hinge arm is bent. Parts are specific to the crank style (fold-down versus knob), and guessing wrong means another trip to the supplier.
- Visible gaps at the corners of a PGT door frame after the addition settles. This is common in San Francisco where ADUs built on sloped lots settle at different rates than the main house. The gap is usually repairable at the framing level, but it should be addressed before it lets water in or makes the door bind.
Replacement Cost & What’s Included
If the PGT components are being installed as part of a full home addition in San Francisco, the project range is $53,100 – $153,400. If it’s an ADU, $106,200 – $259,600. Within that, a single PGT WinGuard impact window typically runs $944 – $2,950 installed, and a PGT sliding glass door runs $2,360 – $7,670 installed. These are the numbers we give homeowners before any work starts, and the written price does not change once the crew arrives.
What drives the range on the PGT portion specifically: the number of openings, the sizes, whether the units are impact-rated or standard, whether the existing frames can be reused or need full replacement, and whether the city’s review requires upgraded glazing in the new addition. We itemize the parts and labor separately so you can see exactly what the PGT materials cost versus what the installation costs. Our workmanship is covered by the 365-Day Done Right Promise: if it’s not done right, we make it right.
See the difference
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AfterDIY or Call Us?
For a failed PGT window or door, there are things you can safely check yourself. Look for the product label on the frame edge to identify the series. Note whether the glass is insulated (two panes with a spacer) or impact (usually heavier, with a visible laminate layer). Take a photo of any visible damage to the track, roller, or hinge. That information helps us get the right part on the first trip.
Where DIY goes wrong is when the repair involves lifting a PGT door leaf out of its frame, removing an impact-rated window sash, or cutting new flashing. PGT impact doors are heavy, often 180 pounds or more for a standard 6-foot panel, and the glass is a tested assembly; dropping it breaks both the part and the certification. If the job requires removing the unit from the opening, call us at (831) 480-4497. We’ll bring the right part and a written price before anything gets touched.
FAQs
In the San Francisco climate, PGT aluminum frames typically last 30 to 40 years before the metal shows meaningful corrosion, while the insulated glass units and moving hardware usually need attention at the 15 to 20 year mark. Homes close to Ocean Beach or the Presidio tend to see roller and hinge failures sooner because of salt air. Call (831) 480-4497 if you’d like us to look at what you’re seeing, and we’ll give you an honest read on what needs replacing and what doesn’t.
It depends on the failure. Weatherstripping, rollers, handles, and crank operators are repairable with OEM or matched aftermarket parts. Once the glass seal has failed or the frame is pitted or bent, replacement is the better investment. Tell us what the room needs to do, and we’ll figure out the rest from there. Call (831) 480-4497 and we’ll assess what’s repairable versus what should be replaced.
A standard PGT window or sliding door replacement takes one day for a single opening, assuming the rough opening is sound. If we’re integrating multiple PGT products into new addition framing, the window and door work typically spans three to five days within the larger project timeline. We’ll give you a written schedule before the job starts so you know what to expect. Call (831) 480-4497 for a free estimate for your specific project.
We don’t warehouse PGT products, but we source them quickly through established supply channels and we’ve built additions and ADUs across San Francisco using PGT products. What we do keep is the peripheral hardware, rollers, weatherstripping, and flashing that usually go at the 15-year mark. If you need a PGT part identified or matched, call (831) 480-4497 and we’ll sort it out.
Get Your Free Estimate
If you’re planning a home addition or ADU in San Francisco with PGT windows and doors, or if an existing PGT product has failed and needs attention, call us at (831) 480-4497. Graham Stein and the Elmstead Remodeling San Francisco team will walk the project with you, name the parts, and put the price in writing before any work starts. That’s how we’ve done it since 2005, in every neighborhood from the Sunset District to Noe Valley.
Written by Graham Stein, Owner, Elmstead Remodeling San Francisco at Elmstead Remodeling San Francisco, serving San Francisco and nearby areas.
