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PGT Home Additions & ADU: The San Francisco Owner’s Guide
PGT home additions and ADU construction in San Francisco typically runs $53,100 to $153,400, and the work is quoted in writing before the first tool comes out. That’s the range for a full addition or accessory dwelling unit built to current California code, with permits pulled and inspections passed. Most San Francisco homeowners call us because an existing part of their addition, often a window, door, or exterior sealing component from PGT, has failed and they need to know whether they’re looking at a repair or a rebuild. The answer depends on what failed, where it sits, and what the fog and salt air have done to the framing around it.
We’re Bradford Remodeling Co San Francisco, an independent contractor. We’re not affiliated with PGT, but we work with their products and other premium brands every week. If you’ve got a failing PGT component in a home addition or ADU, here’s the straight read on what it costs, what’s worth repairing, and when a full replacement is the only honest answer.
Which PGT Models This Applies To
PGT makes two product families that show up most often in San Francisco home additions and ADUs: their WinGuard impact-rated window and door lines, and their Standard Series windows and sliding glass doors. The WinGuard units are the ones we see in ADUs built to current code, especially in the more exposed neighborhoods like the Outer Sunset and Richmond District, where wind-driven rain is a real thing. The Standard Series shows up more in older additions, built before the city tightened its energy and impact requirements.
Here’s the compatibility gotcha: PGT WinGuard frames are deeper than Standard Series frames. A homeowner can’t swap a Standard Series sash into a WinGuard frame, even if the glass measurements match. The frame profile is different by about three-eighths of an inch, and the hardware mounting points don’t line up. If you’re replacing a failed component, the model number is printed on a sticker inside the frame channel on the side jamb. Pull the sash toward you and look for a PGT label with a series code starting with “WG” or “STD.” That code tells us exactly what we’re ordering or pulling from stock.
For OEM versus aftermarket: PGT’s own replacement parts carry the manufacturer’s warranty and are spec-matched to the frame. Quality aftermarket equivalents exist for things like balance springs, rollers, and weatherstripping, and we’ll use them when they’re genuinely equal. But for structural components, especially impact-rated glass and frame sections on a WinGuard unit, we order OEM. The cost difference isn’t worth the risk on a unit that’s supposed to hold up to flying debris.
Styles & brands we work with
Signs Your PGT Home Addition or ADU Component Is Failing
- Fogging or condensation between glass panes. This means the seal on an insulated glass unit has failed. In San Francisco’s marine climate, once that seal goes, the window’s thermal performance drops fast and the glass starts looking milky. The fix is a new glazing unit, not a polish.
- The sash sticks, drops, or won’t stay open. Most often this is a failed balance spring or worn pivot bar. On PGT WinGuard units, the added weight of impact glass puts more stress on these parts, so they fail earlier than on a standard window.
- Water staining on interior drywall below a window or door. This usually means the exterior flashing or the PGT weep system is clogged or damaged. In San Francisco fog-belt neighborhoods, this moisture gets into the wall cavity and rots the framing over time. Skip repair here and the addition’s whole corner can go bad.
- Drafts you can feel around the frame on a windy day. Weatherstripping degrades, but if you feel air movement even after re-sealing, the frame may have shifted or pulled away from the rough opening. That’s a structural check, not a caulking fix.
- Hairline cracks radiating from the corner of the frame or stucco around it. This can signal settling, but more often it means the original rough opening wasn’t loaded properly and the unit is carrying weight it shouldn’t be. Letting this go means eventually the frame itself cracks.
Replacement Cost & What’s Included
Here’s the honest pricing picture for San Francisco. A full home addition runs $53,100 to $153,400. A complete ADU construction runs $106,200 to $259,600. A garage conversion sits at $35,400 to $94,400. If what you actually need is a component-level fix, like a new PGT impact window installation, that’s $9,440 to $29,500, and a standard window replacement runs $5,310 to $17,700.
What drives the spread on additions and ADUs is the foundation work, the plumbing and electrical rough-in, and whether the site needs seismic upgrades. A flat slab in the Sunset costs less to build on than a sloped lot in Glen Park. Every Bradford Remodeling job includes a written line-item price before work starts, so you’ll see exactly what’s in the number. No change orders at the door. And every completed job carries the 365-Day Done Right Promise: if the work fails within a year, we come back and fix it at no charge.
| Scope | San Francisco Range |
|---|---|
| Full Home Addition | $53,100 – $153,400 |
| ADU Construction | $106,200 – $259,600 |
| Garage Conversion | $35,400 – $94,400 |
| Impact Window Installation | $9,440 – $29,500 |
| Standard Window Replacement | $5,310 – $17,700 |
Every part we install, whether it’s an OEM PGT glazing unit or a quality aftermarket balance spring, is priced out before we order it. You’ll know the parts cost, the labor cost, and the warranty term in writing.
DIY or Call Us?
There are a few things a homeowner can safely check. You can read the PGT model sticker to identify your series. You can clean out weep holes on the bottom track of a sliding door. You can check weatherstripping for obvious tears. That’s about it, and those checks are worth doing before you call, because knowing your model code saves us time and you money.
What you shouldn’t do is pull a WinGuard sash or attempt to remove impact-rated glass. Those units are heavy, the balance systems are under real tension, and a dropped sash can take a hand with it. We’ve also watched homeowners strip the mounting screws on a PGT frame trying to force a part that wasn’t spec-matched. If the part is structural, load-bearing, or tension-loaded, that’s a call to (831) 610-5598. We’ll send a background-checked, uniformed technician who knows exactly what he’s looking at.
See the difference
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AfterHow long does a PGT home addition or ADU last in San Francisco?
A properly built home addition or ADU in San Francisco should last 50 years or more on its structural frame, but exterior components like windows, doors, and weather seals will need replacement every 15 to 25 years, depending on exposure. In fog-belt neighborhoods, that timeline shortens because salt and moisture work on metal frames and hardware faster than in drier parts of the city. The PGT components we see failing at the 12- to 18-year mark are almost always from weather exposure, not manufacturing defects.
Can a failed PGT window or door be repaired instead of replaced?
Yes, in most cases. Failed glass seals, worn balance springs, failing rollers, and damaged weatherstripping are all repairable. The repair makes sense as long as the frame itself is sound and the unit was installed plumb and level. We’ll tell you if a repair is worth it or if you’re pouring money into a frame that’s already twisted. Call (831) 610-5598 and we’ll give you a straight answer.
How long does it take to replace a failing PGT component?
A standard window or door component swap, like a glazing unit or a balance spring, is usually done same-day once we have the part. A full window or sliding door replacement takes one to two days, including sealing and interior trim. A full addition or ADU runs months, and we’ll put that timeline in writing before we start. The schedule depends on the scope, the permits, and what we find when the walls come open.
Do you stock PGT replacement parts in San Francisco?
We carry a range of common PGT-compatible parts on our trucks, including balance springs, rollers, weatherstripping, and hardware kits for the Standard Series and WinGuard lines. Specialty glazing units and impact-rated glass are ordered per job from PGT’s distribution network, which usually takes a week or two. If you need a specific part, call (831) 610-5598 and we’ll check stock before you wait.
Bradford Remodeling has been part of the Garrison Partners family since 2004, and every job we do in San Francisco is held to The Garrison Standard: written price, documented scope, background-checked crew, and a signed guarantee in your hand at close-out. Curtis Lane is the owner. He grew up swinging a framing hammer in Los Angeles, trained in construction technology at LATTC, and has spent years working through San Francisco’s older housing stock, including a stretch of fog-belt gut-and-rebuilds in the Outer Sunset that taught him exactly how moisture moves through balloon-frame walls. He’s the one who makes sure your scope document is tight and your phone call gets returned.
Straight number, real scope, no surprises at close-out.
If you need a PGT home addition or ADU component repaired or replaced in San Francisco, call (831) 610-5598 today. We’ll send a technician, identify the part, and put the price in writing before any work starts.
Written by Curtis Lane, Owner, Bradford Remodeling Co – San Francisco, CA at Bradford Remodeling Co San Francisco, serving San Francisco and nearby areas.
