Block-frame swap with no stucco cut. The fast, clean option for LA stucco homes when the existing frame is sound. Milgard, Anlin, Marvin, Andersen. Lifetime install warranty. Quote in 48 hours.
Block-frame retrofit is the most common window install in Los Angeles — and the most often misapplied.
The reason retrofit dominates SoCal is structural: most LA tract homes built between 1985 and 2005 are stucco over wood frame with aluminum window fins set behind the lath. Cutting stucco to do a full-frame replacement means demolishing two to three inches of finish around every opening, then patching, color-matching, and waiting two weeks for the new stucco to cure before paint. On a 12-window Granada Hills ranch, that adds $6,000–$9,000 and three weeks to the job. Block-frame retrofit skips all of that — we leave the existing aluminum or vinyl frame in place and set the new window inside it, sealing to the original fin from the outside. One day on site for most homes, no stucco patch, no paint touch-up.
The trade-off is glass area. A retrofit window sits inside the old frame, so you lose roughly 1" of visible glass on each side — about 8% of the daylight opening on a typical 36×48 window. We show you a tape-measure mockup at the consult so it's not a surprise on install day. The other trade-off is what we can't see: with the old frame staying in place, we can't inspect the rough opening for hidden water damage, dry rot, or termite work. On a 1995 Porter Ranch home that's usually fine. On a 1962 Burbank home that had a roof leak in 2008, it's a problem we'll never find until the wall comes apart.
The cutoff we use is roughly 25 years and visible condition. Anything post-1985 with intact stucco, no interior staining, and a sound frame is a retrofit candidate. Anything older, anything with paint bubbling near the sill, or anything where the existing frame is bent, corroded, or out of square is a full-frame job. We tell you which bucket you're in at the measure — and we walk away from retrofits that should be full-frame, even if you push us.
All-in per-window pricing for block-frame retrofit (labor, sealant tape, Title 24 docs, disposal). Whole-project bands: $3,000–$10,000 for typical 4–10 window jobs.
Three questions answer it. First: how old is the home? Pre-1985 means original aluminum framing that's almost always corroded or out of square at the sill. We see this constantly on Burbank, Glendale, and Eagle Rock homes from the 1950s–70s — the aluminum looks fine until you push on it and the corner separates. Those are full-frame jobs every time. Post-1985 vinyl or aluminum framing in intact stucco is the retrofit sweet spot.
Second: what does the sill area look like from the inside? Paint bubbling, drywall stains, soft trim, or a musty smell within four feet of any window means moisture has found a path. Retrofit traps that path inside the wall — we have to open it up to find the source. If you've had a roof issue, a stucco crack repaired in the last decade, or sprinklers hitting the wall, we recommend full-frame on at least the affected elevations.
Third: do you care about the glass area? On a Porter Ranch or Northridge tract home with standard 36×48 windows, losing an inch on each side reads as a thicker frame — most homeowners don't notice after a week. On a mid-century Sherman Oaks home with a wall of windows facing the canyon, that same inch is the view. We do mockups with masking tape on the existing glass at the measure so you decide before you sign, not after install.
Retrofit looks easy, which is why it gets done wrong constantly. Every one of these is a callback we've fixed on someone else's install.
Every step has a deliverable, a name, and a fixed date. If we miss a date, we credit you $250 — written into your contract.
"Got three retrofit quotes in Granada Hills. Two contractors said one day and didn't mention the glass loss. Theo brought painter's tape, mocked up the new frame on our existing window, and said 'this is what you'll see.' We went with him. Six Anlins, done by 4pm, no stucco touched."
"1992 Burbank stucco home. Another contractor was ready to retrofit eight windows. Red Stag's moisture meter found the kitchen sill at 24% — there was a slow leak from the roof valley above. They stopped, recommended full-frame on that one, retrofit on the other seven. Found rot we never would have caught."
"Glendale tract home, 2001 build, all original Milgard aluminum. We just wanted vinyl retrofits — fast and cheap. Crew showed up at 8, eight windows in by 5, butyl tape all visible before the trim went on. Final inspection passed first try. $9,200 all-in."
Strongest in the Valley and east-side stucco belt — same crew, same trucks, same 45-minute drive if a sealant joint pops in 2031.
No deposit to quote. Moisture meter on every sill at the consult. Quote within 48 hours of measure. We'll tell you if retrofit is wrong for your home — even if you wanted to hear yes.
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