How Much Does Window Replacement Cost in Los Angeles?

Window replacement is the least glamorous line on any remodel budget and one of the easiest to get wrong. The bids arrive with a per-window price and no explanation of why one contractor is at $500 and another at $1,400 for what looks like the same job. Here is what actually drives the number in Los Angeles. These are typical Los Angeles market ranges, not a quote.

The numbers

Scope	Typical LA range	Notes
Vinyl dual-pane, retrofit	$450–$900 per window	New unit inside existing frame
Vinyl dual-pane, full-frame	$750–$1,600 per window	Includes stucco or siding patch
Fiberglass or aluminum-clad	$1,200–$2,000 per window	Better frames, narrower sightlines
Wood, historic-profile	$1,500–$2,500+ per window	Often required in landmark districts
Header replacement (resizing)	$400–$1,000 per opening	Structural — needs plan check
Express Permit (like-for-like)	$250–$700 typical	Issues in 1–3 business days
Typical 15–20 window house, retrofit	$9,000–$18,000
Typical 15–20 window house, full-frame	$14,000–$30,000

Roughly 60–70% of a retrofit bid is the window itself; on a full-frame job labor and patching climb toward half. That is the whole reason the two methods price so differently.

Retrofit or full-frame: the decision that moves the money

Retrofit installs a new window inside the frame you already have. There is no stucco cutting, no interior trim damage, and the crew moves through a house at eight to twelve openings a day. It is the right answer for most 1950s–1980s LA homes with aluminum sliders in sound frames.

Full-frame takes the opening down to bare framing. It costs 25–50% more and adds a stucco patch that never quite matches the surrounding wall until it is painted. You do it anyway when the existing frame is rotted or rusted, when water has been getting past the flashing, when you are changing the size or shape of the opening, or when the frame is a nailing-fin unit in a wood-sided wall.

The trade-off nobody mentions on the sales call: a retrofit frame sits inside the old one, so you lose roughly an inch of glass on each side. On a big picture window nobody notices. On a small bathroom or bedroom window it is the difference between a legal egress opening and a failed inspection.

What changed on January 1, 2026

California's Title 24 energy code tightened for window replacement this year, and it caught a lot of homeowners mid-project. For a full replacement the targets are now U-factor 0.30 or lower and SHGC 0.23 or lower — noticeably stricter than the numbers most Southern California installers had memorized. If you are replacing less than 75 square feet of glazing total, the relaxed path is U-factor 0.40 and SHGC 0.35.

SHGC is the one that bites in Los Angeles. U-factor measures heat loss, which matters more in Minnesota than here; SHGC measures how much solar heat the glass lets through, which is exactly the LA problem. A 0.23 SHGC needs a real low-E coating, not a builder-grade unit.

The practical consequence: windows that miss the rating fail final inspection and get red-tagged, and a red tag on glazing is not a paperwork fix — the non-compliant units come back out. Leave the NFRC stickers on until the inspector signs off. This is the same compliance mechanism that drives Title 24 costs across a remodel.

Permits, and the Express path

Yes, you need one. No, it is usually not a big deal.

A like-for-like replacement in the City of LA — dual-pane for dual-pane, slider for slider, same opening — goes through PermitLA's Express Building Permit path. No drawings, no plan check, permit in one to three business days. Burbank, Glendale, and Pasadena all run their own building departments with their own over-the-counter equivalents.

You leave Express and enter plan check the moment you change an opening size, remove or add a header, or work on a designated historic property. Skipping the permit entirely is the expensive version: unpermitted glazing surfaces in escrow like any other unpermitted work, and buyers' agents now ask for the Title 24 documentation specifically.

The fire-zone version

If your address sits in a mapped Very High Fire Hazard Severity Zone — most of the hillsides from the Verdugos through the foothills — Chapter 7A applies, and it changes the window spec. Exterior glazing must be dual-pane with at least one tempered pane, or tested to SFM Standard 12-7A-2. The tempered pane resists the thermal shock of radiant heat; a single-pane window fails outright and lets flame straight into the house.

Tempered glass adds real money per unit, and Chapter 7A compliance overall runs 12–18% above a standard exterior scope once you add the fire-rated roof assembly and ember-resistant vents. Check your address on the CAL FIRE hazard map before you collect bids, because a quote written for a flatland house is simply the wrong quote for a hillside one — the same pattern we described in what a roof replacement really costs here.

When to bundle windows into a bigger project

Windows are one of the few items that get cheaper by joining a larger job. If the house is already headed into a whole-home renovation, full-frame replacement stops being a premium: the walls are open, the stucco patch happens inside a repaint you were doing anyway, and the flashing gets done right the first time instead of being patched around later. Replacing windows in isolation and then opening the same walls two years later is how homeowners pay for the same detail twice.

If windows are the whole project, get three bids, confirm each one names the specific U-factor and SHGC, and confirm each one carries the permit. Bids that leave both out are the ones that turn into change orders.

Questions

Do I need a permit to replace windows in Los Angeles?

Yes. Every window replacement in the City of LA needs a building permit, including a like-for-like retrofit. The good news is that swapping dual-pane for dual-pane in the same opening qualifies for the Express Permit path through PermitLA — no drawings, no plan check, and the permit typically issues in one to three business days. Changing an opening size, or any work in a hillside or fire zone, moves you out of Express and into normal plan check.

What is the difference between retrofit and full-frame windows?

A retrofit window slides a new unit inside the existing frame, which is why it takes 30–60 minutes per opening and needs no stucco repair. Full-frame removal takes the entire frame down to the rough opening, runs 2–4 hours per window, and requires patching stucco or siding afterward. Full-frame runs roughly 25–50% more. Choose retrofit when the existing frame is straight and dry; choose full-frame when there is rot, water damage, or you are changing the opening size. Retrofit also shrinks the visible glass by an inch or so on each side, which matters on small windows.

Do the 2026 Title 24 rules apply to my replacement windows?

If you are replacing more than 75 square feet of glazing, yes — you need U-factor of 0.30 or lower and SHGC of 0.23 or lower. Under 75 square feet the standard relaxes to U-factor 0.40 and SHGC 0.35. The numbers live on the NFRC sticker attached to every new window. Do not remove those stickers before the inspector sees them; that sticker is the compliance proof, and installing units that miss the ratings gets the job red-tagged and the windows pulled back out at your cost.

Are bedroom windows different?

Yes. Any window serving as the emergency escape from a sleeping room must give a net clear opening of at least 5.7 square feet, with at least 24 inches of clear height and 20 inches of clear width. This is the single most common way a retrofit fails inspection: the retrofit frame eats enough of the opening that a bedroom window that used to be legal no longer is. If a bedroom window is close to the minimum, measure before ordering — enlarging the opening later means a new header at $400–$1,000.