How Much Does Window Replacement Cost in Los Angeles?
Replacing windows in a Los Angeles house typically runs $600 to $3,500 per window installed, and a whole-house job of 10 to 15 windows usually lands between $8,000 and $30,000, depending on frame material and whether the installer can retrofit into the existing frame or has to cut into the stucco. Green Design and Build is a licensed general contractor (CSLB #1110975), bonded and insured, based in Van Nuys and serving the wider Los Angeles area — we handle window and door replacement as part of our design-build work, from a single failed window to a whole-house replacement.
Window replacement cost by type
| Scenario | What’s included | Typical Los Angeles range |
|---|---|---|
| Vinyl retrofit (replacement-insert) window | New vinyl window installed into the existing frame, no stucco disturbance | $600 – $1,500 per window |
| Fiberglass or composite retrofit window | Same retrofit method, higher-grade frame material | $1,200 – $2,500 per window |
| Aluminum-clad wood or full-frame (“new construction”) replacement | Old frame removed down to the rough opening, new frame installed, stucco cut and patched around it | $1,500 – $3,500 per window |
| Whole-house replacement, 10–15 windows | Mix of retrofit and/or full-frame depending on the house | $8,000 – $30,000 |
| Sliding patio door | Removal of old slider, new frame and glass, hardware | $2,000 – $6,000 |
These are typical Los Angeles budgeting estimates, not a price list or a quote. Your project can come in lower or higher depending on the house, the scope and the finishes; the only real number is a written proposal after a site visit.
What changes the price
- Retrofit vs. full-frame. Retrofit windows install inside the existing frame in a few hours with no stucco work — that’s why they sit at the low end. Full-frame removal costs more because it involves demo, a new nailing flange, flashing, and stucco or siding repair around the opening.
- Frame material. Vinyl is the cheapest frame that still performs well. Fiberglass and composite cost more but hold paint and shape better over decades and in direct sun. Aluminum-clad wood costs the most and is usually chosen for a specific look, not for budget.
- Glass package. Dual-pane with a Low-E coating is standard now; triple-pane and specialty coatings (tinted, obscure, impact-rated) add cost per window. Low-E coatings also affect whether the window meets state energy requirements, so cutting this corner isn’t usually an option.
- Size and shape. A standard 3×4 slider costs far less than an 8-foot picture window or an arched or trapezoid custom shape, which often has to be special-ordered.
- Stucco patching. Any full-frame job that changes the opening size, or where the old frame is rotted past the point of a clean retrofit, requires cutting and re-texturing stucco — and matching 40- or 60-year-old stucco texture and paint color is real labor, not an afterthought.
- Lead-safe practices. Houses built before 1978 often have lead paint on window trim. Disturbing that trim requires lead-safe work practices — containment, specific cleanup, and disposal — which adds labor time on older homes.
- Permit and inspection. Window replacement in most Los Angeles-area cities requires a permit, and the plan check and inspection scheduling adds both cost and time, especially on full-frame jobs.
Retrofit or full-frame — which does your house actually need?
If the existing wood or aluminum frame is structurally sound, square, and not rotted, a retrofit window is almost always the right call: it’s faster, cheaper, and doesn’t touch the stucco. Most 1950s–1980s Los Angeles houses with aluminum-frame single-pane windows are good retrofit candidates.
Full-frame replacement makes sense when the existing frame is rotted or rusted through, when you’re changing the size or shape of the opening, when you’re converting from a much thinner old frame to a deeper dual-pane unit and the reveal would look wrong with a retrofit insert, or when you’re already re-stuccoing the house as part of a larger exterior project. It costs more per window, but it’s the only way to actually replace a failed frame rather than build a new window inside a bad one.
Do you need a permit?
Generally, yes. Window replacement in Los Angeles and most surrounding cities requires a building permit, and the new windows generally must meet California’s energy performance requirements for U-factor and solar heat gain — which is why Low-E glass is now close to universal rather than optional. Bedroom windows also generally have to meet minimum size and opening requirements so they can serve as an emergency exit; if you’re downsizing a bedroom window’s opening during a full-frame job, that’s worth flagging before the order is placed, not after. Permit and inspection processes vary somewhat by city, but Los Angeles, Burbank, Glendale, Pasadena, and most surrounding jurisdictions all require sign-off on window replacement.
How long does it take?
Custom windows typically take 2 to 4 weeks to order and manufacture once measurements are finalized — this is usually the longest part of the timeline, not the install. Installation itself moves fast: a retrofit crew can typically install 8–12 windows in a day. Full-frame jobs run slower because of the demo and stucco patching — figure closer to 1–3 days for a whole house, plus additional time for stucco to cure and get painted to match. Permit approval timing varies by city and adds to the front end of the schedule.
How to compare quotes
A written proposal should break out, per window or as a clear total: frame material and brand, glass package (dual vs. triple pane, Low-E coating, gas fill), retrofit vs. full-frame method for each opening, whether stucco patching and paint-matching are included, permit cost and who pulls it, disposal of the old windows, and the manufacturer warranty plus the contractor’s labor warranty.
Red flags: a single lump-sum number with no frame material or glass spec named, no mention of a permit at all, a contractor who won’t say retrofit or full-frame in writing, or a deposit that seems designed to lock you in before you’ve seen the product spec sheet.
Where we do this work
We serve Los Angeles, Orange, and Ventura counties, plus western Riverside and western San Bernardino counties, out of our Van Nuys office. That covers Van Nuys, Sherman Oaks, Encino, Woodland Hills, Burbank, and Glendale in the San Fernando Valley area, as well as jobs further out across the Southland. See examples of our completed work in our project gallery.
Window replacement cost FAQs
Is it cheaper to replace one window or the whole house at once?
Per window, doing them all at once is usually cheaper than one-off replacements, because you’re spreading a single mobilization, permit, and crew setup across every opening instead of paying that overhead repeatedly. If budget forces a phased approach, prioritize the windows facing direct sun or showing visible frame damage first.
Do I need to replace all the windows to meet energy requirements?
No. California’s energy requirements apply to the windows you’re actually replacing, not the whole house. You can retrofit two or three failing windows now and do the rest later without triggering a whole-house requirement.
Why is a full-frame window so much more expensive than a retrofit?
Full-frame replacement means removing the old frame entirely, dealing with the rough opening, installing new flashing, and patching and re-texturing stucco to match decades-old material — that’s several extra trades and days of labor a retrofit never touches.
Can you match my existing stucco texture after a full-frame job?
In most cases, yes, though older stucco (particularly hand-troweled or heavily weathered finishes) is harder to match perfectly than a modern machine-applied texture. We assess this during the site visit and tell you honestly what to expect before you commit to full-frame.
Will new windows actually lower my energy bills?
Dual-pane Low-E windows measurably reduce heat gain and loss compared to older single-pane aluminum windows, which is most noticeable on west- and south-facing rooms in the San Fernando Valley heat. The dollar savings depend on your current windows’ condition and your usage, so treat comfort and noise reduction as the more certain benefits.
How do I know if my house needs a permit for just a few windows?
Almost every Los Angeles-area city requires a permit for window replacement regardless of quantity, because the work touches structural openings and energy code compliance. Any contractor proposing to skip the permit on “just a couple of windows” is taking on liability that should concern you too.
Get a written window replacement price for your house
Every house is a different mix of frame condition, sizes, and stucco work, which is why we don’t quote windows over the phone. We’ll walk your house, measure every opening, tell you retrofit vs. full-frame for each one, and send a written proposal within 48 hours. Call (800) 348-3050 to schedule a free site visit, or reach out through our windows and doors page.