Carlsbad Quality Windows is coastal North County's trusted specialist in double-pane window replacement, specializing in single-pane aluminum slider swaps, dual-pane retrofit inserts, and argon-filled Low-E glass packages. We offer vinyl double-hungs and fiberglass sliders built around a sealed insulated glass unit.
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Our team provides an NFRC label review with every quote, delivering quieter, cooler rooms for homes and Title 24 paperwork for both residential and commercial projects. Backed by 13 years in business and our 2-year workmanship warranty, we've completed over 1,730 projects, from a single bedroom slider to every opening on a 30-window two-story home.
From the warm-edge spacer that holds the two panes apart to the city inspector's NFRC sticker check, our team handles every detail. Serving Carlsbad and neighboring Solana Beach, Del Mar and Lake San Marcos, we leave every room with two panes of glass, a gas fill and a seal you can read on the label.
Why Carlsbad Quality Windows
Linda, La Costa, Carlsbad
1980s La Costa ranch with original single-pane aluminum sliders and hot west bedrooms
Investment and duration figures are estimates. Your written quote sets the final price and schedule.
Linda's 1980s La Costa ranch still had its original single-pane aluminum sliders and hot west bedrooms, so we replaced all 13 openings with dual-pane units in one visit. We recommended retrofit inserts on all 13 openings with Low-E 366 glass on the west wall, one permit and one Title 24 inspection, an estimated $9,600 to $11,800 investment in white vinyl, dual-pane Low-E with argon.
The crew finished in an estimated 1 to 2 days on the 13 windows, single-story stucco ranch, with the stucco left untouched. Linda's west bedrooms no longer cook by mid-afternoon.
Click or drag the window to open it.A picture window is fixed glass and does not open.
Window style
Frame material
Investment and duration figures are estimates. Your written quote sets the final price and schedule.
Pick a window style and a frame material to see the typical price per dual-pane window, the frame's expected lifespan and its usual warranty. Owners swapping single-pane sliders in Calavera Hills and Old Poway usually start with vinyl, while bluff homes in Solana Beach lean toward fiberglass.
Insert into the sound old frame, stucco left untouched
The common 1970s and 1980s aluminum slider swap
Every window in one visit, one permit, one inspection
Staged from the ground and ladders, upstairs first
Investment and duration figures are estimates. Your written quote sets the final price and schedule.
A dual-pane window is two sheets of glass sealed around a spacer bar, with the gap between them filled with argon gas and one inner surface carrying a Low-E coating. The sealed gap is what slows heat through the glass, and the coating reflects the sun's heat back outside while letting daylight through.
The spacer is the part most people never see. A warm-edge spacer holds the panes a fixed distance apart, carries a desiccant that soaks up any moisture trapped at the factory, and holds the seal that keeps the argon in. When that seal fails, the unit fogs between the panes, which is why a failed dual-pane in Eden Gardens or New Encinitas is replaced, not cleaned.
Low-E 366 is a triple-silver coating we put on west and ocean-facing walls in Aviara and Leucadia, where the afternoon sun off the water heats a room fastest.
Every new window carries an NFRC label, and the two numbers that matter here are the U-factor and the solar heat gain coefficient. A lower U-factor means less heat moves through the whole window, and a lower SHGC means less of the sun's heat comes in through the glass.
California's Title 24 energy code sets the ceiling: replacement windows in our climate zones need a U-factor of 0.30 or lower and an SHGC of 0.23 or lower on the south and west walls. Single-pane aluminum windows from the 1970s and 1980s miss both by a wide margin, so a permitted swap in Del Mar or Rancho Santa Fe always lands on dual-pane glass.
The inspector checks those numbers against the sticker, so the NFRC label stays on the glass until the city signs off. Never peel it off on install day.
The frame can stay when it is square, the sill is solid and water has not reached the wood or framing behind it, and in that case a retrofit insert slides a new dual-pane unit inside the old frame. Most 1970s tract homes in Poway and the 1980s ranches of La Costa qualify, which keeps the stucco and the interior trim untouched.
The frame must go when the sill has rotted, the aluminum has pitted through near the coast in Cardiff-by-the-Sea, or the opening leaks at the corners. Then we do a full-frame tear-out to the studs with new flashing and a sill pan, which our retrofit vs full-frame guide compares opening by opening.
Double-pane window replacement in Carlsbad is typically estimated at $450 to $950 per window for a retrofit vinyl double-hung and $750 to $1,400 per window for a vinyl or fiberglass slider. The frame material, the glass package and whether the old frame stays or needs a tear-out move the price most.
Whole homes price better per opening: most single-story homes are estimated at $8,500 to $12,000, and Linda's 13-window La Costa ranch came in at an estimated $9,600 to $11,800 with Low-E 366 on the west wall.
| Replacement | Est. price | Est. time on site | Frame |
|---|---|---|---|
| Retrofit vinyl double-hung | Est. $450 to $950 per window | Est. 45 to 90 minutes | Old frame stays |
| Vinyl or fiberglass slider | Est. $750 to $1,400 per window | Est. 1 to 2 hours | Old frame stays |
| Full-frame tear-out | Est. $800 to $1,500 per window | Est. 3 to 6 hours | New frame to the studs |
All of these dual-pane prices are estimates and may change once we see each frame and sill, and the written quote after the measure sets the final price and the install schedule.
A single-pane to dual-pane swap needs a building permit and a Title 24 inspection in Carlsbad, Encinitas and every city we serve, and we pull it for you. The most common DIY mistake is buying a big-box unit whose label misses the SHGC limit for a west wall, which fails the inspection and has to come out again.
The second mistake is setting a new unit over a soft sill. Water that already reached the wood keeps rotting it behind a brand-new window, and the leak returns within a winter or two. Any glass near a door, tub or low sill must also be tempered under CBC R308.
White vinyl gives the most dual-pane window for the money on inland homes in Harmony Grove and Bonsall, while fiberglass frames, covered on our fiberglass windows page, hold up better within a few miles of the ocean.
The crew lead who measures your openings is the one who installs them, and every window carries our 2-year workmanship warranty on every installation. Manufacturer warranties passed through to you, commonly 20 years on the glass and 10 years on non-glass parts, cover the seal itself, and you can meet the team before your measure.
We replace single-pane glass across a 30-mile radius of Carlsbad, from Bressi Ranch to Solana Beach bluff homes, Old Del Mar cottages and lakeside homes in Lake San Marcos. Encinitas, Poway, Fairbanks Ranch and Elfin Forest are on the full service area list.
Dual-pane glass is one part of a full energy-efficient window package, and when every opening in the house is single-pane, our whole-house replacement projects page plans them as one job. For street-facing or ground-floor openings, laminated impact glass adds break-in resistance to the same sealed unit.
Most retrofit double-hungs are estimated at $450 to $950 per window and most sliders at $750 to $1,400, and your written quote sets the final price after the measure.
Rarely, because old single-pane aluminum frames are too thin to hold a sealed unit, so we replace the window as a retrofit insert instead.
Most retrofit windows take an estimated 45 to 90 minutes each, and a single-story home of 10 to 15 windows typically takes 1 to 2 days.
The seal around the spacer has failed and the argon has leaked out, so the unit needs replacing on homes from Olivenhain to Del Mar Heights alike.
Yes, argon fill is standard in every dual-pane unit we install, because it slows heat through the gap better than air at almost no added cost.
Yes, a permit and a Title 24 inspection are required for replacement windows in Carlsbad, and our crew pulls it and meets the inspector.
Double-pane with Low-E and argon is the right choice for our mild coastal climate, and triple-pane mostly pays off in cold northern climates.
Call us today to book a measure, and we will check every frame and sill and send a written, itemized quote for your dual-pane windows.
The process
We check every frame, sill and the stucco around it, then laser-measure each opening for the unit that goes in it.
Frame material, glass package, label values and install method arrive in writing before anything is ordered.
Each window is set on a sloped sill pan, flashed and sealed, with the NFRC sticker left on for the inspector.
We open and lock every window and door with you, and the city signs off the Title 24 permit.
Services
Where we work
Homeowners get a free measure at the house. Boards, managers and contractors can send plans or an opening count for a bid.
Calls only, we do not receive text messages.
