Double Hung Windows

Double Hung Windows in Los Angeles, CA | Juniper Windows & Doors

Double hung windows give you two operable sashes that glide vertically, and both tilt inward so you can clean the exterior glass from inside your home. In Los Angeles, that matters more than most people realize: ocean air, wind-driven debris, and strict coastal building codes all test a window’s frame and glass far harder than a standard inland install ever would. Juniper Windows & Doors supplies and installs impact-rated double hung windows across Los Angeles, with laminated glass that holds together under impact and frames built to meet Florida Building Code High-Velocity Hurricane Zone requirements. Whether you’re replacing rotted originals in a 1920s Spanish Revival or updating a mid-century ranch near the coast, we match the window to your wind zone and your home’s architecture. Call (682) 281-2168 to talk through your project.

Call (682) 281-2168

Product Overview – Double Hung Windows

A double hung window is the traditional vertical-profile window: two sashes stacked one above the other, each sliding up and down on its own track. The upper sash drops down from the top of the frame, the lower sash lifts from the sill, and both tilt inward on pivot hinges. That tilt feature is what makes the profile so practical in Los Angeles homes: exterior glass can be wiped down without a ladder, and on a two-story home, that means no one has to work from the outside of an upper window at all.

For hurricane-prone construction, the double hung is one of the more demanding profiles to build correctly. A fixed window or a picture window only has to hold glass in place. A double hung has two moving sashes, interlocking meeting rails, balance systems, and tilt hardware, all of which must stay true under pressure. When you choose the impact series, the sashes are glazed with laminated impact glass: two panes bonded by a PVB (polyvinyl butyral) interlayer. If a branch or storm-driven debris strikes the glass, the outer pane may crack, but the interlayer holds the broken pieces in the frame. The window stays sealed against wind and rain until you decide to replace the glass. That is the entire point of an impact-rated system, and it is the standard Juniper Windows & Doors specifies for Los Angeles homes.

We supply double hung windows across our PGT, CGI, CWS, ES Windows, ECO, and Mr-Glass lines, in aluminum and vinyl frame profiles. Aluminum gives you a slimmer sightline and a more modern or commercial look, which suits many Los Angeles mid-century and contemporary builds. Vinyl delivers thermal performance and a lower-maintenance face that holds up well against salt air. Both are available with the same laminated glass packages and finish colors, so the choice comes down to architecture and budget.

Technical Specifications

The double hung impact series is configured per project. You are not buying a stock window off a shelf. Here is how the product breaks down:

• Frame materials: Aluminum or vinyl, selected for wind zone and exposure.
• Glass options: Laminated impact glass with PVB interlayer, Low-E insulated glass, tinted glass, clear glass.
• Finish options: White, almond, bronze, black, tan.
• Screen options: Half screen, full screen.
• Operation: Both sashes vertical-glide, both sashes tilt-in for cleaning.
• Design pressure: Matched to your wind zone, up to +/-100, never higher.
• Compliance: Miami-Dade NOA (Notice of Acceptance) and Florida Product Approval numbers available per configuration, engineered to FBC High-Velocity Hurricane Zone (HVHZ) requirements.
• Sill options: Standard sloped sill with positive drainage, sized to your rough opening.

Every dimension is taken from your actual rough opening during our site measure. We do not order from builder plans alone. If your existing frames are out of square, we find out before the window arrives, not on install day.

Hurricane & Compliance Performance

Laminated Impact Glass
The glass is the heart of the system. Two panes bonded with a PVB interlayer hold together under impact. If something hits the window hard enough to crack the outer pane, the interlayer keeps the glass in the frame and the building envelope sealed. That is the failure mode you want in a Los Angeles coastal storm.

Miami-Dade NOA / Florida Product Approval
Each double hung configuration carries a Miami-Dade Notice of Acceptance or Florida Product Approval number. These are issued per configuration, so the specific number depends on your frame material, glass package, and size. We list the applicable numbers on your quote, not on a generic web page, because a number that applies to one configuration does not apply to another.

FBC / HVHZ Compliance
The product is engineered to Florida Building Code High-Velocity Hurricane Zone requirements. HVHZ is the strictest windborne debris standard in the state, and it governs most of Los Angeles and the coastal corridor. If you are pulling a permit for window replacement in an HVHZ jurisdiction, your windows need evidence of this compliance.

TAS 201 / 202 / 203 Testing Context
HVHZ-rated products are tested under the TAS protocol family. TAS 201 is the large-missile impact test. TAS 202 is cyclic wind-pressure loading: the window is pressurized, released, and repressurized thousands of times to simulate a storm’s gust cycle. TAS 203 is forced-entry resistance. A product that passes all three is not just hurricane glass; it is a hardened barrier against break-ins too.

Design Pressure for Your Wind Zone
Design pressure is a PSF rating, not a wind speed. Our double hung windows are matched to your specific wind zone, up to +/-100 PSF. We never spec a higher rating than your location actually requires. Over-engineering costs you money without adding protection; the right DP rating for your exact lot is the correct answer.

Energy Performance
Laminated impact glass provides baseline protection. Adding Low-E insulated glass gives you a second layer of thermal control: lower heat gain through south and west-facing openings, better indoor comfort in Los Angeles afternoons, and reduced load on your AC system. Tinted glass is another option for glare-heavy exposures. We spec based on which direction each opening faces.

Color & Glass Options

Finish selection is where the window either disappears into the architecture or becomes a design element. White and almond stay quiet on stucco exteriors and work well on Spanish Colonial and Mediterranean homes, which make up a large share of Los Angeles housing stock. Bronze and black read more contemporary and pair naturally with modern builds, particularly when paired with black-framed mullions. Tan sits between the two camps: warm enough for traditional exteriors, dark enough to give a frame some presence.

On the glass side, clear laminated impact glass is the honest starting point: maximum visible light, full UV protection through the interlayer, and the impact performance you are paying for. Low-E insulated glass builds on that with a thermal barrier that matters on west-facing bedrooms and large south-facing living room openings. Tinted glass cuts glare and solar heat gain, at the cost of some visible light. The right call depends on the room, not the brochure. We walk you through it opening by opening when we measure.

Installation by Juniper Windows & Doors in Los Angeles

The best impact window on the market will leak and fail if it is installed wrong. That is not a scare line; it is the reality of HVHZ construction. A window carries a NOA because it passed testing as a complete system: frame, glass, fasteners, and installation method. Change the anchor schedule, skip the perimeter seal, or set the frame out of square, and you are not installing an approved product anymore. You are installing something that has never been tested, and your permit inspector may catch it, or your wall may catch it in the next storm.

Our installation process in Los Angeles starts with a pre-install inspection of the existing openings. We look at framing condition, water intrusion evidence, flashing, and existing sealant. Then we remove the old window, set the new one level, plumb, and square, and anchor it per the product’s approved installation details. The perimeter is sealed with AAMA 812 low-expansion foam, which insulates and air-seals without bowing the frame. Our practice follows AAMA 2400/2410 standards for installing windows in stucco, wood-frame, and masonry openings. After installation, we run a final water test, point and seal the exterior, and clean the site.

Los Angeles brings specific considerations. Coastal exposure means fasteners and frame coatings need to stand up to salt air. Wind zone mapping varies block by block in some areas, and the design pressure requirement changes with elevation and exposure category. Permitting also varies by jurisdiction, and HVHZ submittals require the correct NOA or Florida Product Approval documentation for each configuration. We handle that documentation as part of the job.

Frequently Asked Questions – Double Hung Windows

What wind zone or design pressure is the double hung window rated for?
The window is rated to match your specific wind zone, with design pressures up to +/-100 PSF, never higher. We determine the required rating from your precise lot location and exposure category during the quoting process.

What is the lead time on double hung impact windows?
Lead times vary by manufacturer and configuration, but typical waits run several weeks from order to delivery at our Los Angeles warehouse. We confirm current lead times when we quote, and we do not schedule your installation until the windows are physically in our hands.

Does my permit require a Miami-Dade NOA or Florida Product Approval submittal?
In most Los Angeles jurisdictions within the HVHZ, yes. Your permit application will need the NOA or Florida Product Approval number for the exact configuration you are buying. We provide that documentation with your quote so your permit moves without delay.

Can I customize the size or configuration of my double hung windows?
Yes. These are not stock sizes. Each unit is built to your measured rough opening, and you can mix glass types, finishes, and screen options across windows on the same home. The product approval documentation is generated for each configuration accordingly.

How do I maintain the frame and moving parts?
Clean the tracks seasonally with a dry brush or vacuum to keep debris out of the balance channels. Wash the exterior glass by tilting both sashes inward; no ladder needed. Vinyl frames need only soap and water; aluminum frames should be rinsed periodically if you are near salt air. Lubricate the tilt pivots and balance mechanisms lightly once a year.

Have a question we did not cover? Call (682) 281-2168 and we will answer it directly.

Get a Quote – Double Hung Windows in Los Angeles

If you are replacing windows in Los Angeles, the only way to get an accurate price is a site measure and a written line-item quote. We measure, spec the right design pressure for your lot, and price the exact window you need, no allowances and no change orders. Call (682) 281-2168 to schedule your free on-site measurement.

Written by the team at Juniper Windows & Doors, supplying and installing hurricane-impact windows in Los Angeles, CA.