LW Series Vinyl Replacement Windows
The LW Series replacement windows by Lake Washington Windows and Doors are designed for Seattle’s wet winters and rainy season. It’s a perfect balance of energy performance, durability, and appearance.
Why The LW Series is Our Only Vinyl Replacement Window for Your Seattle Home
At Lake Washington Windows & Doors, we’ve spent the last 17 years carefully selecting the best window and door solutions for Northwest homes. That commitment to quality led us to introduce our most innovative product line yet: the LW Series replacement windows—available exclusively through Lake Washington Windows and Doors. Homeowners in Washington won’t find these premium vinyl windows anywhere else.
Built to perform in the Pacific Northwest by one of the highest-rated window manufacturers in the country, LW Series premium vinyl windows are engineered for superior energy efficiency, durability, and noise reduction. Backed by thousands of satisfied customers and a true limited double lifetime warranty, this collection reflects our dedication to offering lasting value and trusted performance.
Our founder, Adrian Au, spent nearly two decades mastering the window industry with one of the nation’s leading manufacturers. The decision was evident when he discovered a product line matching our high craftsmanship, energy savings, and customer care standards. The LW Series was born from that alignment of values—bringing together elite manufacturing with expert local installation.
Every LW Series window installation includes our exclusive, patented Leak Armor Guarantee, offering added protection against water intrusion—an essential safeguard in Washington’s rainy climate.
Experience the LW Series difference: expertly crafted, professionally installed, and designed to stand the test of time.
Experience Unmatched Protection With Our True Double Lifetime Warranty
LW Series Replacement Windows has an industry-leading True Double Lifetime Warranty, offering exceptional coverage to protect your investment.
This comprehensive warranty protects all window components against defects in materials and workmanship, covers labor costs for repairs or replacements, and provides replacement for accidental glass breakage for as long as you own your home.
Additionally, the warranty is fully transferable to the next homeowner, enhancing its value and reassuring potential buyers. Should warranty service become necessary, assistance is readily available to ensure prompt and professional care.
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LW Del Mar Premium Vinyl Windows
The LW Series Premium Vinyl Windows delivers unparalleled quality, combining superior energy efficiency, enhanced security, and elegant design. These windows are engineered with advanced technology and precision craftsmanship, significantly upgrading your home’s comfort, appearance, and overall value.
Key Features and Benefits
- Energy efficiency: Featuring Comfort•Core™ foam insulation, Inner•Core™ thermal reinforcements, and triple-fin weatherstripping, these windows exceed Energy Star® standards in every category. You’ll enjoy consistently comfortable temperatures indoors, reduced energy bills, and a more environmentally friendly home.
- Noise reduction: Innovative sound suppression technology built into every LW Premium Vinyl window dramatically reduces outside noise, creating a relaxing indoor atmosphere free from traffic sounds, neighborhood disturbances, and urban noise.
- Enhanced security: Designed with reinforced interlocking frames, advanced locking mechanisms, and optional laminated security glass, the LW Series will give you complete peace of mind by significantly strengthening your home’s protection against forced entry.
- Expansive views & elegant aesthetics: Slim-profile frames maximize natural light and provide unobstructed, panoramic views of the outdoors. Their contemporary appearance complements traditional and modern architectural styles, dramatically boosting your home’s curb appeal.
| Glass Packages | Quality | Window Types | Design | Security | Energy Efficiency | Noise Reduction | Warranty |
| SunMatrix | Weather-Tight Seal | Single Slider | Even Sightlines | First Guard | Comfort•Core™ | Sound Package | Limited Double Lifetime |
| Infinit-e | Smooth Operation | Single Hung | Maximum View | Sash Dead Bolt | Inner•Core™ | ||
| SunShield | Heavy-Duty Screen | Picture | Ventilation Latch | Continuous Interlock | |||
| CoolShield | XTRU | Geometric | |||||
| Luminance | Armor | ||||||
| QuadraTherm |
LW Del Mar Expanded Premium Vinyl Windows
The LW Del Mar Expanded series is designed for homeowners who want more natural light, larger viewing areas, and a clean, minimalist aesthetic. Built on the same platform as the standard Del Mar line, this series maintains exceptional energy efficiency, noise reduction, and security while offering a slimmer frame profile for expanded glass space. The LW Del Mar Expanded View series is ideal for open-concept interiors, modern architecture, or any home where maximizing daylight and outdoor connection is a priority.
Key Features and Benefits
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Slim-Profile Frame: Narrower frame dimensions allow for more glass and less visual obstruction, giving your home brighter, airier rooms and better views of the outdoors.
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Built on Del Mar Performance: Delivers the same Comfort•Core™ insulation, Inner•Core™ reinforcement, triple-fin weatherstripping, and sound-dampening glass as the standard Del Mar series.
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Modern Architectural Appeal: The reduced-profile frame lines pair perfectly with transitional and modern design styles, offering a more refined, updated look.
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Flexible Design Options: Available in various window types and configurations, including single-hung, slider, picture, and custom shapes, to fit any room or design goal.
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Energy-Efficient & Secure: Maintains the same Energy Star® performance ratings and optional multi-point locking systems to keep your home comfortable and protected year-round.
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Glass Packages |
Quality |
Window Types |
Security |
Design |
Energy Efficiency |
Noise Reduction |
Warranty |
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SunMatrix |
Weather-Tight Seal |
First Guard |
Even Sightlines |
Comfort•Core™ |
Sound Package |
Limited Double Lifetime |
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Infinit-e |
Smooth Operation |
Sash Dead Bolt |
Maximum View |
Inner•Core™ |
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SunShield |
Heavy-Duty Screen |
Continuous Interlock |
Ventilation Latch |
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CoolShield |
XTRU |
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Luminance |
Armor |
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QuadraTherm |
LW Coronado Series Vinyl Windows
The LW Coronado Series Vinyl Windows perfectly complements our premium vinyl window selection, providing additional styles and functionality to supplement and expand your window options. These windows offer dependable energy efficiency, easy maintenance, and reliable protection against harsh weather.
Key Features and Benefits
- Enhanced energy efficiency: Equipped with advanced glazing systems and multi-chambered frames, these windows exceed Energy Star® requirements, helping to reduce heating and cooling costs year-round.
- Superior noise reduction: Optional sound suppression technology significantly diminishes external noise, creating a quieter and more comfortable indoor environment.
- Durable construction: Crafted from high-quality vinyl, LW Series Vinyl Windows are designed to withstand the test of time, resisting warping, cracking, and fading even in challenging weather conditions.
- User-friendly maintenance: Features like tilt-in sashes and easy clean glass facilitate easy cleaning from inside your home, while the low-maintenance vinyl frames require minimal upkeep.
- Enhanced security: Reinforced frames and robust locking mechanisms provide increased protection against forced entry, ensuring the safety and security of your home.
| Window Types | Glass Packages | Quality | Design | Security | Energy Efficiency | Noise Reduction | Warranty |
| Double Slider | SunMatrix |
XTRU
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Even Sightlines | First Guard | Energy Star Certified | Sound Package | Limited Double Lifetime |
| Double Hung | Infinit-e | Smooth Operation | Tilt-In Feature | Sash Dead Bolt | |||
| Casement | SunShield | Easy Clean Glass | Ventilation Latch | Continuous Interlock | |||
| Awning | CoolShield | Armor | |||||
| Bay & Bow | Luminance | ||||||
| Garden | QuadraTherm |
Replacement Window Features Engineered for Northwest Homes
LW Series windows are engineered with premium materials and high-performance technologies designed specifically for homes in the Pacific Northwest. From smooth operation and reinforced security to industry-leading energy efficiency, every detail is built to perform.
| Feature | Description | Benefits |
| LW XTRU Architectural Frame with Foam Insulation |
A state-of-the-art vinyl extrusion system combined with Comfort•Core™ green foam insulation increases energy efficiency by reducing thermal transfer in key air chambers. Exclusive to LW Del Mar and LW Del Mar Expanded |
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| High-Quality Smooth Operation | Precision components deliver consistent, effortless operation across all sliding and hung windows. |
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| Weather-Tight Seal | Antimicrobial triple-fin weatherstripping with four filler barriers ensures superior defense against the elements. |
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| Heavy-Duty Screen Frame with Antimicrobial Mesh & Watershed Coating |
Screens are built with high-test aluminum, antimicrobial mesh, and watershed coating for better airflow, visibility, and cleanliness. Standard in LW Del Mar / LW Del Mar Expanded; optional upgrade in LW Coronado |
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| LW Sound Package |
Varying glass thicknesses and argon gas reduce sound transmission by up to 50%. Standard in LW Del Mar / LW Del Mar Expanded; optional upgrade in other series |
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| Security and Fiberglass Reinforcement | Fiberglass-reinforced lock rails and continuous interlocking frames provide durable, secure resistance against intrusion. |
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| Climate-Specific Glass Packages | Glass options are tailored for different regional needs, improving performance and comfort no matter where you live. |
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| LW Armor™ Protective Film | A peel-away film protects both sides of the glass through every phase of the process—ensuring windows arrive flawless. |
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Get Exclusive Access to LW Series Replacement Windows Today
Ready to upgrade your home with premium, energy-efficient vinyl windows? The LW Series Replacement Windows offers unmatched performance, lasting durability, and exclusive features you won’t find anywhere else in Washington.
Schedule your free in-home consultation with Lake Washington Windows and Doors today. Our team will walk you through your options, help you choose the right window styles for your home, and ensure a seamless, professional experience from start to finish.
FAQs — LW Series Vinyl Replacement Windows
What companies carry the LW Series Vinyl Replacement windows?
LW Series windows are available only through Lake Washington Windows and Doors. Homeowners in Washington won’t find these premium vinyl windows anywhere else. They’re not sold in stores..
Is professional installation included?
Yes. Our experienced team of professionals follows a precise replacement process with all LW Series windows, ensuring precision fit, long-term performance, and eligibility for warranty coverage.
Do LW Series windows meet Washington State energy code requirements?
Yes. LW Series Premium and Vinyl windows meet and exceed Washington State’s strict energy code requirements for residential window installations.
How long does the process take from order to installation?
Lead times vary depending on the season and demand, but most orders are installed within 6–10 weeks from purchase.
Is financing available for LW Series window projects?
Yes. We offer financing options through approved partners, allowing qualified homeowners to break project costs into manageable monthly payments.
Do you offer LW Series windows to contractors or builders?
Yes. We partner with licensed contractors, builders, and remodelers across Washington through our dedicated contractor sales program. LW Series windows are available exclusively through Lake Washington Windows and Doors, and we provide direct access to product ordering, support, and job site delivery. If you’re a contractor looking for premium vinyl windows backed by responsive service and competitive pricing, visit our Contractor Portal to learn more.
How do LW Series vinyl windows compare to fiberglass windows?
LW Series vinyl windows offer excellent energy efficiency, sound control, and long-term durability at a more affordable price point. Fiberglass windows may be better suited for homeowners prioritizing energy efficiency, structural strength, and a paintable finish.
Are LW Series doors available to match my windows?
Yes. Our LW Series patio doors are designed to complement LW Series windows in style and performance. These premium sliding and swinging doors offer the same energy efficiency, security features, and durable construction — perfect for creating a cohesive look throughout your home.
COMMERCIAL-GRADE Installation
Leak Armor Lifetime Installation Guarantee
When it comes to preserving the lifespan of your new windows and doors, installation matters. Thousands of window and door installations have honed our replacement process to perfection. For each project, our team follows a streamlined 3-step process to ensure you experience minimal delays and inconvenience before enjoying the benefits of your new window or door.
Top-Rated Window & Door Replacement Services
At Lake Washington Windows and Doors, we offer the highest quality windows and unparalleled customer service, with over 800 5-star reviews. With each installation, our exclusive Leak Armor Installation provides superior protection around your window openings. When you choose us for your window installation project, you can be sure that you’re getting the best.
Financing Options with Convenient 10 Minute Approvals
In addition to special offers and promotions, ask our sales representative about our quick, digital financing application process. From low-interest traditional loans to no down-no payment-no interest deferred financing plans, we can help you fund your replacement window project so you can mobilize your cash for other investments. We are a proud partner of GreenSky, one of the largest lenders for the home improvement industry. See how much you can be pre-approved for.
Every Window & Door Includes a Limited Lifetime Warranty
The beauty of working with the top window manufacturers in the industry is the support you can expect before, during, and after installation. Milfard offers a limited lifetime warranty. However, the likelihood that you’ll need to take advantage of the warranties is low.
Milgard Lifetime Warranty Guarantee
Milgard’s award-winning windows and doors are built to last. However, if you ever encounter an unexpected problem, you can rest assured that their lifetime warranties cover your purchase.
Every Installation Includes Leak Armor Commercial-Grade Protection
Our exclusive Leak Armor protection is included with every window we install. Developed through thousands of customer installations and years of experience, we utilize multiple layers of flashing, pans, and sealants in a specific manner to provide commercial-grade sealing to residential homes.