Double-Hung Windows for Homes in Fairfax, VA/Northern Virginia  

Upgrading your home with replacement double-hung windows enhances your home’s functionality and curb appeal. Homeowners in Fairfax, VA, and throughout Northern Virginia rely on KCSI Construction for double-hung window installations that provide durability, energy efficiency, and a timeless aesthetic. Whether you’re replacing outdated windows or improving your home’s insulation, our expert team delivers exceptional workmanship with top-tier materials.  

What Are Double-Hung Windows?  

Double-hung windows feature two sections that can move up and down. The top and bottom parts of the window can open, giving you more control over ventilation. You can also tilt both sections inward, making cleaning a breeze.   

Double-hung windows have a clean design that looks good in most homes. You can customize your windows with our selection of materials, colors, and patterns to match your home’s style.  

The Difference Between Single-Hung Windows & Double-Hung Windows  

Single-hung and double-hung windows are popular window installation choices offering unique features. In single-hung windows, only the bottom sash (the part that holds the glass) is operable and moves up and down, while the top sash remains fixed. This design is simpler and often more cost-effective.   

In contrast, double-hung windows allow both the top and bottom sashes to be operable, providing better ventilation options and easier cleaning, as both sashes can tilt inward. Double-hung windows are typically more versatile and offer more flexibility in airflow and maintenance but can be slightly more expensive due to their added functionality.  

High-Quality Windows From Leading Manufacturers  

We source our double-hung windows from trusted manufacturers, ensuring homeowners in Fairfax, VA, and Northern Virginia receive products built to last. We work with leading brands such as Marvin, Pella, Andersen, Ply Gem, ProVia, and Simonton, each known for their commitment to innovation. With these industry-leading manufacturers, our replacement double-hung windows offer superior insulation, weather resistance, and aesthetic appeal.  

Double-Hung Window Frame Options  

KCSI Construction offers vinyl, fiberglass, and wood-clad frames for double-hung windows. Each provides distinct benefits for homeowners in Fairfax, VA, and Northern Virginia.  

Vinyl Double-Hung Windows  

Made from PVC, vinyl windows are affordable and resist moisture, warping, and fading, making them ideal for Northern Virginia’s varying climate conditions. Their multi-chambered frames and insulated glass options enhance thermal efficiency, potentially helping to reduce heating and cooling costs throughout the year. Available in many colors and finishes, vinyl double-hung windows provide a sleek, modern appearance without regular painting or sealing.  

Fiberglass Double-Hung Windows  

For anyone seeking superior long-term performance, fiberglass double-hung windows offer exceptional strength and energy efficiency. Fiberglass frames are highly resistant to temperature fluctuations, ensuring they won’t expand, contract, or warp over time. This makes them excellent for Northern Virginia’s hot summers and cold winters, maintaining a tight seal for improved insulation. Fiberglass windows can also be designed to mimic the appearance of natural wood while offering better longevity and lower maintenance.  

Wood-Clad Double-Hung Windows  

Homeowners looking for a classic, high-end aesthetic will appreciate wood-clad double-hung windows, which combine the natural warmth of real wood with the durability of an exterior protective cladding. These windows feature a genuine wood interior that can be stained or painted to match your home, while the exterior cladding protects against the elements. This combination provides the timeless beauty of wood without the risk of rotting, warping, or frequent maintenance.  

Signs You Need Replacement Double-Hung Windows  

Recognizing when it’s time for replacement double-hung windows is essential. Some key indicators include:  

  • Increased energy bills – Older or poorly insulated windows let heat escape in the winter and let in excess warmth during the summer, forcing your HVAC system to work harder. If you’ve noticed a spike in your energy bills, inefficient windows could be the cause.  
  • Drafts and air leaks – Feeling a noticeable draft near your windows, even when they are closed, is a clear sign that the seals have deteriorated. Drafty windows lead to uneven indoor temperatures and can make certain rooms in your home uncomfortable.  
  • Difficulty operating windows – If your windows stick, jam, or won’t stay open without support, they may have balance issues, warping, or frame damage. Windows should open and close smoothly for ventilation and safety.  
  • Condensation between the glass panes – Fogging or condensation trapped between the panes of double- or triple-pane windows indicates a broken seal. When this happens, the insulating gas inside the glass has escaped, reducing energy efficiency and allowing moisture buildup.  
  • Visible damage or decay – Cracked glass, rotting wood frames, or deteriorating seals are clear signs that your windows need replacement. Over time, exposure to the elements can weaken window materials, leading to leaks, drafts, and structural issues.  
  • Outside noise seeping in – If your home is no longer a quiet retreat due to increased noise from traffic, neighbors, or outdoor activities, your windows may lack proper sound insulation. Modern double-hung windows with advanced glass technology can help reduce noise infiltration, creating a more peaceful indoor environment.  
  • Faded furniture or flooring – Excessive sunlight exposure through outdated windows can cause furniture, carpets, and hardwood floors to fade over time. New replacement double-hung windows with low-E glass help block harmful UV rays while still allowing natural light to brighten your home.  

Expert Double-Hung Window Installation  

Professional installation is key to maximizing the lifespan of your replacement double-hung windows. Our skilled team handles every project in-house—never relying on subcontractors—to ensure precision, quality, and long-lasting results. Whether we’re performing a pocket installation to preserve your existing window frames or a full-frame installation for a complete upgrade, we follow meticulous techniques to provide a secure, weather-tight fit.  

Begin Your Double-Hung Window Installation Project  

At KCSI Construction, we know that new windows are a big investment for your home. If you’re thinking about having custom double-hung windows installed at your home, don’t wait to get started. Book your free consultation today to see how double-hung windows can work for your home in Fairfax, VA/Northern Virginia.   

“KCSI recently replace a couple windows, a patio sliding door, and another exterior door. Their work was excellent, they were so respectful and clean, and we're very pleased with the overall experience! Mike (one of the owners) was so kind and easy to work with. He never tried to sell us anything, but simply explained what they could do and answered all the questions we had along the way.”

Brian B
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“Great work, but taking the time to write this review because of the exceptional level of communication from Mike and his team throughout the project and post the project when we've had questions about the windows or even other projects on our house. Mike's been available and a valued counsel as we navigate projects/budgets being first time home owners.”

Michael G

“KCSI recently replace a couple windows, a patio sliding door, and another exterior door. Their work was excellent, they were so respectful and clean, and we're very pleased with the overall experience! Mike (one of the owners) was so kind and easy to work with. He never tried to sell us anything, but simply explained what they could do and answered all the questions we had along the way.”

Brian B

“We hired KCSI to replace the roof, siding, windows and doors on our 50 year old house. They have just finished and we were very pleased with the final product and the entire process. Mike handled the job from the estimation to the installation. The job was completed in a week and a half and Mike made sure all of our concerns were addressed while the work was being done. We could not give KCSI a higher recommendation.”

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