What is a New Construction Window?

what is a new construction window? An example of a new construction window with white frame specifically designed for a newly built home

A new construction window is specifically designed for installation in newly built homes or additions. Unlike replacement (retrofit) windows, which fit into existing frames, these windows include a nailing fin for securing directly to the house frame. This method ensures seamless integration, superior insulation, and enhanced energy efficiency, ideal for creating airtight and weatherproof building envelopes.

Selecting the right windows is crucial for building a new home or adding an extension.

Homeowners often find various window options overwhelming, particularly when understanding the differences between new construction and replacement windows.

This article explores a common question we hear from homeowners: what is a new construction window?

What is a New Construction Window?

New construction windows are crafted for buildings under construction or significant additions to existing structures.

These windows feature a nailing fin or flange, a thin strip extending from the window frame, allowing the window to be nailed directly into the house’s framing. This method creates a more secure and stable installation compared to retrofit windows installed within an existing frame. New construction windows are integral to the structure of the building, contributing to its overall stability and energy efficiency.

The design and installation of these windows aim to provide optimal insulation and prevent air and water infiltration, making them an excellent choice for new builds and major renovations.

Features of New Construction Windows

New construction windows come with several distinctive features. The most notable is the nailing fin, which provides a secure attachment to the building’s frame.

This fin ensures that the window is firmly fixed, reducing the risk of gaps that can lead to air leaks. Additionally, these windows are typically made with advanced materials that offer enhanced durability and energy efficiency. They are designed to integrate seamlessly with the building’s structure, providing a cohesive look and superior performance.

Customization options are often available, allowing homeowners to choose styles and finishes that match their aesthetic preferences.

Benefits of New Construction Windows

New construction windows offer a multitude of advantages, making them a top choice for homeowners and builders alike. Their design and installation process provide numerous functional and aesthetic benefits:

  • Superior Insulation: Due to their secure installation directly into the building’s frame, new construction windows provide excellent insulation, leading to significant energy savings. This reduces heating and cooling costs, making your home more energy-efficient.
  • Enhanced Aesthetic Appeal: These windows can be customized to match the architectural style of your home, enhancing its overall appearance. Available in various styles and finishes, they allow for a personalized touch.
  • Better Protection Against the Elements: New construction windows are designed to integrate seamlessly with the building, preventing air and water leaks. This offers better protection against weather-related damage and improves indoor comfort.
  • Increased Structural Integrity: By becoming an integral part of the building’s structure, new construction windows contribute to the overall stability and durability of your home.
  • Long-Term Value: Investing in new construction windows can increase the value of your property. Their energy efficiency, durability, and enhanced aesthetics make them a desirable feature for potential buyers.

These benefits underscore why new construction windows are a valuable addition to any new build or major renovation project.

Comparison with Retrofit Windows

When comparing new construction windows with retrofit windows, several key differences emerge.

Retrofit windows are designed to fit into existing window openings, making them ideal for renovations where the existing frames are in good condition.

They are generally easier and quicker to install but may not offer the same level of insulation as new construction windows.

On the other hand, new construction windows are installed directly into the framing of the building, providing a more secure and energy-efficient solution.

While the installation process is more involved, the long-term benefits of energy savings and structural integrity make them a preferred choice for new builds.

Related: What is a Replacement Window?

Trusted Brands for New Construction Window Projects

When selecting windows for new construction projects, choosing the right brand is crucial for ensuring quality, durability, and energy efficiency.

Here are some of the top brands known for their excellence in new construction windows:


Renowned for its innovative designs and high-quality materials, Milgard offers a wide range of new construction windows that provide exceptional energy efficiency and durability. Their customizable products allow homeowners to choose the perfect style and finish to match their home’s aesthetic.


Simonton windows are celebrated for their affordability without compromising on quality. They offer a variety of styles and finishes, all designed to enhance energy efficiency and provide superior performance. Simonton windows are a popular choice for those seeking reliable and cost-effective options for new construction projects.


Known for their craftsmanship and advanced technology, Jeld-Wen windows offer excellent thermal performance and durability. Their extensive range of styles and materials ensures that there is a suitable option for every new construction project, providing both functionality and aesthetic appeal.

Ply Gem

Ply Gem windows are highly regarded for their energy-efficient designs and sturdy construction. They offer a wide selection of window styles, from classic to contemporary, ensuring that homeowners can find the perfect fit for their new build. Ply Gem windows are designed to withstand various weather conditions, providing long-lasting performance.

We carry these window brands (and more) because they’re trusted by builders and homeowners alike for their commitment to quality and innovation in window manufacturing, making them top choices for new construction projects.

Installation Process of New Construction Windows

The installation process of new construction windows involves carefully executed steps to ensure a secure and energy-efficient fit. Here’s a detailed look at each stage:

1. Preparing the Rough Opening: The first step is to prepare the rough opening in the building’s frame. This involves measuring to ensure the opening is the correct size and removing any debris or obstructions. Proper preparation is crucial to ensure the window fits correctly and operates smoothly.

2. Placing the Window: Once the opening is ready, the new construction window is placed into it. The window is positioned carefully to ensure it is level and plumb. This is essential for the window’s functionality and to prevent future issues such as sticking or leaking.

3. Securing the Window with the Nailing Fin: The window is secured to the building’s frame using the nailing fin, which extends from the window frame. Nails or screws are driven through the fin into the framing, creating a tight, stable fit. This step is critical for preventing air and water infiltration.

4. Applying Flashing Tape: After securing the window, flashing tape is applied around the edges of the nailing fin. This tape acts as a barrier to water, directing it away from the window and preventing leaks. Proper application of flashing tape is vital for long-term weather resistance.

5. Insulating the Gaps: Insulation is added around the window to fill gaps between the window frame and the rough opening. This step enhances the window’s thermal performance, reducing heat loss and improving energy efficiency.

6. Installing Exterior Siding or Trim: The final step involves installing exterior siding or trim around the window. This completes the exterior appearance and adds layer of protection against the elements. The trim helps to seal the window and integrate it seamlessly with the rest of the building.

7. Post-Installation Inspection: A thorough inspection ensures the window is properly installed. This includes checking for any gaps, ensuring the window operates correctly, and confirming that all seals are intact. Any issues identified during this inspection are addressed immediately to guarantee a high-quality installation.

Types of New Construction Windows

There are several types of new construction windows to choose from, each offering unique advantages.

Vinyl windows are popular for their durability, low maintenance, and energy efficiency. Wood windows provide a classic aesthetic and excellent insulation but require more upkeep.

Aluminum windows are strong and lightweight, making them ideal for larger openings, though they may not insulate as well as other materials.

New construction windows come in various styles, including double-hung, casement, and sliding windows, allowing homeowners to select the best option for their needs and design preferences.

Choosing the Right New Construction Window

Choosing the right new construction window involves considering several factors. The climate in your area will influence the type of material that will perform best.

For example, vinyl or fiberglass windows are ideal for regions with extreme temperatures. Your home’s design is also important; the windows should complement the overall aesthetic. Additionally, budget considerations will play a role in your decision.

Consulting with professionals can help you navigate these choices and select the best windows for your project, ensuring a balance of functionality, durability, and style.

Get A Free New Construction Window Consultation

Are you considering new construction windows for your home? Schedule a free consultation with Legendary Doors & Windows today!

Our experts at Legendary Doors & Windows are here to help you find the perfect windows for your project, ensuring top-quality installation and long-term satisfaction.

Contact us today to get started and enhance your home with our premium new construction windows.


Understanding what is a new construction window is crucial for anyone involved in building a new home or undertaking a major renovation.

New construction windows offer superior insulation, durability, and aesthetic appeal, making them an excellent investment.

Exploring new construction windows is a wise choice for homeowners seeking high-quality solutions.

Schedule a free consultation with Legendary Doors & Windows today!