When you’re building a new home or adding an extension, the windows you choose aren’t just about looks—they’re essential to the structure’s performance, comfort, and long-term value. That’s where construction windows come in.
This guide walks you through the basics of construction windows: what they are, how they’re different from replacement windows, the most popular styles and materials, and what to know before installing them. Whether you’re a homeowner, builder, or project manager, this is your go-to overview for making the right window choice during the construction phase.
What Is a Construction Window?
Construction windows—also called new construction windows—are specifically made for installation during the early stages of building a home or commercial space. They feature a nailing fin or mounting flange that allows the window to be securely fastened directly to the open wall framing, before any siding, brick, or drywall is added.
The U.S. Department of Energy notes that proper window framing and installation are critical for maximizing thermal performance and airtightness—making the construction phase a crucial time to get it right.
Why Use Construction Windows?
Installing windows at this stage has key benefits:
- Secure fit using the nailing fin, built right into the structure
- Superior insulation due to full access to seal and insulate the opening
- Custom sizing and features tailored to the home’s design
- No need to remove or work around finished walls
Most Common Types of Construction Windows
Here are the top styles you’ll find in new residential and commercial projects:
1. Single-Hung Windows
- Fixed top, sliding bottom sash
- Budget-friendly and traditional
2. Double-Hung Windows
- Both sashes slide up and down
- Easy to clean and great for ventilation
3. Casement Windows
- Side-hinged and opens with a crank
- Excellent for airflow and weather sealing
4. Sliding Windows
- Open horizontally along a track
- Great for tight or modern spaces
5. Fixed (Picture) Windows
- Do not open
- Best for adding natural light and framing views
Construction vs. Replacement Windows
| Feature | Construction Windows | Replacement Windows |
|---|---|---|
| When Installed | During framing (new build) | After construction (retrofit) |
| Attachment | Nailing fin/flange | Fitted into existing frame |
| Air Sealing Potential | Excellent | Good (depends on fit) |
| Wall Alterations | No (framed walls only) | Sometimes needed |
| Ideal For | New builds, additions | Renovations, window upgrades |
| Installed Cost | $250 – $850 | $300 – $1,000 |
Source: HomeAdvisor 2024 averages
Best Materials for Construction Windows
Choosing the right frame material is just as important as selecting the window style. Here’s how they compare:
| Material | Cost | Durability | Maintenance | Energy Efficiency | Best For |
|---|---|---|---|---|---|
| Vinyl | Low | High | Very Low | Good | Most residential builds |
| Aluminum | Moderate | Very High | Low | Fair | Commercial, modern homes |
| Wood | High | Moderate | High | Excellent | Luxury, historic homes |
| Fiberglass | High | Very High | Low | Excellent | High-end, energy-focused |
Look for NFRC-certified products to ensure you’re meeting energy codes and maximizing thermal performance.
When to Use Construction Windows
Choose construction windows when:
- You’re building a new home or property from the ground up
- You’re adding a new room, dormer, or full extension
- The framing is still open and accessible
- You want full control over window dimensions, shape, and specs
Frequently Asked Questions
How are construction windows different from replacement windows?
Construction windows are installed into open framing using a flange. Replacement windows are designed to fit into an existing opening without disturbing the walls or exterior finish.
Are construction windows more energy-efficient?
They can be. Since they’re installed before the walls are finished, you can fully seal and insulate the frame—resulting in better performance long term.
Do I need permits for construction window installation?
Yes, in most cases. Local codes often require specific energy ratings (like U-factor and SHGC), so it’s best to check with your local building authority.
Can I use construction windows in a remodel?
Only if you’re opening the wall and exposing the studs. Otherwise, replacement windows are usually a better choice.
How long do construction windows last?
With proper installation and good materials, expect 20 to 40 years of life, depending on your climate and upkeep.
Final Thoughts
Construction windows are designed to be integrated directly into the structure of your home or building project, offering airtight performance, custom design flexibility, and long-term energy savings.
Unlike replacement windows, they become a seamless part of the frame—ensuring durability and compliance from the start. Whether you’re overseeing a new home build or a commercial development, choosing the right window style, material, and installer will go a long way in creating a high-performing, beautiful finished product.
Want to make sure your windows meet today’s energy standards? Check out the ENERGY STAR Window Guide for certified options.