Main Types of Window Installation

When it comes to replacing or installing new windows, how they are installed matters just as much as the window type itself. Understanding your options helps you choose the best fit for your home, budget, and long-term goals.

There are two main types of window installation: full-frame installation and retrofit installation. Each method has its own process, benefits, and ideal use cases. Let’s explore both in detail.

Full-Frame Installation (Also Known as New Construction)

Full-frame installation involves removing everything: the old window, the frame, the casing, and even the trim. The process takes the structure down to the wall studs before a new window is installed.

This method gives the installer complete access to the window opening. That makes it easier to spot damage, install proper insulation, and ensure a perfect fit. It is often the go-to choice for major remodels or when the existing frame is no longer in good shape.

This method is ideal in the following situations:

• You're doing a complete home renovation.
• The existing window frame is rotted, warped, or damaged.
• You want to change the window size or shape.
• You are building a new home from the ground up.

If your window project is more than a simple upgrade, full-frame installation is likely the better option.

The contractor will:

1. Remove the entire existing window unit, including trim and casing.
2. Inspect the wall cavity for damage or rot.
3. Install new insulation, flashing, and waterproofing as needed.
4. Fit the new window into the cleaned, prepped opening.
5. Finish with new exterior and interior trim.

Full-frame installations are detailed and labor-intensive, but they offer the highest level of quality and customization.

Retrofit Installation (Also Known as Pocket or Insert Installation)

Retrofit installation, also known as insert installation, is a faster and less invasive option. It involves placing a new window into the existing frame without removing the surrounding trim or structure.

This method is only possible if the current window frame is still in good condition. Installers remove the old window sashes but leave the frame in place. Then, they insert a new window into the opening and seal it.

It’s a popular choice for homeowners looking to update their windows without a full renovation.

Retrofit is best in the following situations:

• Your window frames are structurally sound.
• You are replacing multiple windows and want to keep costs lower.
• You want a quick installation with minimal mess.
• You like the existing style and don’t want to change it.

If you’re looking for a fast upgrade, retrofit installation is often the way to go.

Here’s what a typical retrofit installation includes:

1. Removal of window sashes or sliding parts.
2. Inspection of the existing frame to ensure it’s solid.
3. Custom sizing of the new window to fit inside the old frame.
4. Insertion and securing of the new window.
5. Sealing, insulation, and trim touch-ups.

This process is quicker and more affordable, but it requires a solid starting point. If your frames are warped or damaged, full-frame installation might still be necessary. Both installation types offer unique benefits. If you’re investing in a full remodel or your window frames are in poor shape, full-frame installation is likely the smarter, longer-term solution. On the other hand, if your frames are solid and you want a quicker, less costly upgrade, retrofit

Types Within Retrofit and Full-Frame Installation

Now that you understand the main window installation methods, let’s take a closer look at the subtypes. These specific techniques help installers match different home materials, styles, and structural conditions. Choosing the right subtype ensures a proper fit and lasting performance.

Both retrofit and full-frame installation types include distinct methods. Each one is suited for a particular kind of home exterior, frame condition, or project goal.

Retrofit Installation Subtypes

Retrofit methods work with your existing window frame. That means the installer must match the approach to your home’s siding, wall depth, and window style. Here are the two most common types.

Flush fin installation is often used on homes with stucco or aluminum siding. The new window slides into the existing frame. A thin outer flange, called the flush fin, covers the old frame and creates a clean look.

Why homeowners choose flush fin:

• Hides the existing frame completely
• Avoids the need for exterior wall work
• Offers a smooth finish with minimal patching

This method is popular in warmer climates, especially in homes with stucco exteriors. It delivers a modern upgrade without removing any surrounding materials.

Block frame installation is a simpler retrofit method. The new window fits tightly into the existing frame without any flanges or outer trim. It works best in homes with wood or brick siding where the original trim and frame are still in good shape.

Key benefits of block frame:

• Preserves the home’s original trim and appearance
• Offers a clean, low-profile interior look
• Great for traditional or classic home designs

This option is ideal for older homes with solid wood frames. It allows for energy-efficient updates without changing the home's original character.

Full-Frame Installation Subtypes

Full-frame installation methods start from scratch. The entire window system is removed, and the new unit is installed with additional sealing and framing. These subtypes add flexibility for design and construction needs.

Nail fin windows are designed for new construction or major renovations. They have a built-in metal or vinyl flange that wraps around the outer edge of the frame. Installers secure the flange directly to the home’s wall studs using nails or screws.

Why builders choose nail fin:

• Creates a strong, waterproof seal
• Perfect for building new homes or replacing damaged frames
• Works well with siding, brick, and stucco

This method ensures structural strength and maximum energy efficiency. It’s one of the most common full-frame approaches in the construction industry.

Brickmould installation combines the performance of nail fin with decorative trim around the window. It offers both function and curb appeal. The exterior trim, or brickmould, frames the window for a finished, classic look.

Top reasons to choose Brickmould:

• Adds visual charm and architectural detail
• Often used in colonial or traditional-style homes
• Works well for full-frame replacements

Brickmould installations help homeowners blend the performance of modern windows with the style of older homes.

Each of these subtypes serves a specific purpose. Whether you’re upgrading stucco windows with flush fin inserts or building from scratch with nail fin frames, choosing the right installation method is key.

How to Choose the Right Window Installation Type

Choosing the right window installation method depends on your home, your goals, and your budget. Both retrofit and full-frame options offer unique benefits. But selecting the wrong one could lead to long-term issues or extra costs.

To make the best choice, ask yourself a few important questions.

Key Questions to Ask

1. Is your existing window frame in good condition? If it’s solid and free from damage, retrofit installation might be all you need. But if it shows signs of rot, warping, or water damage, full-frame replacement is likely the better option.

2. Are you remodeling or starting from scratch? For major renovations or new home builds, full-frame installation gives you more design freedom. If you're simply upgrading old windows, a retrofit approach may save time and money.

3. Is energy efficiency a top priority? Both methods can be energy-efficient, but full-frame installations allow for better insulation around the entire window. If you want maximum energy savings, full-frame may be the smarter choice.

As you can see, each option serves a different purpose. Retrofit installation works best for quick upgrades and budget-conscious projects. Full-frame installation suits homeowners who want a long-term investment, especially when dealing with structural concerns or design changes.

Talk to a Local Expert Before You Decide

While this guide gives you a strong foundation, your home is unique. The best way to make the right decision is to speak with a qualified window professional. They can assess your current windows, explain your options, and help you plan your project with confidence.

How Billy.com Helps with Window Installation Projects

Finding a trusted professional for your window installation project shouldn’t be a hassle. At Billy.com, we make the process simple, fast, and reliable by connecting you with licensed contractors who specialize in a wide range of window services.

Whether you're planning a full-frame installation or a retrofit upgrade, our platform helps you make confident, informed choices—without the stress of endless research.

One Platform, Many Pros

Billy.com partners with experienced window contractors across the country. Every professional in our network is fully vetted for licensing, experience, and quality. We help you connect with experts who know how to handle all major window installation types, from full-frame replacements to retrofit solutions.

All you have to do is tell us what you need. We’ll match you with professionals in your area who are ready to get started.

Services Related to Windows

We cover a full range of window services to meet your needs, including:

• Window installation for new homes and remodels
• Window repair for damaged or malfunctioning units
• Full-frame construction for structural upgrades
• Retrofit upgrades for fast, efficient replacements
• Custom energy-efficient windows tailored to your home and climate

No matter the project size, our pros offer high-quality solutions that align with your goals and budget.

Fast, Free Quote Comparison

Billy.com makes comparing contractors quick and easy. Simply enter your ZIP code and a few details about your project. Within moments, you’ll receive quotes from trusted local pros—no hidden fees, no pressure.

You get the freedom to compare services, check ratings, and choose the right expert for your home. It’s all about saving time while ensuring quality results.

Upgrade Your Windows the Right Way

Choosing the right window installation type can make all the difference in how your home looks, feels, and performs. From full-frame replacements to simple retrofit upgrades, the method you choose should match your home’s structure, your goals, and your budget.

Now that you understand the pros and cons of each approach, you're ready to make a more informed decision. But you don’t have to do it alone.

At Billy.com, we simplify your next home project by connecting you with trusted, local window installation experts. Whether you're remodeling, building new, or just improving energy efficiency, we help you find the right pro—quickly and easily.

Get Started Today

Don’t waste time searching and second-guessing. Compare free quotes from licensed professionals in your area today. Just enter your ZIP code, tell us what you need, and let Billy.com do the rest.

Click here to connect with top-rated window installation contractors near you.

Your home deserves the best. Let us help you get there one window at a time.

FAQs About Window Installation Types

Can I install a new construction window in an existing wall?

Yes, but it usually requires full-frame installation. The process involves removing the old window, trim, and sometimes siding to access the wall studs. It’s more labor-intensive but allows for a fresh start.

How long does each method take?

Retrofit installation typically takes a few hours per window and can be completed in a day or two. Full-frame installation takes longer—especially if structural repairs or finishing work are needed.

Which is better for resale value?

Full-frame installation offers higher resale value. It ensures long-term performance and visual upgrades, especially when paired with energy-efficient windows. However, high-quality retrofit jobs can also make a strong impact.

What’s the lifespan of retrofit vs. full-frame windows?

Both can last 20 to 30 years or more with proper installation and maintenance. Full-frame windows may offer slightly better durability due to improved insulation and framing.