Retro Fit vs Brick-to-Brick Installation: Which Window Replacement Option Is Right for Your Home?

Understand the differences, benefits, and what homeowners should consider before replacing their windows.

Before You Replace Your Windows, There Is One Important Decision to Make

Many homeowners begin the window replacement process focused on style, glass options, colours, or energy efficiency. While these are important considerations, one decision often has a major impact on the overall project and long-term performance. Many homeowners evaluating replacement projects are also considering broader home improvement trends and how long-term upgrades can improve overall comfort and efficiency. 

How your windows are installed matters just as much as the windows themselves.

When replacing windows, homeowners will commonly hear two terms: Retro Fit installation and Brick-to-Brick installation, also known as 'rip out installation' or full tear out. While both methods are designed to improve your home, each approach serves a different purpose and comes with its own advantages.

Understanding the differences can help you make a more informed decision, but from our experience, the right installation approach is often determined by the condition of the existing opening rather than simply choosing the faster or less expensive option. Just as important, make sure you are working with a qualified installation team. Even the right product and installation method can underperform if the work is not completed properly, which can affect long-term performance, energy efficiency, and overall results.

What Is a Retro Fit Installation?

Retro Fit installation, sometimes referred to as insert installation, involves installing a new window within the existing frame structure while preserving the original frame and surrounding finishes. Rather than removing the entire window assembly, the new unit is installed into the existing opening, making it an option when the current frame remains in good condition and there are no signs of structural concerns.

A typical Retro Fit installation process generally includes the following steps:

1. Removal of the Existing Window

The existing window is removed while keeping the original frame in place up to the jamb. The new window is then installed and secured within the existing opening.

2. Interior Finishing

The interior trim and finishes remain intact, which helps minimize disruption inside the home. A caulking bead is applied along the jamb line where the new window meets the existing frame to create a clean finished appearance and help provide an airtight seal.

3. Insulating the Exterior Cavity

The cavity between the new window and the wall structure is insulated to help improve performance and reduce air movement. Since the spacing between the new window and the wall is typically minimal in a Retro Fit installation, only a small amount of insulation may be required. Foam insulation is commonly used, although other insulation methods may also be applied depending on the installation requirements.

4. Exterior Finishing and Sealing

Custom aluminum capping is bent onsite to cover exposed wood and conceal the insulated areas. A bead of caulking is then applied around the aluminum to help seal the installation and reduce the chance of moisture or outdoor elements getting behind the capping and into the wall assembly.

This installation method is typically selected when the existing frame remains in good condition and can continue to provide a solid foundation for the new window.

Benefits of Retro Fit Installation

Retro Fit installation is often chosen because it can provide a faster and less invasive replacement process.

Some common benefits include:

• Less disruption to interior and exterior finishes

• Shorter installation time

• Lower upfront project cost in many situations

• Reduced labour requirements

• Faster completion for homeowners

Because much of the existing structure remains untouched, Retro Fit installations can also be a practical option when homeowners want to preserve surrounding finishes.

Considerations for Retro Fit Installation

While Retro Fit installations work well in many situations, they are not always the ideal solution.

Because the original frame remains, certain conditions may limit long-term performance.

Things to consider include:

• Existing frame damage may remain hidden

• Older insulation or sealing issues may not be addressed

• If you are replacing your windows because of drafts around the window area, a Retro Fit installation may not fully resolve the issue, as the source of the draft within the existing frame or surrounding structure may remain

• Slight reduction in glass viewing area due to the new frame sitting inside the existing frame

• Limited opportunity to inspect surrounding conditions

Retro Fit installations depend heavily on the condition of the existing window structure.

What Is a Brick-to-Brick Installation?

Brick-to-Brick installation involves removing the entire existing window system, including the frame, down to the rough opening. This method allows installers to fully expose the surrounding structure and install a completely new window assembly. Although it is a more involved process, Brick-to-Brick installation provides a more complete replacement solution.

A typical Brick-to-Brick installation process generally includes the following steps:

1. Removal of the Existing Window and Frame

The existing window, frame, jambs, and trim are removed, exposing the rough opening and surrounding stud framing. This provides full access to inspect the condition of the opening before the new window is installed.

2. Installation of the New Window and Interior Finishing

The new window is installed into the opening, and new factory-assembled jamb extensions and interior trim are installed to create a finished appearance inside the home.

3. Insulating the Opening

The space around the new window is insulated to help reduce air leakage and improve energy efficiency. Foam insulation is commonly used to create a continuous seal between the window and the surrounding structure.

4. Exterior Finishing and Sealing

The exterior is finished using a factory-assembled brickmould, which provides a clean transition between the window and the home's exterior. A bead of exterior-grade caulking is then applied to help seal the window to the surrounding brick, siding, stucco, or other exterior cladding materials.

Because the entire window assembly is replaced, Brick-to-Brick installation provides the opportunity to inspect, repair, and properly seal areas that would otherwise remain hidden behind the existing frame. This is one reason it is often recommended when long-term performance, air sealing, and overall condition of the opening are primary considerations.

Benefits of Brick-to-Brick Installation

Because the full assembly is removed, installers have the opportunity to inspect areas that would otherwise remain hidden. In many cases, this can reveal issues that may not be visible from the surface, especially in older homes where materials have been exposed to years of weather and seasonal movement.

Some of the advantages include:

• Full access to inspect the opening

• Opportunity to replace aging insulation and sealing

• Maximum glass viewing area

• Improved long-term performance potential

• Better ability to address air leaks and create a more complete seal around the window opening

• Ability to identify moisture or structural concerns early

This approach is especially valuable for older homes where unseen deterioration may exist behind existing materials. Improving insulation and sealing can also support many of the same goals discussed in our Energy Star guide for spring and summer. 

Considerations for Brick-to-Brick Installation

While Brick-to-Brick replacement offers many benefits, homeowners should understand that it can involve additional work.

Factors may include:

• Higher installation costs

• Longer installation times

• More exterior and interior finishing work

• Additional labour requirements

Although the upfront investment may be greater, many homeowners view it as a long-term investment in overall performance.

Retro Fit vs Brick-to-Brick: Understanding the Main Differences

Both installation methods are designed to improve your home's performance, but they approach the replacement process differently. Rather than one option being universally better, each has strengths depending on your home's condition and long-term goals.

Retro Fit Installation May Be a Better Fit If You Want:

• A shorter installation process

• Less disruption to existing interior and exterior finishes

• A lower upfront project cost in many cases

• To preserve existing framing that remains in good condition

• A practical solution for relatively newer windows and structures

Keep in mind that because the existing frame remains in place, hidden issues around the opening may not always be visible.

Brick-to-Brick Installation May Be a Better Fit If You Want:

• A complete replacement of the entire window system

• Full access to inspect the rough opening and surrounding structure

• Opportunities to improve insulation and sealing

• Maximum glass viewing area

• A more comprehensive long-term solution for older homes

Because this process removes the entire window assembly, it can also help uncover moisture damage or deterioration that might otherwise remain hidden.

Which Installation Method Is Better?

From our perspective, there is no universal answer because every home presents different conditions. The goal is not simply to choose one method over another. It is to select an installation approach that addresses the home's actual needs and supports long-term performance.

The right choice often depends on factors such as:

• Age of the home

• Existing window condition

• Signs of moisture damage

• Budget considerations

• Long-term goals

• Desired performance improvements

For example, a relatively newer home with well-maintained frames may be a good candidate for Retro Fit installation.

On the other hand, homes with aging windows, visible deterioration, drafts, or long-term performance concerns may benefit from a more complete Brick-to-Brick approach.

Other Types of Window Installation Methods

While Retro Fit and Brick-to-Brick are commonly discussed for replacement projects, there are other installation methods that may be used depending on the project requirements.

Modern Touch Installation

A Modern Touch installation is typically used when the interior design does not include traditional jamb extensions and trim. This approach still involves a full Brick-to-Brick removal, but instead of finishing the interior with trim, a drywall return is created around the window opening. This allows the contractor or homeowner to finish the drywall directly up to the window for a cleaner, more modern appearance.

New Construction Installation

New Construction installation is typically completed during the earlier stages of building a home or addition. The final interior and exterior finishes help determine the window accessories and finishing details required for the installation.

In most cases, the window is secured directly into the opening and foam insulation is added around the perimeter. Remaining finishing work, including trim, drywall, siding, or exterior details, is generally completed by the builder or contractor as construction progresses.

Why Proper Installation Matters

Even high-quality windows can underperform if the installation process is not completed properly. A quality installation helps support:

• Energy efficiency

• Air and water sealing

• Long-term durability

• Smooth operation

• Overall comfort inside the home

In our experience, long-term performance often depends as much on the installation approach as the product itself. The quality and experience of the installation team also play an important role, as even a high-quality window can underperform if it is not installed correctly. The installation method should support the condition of your home rather than simply provide the quickest replacement option.

Common Signs It May Be Time to Replace Your Windows

If you are considering window replacement, certain signs may indicate that your current windows are no longer performing efficiently.

Watch for:

• Drafts near windows

• Difficulty opening or closing

• Condensation between glass panes

• Rising energy costs

• Visible deterioration around frames

• Water infiltration or moisture concerns

Identifying these issues early can help homeowners plan proactively rather than waiting for larger problems to develop. If you are noticing these signs, you can also explore our window options in our showroom to better understand what solutions may fit your home. 

Making the Right Choice for Your Home

Choosing between Retro Fit and Brick-to-Brick installation is not simply about cost or installation time. It is about understanding your home's condition and selecting an approach that supports long-term comfort and performance.

The right solution depends on your home's needs, your goals, and the condition of the existing structure. A well-planned installation does more than replace an old window. It helps improve comfort, efficiency, and long-term performance.

If you are considering replacing your windows and are unsure which installation method makes sense for your home, GEM Windows & Doors can help.

Our team works with homeowners to evaluate existing conditions and recommend solutions that align with both performance goals and budget considerations.

Explore our window options or contact GEM Windows & Doors to book your assessment.