Professional Window & Door Installation Done Right
At Willamette Valley Window, we believe the quality of the installation is just as important as the quality of the product itself. Even the best replacement windows and doors can underperform if they are not installed correctly.
Our team takes a careful approach to every project, ensuring your new windows and doors are properly integrated into your home's weather barrier system. This helps protect against moisture intrusion, air leaks, drafts, and long-term structural issues while maximizing energy efficiency and performance.
Every home is different. That's why we evaluate each project individually and use installation methods that match your home's construction. Whether your home features modern wall assemblies, single-wall construction, or historic wood window framing, our experienced installers follow proven practices designed to provide long-lasting results.
From the initial measurements to the final cleanup, our goal is simple: deliver a professional installation that looks great, performs properly, and stands the test of time.
Understanding Your Home's Installation Method
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Non-Manufacturer Specific
With a consultative approach, our estimate process helps you find the replacement window or door from multiple manufacturers. While arming you with the knowledge of the differences and how they work with your home to weatherize and protect.
Comparative Estimates
We provide comparative quotes and information on all options. This allows you, as the homeowner, to make the best decision for your window or door project.
Certified Installers
Our window door installers have years of experience and undergo regular training to ensure safe, manufacturer-approved installations, which exceed building codes.
Timely & Clean Installations
We respect your time and property. Our team arrives on schedule, works efficiently, and leaves your space clean and windows and doors looking great.
How It Works
Installation is the most important part of your replacement project — we ensure your new windows are fully weatherized with top-quality materials while implementing processes that go far beyond industry standards.
We realize the investment our clients make in their home, and we do our part in making sure this investment lasts as long as possible, looking great, and protecting your home.
Schedule a Consultation
We’ll evaluate your space, discuss your cooling needs, and recommend the best unit for your home and budget.
Get a Transparent Quote
After the assessment, we’ll provide a clear quote that includes all installation costs, with no hidden fees.
Professional Installation
Our technicians will arrive on time and complete the job with attention to detail. We test everything and leave your space clean.
Post-Installation Support
We walk you through how to use your new window and/or door, how you should care for them, and what to do if anything were to happen down the road.
Dual-wall Window Installation
Dual-wall installation is the most common installation method, and most homes built in the last 35 years are built this way. The exterior wall consists of sheathing, a weather-resistant barrier (or WRB), and siding (or cladding). This is an ideal system for shedding water and creating durability to the outer shell of the home.
Window Removal
For a dual wall installation, the original window is first removed from the wall, exposing each layer of the weather envelope. This is important so we can incorporate the new window and flashing into the existing weather envelope.
Prep Opening & Install
The next step is to prep the opening and install the window. This consists of a series of flexible flashing membranes, as well as a rigid, metal flashing. These are layered from the bottom to the top, to account for water running down a wall, not exposing seams to failure from above. The nailing flange of the window is then wrapped with an additional layer of flexible membrane flashing.
Flash and Trim
After the window and the flashing membranes are installed, the head flashing is installed, and the exterior trim is installed. This is then sealed to the exterior siding using an elastomeric sealant, with care taken not to seal the flashing to the above siding, to allow for water drainage.
Final Touches
Once the installation is completed, the window is thoroughly cleaned and after a 24 hour cure time for the sealants, ready for the trim to be painted.
Window Removal
For a dual wall installation, the original window is first removed from the wall, exposing each layer of the weather envelope. This is important so we can incorporate the new window and flashing into the existing weather envelope.
Prep Opening & Install
The next step is to prep the opening and install the window. This consists of a series of flexible flashing membranes, as well as a rigid, metal flashing. These are layered from the bottom to the top, to account for water running down a wall, not exposing seams to failure from above. The nailing flange of the window is then wrapped with an additional layer of flexible membrane flashing.
Flash and Trim
After the window and the flashing membranes are installed, the head flashing is installed, and the exterior trim is installed. This is then sealed to the exterior siding using an elastomeric sealant, with care taken not to seal the flashing to the above siding, to allow for water drainage.
Final Touches
Once the installation is completed, the window is thoroughly cleaned and after a 24 hour cure time for the sealants, ready for the trim to be painted.
Singal-wall Window Installation
Single-wall installation is a construction method that uses a single-layer outer wall. Instead of sheathing, a weather-resistant barrier, and siding, the home has a single layer attached to the framing for the outside wall. A common product using this building method is T1-11. Another term we use for a single-wall installation is barrier method. For this installation method, we have less to rely on to keep water channeled away from the inside of the house, so care must be taken to create a strong barrier from water penetration.
Window Removal
For a single-wall installation, the first step is usually to cut out the existing window. The original windows are usually attached directly to the studs, with the nailing flange sitting under the siding. The siding needs to remain as undisturbed as possible to maintain the water barrier and the wall's shear strength. The original window is cut free from the framing so the new window can attach directly to the single wall.
Prep Opening & Install
The opening is then prepped in a similar manner as the dual wall system, with a flexible, butyl backed membrane flashing layered from the bottom to the top. The window is installed, and the membrane flashing is sealed over the nailing flange of the window. This is the secondary weather envelope, if the sealant on the trim fails, the membrane flashing will route water away from the opening and maintain the barrier to the exterior.
Flash and Trim
Finally, the Window is trimmed, and a generous bead of an elastomeric sealant is applied to the top and sides of the trim. Care is taken not to seal the bottom edge of the trim to the wall allowing water to escape if needed.
Final Touches
Once the installation is completed, the window is thoroughly cleaned and after a 24 hour cure time for the sealants, ready for the trim to be painted.
Window Removal
For a single-wall installation, the first step is usually to cut out the existing window. The original windows are usually attached directly to the studs, with the nailing flange sitting under the siding. The siding needs to remain as undisturbed as possible to maintain the water barrier and the wall's shear strength. The original window is cut free from the framing so the new window can attach directly to the single wall.
Prep Opening & Install
The opening is then prepped in a similar manner as the dual wall system, with a flexible, butyl backed membrane flashing layered from the bottom to the top. The window is installed, and the membrane flashing is sealed over the nailing flange of the window. This is the secondary weather envelope, if the sealant on the trim fails, the membrane flashing will route water away from the opening and maintain the barrier to the exterior.
Flash and Trim
Finally, the Window is trimmed, and a generous bead of an elastomeric sealant is applied to the top and sides of the trim. Care is taken not to seal the bottom edge of the trim to the wall allowing water to escape if needed.
Final Touches
Once the installation is completed, the window is thoroughly cleaned and after a 24 hour cure time for the sealants, ready for the trim to be painted.
Buck Frame Installation
Buck frame installation is an installation type found almost exclusively on historic homes. These homes are built with a very durable window box, with a sloped sill for water management, built into the framing of the house. This is, in many cases, a window fortress that has stood the test of time (usually 100 years or more) and if at all possible we aim to maintain that system rather than replace it. A buck frame window typically has wood framed window sash, which are removed, and a new window is installed into the pocket created by the buck frame in the wall.
Window Removal
The first step of the installation is removal, the original window stops that surround the opening are gently removed, the window sash are removed, and the parting bead is removed. The iron weights that are in the wall are cut from their pulleys, and the pulleys are removed. The pocket is then insulated from the pulley locations.
Prep Opening & Install
Next, the window is installed in the opening and anchored in multiple locations. This ensures proper function, operation, and alignment. It is sealed to the buck frame from the jamb and the outside.
Flash and Trim
Finally, the stops are reinstalled, or new stops are installed, sealed to the interior, and after a 24 hour cure time, is ready for touch up paint.
Window Removal
The first step of the installation is removal, the original window stops that surround the opening are gently removed, the window sash are removed, and the parting bead is removed. The iron weights that are in the wall are cut from their pulleys, and the pulleys are removed. The pocket is then insulated from the pulley locations.
Prep Opening & Install
Next, the window is installed in the opening and anchored in multiple locations. This ensures proper function, operation, and alignment. It is sealed to the buck frame from the jamb and the outside.
Flash and Trim
Finally, the stops are reinstalled, or new stops are installed, sealed to the interior, and after a 24 hour cure time, is ready for touch up paint.
See What Our Customers Are Saying
Quality Products & Installation
“They gave us quality products and construction. We are very happy customers and recommend if you are looking at a window project, grab them before they get super busy.”
-David and Laura M. Happy Valley OR
Integrity & Professional
“Integrity, commitment to excellence, detail oriented, prompt communication, professional, and a pleasure to have in our home.”
-Bruce V. Silverton OR
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Everything You Need to Know
At Willamette Valley Window, we specialize in professional residential window and door replacement services designed for comfort, efficiency, and reliability.
Why is professional installation important?
Proper installation helps ensure your new windows and doors perform as intended. A quality installation can improve energy efficiency, reduce drafts, help manage moisture, and maximize the lifespan of the product.manage moisture, and maximize the product's lifespan
What is a weather envelope?
A home's weather envelope is the system of materials that protects the structure from water, air, and moisture intrusion. Proper window and door installation is critical because new products must be integrated into this system correctly to maintain long-term perfocorrectly integrated into the system rmance.
How do you determine the best installation method for my home?
Every home is different. Our team evaluates the construction of your home, existing window or door conditions, and wall assembly before determining the most appropriate installation method.
What is a dual-wall installation?
Dual-wall construction typically consists of sheathing, a weather-resistant barrier, and exterior siding. This is the most common wall assembly found in newer homes and allows us to properly integrate flashing and moisture-management systems into the wall.
What is a single-wall installation?
Single-wall construction uses a single exterior wall layer attached directly to the framing. Homes with T1-11 siding often use this building method. Special care is required during installation to maintain the home's weather resistance and structural integrity.
What is a buck frame installation?
Buck frame installations are commonly found in historic homes. Rather than removing the entire window system, the existing wood frame is often preserved while a new replacement window is installed within the original opening.
Can you install windows in older homes?
Yes. We regularly work on historic and older homes throughout the Willamette Valley and Portland Metro area. Our team evaluates each home's construction and recommends installation methods that preserve the home's character while improving performance.
Do homes built before 1978 require lead paint testing?
Yes. Federal and state regulations require testing for the presence of lead-based paint before certain renovation activities are performed on homes built before 1978. We follow all applicable lead-safe renovation requirements and procedures.
Will you protect my home during installation?
Absolutely. We take steps to protect flooring, furnishings, landscaping, and surrounding work areas throughout the installation process. Our goal is to leave your home clean and ready to enjoy.
How long does installation take?
Most replacement window and door installations can be completed in as little as one day once the products have arrived. Larger projects or those involving structural modifications may require additional time.
Do you remove and dispose of old windows and doors?
Yes. We remove existing windows and doors and properly dispose of them as part of our installation services.