Chosen Wood Window Maintenance, Inc.

Window Restoration

18574 Hwy. 99E
Oregon City, OR 97045
Phone: 503-266-3830
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Chosen Wood Windows is a premier window contractor that can repair, update, restore, and build your wood and steel windows at a fraction of the cost of complete window replacement. We work on on modern, vintage and historical windows. Preserve the look of your building and hold on to your valuable wood windows.

We offer a wide variety of services such as:

We serve both residential and commercial clients. Our residential services cater to the Pacific Northwest including both Portland, Oregon and Seattle, Washington. Our commercial services extend throughout the Pacific Northwest and beyond. More often than not, replacing wood windows is a poor economic and environmental decision. Most wood windows can be restored or repaired and upgraded to rival the performance of a standard replacement window at a reasonable cost

Don't give up the beauty, charm and enduring performance of your wood windows for replacement windows that are less than a perfect match. Repair by Chosen Wood Window Maintenance is the best option on the market! If your windows cannot be saved, we also offer services to build new sash and complete windows to your specifications.


Slim Line Insulating Pane SLIP™  

Drafty Windows? Lack of Energy Efficiency? Update and insulate your windows to modern standards with this reliable long term solution. Introducing the Slim Line Insulating Pane | SLIP™.

Over 20 years of experience restoring wood windows has made this product come to life. Modernize your single pane Windows and make your home more comfortable, with the SLIP™ (Slim Line Insulating Pane). This update is an innovative and cost-effective way to retain your original, and valuable, wood Windows, while making them more efficient, saving you money, and enhancing the comfort of your living space.

SLIPs are designed to update single-pane wood windows to modern standards of efficiency and operation. We have made it possible to add an additional TEMPERED pane directly to each sash overlaying your current glass setup. This essentially turns your single pane window into a simulated double paned window. The frame of the SLIP™ is an attractive, low profile, pressed metal extrusion. This simple solution can rejuvenate Single hung, double hung, casements, picture windows and more. This modernization is a long term solution that does not seasonally need to be reinstalled.

A SLIP™ will dramatically boost insulation power in your windows and will bring great savings to your month to month energy bills. In terms of insulation power, SLIPs have been tested and are comparable with insulated glass units. However, unlike true insulated glass, SLIPs will not fog up and succumb to seal failure and require periodic glass replacement, meaning lower future maintenance costs.

SLIPs are highly effective, well designed and well-priced, giving you superior value when compared to alternatives. SLIPs have a sleek look and feel with a low profile that blend into the sash; you'll hardly know they are there. Another key aspect is that SLIPs will ensure your window sash remains fully operable, without the need to open two sets of windows, or remove any components as you sometimes get with storm windows or inserts.

When installing SLIPs on doublehung windows, the weight of the balances needed for window operation may be adjusted. This can be done simply by adding weights into the weight pockets when operating with ropes and pulleys.

Hidden balances can also be fitted to the window if a more modern window operation methods is sought after.

● Increased energy efficiency

● Sound reduction

● Less expensive than a window replacement!

● Maintains original window glass

● Windows can stay historically accurate and functional

● Solid, well-designed construction and material

● Interior or exterior install

● Options of Clear, Obscure, or Low-e

● Tested and proven product

● Extremely low future maintenance cost


Energy testing was performed by the Energy Studies in Buildings Lab at the University of Oregon. Using results on the study, it was concluded that adding SLIP™ to the windows in an average household will result in a cost reduction of 72.9% for the windows.

  • -Single pane windows…454 THERMS and 474kWh

  • -Single pane window with added SLIP™…123 THERMS and 129kWh

  • -Single pane window with SLIP™ and weatherstripping…93 THERMS and 97kWh

A therm is a unit of measurement of energy (more specifically thermal energy).
The therm is used to measure gas consumption as well as consumer cost.

How to get SLIPs on your windows

The creator and manufacturer of the product, Chosen Wood Window, has been, and still does, install SLIPs on commercial and residential buildings in the Northwest for over a decade.

For people further out who are looking to modernize their windows, we highly recommend our SLIP™ Kit. We assemble, sell, and ship custom made DIY SLIP™ Kits. These kits contain all the custom sized materials that are needed for a successful install. Contractors and handy homeowners are highly encouraged to purchase these kits! We have a full length installation instruction video as well as a tutorial video on how to measure for your custom sized SLIPs. Please visit our YouTube page Here.

Based on the energy modeling that we did for the building, including live mock ups, the study showed that the SLIPS were very close to the energy performance of the IGU option, and given the lower cost the decision was made to go with the SLIP system. We are now three years into occupancy and have had no issues with the windows. The SLIPS are very unobtrusive, and we were able to save hundreds of historic windows and still met our stringent standards of energy performance that exceeds Oregon State Code."

George Bleekman, Owner's Representative, Capital Design & Facilities Management

Click to see the Energy Results and Product Studies

Click to see Energy Testing on the SLIP™

Reports & Case Studies


Rated 5 based on 1 product reviews

Vintage Window Options  

If you're a building owner or contractor that needs complete wood sash or complete windows, either for Chosen install or self-install, we can supply. We can shop build new sash to specs or replicate wood sash and complete windows of all different styles, shapes, and sizes. We have over 20 years working with and building wood windows. Our sash are built with high grade mortise and tenon joinery and quality glazing techniques.We use Dense and durable Vertical Grain fir as our default grain. As apposed to softwoods like pine, the fir product we use holds up better against dry rot. Other choices of wood may be available upon special request.


If you have existing windows that are beyond repair, we can replicate your existing setup and get you a new product; hand built with quality materials. We can replicate a wid
e variety of types and styles. From windows built over a century ago all the way to modern sash from big name manufactures.


With customer provided specs we can build new windows/sash for your project. Single lite or multi lite, double hung or casement; we can build a variety of different wood window styles.

  • Double-Hung

  • Casement

  • Picture Wndow

  • More upon request

Glass Options:
We offer several glass options, including:

● Single-pane or insulated tempered

● Insulated

● Laminated clear

● Tinted

● Low-e

● Obscure

● Architectural, etc.

Rated 5 based on 1 product reviews

Window Restoration:

For years Chosen Wood Window Maintenance has been offering full comprehensive window restoration service to commercial and residential customers. We can take on projects of various sizes, specs, and conditions. We work with general contractors, owners representatives, architects, and more to take the project to the final product. We also can work with building owners and self contract projects.

We are able to take the window restoration scope to the final installed product working within the range of the sash and frame. There are different magnitudes of window restoration and different options for updating and window finishes. Our full service window restoration, after the awarded project, starts at cataloging the openings and the components of each individual window. Components such as sash, stops, brickmold, and more will be marked so that the final restored product goes back into their matched original openings. This is not only important for historic buildings, but also the original components will match and function the best when installed in their original opening. Window openings are sealed up for interior protection. From there, we transport certain components to our restoration shop where we take the components through the restoration process that is tailored to your project. Along the way we take progress photos of the project for your records.

Rated 5 based on 1 product reviews

Chosen Wood Window Maintenance does indeed offer full-service window restoration, but also... in an effort to offer a broader range of affordable and quality window restoration options to more customers, Chosen Wood Window Maintenance offers shop only restoration options as well.

We realize that for some projects, possibly further away, it may be most cost effective for sash and millwork restoration to be handled by a facility that specializes in quality-efficient shop restoration, and for on-site restoration to be handled by one's own workforce or by another contractor. Our process yields a quality and uniform product that conforms to the customer's specific needs.

We have a background of restoring sash and millwork on many prestigious buildings.
We do not perform piece work, but rather we restore all ‘like sash' with the same restoration steps to achieve an efficient, dependable and uniform finished product. The following pages demonstrate a general process for achieving shop only restoration on your project from Chosen.

Click to Read our Shop Restoration Program

Rated 5 based on 1 product reviews

Go Green  

Environmentally conscious people are opting for restoration over replacement as a way to conserve energy, save money, eliminate waste of valuable wood resources, and reduce their carbon footprint. Window restoration proves to be an effective, environmentally friendly way to conserve resources by utilizing what has already been produced. In addition, replacement windows that contain vinyl or PVC are toxic to produce, create toxic by-products, and are not recyclable. By repairing, you rescue old windows from landfills; and once repaired, they can be maintained for the life of the building.

Chosen Wood Windows restores, rebuilds and reproduces sash, wood windows and doors. We reuse all the good wood components in the existing window.  Our philosophy is to reuse what is good and replace what is necessary. If we replace the glass with insulated glass, we reuse the distorted, wavy glass on other historical projects.

Restoring wood windows is the best way to go green and save on energy costs!

● Manufacturing replacement windows produces unnecessary waste

● Large amounts of energy are consumed to extract and process raw materials, then assemble, transport and install replacement windows

● Replacement windows use non-renewable resources, such as petroleum

● Forests are being depleted in the production of wooden replacement windows

● Replacement windows may contain toxins

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Read through our posts to learn the benefits of restoring and updating your windows

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Replacement Sash  

Upgrading sash on vintage windows oftentimes requires more specific information. These details ensure that you'll have all the necessary components to complete your vintage window repairs. 

  • Choose your Brand (if applicable)

  • Choose your Hardware

  • Choose your Sash Finish

  • Choose your Glaze

  • Choose your Lumber

  • Choose your Weatherstripping

  • Choose your Style Options

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It’s relatively common for manufacturers to discontinue their product lines at some point in time. This means you may not find a window sash to match your other windows. Luckily, Chosen catalogs sash profiles for some of the most popular brands to address this issue.


  • Marvin

Since their inception in 1912, Marvin has strived for quality materials and craftsmanship in window construction. Innovation has directed their brand to imagine a more thoughtful connection to the natural world while staying focused on function. Marvin understands that all of these components come together to enhance the day-to-day lives of their customers, and this is the driving force behind their efforts.

  • Weathervane

Founded in 1980, Weathervane focused on the sale and construction of wood windows throughout the 80s & 90s. Despite being built with high-quality lumber and hardware, many of these windows met the same foggy fate and are now in need of repair. Weathervane is a primary example of windows that only need a quick fix before being fully functional again.

Casement windows only

  • Pozzi

Arthur Pozzi created Pozzi windows in the late 1970s, and they were a serious force in Oregon until the early 2000s. Sold to Jeld-Wen in 1992, windows and doors were still offered under the Pozzi name for some time. Ultimately, they suffered a similar fate to Weathervane with their windows frequently suffering seal failures. Sash replacement helps address these issues and restore the functionality of most Pozzi windows. 

  • New & old window styles (pre-1985 and older)

  • Clad (reuse existing materials)

  • True divided light windows not offered

Rated 5 based on 1 product reviews