Historic Window Products

Window Restoration Products

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  • CASE STUDIES

Resources

Project references, technical documentation, and answers to the questions we hear most often from architects, contractors, and project managers.

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  • COMPANY BACKGROUND

Project Case Studies

University of Oregon — Straub Hall

Secondary window glazing project involving the evaluation of multiple insulating upgrade options. Independent energy testing confirmed slim line insulating pane attachments provided near-identical performance to full IGU conversions at lower cost and with full preservation compliance. Hundreds of historic windows preserved.

Redmond City Hall

Historic restoration project recognised with the Restore Oregon DeMuro Award for Excellence in Preservation. Chosen Wood Windows served as the window restoration contractor

Grant High School Modernisation (1923) — Portland, Oregon

Extensive historic restoration project, also recognised with a DeMuro Award for Excellence in Preservation, Adaptive Reuse and Community Revitalisation.

Woodlark Hotel — Portland, Oregon

Union of two National Register of Historic Places buildings — the Woodlark Building and the Cornelius Hotel, each more than 100 years old. Chosen served as the window restoration contractor preserving the original architectural character of both structures.

  • FAQS

Frequently Asked Questions

Do your products comply with the Secretary of the Interior's Standards for Rehabilitation?

Yes. All three products storm windows, Window SLIP™, and replacement sash are designed to comply with the Secretary of the Interior’s Standards. No permanent alterations to historic fabric are required for any of our products.

We supply all three products directly. Installation by our team is available for select commercial projects in the Pacific Northwest. All products are designed for installation by qualified contractors and carpenters outside our region.
Lead times vary depending on product type, configuration, and order volume. Contact us with your project details for a current timeline.
Yes. All of our products have been specified and installed on National Historic Landmarks, National Register of Historic Places buildings, and projects subject to preservation board oversight.
Exterior storm windows are a separate unit installed over the existing window — typically as a secondary frame. The slim line insulating pane is a low-profile pane mounted directly to the existing sash, making the original window itself simulate a double-pane unit. Insulating panes are virtually invisible, do not alter window operability, and require no seasonal removal.
Yes. We reproduce virtually any glass pattern and sash configuration, including both true divided lites and simulated divided lites. We can match existing muntin profiles, spacing, and grid configurations.
Options include annealed, tempered, and laminated single-pane glass, as well as insulating glass units (IGUs) with air or argon gas fill and low-E coatings. Our default IGU glass is Solarban 60, which accurately replicates the appearance of original single-pane clear glass while delivering significantly improved thermal performance.
Yes. Contact us to request product specifications, U-value data, or technical documentation for your project file.
  • DOWNLOADS / DOCUMENTATION

Technical Documentation

  • Window SLIP™ Product Brochure Download PDF
  • Chosen Sash Replacement Catalogue Download PDF
  • Historic Wood Storm Windows Product Sheet (coming soon)
  • University of Oregon Straub Hall Energy Study Available via windowslip.com

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