Preservation-Grade Solutions for Historic & Landmark Buildings

Historic Window Products (HWP) designs and fabricates specialty window products for historic, landmark, and preservation-sensitive buildings. From custom wood storm windows to insulating glass systems and replacement sash, every product is engineered to improve performance without altering original sash profiles, materials, or sightlines.

Most original wood windows have already lasted 80 to 100 years. With proper care and the right products, they can easily outlast modern replacements that often degrade in just 20–30 years.

OUR PRODUCTS

Custom Wood Storm Windows
Preservation-grade interior and exterior storm windows, custom-built to fit original openings. Fully reversible, they improve thermal and acoustic performance while preserving the historic character of the building.

SLIP™ Insulating System
A high-performance insulating solution installed over existing glazing. SLIP enhances thermal performance without altering original sash, muntins, or profiles—meeting heritage registry requirements for both residential and commercial preservation boards. SLIPs can reduce energy bills by up to 72% and extend the life of original windows.

Custom Replacement Sash
Hand-built wood sash duplicated to match original profiles. Made to your project drawings in vertical grain fir, with modern glazing options available where energy performance is required.

WHY HISTORIC WINDOW PRODUCTS

For buildings under historic registry, visual integrity and reversibility are key to compliance. Our products meet these standards while delivering discreet, modern performance upgrades. Maintaining and upgrading original windows is a sustainable, cost-effective alternative to full replacement—preserving a building’s look and feel while improving efficiency for the life of the windows.

OUR COMPANY

Historic Window Products is part of the Chosen Wood Window Maintenance family, with a team that brings decades of experience repairing, restoring, and engineering new solutions for historic windows.

More Information: https://historicwindowproducts.com