Products and Services


Change is coming

Welcome to PreserveList, Preservation Maryland’s online preservation services directory. This website is currently under construction, but listings are still accessible.

PreserveList was developed to connect preservation service providers with customers that are looking to care for their historic structures.  After the site’s full relaunch on January 1, 2023, PreserveList will be a free service to all, both those looking for preservation services and those interested in listing their relevant services.

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Window SLIP™

Construction Services, Energy & Efficiency, Windows

The SLIP™ (Slim Line Insulating Pane) is an innovative and cost-effective way to retain your original vintage windows while making them more efficient and saving you money. SLIPs are designed to update single-pane wood windows to modern standards. We have made it possible to add an additional pane directly to each sash. This simple solution can rejuvenate Single hung, double hung, casements, picture windows and more.