Webinar: When Original Isn’t an Option: The Case for Substitute Materials

Historic preservation often starts with a simple principle: save the original whenever possible. But what happens when an original window, siding material, or decorative architectural feature has deteriorated beyond repair? Is it ever appropriate to use a substitute material?

These are questions that architects, preservation professionals, contractors, property owners, and design review boards face every day. They are also the focus of an upcoming educational webinar that explores one of the more nuanced topics in preservation practice.

• When Original Isn’t an Option: The Case for Substitute Materials

• Thursday, August 6, 2026

• 10–11 a.m. (Arizona/Pacific Daylight Time)

• Registration: https://register6.net/AHPC/

This Arizona Preservation Webinar, “When Original Isn’t an Option: The Case for Substitute Materials,” will be presented by architect Susan Lawson of the Arizona State Historic Preservation Office (SHPO).

The Secretary of the Interior’s Standards for Rehabilitation have long served as the foundation for rehabilitation projects involving historic buildings. One of their central themes is to repair rather than replace historic materials whenever feasible.Standard 6 specifically states that when deterioration makes replacement necessary, the new feature should match the original in design, color, texture, and, whenever possible, in materials.

Of course, preservation projects don’t always occur under ideal circumstances. Original materials may no longer be manufactured, may be prohibitively expensive, or simply may not perform well in today’s environment. Recognizing these realities, the Standards allow carefully selected substitute materials when they can closely replicate the appearance and performance of the historic material.

This webinar will explore how substitute materials can be used appropriately while still meeting the Secretary of the Interior’s Standards. Participants will gain a better understanding of when substitutes are acceptable, what factors should guide material selection, and how thoughtful decisions can help preserve the character and integrity of historic buildings.

About the Presenter

According to her childhood diary, Susan Lawson decided by the age of eight that she wanted to become an architect. Inspired by the historic campuses of the University of Virginia and Cornell University, where she received her education, she built her career around historic preservation and adaptive reuse. After two decades of professional practice and licensure in New York, she joined the Arizona State Historic Preservation Office in 2022 and considers it a privilege to serve the public by providing technical assistance in architecture and historic preservation. Outside of work, Susan fosters rescued pugs and enjoys trying to out-climb her husband and son at the local rock gym.

Whether you’re a preservation professional, architect, contractor, planner, or owner of a historic property, this webinar offers valuable guidance on balancing preservation principles with the practical realities of rehabilitation. It’s an excellent opportunity to deepen your understanding of one of the most frequently discussed – and often misunderstood – aspects of historic preservation practice.