Preserving the Beauty and Legacy of Stained Glass

For more than two decades, the American Consultation on Stained Glass (ACSG) has helped churches, temples, and historic buildings across the United States understand, preserve, and plan for their stained glass windows. From historical research and condition evaluations to insurance replacement-cost assessments and restoration planning, ACSG provides independent guidance grounded in decades of stained glass experience.

Whether your windows need restoration, protection, documentation, or simply a better understanding of their history and significance, we're here to help.

Why Churches Choose ACSG

Stained glass windows are often among a church's most treasured assets—artistically, historically, and spiritually. Yet many congregations are uncertain about their windows' condition, significance, replacement value, or restoration needs.

ACSG serves as a trusted advisor, helping churches make informed decisions about the care and preservation of their stained glass. Because we are independent consultants, our recommendations are focused on what is best for your windows and your congregation.

Our Services

We document and evaluate stained glass windows, helping churches better understand their condition, craftsmanship, historical significance, and preservation needs.

Insurance Replacement-Cost Assessments

ACSG provides estimates of the cost to replicate stained glass windows in the event of a catastrophic loss. These assessments can help churches and insurance providers establish appropriate coverage levels and plan for the future.

Restoration Planning

Not sure where to begin with a restoration project? ACSG can help develop restoration priorities, review proposals, and connect churches with qualified stained glass studios and conservation professionals.

Protective Glazing Consultation

We evaluate existing protective glazing systems and provide recommendations for protecting stained glass while maintaining proper ventilation and long-term preservation.

Historical Research

Many churches know little about the origins of their windows. ACSG can help uncover the stories behind the artists, studios, and history that make each window unique.

Decades of Specialized Experience

ACSG combines scholarly research with hands-on stained glass expertise.

Carrie Crow Thiele entered the stained glass field in 2005 under the mentorship of Dr. Gary Gray, founder of ACSG. Together they authored The Stained Glass Appraisal Guide and The Stained Glass Bible, resources that have helped churches and stained glass professionals better understand the history, preservation, and valuation of stained glass windows.

Consultant Kelly Hilburn brings nearly 30 years of experience in stained glass installation, fabrication, restoration, and building preservation. His practical knowledge of stained glass construction and restoration provides valuable insight for churches facing repair or preservation decisions.

Together, ACSG has served hundreds of churches and religious institutions across the country.

ACSG Publications

The Stained Glass Appraisal Guide is a must have for everyone concerned with the preservation of stained glass windows. The second edition of the appraisal guide is the ultimate how-to book for religious institutions, church insurance companies, and the entire stained glass industry. This full-color, 280-page guide contains research results from 22 major stained glass studios. Learn how to plan for new stained glass and how to restore, protect and insulate aging stained glass.

The Stained Glass Bible: For centuries, stained glass has infused the sanctuary with "scripture held up to the light." Through the release of brilliant hues, the power and mystery of God's story has been told to billions across the decades. The Stained Glass Bible captures this feast of light and color as seen in windows throughout the country, paired with the beauty of God's Holy Word. Now you can read the scripture and see it visualized at the same time - what better way to experience the message that religious leaders have sought to share over the millennia? 

Articles by ACSG