Accurate, independent valuations for insurance, estate, market, and replacement cost — trusted by churches, collectors, and institutions nationwide.
Many stained glass windows are significantly underinsured — sometimes by hundreds of thousands of dollars. An outdated or incomplete valuation puts your organization at serious financial risk.
NSGCG delivers professional, defensible appraisals prepared with deep industry expertise. Whether you need documentation for insurance, estate planning, donation, or sale — we provide comprehensive written reports that stand up to scrutiny.
Every stained glass appraisal is unique. We offer several types of valuations, each carefully prepared to meet your specific requirements.
Insurance AppraisalsReplacement cost valuations that ensure your windows are properly covered. Essential for churches and institutions with significant stained glass assets.
Fair Market ValueAccurate market valuations for buying, selling, or transferring stained glass. Defensible documentation that holds up in any transaction.
Replacement CostWhat would it cost to recreate your window today? Essential for insurance coverage and disaster planning, based on current material and labor costs.
Antique ValuationSpecialized appraisals for historically significant or antique stained glass, factoring provenance, artist attribution, and historical context.
Church & InstitutionalComprehensive appraisals for houses of worship and institutions — often involving multiple windows, large-scale documentation, and building committee coordination.
Estate & DonationProfessional valuations for estate planning, tax purposes, and charitable donations. Documentation prepared to meet IRS and legal requirements.
Multiple factors influence valuation. Our experts evaluate each element to deliver an accurate, defensible appraisal.
A studio that offers "free appraisals" has a built-in incentive to recommend work — their own work. That's not an appraisal; it's a sales pitch.
NSGCG provides truly independent valuations. We have no ties to any studio, no products to sell, and no restoration work to bid on. When we tell you a window is worth $50,000 — or that it needs $200,000 in restoration — you can trust those numbers.
The same window can carry several legitimate values. An appraiser's first job isn't simply to "put a value on the window" — it's to identify the purpose of the appraisal and the correct definition of value.
“What would it reasonably cost today to recreate this window using comparable materials, design, craftsmanship, support, and installation?”
Typically used for: insurance coverage & disaster planning
“What would this actual window reasonably sell for between a knowledgeable, willing buyer and a knowledgeable, willing seller?”
Typically used for: sale, estate, donation & acquisition
Two 100 sq. ft. windows can differ enormously — simple cathedral-glass geometrics versus hundreds of painted, kiln-fired, plated pieces.
A 15-foot memorial window may cost a fortune to reproduce yet have few buyers. A rare Tiffany original can be worth far more than any reproduction.
A recreation of a Tiffany or La Farge window is not the original. Replacement cost estimates the closest reasonable reproduction — not its authorship.
Wages, glass prices, collector demand, and supply all shift. A decades-old insurance schedule may no longer protect you.
Nine sections covering methodology, condition reports, documentation, a practical worked example, and how to choose the right appraisal.
Not sure which you need? Ask us →National Stained Glass Consulting company did an excellent job with an appraisal for my stained glass. They were detail oriented and did a quick turn around time with sending me the appraisal. Professional and accurate. I highly recommend them to hire for your stained glass appraisals.
Great communications! Very thorough and comprehensive appraisal in every way. A pleasure to talk with and do business!
We are remodeling our home and weren't sure if there was any value to the existing stained glass windows – so we went looking for an expert. Karl at National Stained Glass Consulting Group fit the bill. Karl advised us appropriately, and his expertise and input were very much appreciated. We would highly recommend Karl for your stained glass consulting needs.
Very professional, very educated on stained glass!
