Professional inspection of stained glass windows in a restoration studio

Know Exactly What You Have — and What It Needs


A professional condition report is the foundation for every decision you make about your stained glass. Whether you're planning restoration, applying for insurance, or simply protecting your investment — it starts with knowing the full picture.

NSGCG condition reports are thorough, independent, and defensible — created by experts who understand both the craft and the business of stained glass preservation.

What's Included

Our Condition Reports Cover

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Structural Evaluation

Lead matrix, reinforcing bars, slip joints, window frames, and overall structural stability — documented with precision.

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Aesthetic Review

Paint condition, color integrity, historical accuracy, and assessment of any previous repairs or modifications.

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Photographic Documentation

Professional photography using both reflected and transmitted light, creating a permanent visual record of current conditions.

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Historical Research

Background investigation of studios, artists, installation dates, and prior restorations — adding context and value to every report.

Common Stained Glass Damage We Have Documented

Why It Matters

Condition Reports Protect Your Investment


  • Identify problems early — before they become expensive emergencies
  • Provide the documentation insurers need to approve proper coverage
  • Establish a baseline for measuring future deterioration
  • Pair with appraisals for comprehensive asset documentation
  • Give decision-makers the data they need — in plain language
Close-up detail of stained glass showing lead lines and glass craftsmanship
Common Questions

FAQs – Inspections & Condition Reports

Our reports document structural elements—lead matrix, framing, solder joints—and aesthetic conditions like paint. They become a baseline for maintenance and future restoration planning.

Yes, we differentiate natural aging (like patina) from urgent issues such as structural bowing. Our reports specify what needs immediate attention.

As independent consultants, we ensure recommendations align with actual conditions, with no bias toward selling repairs.

We assess more than leadwork—frames, support bars, and the entire installation—ensuring every structural factor is covered.

Condition reports provide documented proof of your window's state. They support appraisals, insurance claims, and valuation by offering a clear baseline.

Ready to Document Your Stained Glass?

A thorough condition report is the smartest first step. Contact us to schedule an independent inspection.