Honest, Expert Stained Glass Appraisal & Consulting
Protecting your stained glass investment with independent, unbiased appraisals and consulting. We work for you — not a studio. Serving churches, institutions, and collectors internationally.
Your Windows Deserve an Unbiased Advocate
Many stained glass studios offer "free" inspections — then recommend their own restoration work. That's a conflict of interest, and it can cost you thousands.
NSGCG is different. We are not a studio. We don't sell glass or perform restoration work. Our only job is to give you honest answers and specifications that protect your investment.
- Independent evaluations — no ties to any studio
- Owner-representative approach — we work for you
- Comprehensive documentation you can trust
- Clear, plain-language recommendations
Comprehensive Stained Glass Expertise
From appraisals and inspections to restoration consulting and project management — everything you need to protect, preserve, and enhance your stained glass windows.
Stained Glass Appraisals
Professional valuations for insurance, estate, market, and replacement cost. Accurate, defensible documentation that protects your assets.
Get an AppraisalInspections & Condition Reports
Thorough structural and aesthetic evaluations with comprehensive documentation and preservation recommendations.
Learn MoreProject Management
Complete project oversight as your owner's agent — from writing specifications to vendor selection, quality control, and final walkthrough.
Learn MorePhotographic Documentation
High-resolution digital imaging and archival-quality records using reflected and transmitted light techniques.
Learn MoreHistorical Restoration
Expert guidance for historically accurate restoration. We write specifications and manage projects to preserve artistic integrity.
Learn MoreProtective Coverings
Independent specifications for protective glazing systems that safeguard your windows from environmental and accidental damage.
Learn MoreWe Work for You — Not a Studio
When you hire NSGCG, you get an independent advocate. We don't sell glass, we don't perform restoration, and we don't earn commissions from vendors. Our only interest is giving you honest, expert guidance.
- Unbiased recommendations — always
- Owner-representative on every project
- Clear specifications that protect your budget
- Long-term preservation strategies
Frequently Asked Questions
Find answers to common questions about our stained glass consulting services.
Trusted by Clients Nationwide
Hear from churches, collectors, and institutions who trust NSGCG for honest, expert stained glass guidance.
"Professional and accurate. I highly recommend them for your stained glass appraisals."
National Stained Glass Consulting did an excellent job with my appraisal. They were detail oriented with a quick turnaround time.
"Outstanding expertise — masterful analysis from just a few photos."
Karl gave me meticulous details about the glass, lead, and solder from my 1911 window — even a well-educated guess as to who made it. Quite prompt, with a very reasonable fee.
"His efforts far exceeded anyone else's — a truly non-biased professional assessment."
Karl took time to help me identify the origin and value of my stained glass pieces. I can tell when someone is genuinely looking out for my best interest. Very professional, very helpful.