Historic Window Sash Repair in St. Louis
We don't demo until we have the match on site. Your historic windows are irreplaceable—we repair and restore original sashes at 70-85% less than replacement cost.
Updated: January 2026
The Challenge of Historic Window Preservation
Historic wood windows in St. Louis homes were built to last generations. With proper repair and maintenance, original sashes from the 1800s continue functioning beautifully today.
If you own a historic home in Soulard, Lafayette Square, Tower Grove, Shaw, or Benton Park, your original wood windows are likely among the home's most valuable features. They're also the features most at risk from well-meaning but misguided replacement advice.
For homeowners dealing with rot beyond just the windows, the wood rot repair in St. Louis resource hub covers every exterior component—from window sashes to deck joists to fascia boards.
Window replacement companies have a simple pitch: your old windows are drafty, inefficient, and need to go. What they don't mention:
- Replacement windows last 15-20 years—your original windows have lasted 100+
- Original glass has character you can't replicate—wavy, imperfect, historic
- Properly restored windows with storm windows match new window efficiency
- In historic districts, replacement may require CRO approval—and be denied
Our Approach: Preserve First
We don't demo until we have the match on site. This isn't just a policy—it's our commitment to preserving irreplaceable historic elements of your home.
What We Repair
- Rotted sash rails and stiles
- Deteriorated window sills
- Damaged muntins and glazing bars
- Broken sash cords and weights
- Failed glazing and putty
- Paint failure and wood deterioration
Our Repair Materials
- Marine-grade epoxy consolidants for stabilization
- Borate treatment for rot prevention
- Period-appropriate wood when replacement needed
- Bronze weatherstripping for efficiency
- Traditional glazing putty or DAP 33
- Cotton sash cord for weight systems
Cost Comparison: Repair vs. Replacement
Historic window sash repair costs $150-$400 per window, saving 70-85% compared to replacement windows that cost $800-$2,500 per opening installed.
Repair & Restoration
10-window project: $1,500-$4,000 total
Window Replacement
10-window project: $8,000-$25,000 total
Historic District Window Considerations
In St. Louis historic districts, window changes visible from the street may require Cultural Resources Office review. In-kind repairs to existing windows typically don't need approval.
Districts We Serve
- Soulard
French Second Empire, Italianate
- Lafayette Square
Victorian, Italianate
- Tower Grove
Arts & Crafts bungalows
- Shaw
Victorian, Arts & Crafts
- Benton Park
Victorian, Federal
CRO Compliance
All repairs performed in compliance with St. Louis Cultural Resources Office (CRO) requirements. We document existing conditions, use historically appropriate materials, and can provide the documentation you need.
Our Promise: We don't demo until we have the match on site. If any component needs replacement, we ensure historically compatible materials are available before removing anything original.
Frequently Asked Questions
How much does historic window sash repair cost in St. Louis?
Historic window sash repair in St. Louis typically costs $150-$400 per window, compared to $800-$2,500 for replacement windows. Most homeowners save 70-85% by repairing rather than replacing.
Can rotted window sashes be repaired?
Yes, most rotted window sashes can be repaired using marine-grade epoxy consolidants and fillers. We can restore structural integrity while preserving the original wood profile. Only completely deteriorated sashes require replacement.
Do I need CRO approval for window sash repair?
In-kind repairs to existing windows typically don't require CRO approval in St. Louis historic districts. However, replacing windows with different styles or materials may require review from the Cultural Resources Office.
How long does window sash repair take?
Most window sash repairs take 2-4 hours per window. For extensive rot or multiple windows, we may remove sashes for shop repair and return them within 3-5 business days.
Are repaired windows as energy efficient as new windows?
Properly restored historic windows with weatherstripping, sash lock adjustment, and storm windows can match or exceed the energy performance of replacement windows, while preserving your home's historic character and value.
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Not Sure Whether to Repair or Replace Your Historic Windows?
Get matched with a vetted historic window specialist in St. Louis. They will assess your sashes honestly—and restore originals wherever possible rather than selling you replacements. See also our full guide on window frame restoration and the best window frame repair specialists in St. Louis.
Find a Specialist Near YouGet Matched With a Historic Window Specialist
Before you replace your original windows, get a repair assessment from a vetted specialist. We connect homeowners in Soulard, Lafayette Square, Tower Grove, Shaw, and Benton Park with historic window experts.
Stop Wood Rot Before It Spreads
Wood rot doesn't improve on its own — it only gets worse and more expensive. Get matched with a vetted local specialist and discover how much you can save with expert repair.
Serving all of Greater St. Louis including Clayton, Webster Groves, Kirkwood, Ballwin, Chesterfield, and surrounding areas