Window Soundproofing Solutions
From curtains to replacement windows—finding the right solution for your budget and noise level
The Window Problem
Windows are often the weakest point in a room's soundproofing. While walls might have an STC rating of 35-45, single-pane windows typically rate only STC 25-27, allowing 3-4 times more sound to enter. Even modern double-pane windows only achieve STC 28-32 unless specifically designed for soundproofing.
The challenge is that windows must provide light and ventilation while blocking sound—competing requirements that make window soundproofing more complex than wall soundproofing. The good news: multiple solutions exist for every budget and situation.
Solution Comparison
1. Soundproof Curtains
$80-200Heavy, multi-layer curtains with mass-loaded vinyl core. Easiest and cheapest option, providing 10-25% noise reduction while improving insulation and light blocking.
- • Very easy DIY installation
- • Renter-friendly (removable)
- • Bonus: light blocking & insulation
- • Wide style/color options
- • Limited effectiveness (10-25%)
- • Blocks natural light when closed
- • Bulky appearance
- • Won't help with severe noise
2. Acoustic Window Inserts
$250-500/windowClear acrylic or glass panels that mount inside your existing window frame, creating an air gap. Provides 50-70% noise reduction while maintaining view and natural light.
- • Excellent noise reduction (50-70%)
- • Maintains view and light
- • Removable (renter-friendly)
- • Better than curtains aesthetically
- • Moderate cost ($250-500/window)
- • Can't open window with insert in
- • Requires custom sizing
- • Some installation skill needed
3. Secondary Glazing
$600-1,000/windowA permanent second window installed inside your existing window. Creates sealed air gap with professional-grade acoustic glass. Achieves 70-80% noise reduction.
- • Excellent noise reduction (70-80%)
- • Professional appearance
- • Can open/close independently
- • Dramatic energy savings
- • Higher cost ($600-1k/window)
- • Professional installation needed
- • Permanent modification
- • Reduces sill depth
4. Soundproof Window Replacement
$800-1,500/windowReplace existing windows with specialized acoustic windows featuring laminated glass, asymmetric panes, and sealed frames. Maximum noise reduction of 80-90%.
- • Maximum noise reduction (80-90%)
- • Modern, clean appearance
- • Full functionality (open/close)
- • Increases home value
- • Expensive ($800-1.5k/window)
- • Requires professional install
- • Permanent (not for renters)
- • 2-4 week lead time typically
Cost Comparison
From budget-friendly to premium solutions
Materials
Labor
DIY Window Inserts vs. Professional Installation
Pros
- Save $200-400 per window on installation
- Work at your own pace
- Can start with one window and expand
- Easy to remove and reinstall
- Total control over materials and fit
Cons
- Professional-grade acoustic glass
- Perfect fit and seal guaranteed
- Faster completion (1 day vs. 1 weekend)
- Warranty on installation (typically 5-10 years)
- Handles complex window shapes/sizes
- Maximum STC performance
Key Takeaway
Window soundproofing follows a clear price-to-performance curve. Soundproof curtains ($80-200) provide modest 10-25% reduction—fine for light noise. Window inserts ($250-500) hit the sweet spot with 50-70% reduction at reasonable cost. Secondary glazing ($600-1k) and window replacement ($800-1.5k) achieve 70-90% reduction but cost significantly more. For most people facing moderate traffic noise, window inserts offer the best value. For severe noise (highway, airport), invest in replacement windows—the difference in quality of life is worth the cost.
Ready to soundproof your windows?
Not sure which solution is right for you? We can help you assess your noise levels and choose the best option for your budget.