What are Window Inserts?
Window inserts are removable acrylic or glass panels that mount inside your existing window frame using compression tubing or magnetic strips. They create an air gap that blocks sound transmission while remaining completely invisible from the outside and easily removable when needed. Unlike permanent secondary glazing systems, inserts offer the flexibility of DIY installation and complete removal when needed.
Budget-Friendly
Starting from £200-300 per window
DIY Installation
Install yourself in under 30 minutes
Renter-Friendly
Completely removable, no damage
How Window Inserts Work
Window inserts use the same acoustic principles as secondary glazing but with simpler installation. They're particularly effective for traffic noise reduction and creating peaceful bedroom environments:
- Air Gap: Creates 50-100mm space between existing window and insert panel
- Mass: 6-10mm thick acrylic or glass adds sound-blocking mass
- Sealing: Compression fit or magnetic edges prevent sound leakage
- Resonance Dampening: Different thicknesses prevent sound amplification
Types of Window Inserts
Acrylic Window Inserts
Lightweight, shatter-resistant, and optically clear. Best for DIY installation and frequently removed inserts.
- Noise reduction: 70-75%
- Cost: £200-350 per window
- Weight: Very light, easy handling
- Durability: Scratch-prone but replaceable
Glass Window Inserts
Superior optical clarity and acoustic performance. Ideal for permanent or semi-permanent installations.
- Noise reduction: 80-85%
- Cost: £350-500 per window
- Weight: Heavier, professional install recommended
- Durability: Scratch-resistant, long-lasting
Laminated Insert Panels
Premium solution with PVB interlayer for maximum sound dampening. Best acoustic performance.
- Noise reduction: 85-90%
- Cost: £450-650 per window
- Weight: Heavy, two-person installation
- Durability: Maximum performance and longevity
DIY Installation Guide
- Measure: Accurately measure window opening width and height
- Order: Purchase custom-sized insert with mounting system
- Clean: Thoroughly clean window frame and glass
- Install Seals: Apply compression tubing or magnetic strips to frame
- Insert Panel: Press insert firmly into place until fully sealed
- Test: Check for gaps and proper sealing around all edges
Pro Tip
For maximum noise reduction, ensure your existing window is properly sealed. Use weatherstripping on the original window before installing inserts to eliminate all sound leakage paths.
When to Choose Window Inserts
Window inserts are ideal when:
- You're renting and can't make permanent modifications
- Your budget is limited (£200-500 vs £800-1500 for replacement windows)
- You want seasonal noise protection (install in summer, remove in winter)
- You need a quick DIY solution without contractor involvement
- Your existing windows are in good condition and you want to preserve them



