Finding the "Noise Leaks" in Period Sash Windows
If you live in a period property or a listed building, your windows are beautiful — but they are also acoustic sieves. Even if you have thick curtains, noise behaves like water: if there is a hole, it will pour through.
During a sound survey, we look for "noise leaks." In traditional sash windows, these are usually found:
- Between the sashes— where the top and bottom windows meet.
- In the pulley stiles— where the weights live.
- At the meeting rail— if the wood has warped over the last 100 years.
A professional survey identifies exactly where the sound is flanking around your existing windows. This allows us to design a secondary glazing system that doesn't just "add glass," but creates an airtight acoustic seal using twin-compression seals — ensuring the 54dB noise reduction we promise is actually achieved in reality.
Data-Driven Solutions: Why 10.8mm Glass Matters
Once we have the data from the survey, we don't guess. We use the science of acoustics to recommend a solution.
If your survey shows a high level of low-frequency rumble from a nearby bus route, standard 4mm or 6mm glass won't cut it. You need mass. This is where our 10.8mm acoustic laminate comes into play. It is significantly heavier and denser than standard glass, providing the "inertia" needed to stop sound waves from vibrating through the pane.
Furthermore, the survey helps us determine the optimum air cavity. To get the best results, you need a gap of 100–150mm between your existing window and the secondary glazing. This air gap acts as a "buffer zone" where sound waves lose energy before hitting the second barrier. Without a professional survey, you might install the glazing too close to the original window, "coupling" the two panes and actually making the noise worse at certain frequencies.
The "Sanctuary" Benefit: More Than Just Numbers
We talk a lot about decibels and glass thickness, but the real goal of a sound survey is your quality of life.
Living in a high-decibel environment is scientifically proven to increase cortisol (stress) levels, disrupt sleep cycles, and even impact cardiovascular health. When we provide a soundproofing solution, we aren't just selling a home improvement product — we are selling a "Sanctuary."
Imagine sitting in your living room in the middle of Kensington or Camden. Outside, the world is chaotic. But inside, you can hear yourself think. You can hear the subtle notes of your music. You can sleep through the night without being jolted awake at 5:00 AM by the first bus of the morning. That peace of mind starts with a survey.
Why Guess When You Can Know?
Buying secondary glazing without a sound survey is like buying glasses without an eye test. You might get lucky, but you'll probably end up with something that doesn't quite fit your needs.
Certainty
You'll know exactly how much noise reduction is possible.
Accuracy
You'll get the right glass — like our 10.8mm acoustic laminate — for your specific noise profile.
Savings
You won't over-invest in features you don't need, or under-invest in the ones you do.
Our team are experts in the unique acoustic challenges of London's period homes. We don't just "fit windows" — we engineer silence. If you are tired of the noise and ready to take the first scientific step toward a quieter life, it's time to move past the phone apps and talk to the pros.