post-2000
Secondary Glazing for New Builds with Noise Issues
If you own a new builds with noise issues, the window problem is nearly always the same: double glazing that still lets noise through. Modern double glazing was designed for thermal performance, not acoustic performance — which is why so many new-build owners are still kept awake by main-road traffic.
Why new builds with noise issues owners choose secondary glazing
The typical spec is 6.8 mm laminated glass with a 100 mm cavity — Rw improvement of 8–12 dB over the double-glazed unit alone.
Because the original unit stays put, new-build warranties on the primary window aren't affected.
A secondary pane installed room-side of a modern double-glazed unit adds the acoustic mismatch and cavity depth the original unit lacks.
Recommended: Soundproofing
cut outside noise by up to 80%
45–54 dB reduction with a 100–150 mm cavity
The acoustic gain comes from air-gap decoupling — a 100 mm cavity between the existing pane and the secondary pane detunes the resonant frequencies that carry traffic noise into a room.
Recent installs nearby
Lakeside new-build train-line retrofit
East Coast Main Line rumble reduced by 12 dB with 6.8 mm laminated sliders behind modern PVCu.
Nether Edge Grade II sash retrofit
Six original box sashes fitted with balanced vertical secondary sliders — full listed-building consent secured in six weeks.
Ecclesall Road bay-window sound retrofit
Three-panel horizontal sliders across a 3.2 m Edwardian bay — Rw measured at 47 dB post-install.
Local reference points
- Era
- post-2000
- Typical window
- modern PVCu or aluminium double glazing
- Top problem
- double glazing that still lets noise through
- Recommended service
- Soundproofing
- Recommended product
- horizontal sliders
- Performance
- 45–54 dB reduction with a 100–150 mm cavity
Book an on-site survey
We measure and template every opening — no per-square-metre guesswork.
Common questions
Is it worth it on a modern double-glazed window?
For noise, yes — modern DG units were designed for thermal not acoustic performance, and a laminated secondary pane adds the acoustic mismatch they lack.
How much noise reduction can I realistically expect?
With a 100 mm cavity and 6.4 mm laminated secondary glass we routinely measure 40–47 dB Rw — enough to drop main-road traffic to a soft background hum.
Can I still open the original window?
Yes — every sliding, hinged and lift-out unit is designed to move clear so you can operate the primary window behind it.
Can Low-E glass be combined with acoustic laminated?
Yes — most heavy specifications combine both, so you get acoustic gain and thermal gain in the same install.
Do you install in flats and communal buildings?
Yes — the install is entirely inside your flat, so freeholder consent is usually straightforward and window-cleaner access to the primary window is unaffected.
Next step for new builds with noise issues owners
Send us photos of one or two windows and we'll come back with a written quote and a spec sheet you can compare against replacement double glazing.