Acoustic Glazing: How Surrey Homes Near Heathrow and Gatwick Get Quieter

If early flights wake you before your alarm, acoustic glazing could be the most useful upgrade you make in 2026. It uses special laminated glass to damp sound. Often, it also fits the frames you already have. So you get a quieter home without the cost and mess of new windows.

The timing is good, too, because Heathrow’s new insulation scheme runs its first phase from 2025 to 2028. Gatwick also runs a scheme of its own. Meanwhile, homes beside the M25, M3 and A3 deal with road noise that airport schemes don’t cover.

So this guide explains how acoustic glass works, what the ratings mean and which option suits your home. We are repair-only specialists, so we fit acoustic laminated sealed units into existing frames. However, we don’t sell new windows or install secondary glazing.

In this guide:

• What acoustic glass is and how it blocks sound.
• Rw ratings explained, with a side-by-side table.
• Why triple glazing is not the best fix for noise.
• The Heathrow and Gatwick insulation schemes.
• How to upgrade the glass in your existing frames.
• Cheap fixes for gaps, seals and gaskets.
• When secondary glazing is the better choice.

What Is Acoustic Glazing?

Acoustic glazing is double glazing built to cut noise rather than just heat loss. The secret lies in the glass itself. Specifically, each acoustic laminated pane sandwiches a soft plastic layer, called PVB, between two thin sheets of glass.

That plastic layer soaks up vibration before it reaches the room. According to Expertsure’s soundproof windows guide, it damps mid-range frequencies of roughly 250–4,000 Hz. That band covers traffic noise, voices and aircraft approach noise, so it suits busy roads and flight paths alike.

Why the two panes differ in thickness

Good acoustic units also use panes of different thickness, such as 6 mm outside and 4 mm inside. That matters because two identical panes resonate at the same frequency, so performance dips at that point. Different thicknesses, however, break up that weak spot, so less noise gets through.

For example, a typical build pairs 6.4 mm and 8.8 mm laminated panes either side of a 12 mm gap. Expertsure rates that kind of unit at about Rw 37–41 dB, so it clearly outperforms standard units. In addition, the build adds up to roughly 27 mm, which is close to a standard 28 mm unit.

Rw Ratings: How Much Quieter Is Acoustic Glazing?

Generally, glass makers measure sound insulation with a figure called Rw, the weighted sound reduction index. Since it comes from lab tests, it shows how much sound the glass alone blocks, in decibels. So the higher the number, the quieter the room.

Because decibels work on a logarithmic scale, even a few extra points matter. Still, remember that the frame, the seals and the fitting all affect the final result at home.

Glazing type	Typical build	Sound insulation (Rw)	Best for
Standard double	4 mm glass, 16 mm gap, 4 mm glass	About 31 dB	Everyday use
Enhanced double	6 mm and 4 mm panes	About 32–35 dB	Light traffic noise
Standard triple	Three panes, narrow gaps	About 35 dB	Heat loss more than noise
Acoustic laminated double	6.4 mm laminate, 12 mm gap, 8.8 mm laminate	About 37–41 dB	Flight paths and busy roads
Secondary glazing	Extra inner window, 100–200 mm gap	About 40–50 dB	The loudest spots and period homes

In short, acoustic laminated units beat standard triple glazing on noise, while secondary glazing with a wide gap scores highest here. However, secondary glazing means a second window inside each room, so it is not for everyone.

Why Triple Glazing Is Not the Best Fix for Noise

Many people assume that three panes must block more sound than two. In practice, however, standard triple glazing reaches only about Rw 35 dB. Expertsure explains this is because the narrow gaps between three panes cancel out much of the extra glass’s benefit.

Triple units are also much thicker, at roughly 36–44 mm, so many existing frames cannot take them. As a result, a switch to triple glazing often means new windows, which costs far more. So for noise alone, acoustic laminated double glazing is usually the smarter buy.

Low rumble needs mass

Deep sounds behave differently from voices or birdsong. For example, Expertsure notes that low-frequency traffic rumble, in the 63–500 Hz band, needs mass to block it. That is why heavier laminated glass, or secondary glazing with a big gap, beats standard double glazing against rumble.

Aircraft Noise in Surrey: Heathrow and Gatwick Schemes

North-west Surrey sits right beside Heathrow, while Horley lies next to Gatwick. As a result, aircraft noise is part of daily life in several Surrey towns. Both airports run insulation schemes, so check them before you spend your own money.

Heathrow’s Residential Insulation Scheme

Heathrow runs a Residential Insulation Scheme for homes inside its noise boundary. According to Heathrow’s scheme FAQs, it can fund up to 100% of eligible costs on a like-for-like basis. That can include replacement windows or secondary glazing and external doors, as well as acoustically rated ventilation and loft insulation.

Phase one runs from 2025 to 2028, so now is a good time to check. To see if you qualify, use the postcode checker on Heathrow’s website, then register your interest. Listed homes can qualify too, although any planning costs stay with the owner.

If you live close to the airport, see our pages on glazing repairs in Stanwell and window repairs in Ashford, Surrey. We also cover double glazing repairs in Staines and sealed unit repairs in Egham.

Gatwick’s Noise Insulation Scheme

Gatwick, meanwhile, runs a Noise Insulation Scheme for eligible homes across Surrey, Sussex and Kent. Its page on reducing aircraft noise says affected homes can apply for up to £4,300 plus VAT towards double glazing. This covers windows and doors, although the scheme does not offer secondary glazing for doors. The core boundary follows a 60 dBA noise contour, and an interactive map shows whether your home qualifies.

Horley sits right beside the airport, so many homes there rely on good seals to keep aircraft sound out. If you live there, see our page on window and door repairs in Horley. As with Heathrow, check the scheme first, because rules and boundaries can change.

We are not part of either scheme

To be clear, we are not part of the Heathrow or Gatwick schemes. However, many homes sit outside the boundaries, while others have older glazing that has since worn out. The same goes for road noise, since neither airport covers it. In all those cases, we can still repair what you have or upgrade the glass at a fixed written price.

Acoustic Glazing in Your Existing Frames

Here is the 2026 trend worth knowing about. If your frames are still sound, you can often keep them and swap only the sealed units for acoustic ones. Because you only replace the glass, it usually costs less than new windows, and there is far less mess.

Also, you don’t need building regulations approval when you only replace the glass in an existing frame. So the job stays simple, quick and tidy.

How we upgrade to acoustic glass

1. Free survey: we measure each unit and also check the depth of the frame rebate.
2. Honest advice: then we tell you which rooms will gain most, and whether each frame can take an acoustic unit.
3. Fixed written price: you get the full cost in writing before work starts, with no hidden call-out fees.
4. Made to size: we order the acoustic laminated units, then return for a short second visit to fit them.
5. Final adjustment: finally, we reset hinges, keeps and gaskets so every sash closes tight.

In general, uPVC frames take a unit of a set depth, often 24 mm or 28 mm. Acoustic units can suit many of these frames, although a deep laminated build may need a thicker rebate. If your frame cannot take one, we will tell you straight away.

As a guide, our typical sealed unit replacement costs around £80–£150, while a complete new window costs around £400–£800. Acoustic laminated units cost more than standard ones, so we confirm the exact price after the free survey. By comparison, Expertsure puts acoustic laminated double glazing at £600–£1,000 per casement window, installed.

If you also want lower heating bills, read our guide to upgrading the glass units in existing frames. It also explains low-E glass, gas fills and warm-edge spacers.

Which rooms to tackle first

Start where the noise hurts most. For most people, that means bedrooms that face the flight path or the road, especially at night. Next, look at a home office or the living room, and then the front door. As a result, you spend your budget where you will notice it every day.

Seals, Gaps and Gaskets: The Cheapest Way to Cut Noise

Sound travels through air, so even a small gap can undo good glass. In fact, Expertsure notes that a 1% unsealed gap in a secondary glazing panel can cut its performance by up to 10 dB. The same logic, then, applies to any window or door that no longer closes tight.

Before you spend on new glass, check these common weak spots:

• Shrunken gaskets: rubber seals harden and shrink with age, so gaps open up around the glass.
• Dropped sashes: when a hinge wears, the window no longer pulls tight against its seals.
• Worn keeps and handles: if the locking points don’t grip, the sash sits slightly open.
• Dropped doors: a sagging uPVC door lets in sound as well as cold air.
• Trickle vents: they bring in fresh air but also some sound, so ask about acoustic vents rather than blocking them.

These are exactly the faults we specialise in. We replace worn gaskets and seals, adjust or renew hinges, and realign doors so they close firmly again. Most of these repairs take a single visit, and they can make a real difference to both noise and draughts. Also, find out more about our window repair service across Surrey.

Secondary Glazing vs Acoustic Glazing: Which Is Quieter?

Secondary glazing adds a second window on the inside of the existing one. With a gap of 100–200 mm, it reaches about Rw 40–50 dB, so it scores highest in our table. It also leaves the original window untouched, so it often suits listed and period homes.

However, it changes how you open and clean your windows, and it takes up a little space. We don’t install secondary glazing, but we can advise you and point you to a specialist. Also, the main window still needs good seals, because both layers must close tight to work well.

For older houses, also see our guide to slim and vacuum options for period sash windows.

A simple rule of thumb

• Moderate noise and sound frames: fit acoustic laminated units, so you keep your existing frames.
• Severe noise or a listed home: choose secondary glazing, but repair your main windows too.
• Noise mainly through gaps: fix the seals, hinges and keeps first, because that costs least.
• Inside a scheme boundary: check what Heathrow or Gatwick will fund before anything else.

Acoustic Glazing FAQs

Does acoustic glazing block aircraft noise completely?

No glazing blocks noise completely, but acoustic laminated units make a clear difference. For example, Expertsure rates them at about Rw 37–41 dB, against about 31 dB for standard double glazing. For the loudest spots, however, secondary glazing with a wide gap does even better.

Can acoustic glazing go into my existing uPVC frames?

In many cases it can, as long as the frame rebate suits the laminated unit. So we check this at the free survey. If the frame cannot take it, we’ll tell you honestly and suggest another route.

Is acoustic glazing better than triple glazing for noise?

Acoustic laminated double glazing usually beats standard triple glazing on noise. That is because the narrow gaps in triple glazing limit its benefit, so it reaches only about Rw 35 dB. Triple glazing makes more sense when heat loss is your main concern.

Will Heathrow or Gatwick pay for acoustic glazing?

They may help if your home sits inside their scheme boundaries. Heathrow can fund up to 100% of eligible costs, while Gatwick offers up to £4,300 plus VAT towards double glazing. So check eligibility on their websites before you pay for anything.

Do you fit secondary glazing or new windows?

We don’t, because we are repair-only specialists. Instead, we fit acoustic laminated sealed units into existing frames and repair seals, hinges and locks. If you want secondary glazing, we can advise you and point you to a specialist.

How long does an acoustic glass upgrade take?

It usually takes two short visits, because we order each unit to measure. First, we survey your windows and measure each one. Then, once the new units arrive, we come back to fit them and adjust each sash.

Key Takeaways

• Acoustic laminated units reach about Rw 37–41 dB, compared to about 31 dB for standard double glazing.
• Triple glazing is not the best choice for noise alone, because its narrow gaps limit the benefit.
• Secondary glazing with a 100–200 mm gap scores higher still, at about Rw 40–50 dB.
• Check the Heathrow and Gatwick schemes before you pay for noise work yourself.
• Worn seals and dropped sashes let noise in, so fix them first.