If your home sits under a UK flight path, you've probably already worked out that standard double glazing isn't doing the job. Aircraft noise has a frequency profile that ordinary sealed units simply can't handle — and the 85-95 dB peaks during arrivals are loud enough to wake you, damage your concentration, and over years measurably increase cardiovascular risk. This guide explains what actually works, what doesn't, what the twelve UK airport noise insulation schemes cover in 2026, and where private installation makes more sense than waiting for a scheme.
What this guide covers
- Why aircraft noise behaves differently to traffic or rail noise — and why standard double glazing fails on it
- The measurable health and property-value impact of overhead noise
- How Rw, dB(A) and Rw+Ctr ratings translate to your actual living room
- Your five real glazing options compared, with honest dB-reduction figures
- Every UK airport noise insulation scheme — who runs it, what it pays, how to apply
- When the scheme route makes sense and when to install privately
- What the survey-to-installation process actually looks like
- Plain answers to the questions homeowners ask us most
Why aircraft noise is different
Aircraft noise is uniquely difficult for one reason: it spans both high and low frequencies in irregular peaks, where traffic and rail noise is more constant and frequency-banded.
A jet engine on an arrival approach generates dominant noise across roughly 200 Hz to 2,000 Hz, with peaks above and below. The low-frequency component (below 250 Hz) is the part you feel as much as hear — it makes window frames rattle, vibrates through walls, and is the part standard glazing handles worst. Glass blocks high-frequency sound through mass; it blocks low frequencies through mass combined with specific tuning of the air gap between panes. Most thermal-grade double glazing is tuned for energy efficiency, not for low-frequency acoustic performance.
Then there's the intermittency. A motorway near your house generates a near-constant 65-70 dB Leq daytime average — annoying, but the brain habituates over weeks. An aircraft arrival every 90 seconds at 85-95 dB peaks doesn't habituate the same way; each one re-triggers your stress response, particularly during sleep. The WHO 2018 environmental noise guidelines recommend night-time aircraft noise should remain below 40 dB Lnight outdoors for sleep protection; properties within 3 km of major UK airport flight paths regularly experience 55-60 dB Lnight.
Finally, the angles. Aircraft noise comes downward, often at 25-45° to your roof. Traffic noise comes horizontally, where window orientation matters. With overhead noise, the roof and upper walls matter as much as the windows — which is why most official scheme installations pair glazing upgrades with loft insulation and acoustic ceiling overboarding.
The health and property-value impact
Long-term exposure to aircraft noise correlates with measurable health outcomes that quieter areas don't see at the same rates. The HYENA study and subsequent work led by Imperial College researchers have found cardiovascular admission rates around Heathrow elevated for residents in the higher noise contour bands compared with control populations. The WHO 2018 review reached similar conclusions across European airports — the relationship between Lden exposure and hypertension, ischaemic heart disease, and sleep disturbance is now well-established in the public health literature.
Beyond the headline conditions, sleep is the constant issue. Each early-morning arrival pulse can move you up a sleep stage even if you don't consciously wake. Over months and years this accumulates as the kind of low-grade exhaustion residents in flight-path postcodes will recognise instantly when described.
Property values feel it too. Industry research consistently finds a measurable noise-discount on flight-path homes compared with otherwise-comparable properties further from the contour. Demonstrably effective acoustic glazing — with a written Rw certificate from the installer — partially closes that gap, and is one of the better-recouped home improvements you can do in a noise-affected area.
That said, most homeowners under flight paths who install acoustic glazing do it primarily for sleep, not for property value. The property-value angle is real but secondary. The daily quality-of-life difference is the thing customers actually call us about three months after installation.
Understanding the numbers — Rw, dB(A) and Rw+Ctr
Glazing performance ratings are confusing because there are three different decibel measures in play, each measuring something different.
Rw — Weighted Sound Reduction Index
Rw is the lab-tested rating of how much sound a glazing unit reduces, averaged across a standard frequency range. A unit rated Rw 38 dB reduces sound by ~38 decibels across that range on average. This is the headline number on glazing spec sheets. Standard 28 mm sealed-unit double glazing achieves Rw 28-32 dB. Acoustic double glazing with laminated PVB interlayers achieves Rw 38-42 dB. Premium acoustic triple glazing with asymmetric panes hits Rw 48-52 dB.
Rw+Ctr — spectrum-adapted for low-frequency noise
Rw+Ctr is Rw with a correction factor for noise dominated by low frequencies — road traffic, music, certain machinery, and crucially, aircraft on arrival approach. The Ctr figure is usually -3 to -7 dB. For aircraft noise, Ctr matters because low-frequency content is significant. A glazing unit with Rw 42 dB and Ctr -5 dB effectively delivers around 37 dB of real-world reduction against aircraft-style noise. If you're comparing acoustic glazing quotes, ask for the Rw+Ctr figure — not just the headline Rw.
dB(A) — what your sound meter would actually read
dB(A) is the measurement of actual environmental noise in real conditions, weighted to how the human ear perceives loudness. This is what you'd measure in your living room with a sound-level meter. The relationship between Rw and the dB(A) reduction you'll actually experience isn't 1:1 — it depends on the frequency profile of the noise source plus how well the rest of your room is sealed.
What this means practically: if your bedroom currently sits at 50 dB(A) average during night-time aircraft activity, installing Rw 42 dB acoustic glazing typically brings indoor levels down to 28-32 dB(A). That's the difference between "I can hear individual aircraft" and "occasional faint sounds during the busiest hour."
Decibels are logarithmic — every 10 dB reduction halves the perceived loudness to the human ear. Rw 42 dB acoustic versus Rw 28 dB standard isn't 1.5 times quieter, it's roughly four times quieter as your brain experiences it. Two practical rules: for aircraft noise specifically, prioritise the Rw+Ctr figure rather than the headline Rw; and a 10 dB reduction over what you currently have is the meaningful threshold — anything less and you'll struggle to perceive the difference.
Your five glazing options compared
Five real options exist for noise-affected properties. The right one depends on your starting point, your budget, and whether you have planning constraints like a listed building or conservation area.
Standard double glazing (Rw 28-32 dB)
This is what most replacement window quotes default to. It's the baseline thermal-performance product, not an acoustic solution. Replacing single glazing with standard double glazing gives a modest acoustic benefit — 10-15 dB improvement over single — but if you're already on standard double glazing and still hearing aircraft, upgrading to higher-spec standard double glazing won't fix the problem.
Acoustic double glazing (Rw 38-42 dB)
The most common middle-tier solution. The key technical difference is laminated PVB interlayers on at least one pane — typically the inner pane — which dampens vibration across the frequency range. Asymmetric pane thicknesses (a 4 mm outer plus a 6.4 mm laminated inner is a common build) prevent the resonance frequencies where both panes vibrate sympathetically. Acoustic double costs roughly 30-50% more than standard double glazing per unit, and is the most cost-effective single upgrade for aircraft-affected properties. For most flight-path homes, this is the right answer.
Secondary glazing (Rw 42-50 dB combined)
Secondary glazing is an internal frame added on the room side of your existing primary windows. Two air gaps work much better than one — the wider the gap (100 mm+ is ideal), the better the low-frequency performance. Secondary glazing is the standard solution for listed buildings and conservation areas where you can't change the external appearance. It's also frequently the cheapest way to hit Rw 45+ dB if your existing primary windows are reasonably airtight. See our secondary glazing service page for full specifications.
Acoustic triple glazing (Rw 44-48 dB)
Three panes with two air gaps and at least one laminated PVB interlayer. The triple-pane structure helps thermal performance (U-values around 0.8 W/m²K) but acoustically it's only marginally better than equivalent-spec acoustic double glazing — the second air gap helps low-frequency performance somewhat, but not as much as a wide secondary glazing gap would. Worth specifying when you want both thermal and acoustic improvements from the same installation.
Premium asymmetric acoustic triple (Rw 48-52 dB)
Three panes with different thicknesses (e.g. 6 mm + 4 mm + 8.8 mm laminated), wide cavities filled with argon, and laminated PVB on more than one pane. This is the highest practical specification for residential glazing. Above this you're into specialist commercial systems used for recording studios and hospital ICUs. Most homeowners overspecify here — Rw 42 dB acoustic double is sufficient for the great majority of UK flight-path properties.
Our typical recommendations
For properties on standard double glazing under flight paths, upgrading to acoustic double glazing is the cost-effective baseline. For listed buildings or conservation areas, secondary glazing is the only real option. For new-build properties or homeowners targeting near-Passivhaus thermal performance alongside acoustic, asymmetric acoustic triple makes sense. For severely affected properties within 2 km of an arrival approach, the combination of secondary glazing plus acoustic primary glazing hits Rw 50+ dB combined and is the highest performance achievable without commercial-grade systems.
Why thicker glass alone isn't enough
A common misconception: thick glass equals quiet windows. Glass mass does matter — the mass-spring-mass law of acoustic physics says heavier panels block more sound — but tuning matters more.
Two panes of identical thickness will resonate together at certain frequencies — what's called the coincidence frequency — where the unit becomes acoustically transparent at that specific frequency. With aircraft noise containing strong low-frequency components, hitting the coincidence frequency means a narrow noise band gets through almost unattenuated. This is why standard 4 mm+4 mm sealed units underperform their theoretical mass-blocking calculation.
The fix is asymmetric panes — combining different thicknesses (e.g. 6 mm outer + 4 mm inner) so the two panes resonate at different frequencies. Each pane covers what the other lets through. Add laminated PVB interlayers, and the polymer film dampens vibration further, particularly in the difficult 200-800 Hz range that contains most of the perceived aircraft loudness.
Frame seals matter as much as glass. A perfect Rw 48 dB sealed unit installed in a frame with worn rubber gaskets and 1 mm of air leakage performs like an Rw 28 dB unit in practice. This is why we renew all seals and use triple-gasket frame systems on every acoustic install — not just the glass.
Every UK airport noise insulation scheme in 2026
Twelve UK airports operate formal noise insulation schemes, with substantially varying generosity. Here's how they stack up as of May 2026. For full per-airport detail and eligibility maps, our airport noise schemes hub has a dedicated page on each.
Heathrow — Quieter Neighbourhoods Support — Residential Insulation Scheme
Heathrow's current scheme is the most generous in the UK — up to 100% of eligible insulation costs identified by their independent surveyor, with costs frequently exceeding £20,000 per home. Around 20,000 homes are eligible under the 2025-2028 phase-one rollout, covering parts of TW, UB, SL and KT postcodes within the composite noise boundary. Heathrow's appointed contractor is Kier Places — they handle survey and installation directly. S&K is not part of Heathrow's appointed-installer network; if you're inside the boundary, register direct via heathrow.com and Kier will contact you when your area opens. We install privately for properties outside the boundary or owners wanting upgrades beyond the scheme specification. Our blog post on the Heathrow noise insulation grant explains the application route in detail.
Gatwick — Noise Insulation Scheme
Gatwick's scheme provides up to £4,300 + VAT per eligible property towards acoustic double glazing for windows and external doors. Because the contribution is based on an industry-agreed price, the £4,300 typically delivers more glazing than the headline suggests. S&K Glazing is an officially appointed installer for the Gatwick scheme — we deliver funded works directly for properties in Surrey, Sussex and Kent within the 60 dBA noise contour. Top-up upgrades to premium acoustic triple beyond the scheme cap are available as a single combined project. For the dedicated route, see our Gatwick Noise Insulation Scheme landing page.
Manchester — Sound Insulation Grant Scheme (SIGS)
Manchester's SIGS has been running continuously since 1972 — the longest-established airport noise insulation programme in the UK. The current scheme operates under the 2024-2028 Noise Action Plan adopted by DEFRA in December 2024. Tiered grants apply to properties in Cheadle, Heald Green, Wythenshawe, Hale, Bramhall and surrounding SK and M postcodes nearest the airport. Delivered by MAG-appointed installers.
London Stansted — Sound Insulation Grant Scheme
Stansted's SIGS provides tiered grants by noise zone for residential properties in Uttlesford District and the Bishop's Stortford area. Zone D properties (69 dBA Leq or above) also qualify for relocation assistance. Works are phased with separate payment claims as each stage completes.
London Luton — Section 106 + DCO Expansion scheme
Luton's noise insulation programme was substantially enhanced after the April 2025 Development Consent Order approval. Five tiered schemes now apply: Scheme 1 (uncapped) for the noisiest 63 dB LAeq zone, Scheme 2 up to £20,000 for 60-63 dB LAeq, Scheme 4 up to £6,000 for 57-60 dB, and Scheme 5 up to £4,000 for 54-57 dB. Evander Glazing and Locks Ltd is Luton's appointed contractor under the Section 106 agreement.
Birmingham Airport — Sound Insulation Scheme (currently closed)
Birmingham's scheme covers properties within the 63 dB(A) noise contour but the current works programme is complete — every eligible property has been insulated. Birmingham Airport reviews the noise contours every two years; if the boundary expands, additional properties could become eligible. For now, private acoustic glazing is the alternative for BHX-area properties not previously covered.
East Midlands — Sound Insulation Grant Scheme
EMA's scheme is one of the most generous in the UK. Grants are zoned: Zone A £3,000, Zone B £5,000, Zone C £10,000, and Zone D where the airport will offer to purchase your home outright. The scheme reopened in April 2025 to residents whose original grant was awarded more than 20 years ago — meaning many homes near the airport can now re-apply for fresh funding.
Glasgow Airport — Noise Insulation Scheme
Glasgow's scheme provides up to £5,000 inclusive of VAT per eligible property. Glasgow uses a more generous 60 dB LAeq threshold than the UK Government's 63 dB recommendation, which means more households qualify. Contours are updated annually using the previous summer's flight data.
Edinburgh Airport — Noise Insulation Scheme
Edinburgh's scheme provides 50% cost contribution towards new double glazing and loft insulation for properties within the 63 dB+ noise contour. Single-glazed properties can apply for 50% of the cost of installing new double-glazed units. Contour mapping is updated bi-annually.
Bristol Airport — Noise Mitigation Grants
Bristol's scheme runs on an annual cycle. External acoustic consultants compile a list of eligible properties each year based on the previous summer's flight programme. 2026 application details are published in early 2026 — see Bristol Airport's interactive eligibility map for current-year contours.
London City Airport — Sound Insulation Scheme (three-tier)
LCY's scheme operates three tiers covering East London — Newham, Greenwich, Barking, parts of Tower Hamlets — based on a 57 dB LAeq,16h contour. Properties built after 27 April 2016 are excluded (those planning permissions should already have required equivalent acoustic standards as a planning condition).
Aberdeen Airport — Noise Insulation Scheme
Aberdeen's NIS provides up to £5,000 inclusive of VAT per eligible property for habitable rooms. The scheme is managed by the Aberdeen Airport Consultative Committee — an independent body of airport managers and local community representatives — with eligibility based on annually-updated noise contours.
Scheme installation versus private install
Most homeowners under flight paths default-assume the scheme route is best because it's funded. That's right around 70% of the time — but not always.
The scheme route makes sense when: your property is comfortably within the published noise contour boundary; the scheme's standard specification (typically Rw 38-40 dB acoustic double glazing) is sufficient for your noise level; and you're not in a rush — most schemes run on 6-18 month lead times between application and installation.
Private installation makes sense when: your property is just outside the contour boundary (your aircraft noise problem is real, but you don't qualify); you want a higher specification than the scheme funds (premium acoustic triple, wide-gap secondary glazing); you have a listed building or conservation property the scheme can't accommodate; you have commercial premises the scheme doesn't cover; or you need it done in weeks rather than months.
A common pattern: a homeowner inside the Gatwick scheme boundary wants premium triple glazing (Rw 50+ dB). They apply for the scheme, receive their £4,300 + VAT allocation, then commission us to deliver the full premium installation at the higher specification. The funded portion covers what would have been a standard scheme install; the homeowner pays the top-up. One installer, one site visit, one warranty — this works particularly well at Gatwick where we're the official scheme installer. For other airports, the appointed contractor delivers the funded works first and we install privately as a separate project if upgrades are wanted afterwards.
The survey and installation process
Every project starts with a free acoustic survey at your property — usually within 5-10 working days of your initial enquiry. The surveyor takes acoustic measurements at each window position using a calibrated sound-level meter, identifies the dominant frequency profile of your local noise (aircraft, traffic, rail, or a mix), photographs the existing frames and seals, and measures the window apertures.
You receive a written proposal within 3-5 working days. The proposal specifies the recommended glazing build-up per window (which can legitimately vary across the property — bedrooms often get higher Rw than utility rooms), expected dB reduction at each location, frame and seal specifications, and a fixed price.
Manufacturing happens at our facility in Great Barr, Birmingham. Typical lead times: 4-6 weeks for standard acoustic double glazing, 6-8 weeks for acoustic triple, and 8-10 weeks for bespoke heritage or large-format units. We don't subcontract glass manufacture — units are built in-house, which is how we maintain quality control on the laminated PVB lay-ups that are the difference between Rw 38 dB and Rw 32 dB real-world performance.
Installation usually takes 1-3 days for a typical three-bedroom property. Each old unit is removed, the frame seals and gaskets renewed, the new acoustic unit installed and properly sealed, and the frame trim refitted. We provide an acoustic certification document on completion showing the achieved Rw rating per window — useful for property records, mortgage applications, conveyancing surveys, and noise mitigation grant claims. The 10-year insurance-backed warranty covers both the units and the installation.
Frequently asked questions
Next steps
If you're affected by aircraft noise and considering acoustic glazing — whether through one of the UK airport schemes or privately — three pieces of information help us help you faster:
- Your postcode and approximate distance from the nearest major airport — this tells us immediately whether you're inside a scheme boundary
- Your current windows — single-glazed, standard double, or already acoustic? This determines the cost-effective upgrade path
- Your primary motivation — sleep, property value, planning consent for a heritage property, or commercial premises each have different right-spec answers
Call us on 0800 088 6341 for a free acoustic survey and quote. For more detail on the specific service, see our acoustic glazing and acoustic glazing for flight paths service pages. For airport-specific scheme details and how we fit alongside each one, the airport noise schemes hub is your starting point.
Need help with your glazing project? S&K Glazing offers free surveys and fixed-price quotes across the UK. Call 0800 088 6341, message us on WhatsApp at 07830 175306, or request a quote online.