Road Noise: Your Options

If road noise is bothering you at home, the honest ranking of fixes is: windows first, room layout second, everything else a distant third. Upgraded glazing is the only intervention that reliably transforms how a room sounds; most garden products sold as noise barriers do almost nothing. This guide goes through the ladder from free to expensive, with realistic numbers, so you can spend once and spend right.

First, know your enemy: check your postcodeto see the modelled noise band (DEFRA's Strategic Noise Mapping Round 4, 2022). A home in the 55–59.9 dB band has a different set of sensible options from one at 70 dB+, and if your road isn't mapped at all the noise may be local traffic the official model doesn't cover.

Free and cheap: layout and sealing

Swap bedrooms. Moving your bedroom to the back of the house is often worth more than a four-figure glazing upgrade for the front. Roughly speaking, the quiet side of a building can be 10 dB or more lower than the exposed façade — about half as loud. It costs a weekend.
Seal the gaps. Sound follows air. Acoustic sealant around window frames, brush strips on doors, sealed letterboxes and blocked-off disused vents each claw back a little; together they can make a noticeable difference, for tens of pounds.
Add soft mass inside.Heavy lined curtains (closed), bookcases against the party-facing wall, rugs on hard floors. This tames the room's acoustics and takes the edge off — think of it as a couple of dB and a less harsh sound, not a cure.

The big one: windows

Almost all traffic noise enters through glazing, because glass is the lightest part of the building envelope. Your realistic options:

Secondary glazing — an independent second pane fitted inside the existing window, with a large air gap. For noise this typically beats replacement double glazing, because the gap is what kills sound transmission. Expect roughly £300–600 per windowfor decent systems (more for large or shaped windows), and a reduction that most suppliers quote at 10–15 dB over single glazing — enough to roughly halve perceived loudness. It's also usually the only option for listed buildings and conservation areas.
Acoustic double/triple glazing — replacement units with asymmetric panes and an acoustic laminated layer. Costs more than standard double glazing (often £700–1,200+ per window fitted) and performs a few dB better; the laminated layer particularly helps with the low-frequency rumble of heavy traffic. Worth specifying if the windows need replacing anyway — the uplift over standard units is modest money at that point.
Both — secondary glazing over decent double glazing is what acousticians fit on genuinely loud roads (65 dB+ bands). It is the closest thing to switching the road off, short of moving.

One rule: fix the whole room or don't bother. A single upgraded window next to an untouched one performs like the untouched one — sound takes the easiest path.

The ventilation trade-off nobody mentions

Sealed acoustic windows only work shut, and a bedroom you can't ventilate is a different problem. If you're investing in glazing, budget for ventilation at the same time: acoustic trickle vents (baffled so air passes but noise is attenuated) are the cheap answer; mechanical ventilation with heat recovery (MVHR) or single-room fresh-air units are the thorough one, letting you sleep in fresh air with the windows permanently shut. New homes near busy roads are designed this way under BS 8233; retrofits should copy it.

Gardens, fences and managed expectations

Here is where marketing outruns physics. A standard 1.8 m timber fence does very little — sound diffracts straight over it. For a barrier to work it needs mass (a solid wall or close-boarded acoustic fence with no gaps), height, and to sit close to either the source or the listener. Even a well-built garden barrier typically manages ~5 dB in the shadow zone behind it, less further back — noticeable, not transformative. "Acoustic" hedges and plants are pleasant screening for the eyes; the measured effect on traffic noise is close to nil.

If you have depth to play with, distance and ground absorption do more than any product: every doubling of distance from the road buys roughly 3–4 dB over soft ground. Position seating areas behind the house — use the building itself as your barrier. It's the same trick as the bedroom swap, outdoors.

Can I make the council or National Highways fix it?

Sometimes — on a timescale of years, so treat it as a parallel track, not the plan. Under the Environmental Noise (England) Regulations 2006, DEFRA's noise action plans identify Important Areas — the worst-affected locations on the strategic map — where the highway authority is expected to investigate mitigation such as quieter (low-noise) road surfacing or barriers. If your postcodesits in a high band, it's worth asking your council's environmental health team and (for motorways and major A-roads) National Highways whether you fall in an Important Area and when the road is next due resurfacing — resurfacing with a quieter material can shave several dB at zero cost to you.

For noise from an individual vehicle-related source that isn't traffic itself (an idling depot, say), the council's statutory nuisance powers under the Environmental Protection Act 1990 may apply. General traffic noise is not a statutory nuisance, so complaints route through the action-plan machinery above instead.

When moving is the honest answer

If you're at 70 dB+, everything above helps indoors but your garden, your open windows in summer and the approach to your front door stay loud. Some people acclimatise; some never do, and chronic night-time noise has real sleep and health costs. If two years of reasonable mitigation hasn't made the house liveable for you, price the remaining options against moving — and this time check the noise before you buy.

What to do now

Look up your postcode's modelled bandso you know what you're mitigating against.
Swap the bedroom and seal the gaps this weekend — it's free to try.
Get two or three quotes for secondary glazing on the exposed rooms (we're building a vetted-installer matching service — leave your email on any result page and we'll be in touch when it launches).
Ask your council whether your stretch of road is a DEFRA Important Area and when it's next due resurfacing.