Aircraft noise is the most location-specific of the big three noise exposures: streets a mile apart can sit inside and outside a departure route, and the difference is not subtle. Before buying anywhere near an airport, check the noise contours for the address, the night-flight regime, and — the one buyers always miss — whether the airport has expansion or flight-path changes on the table.
Unlike road and rail, aircraft noise comes with a paper trail of public contours, consultation documents and, around the biggest airports, funded insulation schemes. Ten minutes of checking tells you more than ten viewings.
Reading the noise contours
Aircraft noise is mapped as contours — bands of average exposure (Lden, with 51–54 dB commonly treated as the onset of significant community annoyance in UK policy) plus night-specific measures. DEFRA’s strategic maps include an aircraft layer, and major airports publish their own, more detailed contour reports annually. A Housometer report includes the modelled aircraft noise band, day and night, for any address.
Contours are averages, and averages hide patterns that matter: runway alternation (some airports switch approach directions to share the burden — your quiet week may be someone else’s loud one), seasonal and weather-driven variation in which routes are used, and concentration of departures over narrow corridors following navigation upgrades.
- Check the address against the airport’s published contours AND DEFRA’s aircraft layer.
- Ask which runway/approach pattern affects the street and whether alternation applies.
- Check the night-flight regime: some airports have movement caps or curfews, others do not.
- Visit on a day the live arrivals app shows the relevant runway in use — flight-tracking sites make this trivial.
Sources: Extrium — DEFRA England noise map viewer (aircraft layer) · CAA — aircraft noise information
Night flights, insulation schemes and expansion risk
Night noise is where flight paths bite hardest, and regimes differ sharply by airport — from strict movement caps to effectively unrestricted freight operations. Check the specific airport’s current night rules rather than assuming; they are public and periodically reviewed.
Around the largest airports, homes inside defined contours often qualify for funded sound-insulation schemes — acoustic glazing, ventilation, sometimes loft insulation, paid for or subsidised by the airport. If the home you’re viewing qualifies, ask whether the work has been done (and inherit it), or whether the entitlement remains available.
Finally, the risk nobody prices: change. Runway expansions, airspace modernisation and route concentration can move noise onto — or off — a street that was previously fine. Search the airport’s current consultations before you offer; the documents are public, and "we didn’t know" is expensive.
What flight paths do to value
UK evidence consistently shows homes inside significant aircraft-noise contours price at a discount that grows with the exposure band — modest at the contour edge, substantial directly under a busy approach. As with roads and rail, the discount persists on resale, so the test is whether today’s price fully reflects today’s (and plausibly tomorrow’s) exposure.
The £/m² comparison against similar homes outside the contour is the cleanest evidence — and if you’re negotiating on a home under a path, the contour map itself is a document the agent cannot argue with.