Road & rail noise map for City of Westminster
City in Greater London, London
We analysed 10,722 postcodes in and around City of Westminster, Greater London against DEFRA's Strategic Noise Mapping (Round 4, 2022). 50% of them (5,400) have mapped road noise of 55 dB or more by day, and 11% have mapped rail noise. 46% of postcodes have no mapped road or rail noise at all — though that reflects major-source modelling, not guaranteed quiet. The highest modelled level we found is at SW9 8BH (road noise 75.0 dB or more by day).
Noise map of City of Westminster
How many postcodes are affected?
Road noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | 22% (2,321) | 9% (998) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 11% (1,128) | 9% (943) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 10% (1,067) | 9% (981) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | 7% (738) | 5% (541) |
| 75.0 dB or more day · 70.0 dB or more night | 1% (146) | <1% (83) |
| Below mapped bands / not mapped | 50% | 67% |
Rail noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | 4% (390) | 4% (412) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 4% (376) | 3% (366) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 3% (335) | 3% (310) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | <1% (106) | <1% (102) |
| 75.0 dB or more day · 70.0 dB or more night | <1% (12) | <1% (9) |
| Below mapped bands / not mapped | 89% | 89% |
Share of the 10,722 postcodes within ~5 km of the City of Westminster centre. Source: DEFRA Strategic Noise Mapping Round 4 (2022), Open Government Licence.
Noisiest postcodes in and around City of Westminster
Check a specific postcode
Example searches: SE11 5JA · SE1 6FE · SE11 4RG · SE11 4RX · SE11 5QY · SE1 6HS
What this data does — and doesn't — cover
- Modelled, not measured.These are DEFRA's computer-modelled estimates (Round 4, 2022), not microphone readings at your door.
- Major sources only. The model covers major roads, major railways and large urban areas. Smaller local roads, neighbours, pubs, building sites and aircraft are not included.
- No mapped noise ≠ quiet. If a location shows no band, it means it falls outside the mapped contours — not that it is silent.
- 2022 snapshot.New roads, developments or traffic changes since 2022 won't show. The next DEFRA round is due around 2027.
More detail on the methodology page.
Bothered by road or rail noise at home?
Acoustic and secondary glazing typically cuts perceived traffic noise dramatically. We're building a free quote-matching service with vetted installers — leave your email and we'll contact you when it launches.
Nearby areas
Frequently asked questions
- How noisy is City of Westminster?
- We analysed 10,722 postcodes in and around City of Westminster, Greater London against DEFRA's Strategic Noise Mapping (Round 4, 2022). 50% of them (5,400) have mapped road noise of 55 dB or more by day, and 11% have mapped rail noise. 46% of postcodes have no mapped road or rail noise at all — though that reflects major-source modelling, not guaranteed quiet. The highest modelled level we found is at SW9 8BH (road noise 75.0 dB or more by day).
- Where is the most road noise in City of Westminster?
- The postcodes with the highest modelled daytime levels in and around City of Westminster are SW9 8BH, SW9 7DE, SE1 8XE, based on DEFRA's 2022 model of major roads and railways.