Road & rail noise map for Holt
Town in Norfolk, Eastern
We analysed 360 postcodes in and around Holt, Norfolk against DEFRA's Strategic Noise Mapping (Round 4, 2022). 28% of them (99) have mapped road noise of 55 dB or more by day, and 0% have mapped rail noise. 73% 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 NR24 2AL (road noise 65.0–69.9 dB by day).
Noise map of Holt
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 | 20% (73) | 4% (16) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 7% (25) | 4% (15) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | <1% (1) | 0% (0) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | 0% (0) | 0% (0) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 73% | 91% |
Rail noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | 0% (0) | 0% (0) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 0% (0) | 0% (0) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 0% (0) | 0% (0) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | 0% (0) | 0% (0) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 100% | 100% |
Share of the 360 postcodes within ~5 km of the Holt centre. Source: DEFRA Strategic Noise Mapping Round 4 (2022), Open Government Licence.
Noisiest postcodes in and around Holt
Check a specific postcode
Example searches: NR24 2AL · NR25 6AT · NR24 2RU · NR24 2RP · NR24 2RL · NR25 6BJ
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.
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Nearby areas
Frequently asked questions
- How noisy is Holt?
- We analysed 360 postcodes in and around Holt, Norfolk against DEFRA's Strategic Noise Mapping (Round 4, 2022). 28% of them (99) have mapped road noise of 55 dB or more by day, and 0% have mapped rail noise. 73% 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 NR24 2AL (road noise 65.0–69.9 dB by day).
- Where is the most road noise in Holt?
- The postcodes with the highest modelled daytime levels in and around Holt are NR24 2AL, NR25 7QB, NR25 7YB, based on DEFRA's 2022 model of major roads and railways.